|Numéro de publication||USRE41052 E1|
|Type de publication||Octroi|
|Numéro de demande||US 11/732,104|
|Date de publication||22 déc. 2009|
|Date de dépôt||2 avr. 2007|
|Date de priorité||20 août 1999|
|État de paiement des frais||Payé|
|Numéro de publication||11732104, 732104, US RE41052 E1, US RE41052E1, US-E1-RE41052, USRE41052 E1, USRE41052E1|
|Cessionnaire d'origine||Adc Telecommunications, Inc.|
|Exporter la citation||BiBTeX, EndNote, RefMan|
|Citations de brevets (73), Citations hors brevets (2), Référencé par (6), Classifications (4), Événements juridiques (5)|
|Liens externes: USPTO, Cession USPTO, Espacenet|
This application is a continuation of application Ser. No. 09/378,105, filed Aug. 20, 1999 now Pat. No. 6,089,923 which application(s) are incorporated herein by reference.Notice: More than one reissue application has been filed for the reissue of U.S. Pat. No. 6,428,362. The reissue patent applications include the present application and patent application Ser. No. 11/253,281, filed Oct. 17, 2005. The present application is a continuation of patent application Ser. No. 11/253,281. U.S. Pat. No. 6,428,362 is a continuation of patent application Ser. No. 09/378,105, filed Aug. 20, 1999, now U.S. Pat. No. 6,089,923. The above noted applications are incorporated into the present application by reference.
The present invention relates to electrical connectors, and specifically to electrical connectors having closely spaced contacts and printed circuit boards where interference from crosstalk in the connector is a concern.
Various electrical connectors are known for use in the telecommunications industry to transmit voice, data, and video signals. It is common for some electrical connectors to be configured to include a plug which is connectable to a jack mounted in the wall, or as part of a panel or other telecommunications equipment mounted to a rack or cabinet. The jack includes a housing which holds a plurality of closely spaced contact springs in the appropriate position for contacting the contacts of a plug inserted into the jack. The contact springs of the jack are often mounted to a printed circuit board, either vertically or horizontally. An RJ45 plug and jack connector system is one well known standard including closely spaced contacts.
Crosstalk between the contacts and circuit pathways in telecommunications connectors is a concern. U.S. Pat. Nos. 5,299,956 and 5,700,167 are examples of various connectors including jacks and plugs which attempt to address the problem of crosstalk in the circuit board. It is desired to improve performance of the electrical connectors, such as an RJ45 connector, where crosstalk problems increase as higher frequencies are transmitted through the connector.
Most of the crosstalk problems occurring in a connector, such as an RJ45 connector, is mainly caused by the plug. This crosstalk is produced by the non-periodic or random discharges of crosstalk energy due to the imbalanced capacitance and/or inductance in the plug and the contact springs of a jack. RJ45 types of connectors are mainly used with balanced twisted pairs of conductors or wires. There is no grounding to shield the crosstalk energy.
One of the known techniques commonly used to solve the crosstalk problem in a connector is to balance the capacitance on the printed circuit board or on a substrate of the connector to minimize or eliminate the leaking energies from the unbalanced capacitance. The known method of reducing crosstalk generally includes forming of a capacitor by using two parallel conductive lines or wires and inducing electro-magnetic field to compensate the lesser field produced by the capacitive imbalance in the plug. This method is often referred to as capacitance balancing or capacitive compensation. The known compensation technique is applied at the nearest unbalanced components, which are the contact springs of a jack and the mated RJ45 plug. This technique is very useful for the TIA/EIA category 5 and Enhanced category 5 (5E) connector. However, the crosstalk performance of these connectors is rated only up to 100 MHz. Higher frequencies are in demand in the telecommunication and data transmission industry. The TIA/EIA category 6 connector standards have been proposed to meet the demand. Under the proposed category 6 standards, the connector is required to meet the crosstalk specifications up to 250 MHz, which is about 150% more bandwidth than the category 5's.
In order to meet this specifications, additional compensations or additional parallel conductive lines are needed to be placed on the circuit board at the nearest unbalanced components. It has been found that capacitive compensation only worsens the directivity or equal-level of the far-end crosstalk (FEXT) of the connector because the capacitor formed by two conductive lines has an inductive effect which is not accountable for. Also, it has been found that the additional compensation has a reverse capacitive effect on the near-end crosstalk (NEXT) of the connector. Generally, the far end and the near end are defined according to the two ends of the printed circuit board. The end to which signals are being injected is the near end. The opposite is the far end.
In addition, the natural crosstalk characteristic for short transmission lines, i.e. −20 dB per frequency decade, will be lost if the connector is heavily compensated. This natural crosstalk characteristic is generally required to be maintained in order for a connector to meet the category 6 crosstalk specifications.
Accordingly, the known compensation technique is either insufficient to compensate the crosstalk, or problematic by overcompensating for the crosstalk. The known compensation technique has been considered ineffective when applied to the development of a category 6 or a category 6 type of connector, and particularly, it is unable to meet the crosstalk specifications up to 250 MHz.
Thus, there is a need for a connector including an improved crosstalk compensation technique for a printed circuit board. Further, there is a need for a connector with balanced capacitance and/or inductance on the printed circuit board to minimize or eliminate crosstalk in the connector.
The present invention provides a method of compensating crosstalk for a printed circuit board of a connector. The present invention also provides a connector including such crosstalk compensation method.
The present method of compensating crosstalk for a printed circuit board includes a forward compensation process and a reverse compensation process. The forward compensation process compensates capacitively for the unbalanced capacitance in the plug by forming capacitors, for example, using the parallel conductive lines or wires on the printed circuit board. The reverse compensation process can be used to compensate the unbalanced capacitance and inductance caused by the forward compensations in the same pair combination of the connector. In other words, the reverse compensation negates the forward compensation at the far-end of the printed circuit board by forming capacitors, for example, using the parallel conductive lines or wires, at the far-end of the printed circuit board.
In one aspect of the present invention, the method of compensating crosstalk in a connector arrangement includes: providing a plurality of pairs of conductors on a printed circuit board, the pairs of conductors connecting to respective front and rear terminals, each pair of conductors including a ring conductor and a tip conductor, and the ring and tip conductors being substantially disposed in parallel to control the transmission line impedence; sending electrical signals between the front and rear terminals; generating forward-compensating capacitance, induced between two of the pairs of conductors, proximate the respective front terminals by providing a first capacitor between a first conductor of the first pair and a second conductor of the second pair and providing a second capacitor between a second conductor of the first pair and a first conductor of the second pair; and generating reverse-compensating capacitance/inductance to compensate the unbalanced capacitance/inductance induced between the two pairs of conductors by the first and second capacitors at the front terminal. The reverse-compensating capacitance/inductance is disposed proximate the rear terminals by providing a third capacitor between the first conductor of the first pair and the first conductor of the second pair and providing a fourth capacitor between the second conductor of the first pair and the second conductor of the second pair.
Accordingly, unbalanced capacitance/inductance, induced between the two pairs of conductors on the printed circuit board is compensated by the first, second, third, and fourth capacitors.
In one aspect of the present invention, the capacitance/inductance of the same two pairs of conductors is compensated at the opposite terminals in the reverse compensation process.
In another aspect of the present invention, the forward-reverse compensation technique can also be applied to minimize or eliminate crosstalk induced between any other combinations of two pairs of conductors on the printed circuit board.
One of the advantages of the forward-reverse compensation technique is that by reversing the compensations of ones at the opposite terminals, both the far-end crosstalk performance and the near-end crosstalk performance are improved. The inductance effect resulted from forming the capacitors at the front terminals of the printed circuit board of the connector is also balanced.
These and various other features as well as advantages that characterize the present invention will be apparent upon reading of the following detailed description and review of the associated drawings.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate several aspects of the invention and together with the description, serve to explain the principles of the invention. A brief description of the drawings is as follows:
Reference will now be made in detail to exemplary aspects of the present invention that are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.
As shown in the illustrated preferred embodiment, the jack 26 and plug 32 is an 8 contact type (i.e., 4 twisted pair) connector arrangement. While the various aspects of the present invention are particularly useful for 8 contact modular connectors, it will be appreciated that other types of connectors could also be used.
Referring also to
The jack 26 includes a front jack housing 54, and a rear insert assembly 56 in the illustrated preferred embodiment. The jack housing 54 is adapted to be snap-fit into a face plate, panel, or other mounting arrangement.
The insert assembly 56 is adapted to snap fit within a back side 61 of the housing 54. The insert assembly 56 includes a connector mount 66, a plurality of insulation displacement terminals 68, a termination cap 70, the circuit board 40, and the contact springs 34 (e.g., eight contact springs) mounted on the circuit board 40. When assembled, the insulation displacement terminals 68 and the termination cap 70 mount at a top side of the connector mount 66, while the circuit board 40 mounts to a bottom side of the connector mount 66. As so assembled, the contact springs 34 project upward between resilient locking tabs 76 (only one shown) of the connector mount 66. The locking tabs 76 are adapted to snap fit within corresponding openings 78 defined by the housing 54. Further detail relating to an exemplary housing and connector mount suitable for practicing the present invention are disclosed in U.S. patent application Ser. No. 09/327,053, filed Jun. 7, 1999 that is hereby incorporated by reference. Details relating to contact spring configurations suitable for use with the present invention are disclosed in U.S. patent application Ser. No. 09/378,404, which is entitled Telecommunications Connector for High Frequency Transmissions, which was filed on a date concurrent with the filing date of this application, and which is hereby incorporated by reference. Other spring configurations are possible, such as those shown in U.S. patent application Ser. No. 09/231,736, filed Jan. 15, 1999 hereby incorporated by reference. Other spring configurations are possible for use with circuit board 40, as desired. Further, front terminals 46 are shown in 3 rows across board 40 in the preferred embodiment. Other arrangements are possible such as more or less rows.
In a typical terminal pin assignments, such as in a RJ45 connector, best shown in
In addition, in
The forward compensation is illustrated in FIG. 18. At the front portion 42 of the connector, a capacitor C35′ is added in dashed lines between terminals 46-3 and 46-5, such that the capacitance between terminals 46-3 and 46-4 and the capacitance between terminals 46-3 and 46-5 are balanced.
As shown in
As shown in
Also as shown in
The compensating conductive lines 52 are terminated on the isolation displacement contacts with a preferable 100 Ohm resistor as generally specified in the industry. It is appreciated that other resistance can be used at the terminal within the scope of the present invention. Further, the shape or type of compensating capacitors can be varied. For example, C64′, C35′, C34′, C64″, and C35″ are capacitors formed on the same layer as shown in
In a preferred printed circuit board arrangement, the layer shown in
Accordingly, by reversing the compensations of ones at opposite terminals, i.e. at the rear portion 44, the forward-reverse compensation processes allow the capacitance/inductance induced between pair I and pair II to be balanced on the printed circuit board. As a result, crosstalk caused by the imbalanced capacitance/inductance of pair I and pair II is minimized or eliminated.
It is appreciated that the imbalance capacitance/inductance caused by the other pair combinations, such as the other five pair combinations shown in
The capacitors for pair combinations (except pair combination III/IV) are 52-C46′, 52-C68′, 52-C25′, 52-C65′, 52-C67′, and 52-C67″ as shown in
In a preferred embodiment, the layer shown in
It will be appreciated that the forward-reverse compensating technique can also be used to compensate unbalanced inductance in the plug and/or contact springs by forming additional capacitors in the reverse compensation process.
It will also be appreciated that other types of electro-magnetic field can be used to compensate unbalanced capacitance/inductance on the printed circuit board. For example, the electro-magnetic field can be a combination of capacitor and inductor.
It is further appreciated that the capacitors and/or inductors used in the forward-reverse compensation technique can be implemented in other parts of the connector, i.e. not necessarily on the printed circuit board, without departing from the principles of the present invention.
The forward-reverse crosstalk compensation technique of the present invention significantly improves the near-end as well as the far-end crosstalk performance. For example, the near-end crosstalk can be as low as −64 dB at 100 MHz frequency and as low as −48 at 250 MHz frequency. The far-end crosstalk can be as low as −52 dB at 100 MHz frequency and as low as −44 dB at 250 MHz.
The above specification, examples and data provide a complete description of the manufacture and use of the composition of the invention. Since many embodiments of the invention can be made without departing from the spirit and scope of the invention, the invention resides in the claims hereinafter appended.
|Brevet cité||Date de dépôt||Date de publication||Déposant||Titre|
|US2943272||2 janv. 1958||28 juin 1960||Feldman Nathan W||Crosstalk cancellation in signal communication system|
|US3757028||18 sept. 1972||4 sept. 1973||J Schlessel||Terference printed board and similar transmission line structure for reducing in|
|US3849600||11 oct. 1973||19 nov. 1974||Sony Corp||Stereophonic signal reproducing apparatus|
|US3891815||17 avr. 1973||24 juin 1975||Philips Corp||Printed circuit board for a switching network|
|US3946165||9 mai 1974||23 mars 1976||Cooper Duane H||Method and apparatus for control of crosstalk in multiple frequency recording|
|US4274691||31 déc. 1979||23 juin 1981||Amp Incorporated||Modular jack|
|US4406509||25 nov. 1981||27 sept. 1983||E. I. Du Pont De Nemours & Co.||Jack and plug electrical assembly|
|US4698025||15 sept. 1986||6 oct. 1987||Molex Incorporated||Low profile modular phone jack assembly|
|US4767338||20 avr. 1987||30 août 1988||Dennis Melburn W||Printed circuit board telephone interface|
|US4831497||11 sept. 1986||16 mai 1989||General Electric Company||Reduction of cross talk in interconnecting conductors|
|US5030123||18 juin 1990||9 juil. 1991||Adc Telecommunications, Inc.||Connector and patch panel for digital video and data|
|US5071371||30 mars 1990||10 déc. 1991||Molex Incorporated||Electrical card edge connector assembly|
|US5091826||27 mars 1990||25 févr. 1992||At&T Bell Laboratories||Printed wiring board connector|
|US5156554||22 juil. 1991||20 oct. 1992||Itt Corporation||Connector interceptor plate arrangement|
|US5178554||5 août 1991||12 janv. 1993||The Siemon Company||Modular jack patching device|
|US5186647||24 févr. 1992||16 févr. 1993||At&T Bell Laboratories||High frequency electrical connector|
|US5238426||11 juin 1992||24 août 1993||At&T Bell Laboratories||Universal patch panel for communications use in buildings|
|US5269708||3 mars 1993||14 déc. 1993||Adc Telecommunications, Inc.||Patch panel for high speed twisted pair|
|US5299956||23 mars 1992||5 avr. 1994||Superior Modular Products, Inc.||Low cross talk electrical connector system|
|US5310363||25 mai 1993||10 mai 1994||Superior Modular Products Incorporated||Impedance matched reduced cross talk electrical connector system|
|US5326284||26 juin 1992||5 juil. 1994||Northern Telecom Limited||Circuit assemblies of printed circuit boards and telecommunications connectors|
|US5362254||14 sept. 1993||8 nov. 1994||The Siemon Company||Electrically balanced connector assembly|
|US5362257||8 juil. 1993||8 nov. 1994||The Whitaker Corporation||Communications connector terminal arrays having noise cancelling capabilities|
|US5399107||2 mai 1994||21 mars 1995||Hubbell Incorporated||Modular jack with enhanced crosstalk performance|
|US5414393||15 janv. 1993||9 mai 1995||Hubbell Incorporated||Telecommunication connector with feedback|
|US5432484||20 août 1992||11 juil. 1995||Hubbell Incorporated||Connector for communication systems with cancelled crosstalk|
|US5454738||25 mai 1994||3 oct. 1995||Thomas & Betts Corporation||Electrical connector having reduced cross-talk|
|US5459643||22 nov. 1994||17 oct. 1995||The Siemon Company||Electrically enhanced wiring block with break test capability|
|US5474474||13 mai 1994||12 déc. 1995||The Siemon Company||Electrically balanced connector assembly|
|US5488201||16 déc. 1994||30 janv. 1996||Dan-Chief Enterprise Co., Ltd.||Low crosstalk electrical signal transmission medium|
|US5547405||23 sept. 1994||20 août 1996||Itt Industries Limited||Crosstalk suppressing connector|
|US5562479||21 juin 1994||8 oct. 1996||At&T Corp.||Connector for unshielded twisted wire pair cables|
|US5580257||28 avr. 1995||3 déc. 1996||Molex Incorporated||High performance card edge connector|
|US5580270||11 mai 1995||3 déc. 1996||Krone Ag||Electrical plug connector|
|US5586914||19 mai 1995||24 déc. 1996||The Whitaker Corporation||Electrical connector and an associated method for compensating for crosstalk between a plurality of conductors|
|US5626497||12 juin 1995||6 mai 1997||Molex Incorporated||Modular jack type connector|
|US5628647||22 févr. 1995||13 mai 1997||Stewart Connector Systems, Inc.||High frequency modular plug and cable assembly|
|US5639266||21 oct. 1994||17 juin 1997||Stewart Connector Systems, Inc.||High frequency electrical connector|
|US5663870||14 juil. 1995||2 sept. 1997||Krone Aktiengesellschaft||Printed circuit board for connectors|
|US5673009||31 juil. 1995||30 sept. 1997||Hubbell Incorporated||Connector for communication systems with cancelled crosstalk|
|US5674093||23 juil. 1996||7 oct. 1997||Superior Modular Process Incorporated||Reduced cross talk electrical connector|
|US5679027||31 août 1993||21 oct. 1997||Pressac Ltd.||Apparatus for crosstalk cancellation in data connectors|
|US5700167||6 sept. 1996||23 déc. 1997||Lucent Technologies||Connector cross-talk compensation|
|US5713764||3 nov. 1995||3 févr. 1998||Molex Incorporated||Impedance and inductance control in electrical connectors|
|US5716237||21 juin 1996||10 févr. 1998||Lucent Technologies Inc.||Electrical connector with crosstalk compensation|
|US5735714||6 avr. 1995||7 avr. 1998||Ortronics Inc.||Information management outlet module and assembly providing protection to exposed cabling|
|US5759070||2 mai 1996||2 juin 1998||Berg Technology, Inc.||Modular jack insert|
|US5779503||18 déc. 1996||14 juil. 1998||Nordx/Cdt, Inc.||High frequency connector with noise cancelling characteristics|
|US5791943||22 nov. 1995||11 août 1998||The Siemon Company||Reduced crosstalk modular outlet|
|US5797764||12 févr. 1997||25 août 1998||Homaco, Inc.||Low return loss and low crosstalk telecommunications electric circuit|
|US5864089||14 nov. 1997||26 janv. 1999||Lucent Technologies Inc.||Low-crosstalk modular electrical connector assembly|
|US5911602||18 juil. 1997||15 juin 1999||Superior Modular Products Incorporated||Reduced cross talk electrical connector|
|US5913702||2 août 1995||22 juin 1999||Framatome Connectors International||Low cross-talk network connector|
|US5931703||4 févr. 1997||3 août 1999||Hubbell Incorporated||Low crosstalk noise connector for telecommunication systems|
|US5938479||2 avr. 1997||17 août 1999||Communications Systems, Inc.||Connector for reducing electromagnetic field coupling|
|US5940959||26 avr. 1996||24 août 1999||Panduit Corp.||Communication connector with capacitor label|
|US5941734||26 déc. 1996||24 août 1999||Matsushita Electric Works, Ltd.||Connector|
|US5967853||24 juin 1997||19 oct. 1999||Lucent Technologies Inc.||Crosstalk compensation for electrical connectors|
|US5997358||2 sept. 1997||7 déc. 1999||Lucent Technologies Inc.||Electrical connector having time-delayed signal compensation|
|US6007368||18 nov. 1997||28 déc. 1999||Leviton Manufacturing Company, Inc.||Telecommunications connector with improved crosstalk reduction|
|US6023200||9 mars 1998||8 févr. 2000||Dae Eun Electric Co., Ltd.||Apparatus for inhibiting cross talk under a difference mode|
|US6057512||26 déc. 1997||2 mai 2000||Molex Incorporated||Flexible printed circuitry with pseudo-twisted conductors|
|US6057743||22 juin 1998||2 mai 2000||Hubbell Incorporation||Distributed noise reduction circuits in telecommunication system connector|
|US6065994||19 mai 1997||23 mai 2000||Lucent Technologies Inc.||Low-crosstalk electrical connector grouping like conductors together|
|US6086428||25 mars 1998||11 juil. 2000||Lucent Technologies Inc.||Crosstalk compensation for connector jack|
|US6116964||8 mars 1999||12 sept. 2000||Lucent Technologies Inc.||High frequency communications connector assembly with crosstalk compensation|
|US6186834 *||8 juin 1999||13 févr. 2001||Avaya Technology Corp.||Enhanced communication connector assembly with crosstalk compensation|
|USRE39546 *||17 oct. 2005||3 avr. 2007||Adc Telecommunications, Inc.||Jack including crosstalk compensation for printed circuit board|
|GB1382013A||Titre non disponible|
|GB2271678A||Titre non disponible|
|GB2273397B||Titre non disponible|
|GB2314466A||Titre non disponible|
|WO1996037017A1||4 avr. 1996||21 nov. 1996||The Whitaker Corporation||An electrical connector and an associated method for compensating for crosstalk between a plurality of conductors|
|1||Notification of Transmittal of the International Preliminary Examination Report, 18 pages, dated Nov. 28, 2001.|
|2||The Siemon Company Catalog pages-front cover page through p. 139, and back cover page, dated 1999.|
|Brevet citant||Date de dépôt||Date de publication||Déposant||Titre|
|US8128433 *||14 nov. 2006||6 mars 2012||Molex Incorporated||Modular jack having a cross talk compensation circuit and robust receptacle terminals|
|US8287317 *||11 janv. 2012||16 oct. 2012||Panduit Corp.||High-speed connector with multi-stage compensation|
|US20110097935 *||14 nov. 2006||28 avr. 2011||Molex Incorporated||Modular jack having a cross talk compensation circuit and robust receptacle terminals|
|US20120190240 *||11 janv. 2012||26 juil. 2012||Panduit Corp.||High-Speed Connector with Multi-Stage Compensation|
|USRE43366 *||11 août 2010||8 mai 2012||Adc Telecommunications, Inc.||Jack including crosstalk compensation for printed circuit board|
|USRE44961||4 mai 2012||24 juin 2014||Adc Telecommunications, Inc.||Jack including crosstalk compensation for printed circuit board|
|Classification aux États-Unis||439/676, 333/1, 439/941|
|8 févr. 2010||FPAY||Fee payment|
Year of fee payment: 8
|6 juil. 2015||AS||Assignment|
Owner name: TYCO ELECTRONICS SERVICES GMBH, SWITZERLAND
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ADC TELECOMMUNICATIONS, INC.;REEL/FRAME:036060/0174
Effective date: 20110930
|26 oct. 2015||AS||Assignment|
Owner name: COMMSCOPE EMEA LIMITED, IRELAND
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TYCO ELECTRONICS SERVICES GMBH;REEL/FRAME:036956/0001
Effective date: 20150828
|29 oct. 2015||AS||Assignment|
Owner name: COMMSCOPE TECHNOLOGIES LLC, NORTH CAROLINA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:COMMSCOPE EMEA LIMITED;REEL/FRAME:037012/0001
Effective date: 20150828
|13 janv. 2016||AS||Assignment|
Owner name: JPMORGAN CHASE BANK, N.A., AS COLLATERAL AGENT, IL
Free format text: PATENT SECURITY AGREEMENT (TERM);ASSIGNOR:COMMSCOPE TECHNOLOGIES LLC;REEL/FRAME:037513/0709
Effective date: 20151220
Owner name: JPMORGAN CHASE BANK, N.A., AS COLLATERAL AGENT, IL
Free format text: PATENT SECURITY AGREEMENT (ABL);ASSIGNOR:COMMSCOPE TECHNOLOGIES LLC;REEL/FRAME:037514/0196
Effective date: 20151220