CN102164255A - CATV entry adapter and method for preventing interference with eMTA equipment from MoCA signals - Google Patents

CATV entry adapter and method for preventing interference with eMTA equipment from MoCA signals Download PDF

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Publication number
CN102164255A
CN102164255A CN2011100370861A CN201110037086A CN102164255A CN 102164255 A CN102164255 A CN 102164255A CN 2011100370861 A CN2011100370861 A CN 2011100370861A CN 201110037086 A CN201110037086 A CN 201110037086A CN 102164255 A CN102164255 A CN 102164255A
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China
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signal
moca
catv
adapter
couple
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CN2011100370861A
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Chinese (zh)
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C·T·威尔斯
J·M·小埃根
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PPC Broadband Inc
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PPC Broadband Inc
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Priority claimed from US12/691,149 external-priority patent/US8510782B2/en
Application filed by PPC Broadband Inc filed Critical PPC Broadband Inc
Publication of CN102164255A publication Critical patent/CN102164255A/en
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Abstract

A community access or cable television (CATV) entry adapter interfaces to a CATV network and serves as a hub in a Multimedia over Coax Alliance (MoCA) network. MoCA signals communicated between active ports of the entry adapter are rejected by MoCA frequency rejection filters to avoid interfering with the functionality of an eMTA subscriber device connected to a passive port of the entry adapter, without interfering with the passage of CATV upstream and downstream active and passive signals.

Description

CATV couple in adapter and be used to prevent the method for MoCA signal to the interference of eMTA equipment
The cross reference of related application
The application is the part continuation application by identical inventor invention of description in the U.S. Patent Application Serial Number of submitting on October 21st, 2,008 12/255,008 that is entitled as " Multi-Port Entry Adapter; Hub and Method for Interfacing a CATVNetwork and a MoCA Network " of this paper.The invention of describing in the U.S. Patent Application Serial Number 12/255,008 is transferred to assignee of the present invention.
Technical field
The present invention relates to that community inserts or cable television (cable television, CATV) network and relate to coaxial cable multimedia alliance (MoCA) (in-home) entertainment network of being in.More specifically, the present invention relates to a kind of new and improved CATV couple in adapter (entryadapter), it is in conduction CATV downstream and stream signal between subscriber device that is connected to couple in adapter and the catv network and be connected to conduction MoCA signal between (MoCA-enabled) device that the MoCA of couple in adapter enables, and prevents that simultaneously the MoCA signal from disturbing the correct function such as embedded multimedia terminal adapter (eMTA) device of " liaison (the lifeline) " phone that also is connected to couple in adapter.
Background technology
Catv network uses the infrastructure of coaxial cable, signal splitter and combiner, relay amplifier, filter, main line, cable breakout, branch line and other signal conduction devices of interconnection high frequency " downstream " signal to be provided and it is distributed to CATV subscriber's guard station (family and office) from the main signal dispensing mechanism that is called as " head end ".The subscriber device of downstream signal operation such as television set, telephone set and computer.In addition, most of catv network also sends back " upstream " signal the head end of catv network from subscriber device.For example, the subscriber uses set-top box to select to be presented at program on the television set.As another example, when use was connected to the personal computer of public the Internet by CATV infrastructure, two-way communication was absolutely necessary.As another example, voice-over ip (VOIP) telephone set uses CATV infrastructure and public the Internet as the communication media that is used to transmit two way telephone conversation.
The interoperability of the equipment related with catv network infrastructure of transmission and subscriber device and outside, subscriber guard station when allowing upstream and downstream CATV signal, the downstream is limited in two different frequency bands with stream signal.In most of catv network, downstream frequency band is positioned at the scope of 54-1002 megahertz (MHz), and upstream frequency band is positioned at the scope of 5-42MHz.
Downstream signal is located to be delivered to the subscriber guard station from catv network infrastructure at CATV couple in adapter (it also is called as access device, terminal adapter or branch (drop) amplifier usually).Couple in adapter is a multi-port device, and it is connected at the access interface place from the CATV breakout cable of catv network infrastructure and its and is connected to coaxial cable in many other dispensing ports, and this coaxial cable extends through the subscriber guard station and arrives the cable outlet.Each cable outlet can be used for being connected to subscriber device.Typically, owing to may use dissimilar subscriber devices in different rooms, therefore most of family has the coaxial cable that extends to the cable outlet in each room almost.For example, in the many different room of family or office, use television set, computer and telephone set usually.A plurality of dispensing ports of couple in adapter are delivered to downstream signal each cable outlet and stream signal are transmitted to breakout cable and CATV infrastructure from subscriber device by couple in adapter.
Except that television set, computer and phone, can use a large amount of relatively other amusements and multimedia device in the family.For example, digital VTR (DVR) is used for broadcast program, still photo and mobile picture record at storage medium, thereby can be in this content of resetting on display or television set of the later time that the user selects.As another example, also on display or television set, play computer game.This computer game can be in those recreation that obtain from catv network on the internet or those recreation that obtain from the medium that the playback reproducer that is connected to display or television set is play.As another example, the receiver of the satellite broadcast signal that can distribute in the family is watched or is listened to being used to.The device of these types comprises the more traditional television set, telephone set and the device that are connected to the internet by catv network, is commonly referred to as multimedia device.
A plurality of diverse locations at home or in the subscriber guard station use the expectation of multimedia devices to cause the establishment of coaxial cable multimedia alliance (MoCA).MoCA has developed product specification with establishment be used to the to interconnect entertainment network of being in of the at present known and following multimedia device.The MoCA network of being in uses and to be initially dispensing CATV signal in the subscriber guard station and the subscriber guard station of setting up or the coaxial cable infrastructure of being in, mainly be because this coaxial cable infrastructure has been present in most of family and can bearing ratio CATV frequency band in the much more information of loaded information.By MoCA is enabled or the MoCA interface arrangement be connected cable exit in the room of subscriber guard station, set up the MoCA network.These MoCA interface arrangements are realized MoCA communication protocol, and its signal that will be used by multimedia device usually is encapsulated in the MoCA signal packets and is being connected transmission MoCA signal packets between other MoCA interface arrangements in other cable exits subsequently.Receive the MoCA interface arrangement removes encapsulation from the MoCA signal packets multi-media signal, and multi-media signal is delivered to display, computer or other multimedia devices that is connected, and content is presented to the user from described display, computer or other multimedia devices.
The device that each MoCA enables can be in or the MoCA network of subscriber guard station in the device that enables of each other MoCA communicate by letter with at home or send content of multimedia in the subscriber guard station everywhere.Can obtain different position display, broadcast that can be at home from the content of multimedia of a multimedia device or be used, and needn't physically the multimedia device of making a start be repositioned onto another location the subscriber guard station from a position with other forms.The aspect that more fully utilizes the multimedia device that exists in the Modern Family that is delivered in of content of multimedia is considered to be useful.Because the operation of the MoCA network of subscriber guard station must be carried out simultaneously with the operation of CATV service, therefore, the utilization of MoCA signal is different from the frequency range of the frequency range of CATV upstream and downstream signal.Typical MoCA frequency band is 1125-1525MHz.The so-called D frequency band of this MoCA signal is divided into eight different frequency range D1-D8, and the communication between the device that enables of these eight different D frequency ranges MoCA of being used to guarantee to select.For example, the D-1 frequency band that is in 1125-1175MHz can be used for and the MoCA interface arrangement of the associated with set-top box in the main room in house and be connected between another MoCA interface arrangement of the television set in the bedroom in house and transmit the CATV content of TV program, and the MoCA interface arrangement that is connected to the computer game multimedia device in the basement in house is being on the D-6 frequency band of 1375-1425MHz another MoCA interface arrangement that contents of computer games is delivered to the computer association of the playroom that is arranged in the house simultaneously.The MoCA frequency band also comprises other frequency ranges, but because the D frequency band is mainly used in the connection of setting up between the MoCA interface arrangement, so the D frequency band is main relevant (of major relevance).
Although the coaxial cable infrastructure of using the subscriber guard station has been simplified the realization of MoCA network significantly as communication media, do some shortcoming of existence like this.The MoCA signal has the ability of passing the CATV access device and entering catv network infrastructure, and wherein these MoCA signals can pass breakout cable subsequently and enter another subscriber's guard station.The existence of adjoining the MoCA signal at place, subscriber guard station has damaged privacy and the fail safe that initial expection only is limited in the information in the original subscriber guard station.The MoCA signal from original subscriber guard station that enters another subscriber guard station by catv network also has the possibility of the performance that influences the MoCA network in other subscriber guard stations unfriendly.May cause that from original and MoCA signals from collision other subscriber guard stations the MoCA interface arrangement breaks down or operation improperly.
Catv network suffers the adverse effect from so-called intrusion noise, and this noise enters catv network from the external source that is positioned at the subscriber guard station.The typical range of invading noise is in the frequency band of 0-15MHz, but also may reside in other upstreams or downstream frequency.Invade the noise alleviator and be developed the intrusion noise that is used for controlling or reducing the 0-42MHz frequency band, but the 1125-1525MHz signal in the MoCA frequency range obviously is in outside the scope of normal intrusion noise from the subscriber guard station.Therefore, typically invade noise and control device for forbidding that the MoCA signal is invalid.
The outer MoCA signal of CATV signal band that resides in 5-42MHz and 54-1002MHz may constitute another noise source of catv network.Independent MoCA frequency suppresses (frequency rejection) filter and has been developed and is used for the outside and is connected to the CATV couple in adapter, to make great efforts the keeping MoCA frequency signal to be restricted to the subscriber guard station.Yet the use of this device suffers undelegatedly to remove, distorts, the carelessness during original the installation, and may cause the physics of malfunctioning too early or fault to expose.
Because catv network and the initial expection of the cable infrastructure of being in are used to send the CATV signal, problem therefore also occurred.The cable infrastructure of typically being in uses signal splitter that single CATV downstream signal is divided into a plurality of CATV downstream signals and a plurality of CATV stream signal are combined as single CATV stream signal.The CATV couple in adapter initial and unexpected be used for having at it transmit the MoCA signal between source port, and this is for realizing that in the MoCA network transmission of MoCA signal is necessary.In order to realize the MoCA network, the MoCA signal must pass through or " jump " between the signal component leg (leg) of the separation that is connected to a plurality of signal splitter/combiners that source port arranged.This signal passes through and is called as " splitter jump ".
Typical signal splitter has the signal suppressing or the isolation of height between the signal component leg of its separation.When jumping between the signal component leg of MoCA signal in the separation of splitter or passing through, the degree of signal suppressing or isolation greatly makes the strength retrogression of MoCA signal.The uncertain difference of cable infrastructure owing to be in, physics MoCA signal communication paths also is variable.MoCA communication protocol is discerned the possibility of variable intensity MoCA signal and the ability of the variable intensity of the MoCA signal of lifting MoCA signal strength signal intensity to compensate otherwise will transmit between the device that MoCA enables is provided.
The intensity of MoCA signal or power can be far longer than the intensity or the power of the CATV signal that transmits in the subscriber guard station.The MoCA signal of higher-wattage can be produced by following situation: the MoCA device compensates the signal strength signal intensity that reduces by intensity or the power that promotes the MoCA signal that is transmitted, perhaps can be produced by following simple fact: than the obvious longer signal path that the CATV downstream signal passes through on catv network infrastructure, the MoCA signal passes through obviously shorter signal path in the MoCA of subscriber guard station network.Therefore, the MoCA signal has the ability of the correct function that influences the CATV subscriber device unfriendly.
An example from the remarkable adverse effect of MoCA signal appears in the CATV couple in adapter of following type: it has passive signal dispensing port and a plurality of active signal dispensing port.This CATV couple in adapter offers passive CATV downstream signal passive port and receives passive CATV stream signal from the eMTA device that is connected to passive port.The CATV couple in adapter also offers active C ATV downstream signal it a plurality ofly to be had each in the source port and a plurality ofly has the source port each to receive active C ATV stream signal from it.This couple in adapter comprises splitter, and it is divided into passive signal and active signal with the CATV downstream signal.Passive signal was conducted by couple in adapter and without amplifying, regulate or revising before they are delivered to subscriber device from passive port.Active signal conduction usually passes through the forward path amplifier, wherein amplifier with the CATV downstream signal from having before source port is delivered to active subscriber device, intensity to these CATV downstream signals is amplified, and perhaps some characteristics of these CATV signals is made amendment or regulates.Most of subscriber device is benefited from the CATV downstream signal of amplification.Most of port on the CATV couple in adapter is that source port is arranged.Usually only provide a passive port for each couple in adapter.The subscriber device that is connected to the passive port of couple in adapter is embedded multimedia terminal adapter (eMTA) device, " liaison " telephone set typically.The eMTA device has made up cable modem and simulation telephony adapter.Cable modem be provided for to the data-interface that transmits the Internet protocol packets from catv network, and simulation telephony adapter provides the voice-over ip (VoIP) that is used for analog telephone interface.The eMTA device is changed between analog voice signal and grouping.The liaison phone is the well known example of eMTA device.
The passive signal of conduction by couple in adapter do not experienced amplification, adjusting or modification the couple in adapter at them before being delivered to passive eMTA subscriber device from passive port.Usually, passive signal is expected at and keeps under the contingency condition can obtaining with useful.The function of liaison telephone set can not depend on the amplifier in the passive signal path or the correct function of other active signal adjusters.Therefore, than at the power that is connected to the MoCA signal that transmits between the MoCA device that source port is arranged of couple in adapter, the passive CATV downstream signal that eMTA liaison telephone device receives has low relatively power.
Couple in adapter comprises: upstream band pass filter, the CATV stream signal in its conduction 5-42MHz frequency band; And the downstream band pass filter, the CATV downstream signal in its conduction 54-1002MHz frequency band.Although CATV upstream and downstream band pass filter expection is used for suppressing basically the signal outside the logical frequency of (reject) their band, the MoCA signal of the obvious higher-wattage in the 1125-1525MHz frequency band has the ability to see through typical C ATV upstream and downstream band pass filter to be enough to be equal to or to surpass (predominate) be delivered to the CATV downstream passive signal of eMTA subscriber device from passive port the intensity of intensity.The MoCA signal is a noise for the eMTA subscriber device, and the eMTA subscriber device can not turn round in response to the MoCA signal.Yet, to such an extent as to the intensity of MoCA signal can constitute so remarkable noise level uniform or excessively drive the eMTA device and disturb its function thus or make its function corrupt to the degree that can not realize reliable communication.For this reason, than the active and access interface of couple in adapter, the CATV couple in adapter that also is used as the part of MoCA network suffers for the MoCA Signal Spacing of passive port or the requirement of inhibition.At present, the passive port isolation of about 60dB is considered to wish.
Only about not being that the problem of correct function of eMTA subscriber device that power disturbance from the MoCA signal is connected to the passive port of CATV couple in adapter has appearred in subscriber device that MoCA enables.The subscriber device intended response that MoCA enables is in the MoCA signal operation, and the result, has the ability to suppress also in response to CATV downstream and stream signal operation the time unwanted MoCA signal.At present, most of passive subscriber device is not that MoCA enables.Therefore, also conducting in the MoCA of subscriber guard station network in the CATV couple in adapter of MoCA signal, the problem that the MoCA signal hinders the correct function of passive subscriber device is tangible.
Summary of the invention
The present invention relates to the CATV couple in adapter, it advantageously contributes to the be in foundation of network of MoCA under the situation that does not make the quality deterioration that eMTA subscriber device and signal that provides from the eMTA subscriber device and service are provided.CATV couple in adapter of the present invention has been eliminated the disturbing effect of the MoCA signal of its passive port effectively, has avoided the MoCA signal to disturb the problem of the correct function of the eMTA subscriber device that is connected to passive port thus.When transmitting the hub of MoCA signal between the device that the CATV couple in adapter enables as the MoCA that source port is arranged that is being connected to couple in adapter, the present invention allows to use effectively the eMTA subscriber device that is not that MoCA enables.So when setting up the MoCA network in the subscriber guard station, the subscriber device that can under the situation of not bringing extra cost, use non-MoCA to enable effectively to the subscriber.This CATV couple in adapter has also strengthened the intensity of the MoCA signal that transmits in the MoCA network.
In order to realize these and other improvement, one aspect of the present invention relates to a kind of CATV couple in adapter, and it has and is used for transmitting the access interface of CATV downstream and stream signal and having passive dispensing port and a plurality of active dispensing port that is used for transmitting to the subscriber device at place, subscriber guard station CATV downstream and stream signal with catv network.Passive port is suitable for being connected to the eMTA subscriber device.There is source port to be suitable for being connected to the subscriber device that the MoCA in the MoCA network at CATV subscriber device and place, subscriber guard station enables.These are a plurality of to have between the source port subscriber device that also MoCA that is connected to source port in the MoCA of subscriber guard station network enables and transmits the MoCA signal.The first two-way splitter/combiner of couple in adapter has common terminal, and it is connected to access interface to transmit CATV downstream and stream signal with catv network.First division device/combiner also has the first and second signal component legs that separate.First division device/combiner makes the CATV downstream signal be split into division CATV downstream signal and each division CATV downstream signal is offered the first and second signal component legs.First division device/combiner is created single combination stream signal and should be made up stream signal according to each stream signal that receives at the first and second signal component leg places and offers common terminal.The passive signal communication path extends between the first signal component leg of first division device/combiner and passive port.The passive signal communication path conducts passive signal between the first signal component leg of passive port and first division device/combiner.The active signal communication path extends with conduction from the secondary signal component leg of first division device/combiner to be gone to and from the active signal of the secondary signal component leg of first division device/combiner.The second two-way splitter/combiner has common terminal and a plurality of signal component legs that separate.Each signal component leg has been connected to source port.Second splitter/combiner makes each signal that receives at its common terminal place be split into heading signal and each heading signal is offered each signal component leg.Second splitter/combiner is also according to each the CATV stream signal that receives at each signal component leg place and MoCA signal creation combination active signal and should make up active signal and offer its common terminal.Second splitter/combiner is carried out signal division and signal combination to CATV downstream signal, CATV stream signal and MoCA signal.The one MoCA frequency rejects trap is connected between the active signal communication path and second splitter/combiner.The one MoCA frequency rejects trap suppress the quite most power of the MoCA signal that the common terminal place of comfortable second splitter/combiner exists and under the situation that not have decay basically by being delivered to and transmitting the CATV upstream and downstream signal of having source port by oneself.
An additional aspect of CATV couple in adapter relates to a MoCA frequency rejects trap, it makes the common terminal that returns second splitter/combiner since the power reflection of the MoCA signal of the common terminal reception of second splitter/combiner, and second splitter/combiner will reflect the signal component leg that the MoCA signal offers second splitter/combiner as division from the MoCA signal of MoCA frequency rejects trap reflection, increase efficient and power that the MoCA signal dispensing between the source port is arranged at couple in adapter thus.The MoCA signal interpolation power that the MoCA signal that is reflected passes through between the signal component leg at signal splitter/combiner or jumps.
Another additional aspect of CATV couple in adapter relates to the 2nd MoCA frequency rejects trap, and it is connected in the first signal component leg and the passive signal communication path between the passive port of first division device/combiner.The 2nd MoCA frequency rejects trap suppresses the quite most power of the MoCA signal that the first signal component leg place from first division device/combiner exists, and eliminates thus or reduce the MoCA signal influence and the maintenance of the eMTA subscriber device that is connected to passive port is delivered to and transmits from the CATV upstream and downstream quality of signals that is connected to the eMTA subscriber device of passive port.
The another additional aspect of CATV couple in adapter relates to the 3rd MoCA frequency rejects trap, and it is connected between the common terminal and access interface of first division device/combiner.The 3rd MoCA frequency rejects trap suppresses from the quite most power of the MoCA signal of the common terminal place existence of first division device/combiner and is not having basically under the situation about decaying by being delivered to and transmitting from the CATV of access interface upstream and downstream signal.The conduction of the MoCA signal on the 3rd MoCA signal frequency rejects trap hinders from the MoCA network of subscriber guard station to catv network and hinder the conduction of the false MoCA signal the MoCA network from catv network to the subscriber guard station.
Another aspect of the present invention relates to a kind of method, and it prevents that the MoCA signal that transmits between the subscriber device that the MoCA that is connected to the CATV couple in adapter in the MoCA network enables from disturbing the communication from the eMTA subscriber device that connects by the CATV couple in adapter to catv network.This method comprises: the passive port that the eMTA subscriber device is connected to couple in adapter, between catv network and eMTA subscriber device, transmit passive CATV downstream and stream signal by couple in adapter and passive port, the subscriber device that each MoCA is enabled is connected to a plurality of of having in the source port of couple in adapter, between the subscriber device that MoCA in the MoCA network enables by couple in adapter with there is source port to transmit the MoCA signal, in couple in adapter, make the CATV downstream signal that receives from catv network be split into division CATV downstream signal and a division CATV downstream signal is offered passive port and other divisions CATV downstream signal has been offered source port, in couple in adapter, will be combined as CATV combination stream signal and this CATV combination stream signal will be offered catv network from couple in adapter from passive port and the CATV stream signal that has source port to receive, in couple in adapter, will be the combination active signal from CATV stream signal and the MoCA signal combination that has source port to receive, offer a MoCA frequency rejects trap in the couple in adapter and suppress quite most power by making up active signal, and under the situation that not have decay basically, make CATV downstream and stream signal in the combination active signal pass through a MoCA frequency rejects trap from the MoCA signal in the combination active signal.
An additional aspect of this method relates to, and makes from the division of a MoCA frequency rejects trap to reflect the MoCA signal reflex to source port is arranged.The power of division reflection MoCA signal and be added in together to strengthen from there being source port to be transmitted to the power of the MoCA signal of the subscriber device that the MoCA the MoCA network of subscriber guard station enables at the power that the MoCA signal that passes through between the source port is arranged.
Another additional aspect of this method relates to, offer the 2nd MoCA frequency rejects trap in the couple in adapter by making up active signal, inhibition from otherwise be transmitted to the quite most power of any MoCA signal of the combination active signal of passive port, and under the situation that is not having decay basically, make and utilize CATV downstream that the dead terminal oral instructions pass and stream signal by the 2nd MoCA frequency rejects trap.
Another additional aspect of the present invention relates to, be not delivered to and transmit under the situation of the CATV of couple in adapter upstream and downstream signal attenuation not making basically, utilize the 3rd MoCA frequency rejects trap in the couple in adapter, suppress from otherwise will be transmitted to catv network and otherwise will be transmitted to the quite most power of the MoCA signal the couple in adapter from couple in adapter from catv network.
By in conjunction with the accompanying drawing of hereinafter summary detailed description, and, can more intactly be familiar with the present invention, and can obtain the present invention and realize above and other improved mode with reference to claims with reference to following presently preferred embodiment.
Description of drawings
Fig. 1 is the block diagram that diagram merges a plurality of CATV couple in adapters of the present invention, and some adapters are shown as and make the MoCA that is positioned at the subscriber guard station be in network and catv network interconnection.
Fig. 2 is the vague generalization perspective view of a CATV couple in adapter shown in Fig. 1 in the subscriber guard station, and this CATV couple in adapter is connected to the MoCA network and is connected to the active and passive subscriber device shown in the block diagram form.
Fig. 3 is the block diagram of the functional part of the CATV couple in adapter shown in Fig. 2, and this CATV couple in adapter is shown as and is connected to catv network, is connected to passive subscriber device, and the active subscriber device that is connected to the node that forms the MoCA network.
Embodiment
Usually show among Fig. 1 and merge community of the present invention access TV or cable television (CATV) couple in adapter 10.CATV couple in adapter 10 is arranged in CATV subscriber's 12 places, guard station or CATV subscriber's guard station 12 and forms the be in part of entertainment network 14 of traditional MoCA.Multimedia device 16 is by 14 interconnection of the MoCA network in the subscriber guard station 12.Multimedia device 16 uses MoCA network 14 transmitting content of multimedia or MoCA signal each other.MoCA network 14 is partly formed by the coaxial cable infrastructure that is pre-existing in that exists in the subscriber guard station 12 (generally by coaxial cable 18 expressions).The example of multimedia device 16 is digital VTR, computer, data modem unit, computer game, television set, TV set-top box and other audio frequency and vision entertainment device.Usually, multimedia device 16 constitutes active subscriber device.
CATV couple in adapter 10 also is the part of traditional catv network 20.The CATV couple in adapter with in the CATV perhaps signal be delivered to the subscriber device of subscriber guard station 12 from catv network 20.Except that multimedia device 16, subscriber device can also comprise other devices that do not turn round but the expection conduct is connected to the result of catv network 20 as the part operation of MoCA network 14.Usually are not eMTA devices 21 as the example of the subscriber device of the part of MoCA network 14, it is by voice modem 46 and telephone set 48 illustrations that are connected.
CATV couple in adapter 10 has useful characteristic, described characteristic allow its in MoCA network 14 and in catv network 20 simultaneously by a plurality of roles running, be of value to thus MoCA network 14 and catv network 20 the two.CATV couple in adapter 10 is as the hub in the MoCA network 14, to transmit between multimedia device 16 effectively or dispensing MoCA signal.CATV couple in adapter 10 also turns round by traditional role as catv network 20 and the interface between the subscriber device at place, subscriber guard station, is convenient to the CATV service at the subscriber thus.In addition, CATV couple in adapter 10 prevents effectively from the MoCA signal interference of MoCA network 14 and the function and the performance of deterioration eMTA device 21, be connected to couple in adapter 10 and mutual even guarantee MoCA network 14 thus, will keep the expectation function of the eMTA device that is connected with it.These and other improvement and function have hereinafter been described in more detail.
Catv network 20 shown in Fig. 1 has typical topology.Downstream signal 22 rises from the program source at head end 24 places of catv network 20, and is transmitted to CATV couple in adapter 10 in the continuous path by trunk cable 26, signal splitter/combiner 28, submain cable 30, another signal splitter/combiner 32, distribution cable coupling box (distribution cable branch) 34, cable breakout 36 and breakout cable 38.Stream signal 40 is delivered to catv network 20 from CATV couple in adapter 10, and is transmitted to head end 24 by opposite order.Traditional relay amplifier 42 is dispersed in the suitable position in the topology of catv network 20, and it amplifies downstream signal 22 and stream signal 40.Traditional relay amplifier also can be included in the cable breakout 36.Cable breakout 36 and signal splitter/combiner 28 are divided into a plurality of downstream signals that separate with 32 with single downstream signal, and a plurality of stream signal are combined as single stream signal.
CATV couple in adapter 10 receives downstream signals 22 in catv network connection or access interface 44 places from catv network 20.Passive downstream signal is transmitted to eMTA device 21 by CATV couple in adapter 10 and regulates without amplification, enhancing, modification or other essence.Passive downstream signal is delivered to passive subscriber device from passive port 45, i.e. the eMTA device of being represented by the voice modem 46 that is connected to telephone set 48 21.Active downstream signal by the active electronic circuit block (such as amplifier) of the consumed power in the CATV couple in adapter 10 for example amplify, the adjusting of filtering, modification, enhancing or other modes.Active downstream signal is divided into a plurality of duplicates, and has in the source port (be labeled as 49 jointly, but be labeled as 50,52,54 and 56 separately in Fig. 2) each to send duplicate from a plurality of.Active downstream signal is delivered to the active subscriber device that is positioned at 12 places, subscriber guard station.
Typically, active subscriber device will be as the part of MoCA network 14 and the multimedia device 16 that connects.Yet active subscriber's device needs not to be that MoCA enables.The example of active subscriber's device that non-MoCA enables is the television set that source port is arranged that is directly connected to the CATV couple in adapter under the situation of not using the MoCA interface.In this example, the television set that enables of non-MoCA will not be the part of MoCA network 14.
The CATV subscriber device typically generates stream signal 40 (Fig. 2) and they is delivered to CATV couple in adapter 10 with for delivery to catv network 20.Stream signal 40 can be the passive stream signal that eMTA device 21 generates, perhaps stream signal 40 can be by as be connected to the illustrative active subscriber device of set-top box (all not shown) of television set or the active stream signal that multimedia device 16 generates.Set-top box allows subscriber/beholder to carry out program and watches selection.
More details about the CATV access device have been shown among Fig. 2.CATV couple in adapter 10 comprises housing 58, and it seals internal electronics parts (shown in Fig. 3).Mounting flange 60 allows CATV couple in adapter 10 is attached to the supporting construction at place, subscriber guard station around the hole 62 in housing 58 and the flange 60.The electrical power that is used for the active parts of CATV couple in adapter 10 provides from the traditional DC power supply 66 that is connected to special power input port 68.As an alternative, electrical power can provide by one the traditional power inserter (not shown) that is connected in source port 50,52,54 or 56.The power inserter allows to conduct the DC power of relative low-voltage by the identical source port that has that also conducts high-frequency signal.Use traditional power inserter to eliminate needs, the alternative port that can also apply electrical power by it perhaps is provided the power source special port 68 that separates.Power supply 66 or typically derive from traditional wall outlet (not shown) the subscriber guard station from the power that the power inserter provides.The catv network that catv network 20 is connected to CATV couple in adapter 10 connects access interface 44.
Port 44,45,50,52,54,56 and 68 is all preferably formed by traditional female coaxial cable connector, the internal part that it is mechanically connected to housing 58 and is connected electrically to CATV couple in adapter 10.Coaxial cable 18 and breakout cable 38 (Fig. 1) from subscriber guard station cable infrastructure are connected to CATV couple in adapter 10 by the public coaxial cable connector of the corresponding cooperation (not shown) on these coaxial cables being mechanically connected to the female coaxial cable connector that forms port 44,45,50,52,54,56 and 68.
Settle a CATV couple in adapter 10 at each place, subscriber guard station.Active and passive port 45,50,52,54 and 56 quantity are by the quantity decision of the coaxial cable 18 that spreads all over subscriber guard station cabling.Although the CATV couple in adapter 10 shown in Fig. 2 comprises seven ports, other couple in adapters can have the greater or lesser port of quantity.The quantity of the coaxial cable 18 in the subscriber guard station and cabling have constituted the cable infrastructure by being in of using of MoCA network 14 (Fig. 1) or subscriber guard station.
Because CATV service provider provides the CATV couple in adapter 10 that is used by each CATV subscriber, therefore advantageously, the quantity of the difference configuration of the CATV couple in adapter that the minimizing subscriber may need.Except other things, doing like this provides the mass-produced economical efficiency of scale, has reduced the chance of setup error, cable infrastructure that the permission subscriber expands and change is in, and reduced cost of inventory.Incorporating function in CATV couple in adapter 10 into has also promoted the economical efficiency of scale, mistake minimizing, extended capability, multifunctionality and cost of inventory to reduce so that the ability as the hub in the MoCA network 14 (Fig. 1) to be provided to it.Utilize improvement described below, CATV couple in adapter 10 allows effectively to use eMTA device 21 and the multimedia device 16 that connects in MoCA network 14, and can deterioration or the expectation function of the eMTA device 21 that infringement connected.
Each coaxial cable 18 of the cable infrastructure of being in terminates at cable and exports 70 places.Those current untapped coaxial cables 18 preferably export the suitable termination resistor (not shown) termination at 70 places with the cable that is positioned at these coaxial cables 18.Yet, in most of situation, the MoCA interface arrangement 72 that the cable of coaxial cable 72 outlet 70 multimedia devices 16 that are connected to separation are connected.
Each MoCA interface arrangement 72 is traditional and comprises the controller (not shown) that this controller is programmed to have the necessary function that is used to realize MoCA communication protocol.Each MoCA interface arrangement 72 is connected between cable outlet 70 and the multimedia device 16.When multimedia device 16 is created output signal, these output signals are packed or otherwise be included in the MoCA signal that MoCA interface arrangement 72 creates, and these MoCA signals are by a MoCA interface arrangement 72 coaxial cable 18 by family's cable infrastructure subsequently, are sent in the MoCA network 14 at place, subscriber guard station another by the CATV couple in adapter 10 as the MoCA hub and receive MoCA interface arrangement 72.Receive MoCA interface arrangement 72 and extract initial encapsulation or otherwise be included in original output signal in the MoCA signal, and receive MoCA interface arrangement 72 with these original output signals offer receive MoCA interface arrangement 72 attached multimedia device 16.Receive MoCA interface arrangement 72 and supervisory signal can be sent it back original transmitted MoCA interface arrangement 72 with the reception of confirming the MoCA signal and information such as signal strength signal intensity is provided in addition.By this mode, comprise from the MoCA signal of the content of multimedia of a multimedia device 16 and be delivered to multimedia device 16 that another MoCA enables to use in its position by MoCA network 14 (Fig. 1).Turn round by this mode, and aspect the conventional term of using in network field, MoCA interface arrangement 72 and multimedia device 16 have formed a node 74 of MoCA network 14.The MoCA signal transmits between the different MoCA node 74 of MoCA network 14 by described mode.
Separate although MoCA interface arrangement 72 is shown as with multimedia device 16, each MoCA interface arrangement 72 typically is incorporated in the multimedia device 16 that each MoCA enables or as its integral part.Yet for those multimedia devices 16 that does not comprise built-in MoCA interface arrangement 72, the device 72 that isolated M oCA enables is connected to multimedia device 16 and participates in MoCA network 14 to allow it thus as node.
The internal functional unit of CATV couple in adapter 10 has been shown among Fig. 3.These internal circuit components comprise first traditional double to signal splitter/combiner 76, the downstream signal 22 from catv network 20 that its division receives at the common terminal place from access interface 44.Downstream signal 22 is split at the passive CATV downstream signal 78 at signal component leg 77 places of a separation and is split into active C ATV downstream signal 80 at signal component leg 81 places of another separation.
Passive downstream signal 78 is directly transferred to passive port 45 and is transmitted to eMTA device 21 by passive port 45 in passive signal communication path 79.Passive stream signal 82 is created by eMTA device 21 and is transmitted to signal splitter/combiner 76 to become the stream signal 40 in the catv network 20 by passive port 45 by passive signal communication path 79.The passive signal communication path 79 that is used for passive signal in the CATV couple in adapter 10 does not comprise the active electronic component of the consumed power of possible malfunctioning or fault, strengthens the reliability of CATV passive communication thus.Because it is using in urgent and critical situation, thus passive signal communication path 79 to be intended to be reliable as far as possible." liaison " telephonic communication capability that voice modem 46 and telephone set 48 (Fig. 1) are set up is an example of eMTA device 21.
Active C ATV downstream signal 80 from the signal component leg 81 of other separation of splitter/combiner 76 is transmitted to a CATV downstream frequency bandpass filter 84 in active downstream signal communication path 85.Downstream filters 84 is by having the signal of the frequency in the frequency range of the CATV downstream of 54-1002MHz, and suppresses signal with the frequency in other scopes.The downstream signal that filter 84 passes through is amplified by amplifier 86 and is provided for the 2nd CATV downstream frequency bandpass filter 88 subsequently, and both also are the parts of active downstream signal communication path 85 these.
Active C ATV downstream signal through amplification and further filtering is transmitted to the MoCA frequency rejects trap 90 with conventional construction subsequently.The function of MoCA frequency rejects trap 90 is to suppress these signals by signal among the MoCA frequency range 1125-1525MHz can not be conducted by filter 90.Signal in the frequency range of MoCA frequency band 1125-1525MHz outside is by MoCA frequency rejects trap 90.The CATV downstream signal is in the 54-1002MHz frequency range, so MoCA frequency rejects trap 90 is easily by the CATV downstream signal.
After passing through MoCA frequency rejects trap 90, the CATV downstream signal in the frequency range of 54-1002MHz is applied to the common terminal of second traditional double to splitter/combiner 94.Splitter/combiner 94 is with the division of these signals or be divided into four identical downstream signals, and each identical downstream signal has roughly 1/4th of the power of the downstream signal that is applied to splitter/combiner 94 at first or signal strength signal intensity.Each heading signal is sent by one from the signal component leg 91,92,93 and 95 of four separation of splitter/combiner 94.From what four heading signals of the signal component leg 91,92,93 of splitter/ combiner 94 and 95 were applied to CATV couple in adapter 10 respectively source port 50,52,54 and 56 places are arranged.Although show four source port 50,52,54 and 56 is arranged, but the splitter/combiner that has the signal component leg of varying number by use, perhaps by using the splitter/combiner of a plurality of cascades, realized more having source port, the heading signal of the desired amt of source port has been arranged with all that obtain being applied to couple in adapter 10.
In response to regard to the degree that the obtainable CATV downstream signal of source port 50,52,54 and 56 places is arranged, each MoCA interface arrangement 72 is directly delivered to multimedia device 16 with these downstream signals with regard to the multimedia device 16 that is connected to source port by coaxial cable 18.The CATV downstream signal that MoCA interface arrangement 72 is not revised or otherwise influence is passed through it.Can send in the situation of CATV stream signal 96 at those multimedia devices 16, those CATV stream signal 96 are passed MoCA interface arrangement 72 equally and are not changed or influence and subsequently by cable outlet 70, coaxial cable 18 and there is source port 50,52,54 or 56 to be transmitted to splitter/combiner 94.Splitter/combiner 94 makes up all CATV stream signal 96 and these signals is offered MoCA frequency rejects trap 90 as the active stream signal 96 of combination.Because CATV stream signal 96 is in the frequency band of 5-42MHz and outside the MoCA of 1125-1525MHz frequency band, thus CATV stream signal 96 by MoCA frequency rejects trap 90 upstream passing in active signal communication path 99.
Be provided for a CATV upstream frequencies band pass filter 98 of active stream signal communication path 99 from the active stream signal 96 of the combination of MoCA frequency rejects trap 90.Filter 98 is by having the signal of the frequency in the CATV of 5-42MHz upstream frequencies scope, and suppresses signal with the frequency in other scopes.The CATV stream signal that filter 96 passes through is provided for the intrusion noise subsequently and alleviates circuit 100.Invading noise alleviates circuit 100 and controls intrusion noise in the 0-42MHz scope of the noise source that may rise in the subscriber guard station.The use that the intrusion noise alleviates circuit 100 is optional in CATV couple in adapter 10, if but use, then preferably use and have the U.S. Patent application of submitting on October 13rd, 2,008 12/250 that is entitled as " Ingress Noise Inhibiting Network Interface Device and Method forCable Television Networks ", the noise of the form of describing in 227 alleviates circuit 100, and this application is transferred the possession of in assignee of the present invention.
Leave and invade the CATV stream signal that noise alleviates circuit 100 and be applied to the 2nd CATV upstream frequencies band pass filter 102 subsequently.The 2nd CATV upstream frequencies band pass filter 102 also is optional use.If the first upstream band pass filter 98 provides enough frequency filtering features and use the intrusion noise to alleviate circuit 100, then the second upstream band pass filter 102 can be optional.In some cases, or even use to invade noise when alleviating circuit 100, can also eliminate the second upstream band pass filter 102.The intrusion noise alleviates circuit 100 and the 2nd CATV upstream band pass filter 102 also is the part of active stream signal communication path 99.
Be provided for the signal component leg 81 of splitter/combiner 76 from the active stream signal of active stream signal communication path 99.Be provided for the signal component leg 77 of splitter/combiner 76 from the passive stream signal 82 of passive signal communication path 79.Splitter/combiner 76 combinations offer the signal of its signal component leg 77 and 81 to form single combination stream signal 40.
As shown in Figure 3, MoCA network 14 is present in has between source port 50,52,54 and 56 and has passed source port 50,52,54 and 56.Ideally, the MoCA signal in the MoCA network 14 should be restricted to by cable outlet 70, coaxial cable 18, have source port 50,52,54 and 56 and the MoCA interface arrangement 72 of splitter/combiner 94 between the path.When MoCA frequency rejects trap 90 has all power basically of the MoCA signal that enough sizes and ability exist with the common terminal place that controls and suppress splitter/combiner 94 effectively or intensity, the MoCA signal will be limited with this ideal style.Yet, the MoCA frequency rejects trap 90 of having the ability to control effectively with all power basically that suppress the MoCA signal is relative expensive, the parts that the needs manufacturing is a large amount of, make it make difficulty and expensive more thus, and will need significantly bigger manufacturing to make great efforts to carry out tuning to realize that in conjunction with the bandpass characteristics of setting up CATV downstream and upstream filter 84,88,98 and 102 effective MoCA frequency suppresses.Filter 90,84,88,98 in the single couple in adapter 10 and 102 relevant nature make the proper operation of each filter depend on the proper operation of every other filter.Therefore all filters are carried out tuning become expensive, that repeat and iteration behavior consuming time.
Usually, under the situation that the essence that does not have 90 pairs of MoCA signals of MoCA frequency rejects trap suppresses, the MoCA signal with intensity of the correct function that is enough to influence unfriendly eMTA device 21 can see through or otherwise propagate by the circuit of active communication path 85 and 99 and mutual with the passive CATV upstream and downstream signal 82 and 78 in the passive communication path 79.The intensity of the MoCA signal of propagating in this mode may be enough to destroy the information that comprises in passive CATV signal 78 and 82, and infringement or hinder the correct function of eMTA device 21 thus.The intensity of the MoCA signal of propagating in this mode also may be enough to subdue some reflector and the receiver in the eMTA device 21, the correct function that this also will damage or hold it back.
If in couple in adapter 10, only utilize single MoCA frequency rejects trap 90, then this single MoCA frequency rejects trap 90 must have the MoCA signal that suppresses in the couple in adapter 10 or with it with the CATV Signal Spacing and the MoCA signal limitations is arrived the outstanding ability of MoCA network 14.At present, expection will need the minimum isolating power of about 60dB to prevent that the MoCA frequency signal from influencing the correct function of eMTA device 21 unfriendly.The single MoCA frequency rejects trap that manufacturing has a 60dB isolating power is complicated, expensive with consuming time.Need a large amount of relatively parts to create rejects trap with this ability.These parts must carry out tuning assembled and subsequently in following situation: in this case to the tuning tuning influence that will be subjected to CATV band pass filter 84,88,98 and 102 usually of MoCA frequency rejects trap.For fear of make and tuning have be enough to suppress all MoCA signals and prevent that them from entering the cost and the complexity of the single MoCA frequency rejects trap 90 of the signal communication paths 85 of couple in adapter and 99 ability, one or more additional MoCA frequency rejects traps 104 and 108 are incorporated in the couple in adapter 10.In this case, do not need MoCA frequency rejects trap 90 to suppress the whole intensity of MoCA signal, but it change the ability with the very most intensity that is enough to suppress the MoCA signal into.Suppress the remainder of MoCA signal strength signal intensity by one in the additional MoCA frequency rejects trap 104 and 108 or both.
The 2nd MoCA frequency rejects trap 104 is connected in the passive communication path 79.The 2nd MoCA frequency rejects trap 104 suppresses to be delivered to remaining MoCA signal in active downstream and upstream communication path 85 and 99 by a MoCA frequency rejects trap 90.Therefore, because the MoCA frequency of the 2nd MoCA frequency rejects trap 104 suppresses ability, prevented that remaining MoCA signal and eMTA device 21 are mutual.Passive downstream signal that offers eMTA device 21 or the passive stream signal that provides from the eMTA device are not provided the 2nd MoCA frequency rejects trap 104, because the inhibition ability of second rejects trap 104 only is applied to that signal in the 1125-1525MHz scope is opened and the passive downstream of CATV and stream signal occupy the frequency range of diverse 5-42MHz and 52-1002MHz.
The 3rd MoCA frequency rejects trap 108 is connected between the common terminal and catv network access interface 44 of splitter/combiner 76.The 3rd MoCA frequency rejects trap 108 suppresses to see through a MoCA frequency rejects trap 90, active signal communication path 85 and 99 and the remaining MoCA signal of splitter/combiner 76, prevents that thus these remaining MoCA signals from arriving catv network 20.Under the situation that does not have MoCA rejects trap 108, as understanding according to Fig. 1, remaining MoCA signal from a CATV couple in adapter 10 can pass through breakout cable 38 arrival cable breakout 36, and arrives another CATV couple in adapter 10 of different CATV subscribers by another breakout cable 38 of this cable breakout 36 from cable breakout.Prevent that remaining MoCA signal from arriving the privacy of the communication of adjacent subscriber guard station in the original CATV subscriber's of protection MoCA network 14 and preventing to disturb the correct function aspects of different CATV subscribers' MoCA network is important.For similar viewpoint, the 3rd MoCA rejects trap 108 also prevents to enter CATV couple in adapter 10 at access interface 44 places and contribute producing about the problem of going to and communicate by letter from the correct passive signal of eMTA device 21 from the remaining MoCA signal that exists on the catv network 20 of another CATV subscriber's MoCA network.Therefore, the 3rd MoCA frequency rejects trap 108 prevents that the MoCA signal from selecting catv network 20 and preventing that the MoCA signal that catv network 20 exists from entering couple in adapter 10 from couple in adapter 10.
By divide MoCA frequency inhibit feature between a plurality of MoCA frequency rejects traps 90,104 and 108, each MoCA frequency rejects trap can have less ability.It is not too high and not too complicated that this less ability makes MoCA frequency rejects trap manufacture cost.The inhibition ability that reduces is not many to relate to mutual with the CATV band pass filter, reduces thus and can carry out tuning difficulty by force filter to less.The MoCA frequency rejects trap of less ability needs less parts and less manufacturing effort.Usually, dividing MoCA frequency inhibit feature between a plurality of MoCA frequency rejects traps has simplified manufacturing and has realized identical or better MoCA frequency rejection than the MoCA frequency rejection that is obtained by more complicated single MoCA rejects trap 90.
Preferably, the combination of the MoCA frequency rejects trap isolation that realized passive port 45 and access interface 44 and the 60dB at least between in source port 50,52,54 and 56 any one is arranged.Size by determining MoCA frequency rejects trap 90,104 and 108 has realized the isolation of this degree to realize the Signal Spacing of desired 60dB.Because the effect of a plurality of filters is additivitys, method for optimizing is to determine that each size of three MoCA frequency rejects traps 90,104 and 108 is to have the isolation of 30dB at least separately.
Except suppressing the benefit of the MoCA signal in the CATV signal path, MoCA frequency rejects trap 90 also has contribution to the intensity of the MoCA signal of transmission in MoCA network 14.The inhibition ability of MoCA frequency rejects trap 90 partly by reflection MoCA signal but not the power or the intensity that absorb the MoCA signal realize.Directly pass splitter/combiner 94 downstream from the MoCA signal of MoCA frequency rejects trap 90 reflections.Although the intensity of the MoCA signal of reflection is divided by splitter/combiner 94, the intensity of the division reflection MoCA signal at signal component leg 91,92,93 and 95 places is added to the intensity of the MoCA signal of signal component leg 91,92,93 and the existence of 95 places.Under the situation of the additive effect that does not come spontaneous fission reflection MoCA signal, the intensity of the obtainable MoCA signal of signal component leg 91,92,93 and 95 places depends on that fully splitter jumps.As discussed above, splitter jumps and relates to the significant signal decay, therefore significantly reduces the MoCA signal strength signal intensity at port 50,52,54 and 56 places.By adding, can significantly strengthening by the signal reflection characteristic of MoCA frequency rejects trap 90 from signal component leg 91,92,93 and the 95 MoCA signals that obtain of MoCA interface arrangement 72 will be delivered to from the effect of the division MoCA signal of MoCA frequency rejects trap 90 reflections.
The signal strength signal intensity of the enhancing by the MoCA signal created from the reflection of MoCA frequency rejects trap 90 also has contribution to the intensity that reduces the MoCA signal that sees through MoCA frequency rejects trap 90.As discussed above, MoCA communication protocol is had the ability in the information that transmits and receives the signal strength signal intensity that the transmission description receives between the MoCA interface arrangement.Low signal intensity will cause launching the intensity that the MoCA interface arrangement increases the signal of being launched.Under the situation from the additive effect of the division reflection MoCA signal at signal component leg 91,92,93 and 95 places not, receiving the signal strength signal intensity that the MoCA interface arrangement receives will jump and significantly decay owing to the splitter of MoCA signal between the signal component leg of splitter/combiner 94.The signal strength signal intensity that reduces will be passed to emission MoCA interface arrangement, and emission MoCA interface arrangement will respond by the intensity that increases the MoCA signal of being launched.The intensity of the increase of the MoCA signal of being launched will can not suppressed by MoCA frequency rejects trap 90 equally effectively, allow more remaining MoCA signal strength signal intensity to see through the CATV signal communication paths that enters couple in adapter thus.Yet, by the MoCA signal strength signal intensity of enhancing signal component leg 91,92,93 and 95 owing to the additive effect of the MoCA signal that reflects from MoCA frequency rejects trap 90, the signal strength signal intensity of the MoCA signal of being launched is lower, causes less MoCA signal to see through and the correct function of less required MoCA signal suppressing with acquisition eMTA device 21.
When the 3rd MoCA frequency rejects trap 108 was connected to the CATV access interface 44 of CATV couple in adapter 10, the 2nd MoCA frequency rejects trap 104 was important.Remaining certain part that sees through the MoCA signal is from 108 reflections of the 3rd MoCA frequency rejects trap, and those repressed remaining MoCA signals arrive passive communication path 79 by splitter/combiner 76.Therefore, comprise that at CATV access interface 44 places the 3rd MoCA frequency rejects trap 108 has strengthened intensity or the power that is transmitted to the remaining MoCA frequency in the passive communication path 79 owing to signal reflex.
10 pairs of CATV couple in adapters can be from the useful contribution of service quality of catv network 20 and 14 acquisitions of MoCA network.Even, still keep the correct function of the eMTA device 21 at place, subscriber guard station when eMTA device 21 is not that MoCA enables and the MoCA network is created as when having couple in adapter 21.(one or more) MoCA frequency rejects trap is controlled those and is seen through from the MoCA network and enter the remaining MoCA signal of passive CATV signal communication paths, remains connected to the liaison of couple in adapter 10 or the expectation function of another eMTA device thus.CATV couple in adapter 10 works to transmit the MoCA signal of sufficient intensity between all MoCA interface arrangements and multimedia device as the MoCA hub fully, keeps the CATV function of expection simultaneously.The CATV couple in adapter also prevents from or greatly hinders the MoCA signal to arrive catv network, avoids damaging the privacy and the fail safe of the MoCA content in the MoCA network that expection only maintains the subscriber guard station thus.Similarly, the CATV couple in adapter also prevents from or greatly hinders on the catv network 20 the MoCA signal that exists to enter the correct function that adapter and interference are connected to the subscriber device of couple in adapter.The favourable function of CATV couple in adapter is to obtain in the housing of CATV couple in adapter, protects the function of this hope to avoid undelegated thus to distort, install carelessness and physics exposes.The multi-functional aspect of CATV couple in adapter allows it to use in many cases, increases the economy of its scale and use and promotion CATV service provider's bigger installation facility thus.CATV couple in adapter 10 allows the subscriber to expand more neatly and changes their CATV subscriber device and their MoCA network and multimedia device.
After obtaining full appreciation of the present invention, these and other improve and the meaning of advantage will become obvious.The preferred embodiments of the present invention and many improvement thereof have above been specifically described.This detailed description is to realize the description of preferred exemplary of the present invention.The details of describing not necessarily plans to limit the scope of the invention.Scope of the present invention is defined by the following claims.

Claims (25)

1. CATV couple in adapter, it uses at place, subscriber guard station and has: access interface is used for transmitting downstream and stream signal with catv network; Passive port is used for transmitting downstream and stream signal with the eMTA subscriber device that is connected to described passive port; And a plurality of source port arranged, be used for being connected to the described active subscriber device transmission of the CATV CATV upstream and downstream signal that source port is arranged, described have source port also being connected between the subscriber device that the described MoCA that source port arranged enables in the MoCA network transmit the MoCA signal, described CATV couple in adapter comprises:
The first two-way splitter/combiner, it has common terminal, described common terminal is connected to described access interface to transmit CATV downstream and stream signal with described catv network, described first division device/combiner also has the first and second signal component legs that separate, described first division device/combiner makes the CATV downstream signal be split into division CATV downstream signal and described division CATV downstream signal is offered the described first and second signal component legs, and described first division device/combiner is created single combination stream signal and described combination stream signal is offered described common terminal according to each stream signal that receives at the described first and second signal component leg places;
The passive signal communication path, it conducts passive signal between extending with the described first signal component leg at described passive port and described first division device/combiner between the described first signal component leg of described first division device/combiner and the described passive port;
Active signal communication path, its described secondary signal component leg from described first division device/combiner extend with conduction to be gone to and from the active signal of the described secondary signal component leg of described first division device/combiner;
The second two-way splitter/combiner, it has common terminal and a plurality of signal component legs that separate, each signal component leg has been connected to source port, described second splitter/combiner makes each signal that receives at its common terminal place be split into heading signal and each heading signal is offered each signal component leg, and described second splitter/combiner also makes up active signal and described combination active signal is offered its common terminal according to each CATV stream signal that receives at each signal component leg place and MoCA signal creation;
Second splitter/combiner, it carries out aforementioned signal division and signal combination to CATV downstream signal, CATV stream signal and MoCA signal; And
The one MoCA frequency rejects trap, it is connected between described active signal communication path and described second splitter/combiner, and a described MoCA frequency rejects trap suppresses to come the quite most power of the MoCA signal that the common terminal place of comfortable described second splitter/combiner exists and by being delivered to and transmitting the CATV upstream and downstream signal that source port is arranged from described.
2. according to the CATV couple in adapter described in the claim 1, wherein:
A described MoCA frequency rejects trap makes and comes the power reflection of the MoCA signal that the common terminal since described second splitter/combiner receives to return in the common terminal of described second splitter/combiner; And
Described second splitter/combiner will offer the signal component leg of described second splitter/combiner from the MoCA signal of described MoCA frequency rejects trap reflection as division reflection MoCA signal.
3. according to the CATV couple in adapter described in the claim 2, wherein:
When being connected to when transmitting the MoCA signal between the subscriber device that the described described MoCA that source port arranged enables, the MoCA signal passes through between the signal component leg of described second splitter/combiner;
Described second splitter/combiner will offer the signal component leg of described second splitter/combiner from the MoCA signal of described MoCA frequency rejects trap reflection as division reflection MoCA signal; And
The power of described division reflection MoCA signal adds power at the MoCA signal that passes through between the signal component leg of described second splitter/combiner to strengthen the power of the MoCA signal that transmits in described MoCA network.
4. according to the CATV couple in adapter described in the claim 3, wherein:
MoCA signal passing through between the signal component leg of described second splitter/combiner makes the strength retrogression who passes through the obtainable MoCA signal of each signal component leg of described second splitter/combiner that obtains from described; And
From decay described MoCA frequency rejects trap reflection and the MoCA signal is reflected in conduction less than the described division that is caused by passing through between each signal component leg of described second splitter/combiner by the decay of the MoCA signal of described second splitter/combiner.
5. according to the CATV couple in adapter described in the claim 1, further comprise:
The 2nd MoCA frequency rejects trap, it is connected in described passive signal communication path between the described first signal component leg and described passive port of described first division device/combiner, described the 2nd MoCA frequency rejects trap prevents to arrive described passive port from the quite most power of the MoCA signal at the described first signal component leg place of described first division device/combiner, and described the 2nd MoCA frequency rejects trap is not having under the situation about decaying basically by being delivered to and transmitting from the CATV of described passive port upstream and downstream signal.
6. according to the CATV couple in adapter described in the claim 5, wherein:
In the described first and second MoCA frequency rejects traps each has the ability that substantially the same being used to suppresses the MoCA signal.
7. according to the CATV couple in adapter described in the claim 5, wherein: each in the described first and second MoCA frequency rejects traps has the ability that is used to suppress the MoCA signal of 30dB at least.
8. according to the CATV couple in adapter described in the claim 5, further comprise:
The 3rd MoCA frequency rejects trap, it is connected between the common terminal and described access interface of described first division device/combiner, described the 3rd MoCA frequency rejects trap prevents to enter described catv network from the quite most power of the MoCA signal of the common terminal place existence of described first division device/combiner, and prevent to arrive by described couple in adapter described passive and source port is arranged, and not have basically under the situation about decaying by being delivered to and transmitting from the CATV of described access interface upstream and downstream signal from the very most power of any MoCA signal that exists on the described catv network.
9. the CATV couple in adapter described in according to Claim 8, wherein:
In described first, second and the 3rd MoCA frequency rejects trap each has the ability that substantially the same being used to suppresses the MoCA signal.
10. according to the CATV couple in adapter described in the claim 9, wherein:
In the described first and second MoCA frequency rejects traps each has the ability that is used to suppress the MoCA signal of 30dB at least.
11. the CATV couple in adapter according to Claim 8 further comprises:
Housing; And wherein:
Described access interface, described passive port and all are described to have source port to be connected to described housing;
Each port section ground is formed by wire and cable connector; And
Described first and second two-way splitter/couplers, described passive and active signal communication path and the described first and second and the 3rd MoCA frequency rejects trap are positioned at described housing.
12. the CATV couple in adapter according to described in the claim 1 further comprises:
Other a MoCA frequency rejects trap, it is connected between the common terminal and described access interface of described first division device/combiner, described other MoCA frequency rejects traps prevent to enter described catv network from the quite most power of the MoCA signal of the common terminal place existence of described first division device/combiner, and prevent to arrive by described couple in adapter described passive and source port is arranged, and not have basically under the situation about decaying by being delivered to and transmitting from the CATV of described access interface upstream and downstream signal from the very most power of any MoCA signal that exists on the described catv network.
13. according to the CATV couple in adapter described in the claim 1, wherein:
Described active signal communication path comprises active downstream signal communication path of CATV and the active stream signal communication path of CATV;
The active downstream signal communication path of described CATV comprises at least one active electronic component, and it need provide electrical power to be delivered to the described CATV downstream signal that source port is arranged to be used to regulate from described access interface by the active downstream signal communication path of described CATV;
The active downstream signal communication path of described CATV is by the CATV downstream signal in the predetermined C ATV downstream frequency band and suppress all downstream signals of other frequencies basically;
The active stream signal communication path of described CATV is delivered to described catv network with the CATV stream signal from the subscriber device that is connected described active port;
The active stream signal communication path of described CATV is by the CATV stream signal in the predetermined C ATV upstream frequency band and suppress all stream signal of other frequencies basically; And
Described CATV passive signal communication path and described the 2nd MoCA frequency rejects trap all do not have need provide electrical power to be used to influence the passive downstream of CATV of transmitting and the active electronic component of stream signal between described access interface and described passive port.
14. according to the CATV couple in adapter described in the claim 13, wherein:
The needs of the active downstream signal communication path of described CATV provide an active electronic component of electrical power to comprise signal amplifier.
15. according to the CATV couple in adapter described in the claim 13, wherein:
The active stream signal communication path of described CATV comprises that invading noise alleviates circuit, and it is controlled in operation from described has the upstream of source port to invade noise.
16. method, be used for preventing disturbing communication from the eMTA subscriber device that connected by described CATV couple in adapter to catv network being connected the MoCA network and being connected to the MoCA signal that transmits between subscriber's device that the MoCA of CATV couple in adapter enables, described method comprises:
Described eMTA subscriber device is connected to the passive port of described couple in adapter;
Between described catv network and described eMTA subscriber device, transmit passive downstream and stream signal by described couple in adapter and described passive port;
Subscriber's device that each MoCA is enabled is connected to a plurality of of having in the source port of described couple in adapter;
Between subscriber's device that described MoCA in described MoCA network enables by described couple in adapter with describedly have source port to transmit the MoCA signal;
In described couple in adapter, make the CATV downstream signal that receives from described catv network be split into division CATV downstream signal and a division downstream signal is offered described passive port and other divisions CATV downstream signal is offered the described source port that has;
In described couple in adapter, will be combined as the combination stream signal and described combination stream signal will be offered described catv network from described couple in adapter from described stream signal passive and that have source port to receive;
In described couple in adapter, will be the combination active signal from described CATV stream signal and the MoCA signal combination that has source port to receive;
Suppress quite most power by described combination active signal being offered a MoCA frequency rejects trap in the described couple in adapter from the MoCA signal in the described combination active signal; And
Under the situation that does not have decay basically, make CATV stream signal in the described combination active signal by a described MoCA frequency rejects trap.
17. the method according to described in the claim 16 further comprises:
Make from the division of described MoCA frequency rejects trap reflection MoCA signal reflex and source port arranged to described.
18. the method according to described in the claim 17 further comprises:
When being connected to when transmitting the MoCA signal between the subscriber device that the described described MoCA that source port arranged enables, described have pass through the MoCA signal between the source port; And
Make the power that the power of division reflection MoCA signal and the power that passes through the MoCA signal are strengthened mutually has source port to be transmitted to the MoCA signal of the subscriber device that MoCA enables from described in described active port.
19. the method according to described in the claim 16 further comprises:
By described combination active signal being offered the 2nd MoCA frequency rejects trap in the described couple in adapter, suppress from otherwise be transmitted to the quite most power of any MoCA signal of the combination active signal of described passive port; And
Under the situation that does not have decay basically, make and utilize CATV downstream that described dead terminal oral instructions pass and stream signal by described the 2nd MoCA frequency rejects trap.
20. the method according to described in the claim 19 further comprises:
Give the ability that substantially the same being used to suppresses the MoCA signal in the described first and second MoCA frequency rejects traps each.
21. the method according to described in the claim 19 further comprises:
Be not delivered to and transmit under the situation of the CATV of described couple in adapter upstream and downstream signal attenuation not making basically, utilize the 3rd MoCA frequency rejects trap in the described couple in adapter, suppress from otherwise will be transmitted to described catv network and otherwise will be transmitted to the quite most power of the MoCA signal of described couple in adapter from described couple in adapter from described catv network.
22. the method according to described in the claim 21 further comprises:
Give the ability that is used to suppress the MoCA signal of 30dB at least in the described first and second MoCA frequency rejects traps each.
23. the method according to described in the claim 16 further comprises:
Be not delivered to and transmit under the situation of the CATV of described couple in adapter upstream and downstream signal attenuation not making basically, utilize other MoCA frequency rejects trap in the described couple in adapter, suppress from otherwise will be transmitted to described catv network and otherwise will be transmitted to the quite most power of the MoCA signal of described couple in adapter from described couple in adapter from described catv network.
24. the method according to described in the claim 16 further comprises:
Comprise that in described couple in adapter at least one active electronic component that electrical power need be provided is delivered to the described CATV downstream signal that source port is arranged to be used to regulate by described couple in adapter; And
In described couple in adapter, do not utilize the active electronic component that electrical power need be provided to influence downstream and the stream signal of between described access interface and described passive port, transmitting.
25. the method according to described in the claim 24 further comprises:
Using the intrusion noise to alleviate circuit in described couple in adapter rises from being connected to the described upstream intrusion noise that the subscriber device of source port is arranged to control.
CN2011100370861A 2010-01-21 2011-01-21 CATV entry adapter and method for preventing interference with eMTA equipment from MoCA signals Pending CN102164255A (en)

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Application publication date: 20110824