US20020057763A1 - Loop integrity test device and method for digital subscriber line (xDSL) communication - Google Patents
Loop integrity test device and method for digital subscriber line (xDSL) communication Download PDFInfo
- Publication number
- US20020057763A1 US20020057763A1 US10/047,529 US4752902A US2002057763A1 US 20020057763 A1 US20020057763 A1 US 20020057763A1 US 4752902 A US4752902 A US 4752902A US 2002057763 A1 US2002057763 A1 US 2002057763A1
- Authority
- US
- United States
- Prior art keywords
- telephone line
- test
- loop
- point
- signature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/50—Testing arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
- H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
- H04M11/062—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors using different frequency bands for speech and other data
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/22—Arrangements for supervision, monitoring or testing
- H04M3/26—Arrangements for supervision, monitoring or testing with means for applying test signals or for measuring
- H04M3/28—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor
- H04M3/30—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop
- H04M3/301—Circuit arrangements at the subscriber's side of the line
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/22—Arrangements for supervision, monitoring or testing
- H04M3/26—Arrangements for supervision, monitoring or testing with means for applying test signals or for measuring
- H04M3/28—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor
- H04M3/30—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop
- H04M3/305—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop testing of physical copper line parameters, e.g. capacitance or resistance
- H04M3/306—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop testing of physical copper line parameters, e.g. capacitance or resistance for frequencies above the voice frequency, e.g. xDSL line qualification
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/02—Constructional details
- H04Q1/028—Subscriber network interface devices
Definitions
- This invention relates in general to data communication, and more particularly to a loop integrity test device and method for digital subscriber line (xDSL) communication.
- xDSL digital subscriber line
- Digital subscriber line (xDSL) communication can provide a high bandwidth data path supported by the twisted pair wiring infrastructure of the public switched telephone network (PSTN).
- xDSL technologies support data service simultaneously with traditional telephone service using a separation technique.
- Suitable xDSL technologies include asymmetric digital subscriber line (ADSL), rate adaptable digital subscriber line (RADSL), symmetric digital subscriber line (SDSL), high-speed digital subscriber line (HDSL) and very high-speed digital subscriber line (VDSL).
- an xDSL communication link is established across the local loop between customer premises equipment (CPE) and the local loop termination point (e.g., central office or remote terminal).
- the local loop termination point typically has a xDSL access multiplexer (DSLAM) that handles the XDSL link on the network side
- the CPE typically includes one or more xDSL termination units (XTU) that handle the xDSL link on the customer premises side.
- DSL access multiplexer DSL access multiplexer
- XTU xDSL termination units
- the twisted pair line on the local loop between the customer premises and the loop termination point must meet certain physical characteristics. If it does not, an xDSL communication link can not be successfully established. Consequently, it can be desirable to allow the xDSL capability of the local loop to be quickly verified at the same time that xDSL service is installed at the customer premises. Further, it can be desirable to monitor the xDSL capability of the local loop on an ongoing and continuous basis.
- a loop integrity test device and method for digital subscriber line communication are disclosed that provide advantages over conventional xDSL communication devices and systems.
- a digital subscriber line (xDSL) communication system allows xDSL communication across a local loop.
- the system includes a local loop termination point and customer premises equipment connected to a twisted pair telephone line.
- Loop integrity test devices for xDSL communication are located at the local loop termination point and the customer premises equipment and are coupled to the telephone line.
- the loop integrity test devices are respectively operable to transmit test signatures across the telephone line, to receive and evaluate test signatures from the telephone line, and to indicate whether the telephone line can support xDSL communication based upon evaluation of test signatures.
- a loop integrity test device includes a line interface unit operable to connect to and interface with a twisted pair telephone line.
- the test device also includes an output device operable to indicate a pass state and a fail state.
- the test device includes a control unit having a generation unit and an evaluation unit.
- the generation unit is operable to transmit a test signature across the telephone line.
- the evaluation unit is operable to receive and evaluate a test signature to determine whether the telephone line can support xDSL communication.
- the control unit is then operable to direct the output device to indicate a pass state if the telephone line can support DSL communication and to indicate a fail state if the telephone line can not support xDSL communication.
- a technical advantage of the present invention is that the integrity of the local loop can be verified at the time of installation of high speed xDSL data service at a customer premises.
- the present loop integrity test device provides an immediate indication of whether the loop can support xDSL communication when it is installed.
- test devices implement a continuous integrity check of the local loop that allows the telephone company or other service provider to be alerted to a problem on the local loop. This notification may allow the service provider to correct the problem before a degradation of service is noticed by the customer.
- FIG. 1 is a block diagram of one embodiment of an xDSL communication system having loop integrity test devices for xDSL communication according to the present invention
- FIG. 2 is a block diagram of one embodiment of a loop integrity test device for xDSL communication according to the present invention.
- FIG. 3 is a flow chart of a method for local loop integrity testing for xDSL communication according to the present invention.
- FIG. 1 is a block diagram of one embodiment of an xDSL communication system, indicated generally at 10 , having loop integrity test devices for xDSL communication according to the present invention.
- System 10 includes customer premises equipment 12 that can be located at any one of a number of customer premises.
- System 10 also includes a local loop termination point 14 which is connected to customer premises equipment 12 via a twisted pair telephone line 16 .
- Customer premises equipment 12 typically includes a network interface device (NID) 18 which forms a physical interface between the customer premises and the telephone network as well as any other equipment located at the customer premises or other remote loop termination point.
- NID network interface device
- Local loop termination point 14 can be a central office, remote terminal or other appropriate termination of the local loop and can include an xDSL access multiplexer (DSLAM) 20 that provides xDSL high bandwidth data service.
- Telephone line 16 supports conventional voice traffic and is intended to support xDSL communications. However, depending upon physical characteristics of telephone line 16 , it may not support xDSL communication or may only support limited xDSL communication. For example, the distance of the local loop, any splices in telephone line 16 , loading on telephone line 16 and other physical characteristics affect the integrity of telephone line 16 for xDSL communication.
- a loop integrity test device 22 is located at customer premises equipment 12
- a loop integrity test device 24 is located at local loop termination point 14 . Both loop integrity test devices 22 and 24 are coupled to telephone line 16 . Loop integrity test devices 22 and 24 respectively operate to transmit test signatures across telephone line 16 and to receive and evaluate a test signature from telephone line 16 .
- the test signature can be a signal with implanted high frequency tones, DC voltages or other distinctive characteristics and can be transmitted periodically at some time interval.
- the test signature can be pulses, tones, modulated tones, xDSL symbols (e.g., Quadrature Amplitude Modulated (QAM) symbols or Discrete Multitone (DMT) symbols), or other xDSL physical layer symbols chosen to allow determination of the line characteristics and the ability of the line to support xDSL communication.
- xDSL symbols e.g., Quadrature Amplitude Modulated (QAM) symbols or Discrete Multitone (DMT) symbols
- DMT Discrete Multitone
- loop integrity test devices 22 are installed in network interface device (NID) 18 at the customer premises. This is done for ease of installation by a service provider and to avoid interference with other customer premises equipment 12 located behind network interface device (NID) 18 . Also, in this implementation, loop integrity device 24 is installed separate from DSL access multiplexer 20 at local loop termination point 14 . Similarly, this is done to avoid interference with DSL access multiplexer 20 . It should be understood that other implementations are possible within the scope of the present invention. For example, loop integrity device 22 can be implemented as part of other equipment at the customer premises or loop termination point 14 such as part of an xDSL termination unit.
- FIG. 2 is a block diagram of one embodiment of a loop integrity test device, indicated generally at 30 , for xDSL communication according to the present invention.
- test device 30 can comprise a line interface unit 32 that connects to a telephone line 34 .
- Line interface unit is coupled to a control unit 36 which can comprise a test signature generation unit 38 and a test signature evaluation unit 40 .
- Control device 36 is, in turn, coupled to an output device 42 .
- Output device 42 can, for example, comprise light emitting diode (LED) devices, an LCD display, a speaker, a register, an electronic signal output or a combination of thereof.
- LED light emitting diode
- line interface unit 32 provides an interface between control unit 36 and telephone line 34 .
- Control unit 36 manages the operation of test device 30 and directs output device 42 .
- generation unit 38 periodically generates and transmits a test signature through line interface unit 32 and across telephone line 34 .
- Generation unit 38 can, for example, generate a test signature by obtaining one from local storage or based upon a generation algorithm. Once generated, the test signature is transmitted to the opposite end point of the local loop.
- test device 30 is located at a local loop termination unit, the test signature is transmitted to test devices located at customer premises. Conversely, when test device 30 is located at the customer premises, the test signature is transmitted to the local loop termination equipment.
- test signature is designed such that pertinent physical characteristics of telephone line 34 can be determined from analysis of changes to the test signature after it has traveled across telephone line 34 .
- xDSL communication is sensitive in that it uses higher frequencies across the twisted pair cooper lines, thus physical characteristics such as impedance and line length are important to the integrity of telephone line 34 .
- Evaluation unit 40 receives test signatures transmitted across telephone line 34 and evaluates the test signatures to determine whether telephone line 34 can support some level of xDSL communication. The evaluation can assess such things as loss of energy, change in bit stream pattern, and other changes of the test signature. Based upon analysis of the test signature, evaluation unit 40 identifies whether telephone line 34 can support xDSL communication. Evaluation unit 40 can then direct output device 42 to provide an indication based upon the results of the evaluation. In particular, if telephone line 34 can support xDSL communication, then a pass state can be indicated. If not, then a fail state can be indicated. The indication can, for example, take the form of an audible alarm, a visual display, an electronic message or an electronic signal. In one implementation, output device 52 can provide an electronic flag to software such that automated loop monitoring can be established at the local loop termination point.
- FIG. 3 is a flow chart of a method for local loop integrity testing for xDSL communication according to the present invention.
- a test signature is transmitted across the local loop telephone line to be tested.
- the test signature is received at the opposite end of the local loop.
- the received test signature is then evaluated, in step 54 , to determine whether the telephone line can support xDSL communication. This determination is accomplished based upon changes to the test signature caused by transmission across the telephone line.
- step 56 an indication is made whether the telephone line can support xDSL communication.
- instant verification of loop integrity for xDSL communication across the local loop can be obtained at install time.
- This functionality can be accomplished using loop integrity test devices that can be loop powered. Once installed, the test devices can also provide continuous monitoring of the loop (i.e., twenty-four hours a day, seven days a week) and can provide both hardware and software alarms to the customer premises and to the service provider.
- the test devices are relatively low in cost and provide important qualification of the local loop for spectral compatibility and loop viability for xDSL communication.
Abstract
A digital subscriber line (xDSL) communication system (10) is disclosed that allows xDSL communication across a local loop. The system (10) includes a local loop termination point (14) and customer premises equipment (12) connected to a twisted pair telephone line (16). Loop integrity test devices (22, 24) for xDSL communication are located at the local loop termination point (14) and the customer premises equipment (12) and are coupled to the telephone line (16). The loop integrity test devices (22, 24) are respectively operable to transmit test signatures across the telephone line (16), to receive and evaluate test signatures from the telephone line (16), and to indicate whether the telephone line (16) can support xDSL communication based upon evaluation of test signatures.
Description
- This application is a continuation of U.S. application Ser. No. 08/929,778, filed Sep. 15, 1997, by James R. Sisk and John F. McHale, entitled “Loop Integrity Test Device and Method for Digital Subscriber Line (xDSL) Communication”.
- This invention relates in general to data communication, and more particularly to a loop integrity test device and method for digital subscriber line (xDSL) communication.
- Digital subscriber line (xDSL) communication can provide a high bandwidth data path supported by the twisted pair wiring infrastructure of the public switched telephone network (PSTN). xDSL technologies support data service simultaneously with traditional telephone service using a separation technique. Suitable xDSL technologies include asymmetric digital subscriber line (ADSL), rate adaptable digital subscriber line (RADSL), symmetric digital subscriber line (SDSL), high-speed digital subscriber line (HDSL) and very high-speed digital subscriber line (VDSL).
- In general, an xDSL communication link is established across the local loop between customer premises equipment (CPE) and the local loop termination point (e.g., central office or remote terminal). The local loop termination point typically has a xDSL access multiplexer (DSLAM) that handles the XDSL link on the network side, and the CPE typically includes one or more xDSL termination units (XTU) that handle the xDSL link on the customer premises side. One architecture for xDSL communication is disclosed in U.S. Pat. No. 5,668,857 (Ser. No. 08/625,769), filed Mar. 29, 1996, by John F. McHale, and entitled “Communication Server Apparatus and Method.”
- In order to support xDSL communication, the twisted pair line on the local loop between the customer premises and the loop termination point must meet certain physical characteristics. If it does not, an xDSL communication link can not be successfully established. Consequently, it can be desirable to allow the xDSL capability of the local loop to be quickly verified at the same time that xDSL service is installed at the customer premises. Further, it can be desirable to monitor the xDSL capability of the local loop on an ongoing and continuous basis.
- In accordance with the present invention, a loop integrity test device and method for digital subscriber line communication are disclosed that provide advantages over conventional xDSL communication devices and systems.
- According to one aspect of the present invention, a digital subscriber line (xDSL) communication system allows xDSL communication across a local loop. The system includes a local loop termination point and customer premises equipment connected to a twisted pair telephone line. Loop integrity test devices for xDSL communication are located at the local loop termination point and the customer premises equipment and are coupled to the telephone line. The loop integrity test devices are respectively operable to transmit test signatures across the telephone line, to receive and evaluate test signatures from the telephone line, and to indicate whether the telephone line can support xDSL communication based upon evaluation of test signatures.
- According to another aspect of the present invention, a loop integrity test device is disclosed that includes a line interface unit operable to connect to and interface with a twisted pair telephone line. The test device also includes an output device operable to indicate a pass state and a fail state. Further, the test device includes a control unit having a generation unit and an evaluation unit. The generation unit is operable to transmit a test signature across the telephone line. The evaluation unit is operable to receive and evaluate a test signature to determine whether the telephone line can support xDSL communication. The control unit is then operable to direct the output device to indicate a pass state if the telephone line can support DSL communication and to indicate a fail state if the telephone line can not support xDSL communication.
- A technical advantage of the present invention is that the integrity of the local loop can be verified at the time of installation of high speed xDSL data service at a customer premises. In particular, the present loop integrity test device provides an immediate indication of whether the loop can support xDSL communication when it is installed.
- Another technical advantage of the present invention is an improvement in the reliability and monitoring of the xDSL communication system. The test devices implement a continuous integrity check of the local loop that allows the telephone company or other service provider to be alerted to a problem on the local loop. This notification may allow the service provider to correct the problem before a degradation of service is noticed by the customer.
- Other technical advantages should be readily apparent to one skilled in the art from the following figures, description, and claims.
- For a more complete understanding of the present invention, and for further features and advantages, reference is now made to the following description taken in conjunction with the accompanying drawings, in which:
- FIG. 1 is a block diagram of one embodiment of an xDSL communication system having loop integrity test devices for xDSL communication according to the present invention;
- FIG. 2 is a block diagram of one embodiment of a loop integrity test device for xDSL communication according to the present invention; and
- FIG. 3 is a flow chart of a method for local loop integrity testing for xDSL communication according to the present invention.
- FIG. 1 is a block diagram of one embodiment of an xDSL communication system, indicated generally at10, having loop integrity test devices for xDSL communication according to the present invention.
System 10 includescustomer premises equipment 12 that can be located at any one of a number of customer premises.System 10 also includes a localloop termination point 14 which is connected tocustomer premises equipment 12 via a twistedpair telephone line 16.Customer premises equipment 12 typically includes a network interface device (NID) 18 which forms a physical interface between the customer premises and the telephone network as well as any other equipment located at the customer premises or other remote loop termination point. Localloop termination point 14 can be a central office, remote terminal or other appropriate termination of the local loop and can include an xDSL access multiplexer (DSLAM) 20 that provides xDSL high bandwidth data service.Telephone line 16 supports conventional voice traffic and is intended to support xDSL communications. However, depending upon physical characteristics oftelephone line 16, it may not support xDSL communication or may only support limited xDSL communication. For example, the distance of the local loop, any splices intelephone line 16, loading ontelephone line 16 and other physical characteristics affect the integrity oftelephone line 16 for xDSL communication. - According to the present invention, a loop
integrity test device 22 is located atcustomer premises equipment 12, and a loopintegrity test device 24 is located at localloop termination point 14. Both loopintegrity test devices telephone line 16. Loopintegrity test devices telephone line 16 and to receive and evaluate a test signature fromtelephone line 16. The test signature can be a signal with implanted high frequency tones, DC voltages or other distinctive characteristics and can be transmitted periodically at some time interval. For example, the test signature can be pulses, tones, modulated tones, xDSL symbols (e.g., Quadrature Amplitude Modulated (QAM) symbols or Discrete Multitone (DMT) symbols), or other xDSL physical layer symbols chosen to allow determination of the line characteristics and the ability of the line to support xDSL communication. Based upon evaluations of the test signature, loopintegrity test devices telephone line 16 can support DSL communication. In this manner, loopintegrity test devices - In one implementation, loop
integrity test devices 22 are installed in network interface device (NID) 18 at the customer premises. This is done for ease of installation by a service provider and to avoid interference with othercustomer premises equipment 12 located behind network interface device (NID) 18. Also, in this implementation,loop integrity device 24 is installed separate fromDSL access multiplexer 20 at localloop termination point 14. Similarly, this is done to avoid interference withDSL access multiplexer 20. It should be understood that other implementations are possible within the scope of the present invention. For example,loop integrity device 22 can be implemented as part of other equipment at the customer premises orloop termination point 14 such as part of an xDSL termination unit. - FIG. 2 is a block diagram of one embodiment of a loop integrity test device, indicated generally at30, for xDSL communication according to the present invention. As shown,
test device 30 can comprise aline interface unit 32 that connects to atelephone line 34. Line interface unit is coupled to acontrol unit 36 which can comprise a testsignature generation unit 38 and a testsignature evaluation unit 40.Control device 36 is, in turn, coupled to anoutput device 42.Output device 42 can, for example, comprise light emitting diode (LED) devices, an LCD display, a speaker, a register, an electronic signal output or a combination of thereof. - In operation,
line interface unit 32 provides an interface betweencontrol unit 36 andtelephone line 34.Control unit 36 manages the operation oftest device 30 and directsoutput device 42. Withincontrol unit 36,generation unit 38 periodically generates and transmits a test signature throughline interface unit 32 and acrosstelephone line 34.Generation unit 38 can, for example, generate a test signature by obtaining one from local storage or based upon a generation algorithm. Once generated, the test signature is transmitted to the opposite end point of the local loop. Whentest device 30 is located at a local loop termination unit, the test signature is transmitted to test devices located at customer premises. Conversely, whentest device 30 is located at the customer premises, the test signature is transmitted to the local loop termination equipment. The test signature is designed such that pertinent physical characteristics oftelephone line 34 can be determined from analysis of changes to the test signature after it has traveled acrosstelephone line 34. In general, xDSL communication is sensitive in that it uses higher frequencies across the twisted pair cooper lines, thus physical characteristics such as impedance and line length are important to the integrity oftelephone line 34. -
Evaluation unit 40 receives test signatures transmitted acrosstelephone line 34 and evaluates the test signatures to determine whethertelephone line 34 can support some level of xDSL communication. The evaluation can assess such things as loss of energy, change in bit stream pattern, and other changes of the test signature. Based upon analysis of the test signature,evaluation unit 40 identifies whethertelephone line 34 can support xDSL communication.Evaluation unit 40 can then directoutput device 42 to provide an indication based upon the results of the evaluation. In particular, iftelephone line 34 can support xDSL communication, then a pass state can be indicated. If not, then a fail state can be indicated. The indication can, for example, take the form of an audible alarm, a visual display, an electronic message or an electronic signal. In one implementation,output device 52 can provide an electronic flag to software such that automated loop monitoring can be established at the local loop termination point. - FIG. 3 is a flow chart of a method for local loop integrity testing for xDSL communication according to the present invention. As shown, in
step 50, a test signature is transmitted across the local loop telephone line to be tested. Instep 52, the test signature is received at the opposite end of the local loop. The received test signature is then evaluated, instep 54, to determine whether the telephone line can support xDSL communication. This determination is accomplished based upon changes to the test signature caused by transmission across the telephone line. Then, instep 56, an indication is made whether the telephone line can support xDSL communication. - According to the present invention, instant verification of loop integrity for xDSL communication across the local loop can be obtained at install time. This functionality can be accomplished using loop integrity test devices that can be loop powered. Once installed, the test devices can also provide continuous monitoring of the loop (i.e., twenty-four hours a day, seven days a week) and can provide both hardware and software alarms to the customer premises and to the service provider. The test devices are relatively low in cost and provide important qualification of the local loop for spectral compatibility and loop viability for xDSL communication.
- Although the present invention has been described with several embodiments, a myriad of changes, variations, alterations, transformations, and modifications may be suggested to one skilled in the art, and it is intended that the present invention encompass such changes, variations, alterations, transformations, and modifications as fall within the spirit and scope of the appended claims.
Claims (21)
1. A loop integrity test device for digital subscriber line (xDSL) communication systems, the test device comprising:
a line interface unit operable to connect to and interface with a first point on a twisted pair telephone line, the telephone line forming a continuous electrically conductive path without intermediate components between the first point and a second point;
an output device operable to indicate a pass state and a fail state; and
a control unit comprising:
a generation unit operable to transmit a first test signature across the telephone line for reception and evaluation at the second point, the transmission of the first test signature initiating a first loop integrity test; and
an evaluation unit operable to receive a second test signature transmitted across the telephone line, the second test signature originally generated independent of the first test signature by a second loop integrity test device to initiate a second loop integrity test, the evaluation unit further operable to evaluate the second test signature to determine whether the telephone line can support xDSL communication;
the control unit operable to direct the output device to indicate a pass state if the telephone line can support DSL communication and to indicate a fail state if the telephone line can not support xDSL communication.
2. The loop integrity test device of claim 1 , wherein the second loop integrity test device couples to the telephone line at the second point and is operable to complete the first loop integrity test by receiving and evaluating the first test signature and indicating whether the telephone line can support xDSL communication based upon evaluation of the first test signature and to independently initiate the second loop integrity test by transmitting the second test signature across the telephone line.
3. The loop integrity test device of claim 1 , wherein the evaluation unit is further operable to evaluate the second test signature to determine physical characteristics of the telephone line.
4. The loop integrity test device of claim 3 , wherein physical characteristics of the telephone line comprise impedance of the telephone line.
5. The loop integrity test device of claim 3 , wherein physical characteristics of the telephone line comprise length of the telephone line.
6. The loop integrity test device of claim 1 , wherein the evaluation unit is further operable to evaluate the second test signature to determine a loss of energy across the telephone line.
7. The test device of claim 1 , wherein the generation unit is further operable to generate the first test signature using an algorithm.
8. The test device of claim 1 , wherein the output device indicates the pass state and the fail state using at least one of a light emitting diode (LED) device, an audible alarm, an electronic register that can be accessed by software, and an electronic signal provided to another component.
9. The test device of claim 1 , wherein the line interface is further operable to draw power from the telephone line sufficient to operate the test device.
10. A method for local loop integrity testing of digital subscriber line (xDSL) communications, the method comprising:
initiating a test of a local loop telephone line by transmitting a test signature from a first point on the local loop telephone line, the local loop telephone line forming a continuous electrically conductive path without intermediate components between the first point and a second point;
receiving the test signature at the second point on the local loop telephone line;
evaluating the received test signature at the second point to determine whether the local loop telephone line can support xDSL communication; and
indicating whether the telephone line can support xDSL communication.
11. The method of claim 10 , wherein the test signature indicates initiation of the test to a device at the second point and provides sufficient information for the device to complete the test by indicating whether the telephone line can support xDSL communication.
12. The method of claim 10 , wherein evaluating is accomplished based upon changes to the test signature caused by transmission across the local loop telephone line.
13. The method of claim 10 , wherein evaluating the received test signature further comprises determining physical characteristics of the telephone line.
14. The method of claim 13 , wherein determining physical characteristics of the telephone line further comprises determining impedance of the telephone line.
15. The method of claim 13 , wherein determining physical characteristics of the telephone line further comprises determining length of the telephone line.
16. The method of claim 10 , wherein evaluating the received test signature further comprises determining a loss of energy across the telephone line.
17. The method of claim 10 , wherein indicating includes is at least one of providing a visual display of a pass state or a fail state, providing an electronic signal, and storing data in an electronic register.
18. A loop integrity test device for digital subscriber line (xDSL) communication systems, the test device comprising:
means for initiating a test of a local loop telephone line by transmitting a test signature from a first point on the local loop telephone line, the local loop telephone line forming a continuous electrically conductive path without intermediate components between the first point and a second point;
means for receiving the test signature at the second point on the local loop telephone line;
means for evaluating the received test signature at the second point to determine whether the local loop telephone line can support xDSL communication; and
means for indicating whether the telephone line can support xDSL communication.
19. The test device of claim 18 , wherein the test signature indicates initiation of the test to a device at the second point and provides sufficient information for completing the test by indicating whether the telephone line can support xDSL communication.
20. The test device of claim 18 , wherein the means for evaluating is operable to determine at least one of impedance of the telephone line, length of the telephone line, and a loss of energy across the telephone line.
21. A loop integrity test device for digital subscriber line (XDSL) communication systems, the test device comprising:
a line interface unit operable to connect to and interface with a first point on a twisted pair telephone line, the telephone line forming a continuous electrically conductive path without intermediate components between the first point and a second point;
an output device operable to indicate a pass state and a fail state; and
a control unit comprising:
a generation unit operable to transmit a first test signature across the telephone line for reception and evaluation at the second point by a second loop integrity test device, the transmission of the first test signature initiating a first loop integrity test, wherein the second loop integrity test device couples to the telephone line at the second point and is operable to complete the first loop integrity test by receiving and evaluating the first test signature and indicating whether the telephone line can support xDSL communication based upon evaluation of the first test signature; and
an evaluation unit operable to receive a second test signature transmitted across the telephone line, the second test signature originally generated independent of the first test signature by the second loop integrity test device to initiate a second loop integrity test independent of the first loop integrity test, the evaluation unit further operable to evaluate the second test signature to determine whether the telephone line can support xDSL communication;
the control unit operable to direct the output device to indicate a pass state if the telephone line can support DSL communication and to indicate a fail state if the telephone line can not support xDSL communication.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/047,529 US20020057763A1 (en) | 1997-09-15 | 2002-01-14 | Loop integrity test device and method for digital subscriber line (xDSL) communication |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/929,778 US6366644B1 (en) | 1997-09-15 | 1997-09-15 | Loop integrity test device and method for digital subscriber line (XDSL) communication |
US10/047,529 US20020057763A1 (en) | 1997-09-15 | 2002-01-14 | Loop integrity test device and method for digital subscriber line (xDSL) communication |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/929,778 Continuation US6366644B1 (en) | 1997-09-15 | 1997-09-15 | Loop integrity test device and method for digital subscriber line (XDSL) communication |
Publications (1)
Publication Number | Publication Date |
---|---|
US20020057763A1 true US20020057763A1 (en) | 2002-05-16 |
Family
ID=25458441
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/929,778 Expired - Lifetime US6366644B1 (en) | 1997-09-15 | 1997-09-15 | Loop integrity test device and method for digital subscriber line (XDSL) communication |
US10/047,529 Abandoned US20020057763A1 (en) | 1997-09-15 | 2002-01-14 | Loop integrity test device and method for digital subscriber line (xDSL) communication |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/929,778 Expired - Lifetime US6366644B1 (en) | 1997-09-15 | 1997-09-15 | Loop integrity test device and method for digital subscriber line (XDSL) communication |
Country Status (3)
Country | Link |
---|---|
US (2) | US6366644B1 (en) |
AU (1) | AU6775798A (en) |
WO (1) | WO1999014921A1 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050163286A1 (en) * | 2004-01-20 | 2005-07-28 | Sbc Knowledge Ventures, L.P. | Automated DSL performance adjustment |
US20050237940A1 (en) * | 2004-04-21 | 2005-10-27 | Bellsouth Intellectual Property Corporation | Adaptively applying a target noise margin to a DSL loop for DSL data rate establishment |
US20060198510A1 (en) * | 2003-01-30 | 2006-09-07 | Shinichi Sakamoto | Xdsl line quality control device, xdsl transmission method selection device, and xdsl line quality monitoring device |
US20070002758A1 (en) * | 2005-06-15 | 2007-01-04 | Blackburn Stuart Lynch | Methods and apparatus to determine digital subscriber line configuration parameters |
US20070274458A1 (en) * | 2004-01-05 | 2007-11-29 | Sbc Knowledge Ventures, Lp | Automated DSL performance adjustment |
US7349345B1 (en) * | 2002-05-31 | 2008-03-25 | Sprint Communications Company L.P. | Method and apparatus for testing communications between a network edge device and a customer premises device |
US20100142601A1 (en) * | 2006-12-07 | 2010-06-10 | Flowers Mark B | Dsl ring signal compatibility |
US9462101B2 (en) | 2014-12-15 | 2016-10-04 | At&T Intellectual Property I, L.P. | Methods and apparatus to electronically tag a circuit pair |
Families Citing this family (37)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6873652B1 (en) * | 1998-04-01 | 2005-03-29 | Panasonic Communications Co., Ltd. | Activation of multiple xDSL modems with implicit channel probe |
US6748078B1 (en) * | 1998-12-18 | 2004-06-08 | Lucent Technologies Inc. | System and method for allocating overhead voltage in the transmission of pots and XDSL signals |
US7003078B2 (en) * | 1999-01-29 | 2006-02-21 | Sbc Knowledge Ventures, Lp | Method and apparatus for telephone line testing |
US6895081B1 (en) * | 1999-04-20 | 2005-05-17 | Teradyne, Inc. | Predicting performance of telephone lines for data services |
GB2355361B (en) | 1999-06-23 | 2004-04-14 | Teradyne Inc | Qualifying telephone lines for data transmission |
US6687336B1 (en) * | 1999-09-30 | 2004-02-03 | Teradyne, Inc. | Line qualification with neural networks |
US6532277B2 (en) * | 1999-11-12 | 2003-03-11 | Qwest Communications International Inc. | Method for controlling DSL transmission power |
EP1111808A1 (en) * | 1999-12-21 | 2001-06-27 | Alcatel | Method and apparatus for determining properties of a transmission channel |
CA2788662C (en) | 2000-01-07 | 2017-01-03 | Aware, Inc. | Diagnostic methods and systems for multicarrier modems |
US6292540B1 (en) * | 2000-01-28 | 2001-09-18 | Turnstone Systems, Inc. | Battery injection and loop supervision for DSL environment |
US6741675B2 (en) | 2000-01-28 | 2004-05-25 | Turnstone Systems, Inc. | Method and apparatus for generating an audible tone in DSL environment |
GB0005227D0 (en) * | 2000-03-03 | 2000-04-26 | Teradyne Inc | Technique for estimatio of insertion loss |
ATE513401T1 (en) | 2000-04-18 | 2011-07-15 | Aware Inc | MULTI CARRIER SYSTEM WITH A MULTIPLE SNR SPACING |
US6574308B1 (en) * | 2000-05-09 | 2003-06-03 | Paradyne Corporation | Digital subscriber line diagnostic system |
US6584148B1 (en) * | 2000-06-02 | 2003-06-24 | Nokia Inc. | System and method for testing digital subscriber lines |
AU2001266691A1 (en) * | 2000-06-02 | 2001-12-11 | Nokia Inc. | System and method for testing digital subscriber lines |
AU2001269741A1 (en) * | 2000-06-02 | 2001-12-11 | Nokia Inc. | System and method for testing digital subscriber lines |
JP3781265B2 (en) * | 2000-06-19 | 2006-05-31 | 日本電気株式会社 | Subscriber circuit with splitter function |
GB2365253B (en) * | 2000-07-19 | 2004-06-16 | Teradyne Inc | Method of performing insertion loss estimation |
JP3570504B2 (en) * | 2000-08-30 | 2004-09-29 | 日本電気株式会社 | Condition monitoring method and device during subscriber line test |
US7042983B2 (en) * | 2000-10-19 | 2006-05-09 | Teradyne, Inc. | Method and apparatus for bridged tap impact analysis |
DE10107438A1 (en) * | 2001-02-16 | 2002-09-05 | Siemens Ag | Device and method for characterizing the transmission parameters of a transmission link for high bit rate data transmission |
US7782933B2 (en) * | 2001-05-08 | 2010-08-24 | Alistair Malcolm Macdonald | Digital subscriber line diagnostic system |
AU2002305771A1 (en) * | 2001-06-01 | 2002-12-16 | Dsltester, Inc. | Method and apparatus for determining distance qualification and electrical qualification of a telephone line for high speed communications |
US6978259B1 (en) * | 2001-10-23 | 2005-12-20 | Hewlett-Packard Development Company, L.P. | Automated system adaptation technique particularly for data storage systems |
EP1337092B1 (en) * | 2002-02-18 | 2007-04-11 | Siemens Schweiz AG | Monitoring method and splitter for network terminal equipment |
US7076030B2 (en) * | 2002-03-14 | 2006-07-11 | Westell Technologies, Inc. | Method and system for testing XDSL wiring |
EP1349355A1 (en) * | 2002-03-28 | 2003-10-01 | BRITISH TELECOMMUNICATIONS public limited company | Fault detection method and apparatus for telephone lines |
US6826258B2 (en) * | 2002-06-20 | 2004-11-30 | Teradyne, Inc. | System and method for pre-qualification of telephone lines for DSL service using an average loop loss |
US7386039B2 (en) * | 2003-09-26 | 2008-06-10 | Tollgrade Communications, Inc. | Method and apparatus for identifying faults in a broadband network |
CN1870611A (en) * | 2005-05-26 | 2006-11-29 | 华为技术有限公司 | Method and system for estimating channel property parameter |
US8189686B2 (en) | 2006-03-03 | 2012-05-29 | David John Boyes | Systems and methods for visualizing errors in video signals |
US7876815B2 (en) * | 2007-05-15 | 2011-01-25 | At&T Intellectual Property I, L.P. | Methods and apparatus to qualify a wire-pair for a digital subscriber line (DSL) service |
GB2452506B (en) * | 2007-09-05 | 2009-12-23 | Tyco Electronics | Xdsl bypass test facility |
US8369484B2 (en) | 2007-09-19 | 2013-02-05 | At&T Intellectual Property I, Lp | Methods and apparatus to test a subscriber line for a broadband access service |
US8300518B2 (en) | 2008-04-01 | 2012-10-30 | Alcatel Lucent | Fast seamless joining of channels in a multi-channel communication system |
US8515014B2 (en) * | 2009-11-30 | 2013-08-20 | At&T Intellectual Property I, L.P. | Methods, apparatus and articles of manufacture to characterize customer-premises networks |
Family Cites Families (113)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3532827A (en) | 1967-10-19 | 1970-10-06 | Bell Telephone Labor Inc | Scanner arrangement for identifying circuits changing their states,storing the times of such change,and determining the character of the change in a communication switching system |
US3821484A (en) | 1971-03-15 | 1974-06-28 | North Electric Co | Time sharing of a supervisory receiver unit |
US4002849A (en) | 1975-10-14 | 1977-01-11 | Gte Sylvania Incorporated | Scanning apparatus for detecting and analyzing supervisory and signaling information |
US4282408A (en) | 1979-10-25 | 1981-08-04 | Western Electric Company, Inc. | On-hook/off-hook detector circuit |
US4438511A (en) | 1980-11-10 | 1984-03-20 | Telebit Corporation | Packetized ensemble modem |
US4663775A (en) * | 1984-10-26 | 1987-05-05 | Teleprobe Systems Inc. | Method and apparatus for testing remote communication systems |
US4833706A (en) | 1985-05-20 | 1989-05-23 | Telebit Corporation | Ensemble modem structure for imperfect transmission media |
US5054034A (en) | 1985-05-20 | 1991-10-01 | Telebit Corporation | Ensemble modem structure for imperfect transmission media |
US4679227A (en) | 1985-05-20 | 1987-07-07 | Telebit Corporation | Ensemble modem structure for imperfect transmission media |
US4665514A (en) | 1985-08-02 | 1987-05-12 | American Telephone And Telegraph Company, At&T Bell Laboratories | Integrated voice/data network |
JPS6284646A (en) * | 1985-10-09 | 1987-04-18 | Fujitsu Ltd | Evaluation test system for transmission quality of digital subscriber line |
GB8530916D0 (en) | 1985-12-16 | 1986-01-29 | British Telecomm | Connecting modems to switched network |
US4757495A (en) | 1986-03-05 | 1988-07-12 | Telebit Corporation | Speech and data multiplexor optimized for use over impaired and bandwidth restricted analog channels |
JPS62222755A (en) * | 1986-03-10 | 1987-09-30 | Fujitsu Ltd | Digital subscriber line supervisory system |
US4841561A (en) | 1987-12-08 | 1989-06-20 | General Datacomm, Inc. | Operating default group selectable data communication equipment |
GB8802533D0 (en) | 1988-02-04 | 1988-03-02 | Plessey Co Plc | Data packet switching |
US4980897A (en) | 1988-08-12 | 1990-12-25 | Telebit Corporation | Multi-channel trellis encoder/decoder |
JPH0759011B2 (en) | 1988-09-27 | 1995-06-21 | エヌ・ティ・ティ・データ通信株式会社 | Modem mode matching apparatus and method for matching by PBX dial-in |
US5134611A (en) | 1988-09-30 | 1992-07-28 | Microcom, Inc. | Analog/digital data device and method |
US4949355A (en) | 1989-01-23 | 1990-08-14 | Rockwell International Corporation | Test access system for a digital loop carrier system |
US5128619A (en) * | 1989-04-03 | 1992-07-07 | Bjork Roger A | System and method of determining cable characteristics |
JPH02271763A (en) * | 1989-04-12 | 1990-11-06 | Nec Corp | Digital subscriber line quality monitor system |
JPH0710116B2 (en) | 1989-06-14 | 1995-02-01 | 松下電器産業株式会社 | Home bus system and equipment used for this system |
US5408527A (en) | 1989-06-28 | 1995-04-18 | Canon Kabushiki Kaisha | Exchange system and method of connecting calls in said exchange system |
US5066139A (en) * | 1989-08-28 | 1991-11-19 | Raynet Corporation | Coupler verification test circuit |
US5025469A (en) | 1990-02-06 | 1991-06-18 | Bingham John A C | Method and apparatus for reducing the turn-around time in facsimile transmission |
US5228062A (en) | 1990-04-16 | 1993-07-13 | Telebit Corporation | Method and apparatus for correcting for clock and carrier frequency offset, and phase jitter in multicarrier modems |
US5206886A (en) | 1990-04-16 | 1993-04-27 | Telebit Corporation | Method and apparatus for correcting for clock and carrier frequency offset, and phase jitter in mulicarrier modems |
JP2823320B2 (en) | 1990-05-23 | 1998-11-11 | 株式会社東芝 | Modem pooling system |
JP2766380B2 (en) | 1990-06-19 | 1998-06-18 | 株式会社東芝 | Modem pooling system |
JP2766382B2 (en) | 1990-06-19 | 1998-06-18 | 株式会社東芝 | Modem pooling system |
US5119402A (en) | 1990-06-26 | 1992-06-02 | Digital Equipment Corporation | Method and apparatus for transmission of local area network signals over unshielded twisted pairs |
JPH04100367A (en) * | 1990-08-17 | 1992-04-02 | Fujitsu Ltd | Digital subscriber line device test system |
US5111497A (en) * | 1990-09-17 | 1992-05-05 | Raychem Corporation | Alarm and test system for a digital added main line |
US5214650A (en) | 1990-11-19 | 1993-05-25 | Ag Communication Systems Corporation | Simultaneous voice and data system using the existing two-wire inter-face |
US5210530A (en) | 1991-01-04 | 1993-05-11 | Codex Corporation | Network management interface with internal dsd |
US5185763A (en) | 1991-04-09 | 1993-02-09 | Racal-Datacom, Inc. | Data bit to constellation symbol mapper |
US5222077A (en) | 1991-04-09 | 1993-06-22 | Racal-Datacom, Inc. | Radix mapping with variable number of symbols in mapping period |
US5119403A (en) | 1991-04-09 | 1992-06-02 | Racal Data Communications Inc. | Superframes |
US5293402A (en) | 1991-05-02 | 1994-03-08 | Bell Communications Research, Inc. | Wideband digital equalizers for subscriber loops |
US5444703A (en) | 1991-05-24 | 1995-08-22 | Gagliardi; Ugo O. | ISDN interfacing of personal computers |
FR2677831B1 (en) | 1991-06-17 | 1994-12-09 | Apple Computer | MODEM WITH AN IMPROVED LINE INTERFACE CIRCUIT, ESPECIALLY FOR A COMPUTER. |
US5202884A (en) | 1991-06-28 | 1993-04-13 | Digital Equipment Corporation | Multiplexing scheme for modem control signals |
US5434863A (en) | 1991-08-30 | 1995-07-18 | Hitachi, Ltd. | Internetworking apparatus for connecting plural network systems and communication network system composed of plural network systems mutually connected |
US5247347A (en) | 1991-09-27 | 1993-09-21 | Bell Atlantic Network Services, Inc. | Pstn architecture for video-on-demand services |
US5198818A (en) | 1991-11-07 | 1993-03-30 | Pairgain Technologies, Inc. | Oversampled digital-to-analog converter for multilevel data transmission |
US5367540A (en) | 1992-01-16 | 1994-11-22 | Fujitsu Limited | Transversal filter for use in a digital subscriber line transmission interface |
US5331670A (en) | 1992-01-31 | 1994-07-19 | At&T Bell Laboratories | Synchronization scheme for a digital communications system |
CA2092134C (en) | 1992-03-24 | 1998-07-21 | Anthony J. Mazzola | Distributed routing network element |
US5295159A (en) | 1992-04-17 | 1994-03-15 | Bell Communications Research, Inc. | Coordinated coding for digital transmission |
US5504736A (en) | 1992-05-11 | 1996-04-02 | At&T Corp. | Non-invasive link monitor |
JPH05316063A (en) | 1992-05-12 | 1993-11-26 | Fujitsu Ltd | Multiplex control system for frequency multiplexing modem |
US5371532A (en) | 1992-05-15 | 1994-12-06 | Bell Communications Research, Inc. | Communications architecture and method for distributing information services |
US5341474A (en) | 1992-05-15 | 1994-08-23 | Bell Communications Research, Inc. | Communications architecture and buffer for distributing information services |
US5285474A (en) | 1992-06-12 | 1994-02-08 | The Board Of Trustees Of The Leland Stanford, Junior University | Method for equalizing a multicarrier signal in a multicarrier communication system |
JPH066362A (en) | 1992-06-23 | 1994-01-14 | Hitachi Ltd | Message processing load distribution system for host system in lan |
ATE174180T1 (en) | 1992-07-30 | 1998-12-15 | Siemens Ag | CONTROL METHOD FOR A TEST SYSTEM |
US5410264A (en) | 1992-10-13 | 1995-04-25 | Bell Communications Research, Inc. | Adaptive impulse noise canceler for digital subscriber lines |
US5550836A (en) | 1992-11-06 | 1996-08-27 | Hewlett-Packard Company | High speed data transfer over twisted pair cabling |
US5438571A (en) | 1992-11-06 | 1995-08-01 | Hewlett-Packard Company | High speed data transfer over twisted pair cabling |
US5282155A (en) | 1992-11-19 | 1994-01-25 | Bell Communications Resarch, Inc. | Adaptive digital filter architecture for parallel output/update computations |
US5404388A (en) | 1993-03-03 | 1995-04-04 | Northern Telecom Limited | Digital measurement of amplitude and phase of a sinusoidal signal and detection of load coil based on said measurement |
US5479447A (en) | 1993-05-03 | 1995-12-26 | The Board Of Trustees Of The Leland Stanford, Junior University | Method and apparatus for adaptive, variable bandwidth, high-speed data transmission of a multicarrier signal over digital subscriber lines |
RO111887B1 (en) | 1993-05-28 | 1997-02-28 | Us West Technologies Inc | Method and network for the separation of telephonic services from special services |
US5440335A (en) | 1993-05-28 | 1995-08-08 | U S West Advanced Technologies, Inc. | Method and apparatus for delivering passband and telephony signals in a coaxial cable network |
US5442390A (en) | 1993-07-07 | 1995-08-15 | Digital Equipment Corporation | Video on demand with memory accessing and or like functions |
US5414455A (en) | 1993-07-07 | 1995-05-09 | Digital Equipment Corporation | Segmented video on demand system |
US5400322A (en) | 1993-08-20 | 1995-03-21 | Amati Communications Corp. | Updating of bit allocations in a multicarrier modulation transmission system |
JPH0774846A (en) | 1993-09-01 | 1995-03-17 | Fujitsu Ltd | Asymmetrical digital subscriber line control system |
US5422876A (en) | 1993-09-07 | 1995-06-06 | Southwestern Bell Technology Resources, Inc. | Out-of-band loopback control scheme |
US5452306A (en) | 1993-09-07 | 1995-09-19 | Southwestern Bell Technology Resources, Inc. | Out-of-band embedded overhead architecture for a transmission network |
US5412660A (en) | 1993-09-10 | 1995-05-02 | Trimble Navigation Limited | ISDN-to-ISDN communication via satellite microwave radio frequency communications link |
US5546383A (en) | 1993-09-30 | 1996-08-13 | Cooley; David M. | Modularly clustered radiotelephone system |
US5631897A (en) | 1993-10-01 | 1997-05-20 | Nec America, Inc. | Apparatus and method for incorporating a large number of destinations over circuit-switched wide area network connections |
WO1995015630A1 (en) * | 1993-11-30 | 1995-06-08 | Integrated Network Corporation | Network interface unit remote test pattern generation |
US5475735A (en) | 1993-12-02 | 1995-12-12 | Motorola, Inc. | Method of providing wireless local loop operation with local mobility for a subscribed unit |
US5408614A (en) | 1993-12-17 | 1995-04-18 | Xircom, Inc. | Modem adapter for use with standard PC parallel port |
US5414733A (en) | 1993-12-20 | 1995-05-09 | Adtran | Decision feedback equalizer employing fixed ratio postcursor taps for minimizing noise and intersymbol interference in signals conveyed over high speed data service loop |
CA2118277C (en) * | 1993-12-23 | 1998-09-22 | Alexander Feiner | Facility type determination technique |
US5513251A (en) | 1993-12-30 | 1996-04-30 | At&T Corp. | Method for providing call waiting service |
US5428608A (en) | 1993-12-30 | 1995-06-27 | At&T Corp. | Call connection technique |
US5408260A (en) | 1994-01-11 | 1995-04-18 | Northern Telecom Limited | Customer premises ADSL signal distribution arrangement |
US5528661A (en) * | 1994-02-09 | 1996-06-18 | Harris Corporation | Diagnostic mechanism for monitoring operational status of remote monitoring and test unit which controllably test and conditions subscriber line circuits |
US5737364A (en) | 1994-02-18 | 1998-04-07 | Telebit Corporation | Serial communications interface that supports multiple interface standards |
US5430793A (en) | 1994-02-25 | 1995-07-04 | Intel Corporation | Apparatus and method for configuring a computer system and a modem for use in a particular country |
US5461415A (en) | 1994-03-15 | 1995-10-24 | International Business Machines Corporation | Look-ahead scheduling to support video-on-demand applications |
US5453779A (en) | 1994-03-15 | 1995-09-26 | International Business Machines Corporation | Scheduling policies with grouping for providing VCR control functions in a video server |
US5390239A (en) | 1994-03-17 | 1995-02-14 | Morris; Gregory A. | Method for increasing digital data throughput over telephone lines |
GB9406212D0 (en) * | 1994-03-29 | 1994-05-18 | Plessey Telecomm | Telecommunication customer interface |
US5473599A (en) | 1994-04-22 | 1995-12-05 | Cisco Systems, Incorporated | Standby router protocol |
US5555244A (en) | 1994-05-19 | 1996-09-10 | Integrated Network Corporation | Scalable multimedia network |
US5477263A (en) | 1994-05-26 | 1995-12-19 | Bell Atlantic Network Services, Inc. | Method and apparatus for video on demand with fast forward, reverse and channel pause |
US5461640A (en) | 1994-06-03 | 1995-10-24 | Texas Instruments Incorporated | Method and system for optimizing an equalizer in a data transmission system |
US5526358A (en) | 1994-08-19 | 1996-06-11 | Peerlogic, Inc. | Node management in scalable distributed computing enviroment |
CA2159845A1 (en) | 1994-11-03 | 1996-05-04 | Bruce Lowell Hanson | Enabling technique for quickly establishing high speed pstn connections in telecommuting applications |
US5495483A (en) | 1995-01-26 | 1996-02-27 | Motorola, Inc. | Method and apparatus for allocating carrier channels |
US5604741A (en) | 1995-03-16 | 1997-02-18 | Broadcom Corporation | Ethernet system |
US5649001A (en) | 1995-03-24 | 1997-07-15 | U.S. Robotics Mobile Communications Corp. | Method and apparatus for adapting a communication interface device to multiple networks |
US5602902A (en) | 1995-03-24 | 1997-02-11 | Intel Corporation | Four wire modem signal switching for voice and data applications |
US5583862A (en) | 1995-03-28 | 1996-12-10 | Bay Networks, Inc. | Method and apparatus for routing for virtual networks |
US5574724A (en) | 1995-05-26 | 1996-11-12 | Lucent Technologies Inc. | Adjustment of call bandwidth during a communication call |
US5687176A (en) | 1995-06-09 | 1997-11-11 | Hubbell Incorporated | Zero byte substitution method and apparatus for telecommunications equipment |
US5812786A (en) | 1995-06-21 | 1998-09-22 | Bell Atlantic Network Services, Inc. | Variable rate and variable mode transmission system |
US5770950A (en) | 1995-09-28 | 1998-06-23 | Cisco Systems, Inc. | Minimizing signal reflection along a transmission line without terminating the transmission line |
US5756280A (en) | 1995-10-03 | 1998-05-26 | International Business Machines Corporation | Multimedia distribution network including video switch |
US5781617A (en) | 1996-03-29 | 1998-07-14 | Netspeed, Inc. | Communication server apparatus using frequency multiplexing and method |
US5668857A (en) | 1996-03-29 | 1997-09-16 | Netspeed, Inc. | Communication server apparatus and method |
US5852655A (en) | 1996-03-29 | 1998-12-22 | Cisco Systems, Inc. | Communication server apparatus having distributed switching and method |
US5818904A (en) * | 1996-10-09 | 1998-10-06 | Siemens Business Communication Systems, Inc. | Collaborative trunk testing method and system |
US5864602A (en) * | 1997-04-28 | 1999-01-26 | Nynex Science & Technologies, Inc. | Qualifying telephone line for digital transmission service |
US6002671A (en) * | 1997-09-03 | 1999-12-14 | Fluke Corporation | Test instrument for testing asymmetric digital subscriber lines |
US6278728B1 (en) * | 1998-03-18 | 2001-08-21 | Cisco Technology, Inc. | Remote XDSL transceiver unit and method of operation |
US6091713A (en) * | 1998-04-13 | 2000-07-18 | Telcordia Technologies, Inc. | Method and system for estimating the ability of a subscriber loop to support broadband services |
-
1997
- 1997-09-15 US US08/929,778 patent/US6366644B1/en not_active Expired - Lifetime
-
1998
- 1998-03-23 WO PCT/US1998/005930 patent/WO1999014921A1/en active Application Filing
- 1998-03-23 AU AU67757/98A patent/AU6775798A/en not_active Abandoned
-
2002
- 2002-01-14 US US10/047,529 patent/US20020057763A1/en not_active Abandoned
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8208385B1 (en) | 2002-05-31 | 2012-06-26 | Sprint Communications Company L.P. | Method and apparatus for testing communications between a network edge device and a customer premises device |
US7349345B1 (en) * | 2002-05-31 | 2008-03-25 | Sprint Communications Company L.P. | Method and apparatus for testing communications between a network edge device and a customer premises device |
US20060198510A1 (en) * | 2003-01-30 | 2006-09-07 | Shinichi Sakamoto | Xdsl line quality control device, xdsl transmission method selection device, and xdsl line quality monitoring device |
US20070274458A1 (en) * | 2004-01-05 | 2007-11-29 | Sbc Knowledge Ventures, Lp | Automated DSL performance adjustment |
US7920677B2 (en) | 2004-01-05 | 2011-04-05 | At&T Intellectual Property I, L.P. | Automated DSL performance adjustment |
WO2005072102A3 (en) * | 2004-01-20 | 2007-05-18 | Sbc Knowledge Ventures Lp | Automated dsl performance adjustment |
US20110142206A1 (en) * | 2004-01-20 | 2011-06-16 | At&T Intellectual Property I,L.P. | Automated DSL Performance Adjustment |
US20050163286A1 (en) * | 2004-01-20 | 2005-07-28 | Sbc Knowledge Ventures, L.P. | Automated DSL performance adjustment |
US8670525B2 (en) | 2004-01-20 | 2014-03-11 | At&T Intellectual Property I, L.P. | Automated DSL performance adjustment |
US7272209B2 (en) * | 2004-01-20 | 2007-09-18 | Sbc Knowledge Ventures, L.P. | Automated DSL performance adjustment |
US8451978B2 (en) | 2004-01-20 | 2013-05-28 | At&T Intellectual Property I, L.P. | Automated DSL performance adjustment |
WO2005072102A2 (en) * | 2004-01-20 | 2005-08-11 | Sbc Knowledge Ventures, L.P. | Automated dsl performance adjustment |
US7570599B2 (en) | 2004-04-21 | 2009-08-04 | At&T Intellectual Property I, Llp. | Adaptively applying a target noise margin to a digital subscriber line (DSL) loop for DSL data rate establishment |
US20050237940A1 (en) * | 2004-04-21 | 2005-10-27 | Bellsouth Intellectual Property Corporation | Adaptively applying a target noise margin to a DSL loop for DSL data rate establishment |
US7558213B2 (en) | 2005-06-15 | 2009-07-07 | AT&T Intellectual Property I, LLP | Methods and apparatus to determine digital subscriber line configuration parameters |
US7889671B2 (en) | 2005-06-15 | 2011-02-15 | At&T Intellectual Property I, L.P. | Methods and apparatus to determine digital subscriber line configuration parameters |
US20070002758A1 (en) * | 2005-06-15 | 2007-01-04 | Blackburn Stuart Lynch | Methods and apparatus to determine digital subscriber line configuration parameters |
US8363788B2 (en) * | 2006-12-07 | 2013-01-29 | Adaptive Spectrum And Signal Alignment, Inc. | DSL ring signal compatibility |
US20100142601A1 (en) * | 2006-12-07 | 2010-06-10 | Flowers Mark B | Dsl ring signal compatibility |
US9462101B2 (en) | 2014-12-15 | 2016-10-04 | At&T Intellectual Property I, L.P. | Methods and apparatus to electronically tag a circuit pair |
Also Published As
Publication number | Publication date |
---|---|
US6366644B1 (en) | 2002-04-02 |
WO1999014921A1 (en) | 1999-03-25 |
AU6775798A (en) | 1999-04-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6366644B1 (en) | Loop integrity test device and method for digital subscriber line (XDSL) communication | |
US9426282B2 (en) | Method and apparatus for transmission line testing | |
US6456694B1 (en) | Method for prequalifying subscriber lines for high speed data service | |
US6477238B1 (en) | Loop certification and measurement for ADSL | |
US7289604B2 (en) | System and method for subscriber loop testing | |
JP2002280998A (en) | Splitterless multicarrier modem | |
US20040066913A1 (en) | Dynamic, automated double-ended system and method for testing and qualifying metallic telecommunication loops | |
US20030190016A1 (en) | Digital subscriber line diagnostic system | |
EP2328333A1 (en) | Method for assessing dsl capability of telephone lines | |
US6819745B2 (en) | Method and apparatus of testing a POTS circuit and DSL circuit through a splitter | |
US6373923B1 (en) | Line testing method and apparatus therefor | |
US7453989B1 (en) | Method and apparatus for testing a subscriber loop-based service | |
US6725176B1 (en) | Loop diagnostics for ADSL systems | |
US6947441B1 (en) | Method and system for verifying spectral compatibility of digital subscriber line connections | |
US20020089999A1 (en) | Method for double-ended line qualification and monitoring of xDSL links | |
US6295339B1 (en) | Audio verification of digital subscriber line connection | |
EP1009156A2 (en) | Device and method for local power and signal feeding into subscriber lines | |
EP1760940A1 (en) | A method and system for determining channel performance | |
US20150043720A1 (en) | Apparatus, systems and methods of common-mode rejection ratio based diagnostics | |
US7426685B2 (en) | Device for controlling an xDSL communication line | |
US20080205285A1 (en) | Remote network element testing in a broadband communications network | |
US6519323B1 (en) | Test unit for use at a network interface device | |
WO2007118390A1 (en) | An emulation test device and method | |
US20150030139A1 (en) | Apparatus, systems and methods of common mode based diagnostics | |
US20090210554A1 (en) | Non intrusive control process for an XDSL type transmission line |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |