WO1998006186A1 - Reducing crosstalk between communications systems - Google Patents
Reducing crosstalk between communications systems Download PDFInfo
- Publication number
- WO1998006186A1 WO1998006186A1 PCT/CA1997/000022 CA9700022W WO9806186A1 WO 1998006186 A1 WO1998006186 A1 WO 1998006186A1 CA 9700022 W CA9700022 W CA 9700022W WO 9806186 A1 WO9806186 A1 WO 9806186A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- path
- signals
- communications
- crosstalk
- psd
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/32—Reducing cross-talk, e.g. by compensating
Definitions
- the at least one parameter that is adjusted to reduce PSD overlap can comprise the power (i.e. level), frequency band, and/or modulation scheme of signals supplied from the signal transmitter to the communications path. Desirably, all of these parameters are adjusted collectively to achieve minimal interference with existing communications systems consistent with optimal performance of the new communications system.
- Fig. 1 illustrates that over part of its length the line 10 may be in close proximity to another telephone line 16 which is used for high-speed communications between a modem 18 at the CO. end of the line 16 and a modem 20 at a subscriber end of this line.
- a line 22 represents other telephone lines which may or may not carry potentially interfering signals which would also be susceptible to interference.
- crosstalk undesirably can occur between these lines; i.e. signals on one line are coupled to some extent to the other line, the extent depending upon numerous factors such as the physical characteristics of the cable including these lines, and the levels and frequencies (i.e. the power spectral density) of the signals.
- Crosstalk is a pa ⁇ icular concern for high-speed transmission, i.e. where both lines carry signals at relatively high frequencies using similar or overlapping frequency bands.
- the addition of the modems 12 and 14 for high-speed communications via the line 10 is not a significant problem as far as crosstalk is concerned, because the majority of telephone lines do not also carry high frequency signals for high-speed transmission.
- the modem receiver performs a spectral analysis of any signals that may be received via the line 10.
- This spectral analysis is conveniently performed by controlling the bandwidth and centre frequency of a receive bandpass digital filter in the modem to receive signals within a narrow bandwidth that is progressively changed over a desired spectrum, for example 20 kHz to 1 MHz, while monitoring the power level of any signal that is received. It can be appreciated that any such signal will be predominantly a result of NEXT from signals on adjacent lines 16 and 22, and that the power spectrum that is constituted by this monitoring will represent the extent of the crosstalk and will be characteristic of the type of communications signals contributing to this crosstalk.
- the modulation method and signal bandwidth can be varied depending on errors to provide optimum communications capacity via any particular line, and a ratio of upstream to downstream frames can be varied depending on buffer fills at the modems.
- the master modem can be multiplexed for multiple lines.
- the modulated signal frequencies are above telephone signal frequencies so that each line can be frequency diplexed for simultaneous telephone communications.
- the master and slave modems buffer Ethernet frames to be communicated downstream (from the master modem 32 to the slave modem 34) and upstream (from the slave modem 34 to the master modem 32).
- the ECAP communications of the buffered Ethernet frames involves half-duplex transmission in which the master modem 32 has priority and control over the slave modem 34.
- the master modem 32 determines when to send information downstream via the line 10, and informs the slave modem 34 when it is permitted to send information upstream via the line 10.
- the information sent via the line 10 comprises not only the data packets of Ethernet frames but also control packets downstream and response packets upstream between the master and slave modems.
- the data and control packets are incorporated into ECAP frames which can take various forms.
- Upstream ECAP frames are received via the hybrid unit 50, converter 54, and DSP 56, with response information being supplied to the control unit 60 and Ethernet data frames being supplied via the buffer 58 to the Ethernet interface 52.
- ECAP frames on the line 10 are received via the hybrid unit 50, converter 54, and DSP 56, with control information supplied to the slave modem's control unit 60 and Ethernet data frames being supplied via the buffer 58 and Ethernet interface 52 to the terminal device 36.
- the control unit 60 in the slave modem controls transmission upstream of one or more frames containing response information and/or Ethernet data frames from the buffer 62 in the slave modem, as instructed by the master modem 32.
- control unit 60 of the master modem 32 adjusts (86) the configuration of its transmitter 64 in accordance with the PSD parameters provided, and sends (87) an Ethernet frame to the SCM 42 with a message confirming this adjustment. This is received (77) by the SCM 42, which returns to the step 70. Obviously, these steps of the SCM 42 can be carried out contemporaneously for many lines 10.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97900172A EP0916193B1 (en) | 1996-08-02 | 1997-01-15 | Reducing crosstalk between communications systems |
JP50740698A JP3184981B2 (en) | 1996-08-02 | 1997-01-15 | Reduction of crosstalk between communication systems |
CA002256898A CA2256898C (en) | 1996-08-02 | 1997-01-15 | Reducing crosstalk between communications systems |
DE69701989T DE69701989T2 (en) | 1996-08-02 | 1997-01-15 | REDUCING CROSS-CALL BETWEEN COMMUNICATION SYSTEMS |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/691,486 US6055297A (en) | 1996-08-02 | 1996-08-02 | Reducing crosstalk between communications systems |
US08/691,486 | 1996-08-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998006186A1 true WO1998006186A1 (en) | 1998-02-12 |
Family
ID=24776727
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CA1997/000022 WO1998006186A1 (en) | 1996-08-02 | 1997-01-15 | Reducing crosstalk between communications systems |
Country Status (6)
Country | Link |
---|---|
US (2) | US6055297A (en) |
EP (1) | EP0916193B1 (en) |
JP (1) | JP3184981B2 (en) |
CA (1) | CA2256898C (en) |
DE (1) | DE69701989T2 (en) |
WO (1) | WO1998006186A1 (en) |
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US6748016B1 (en) | 1999-07-16 | 2004-06-08 | Aware, Inc. | System and method for transmitting messages between transceivers using electromagnetically coupled signals |
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US7738354B2 (en) | 2000-08-03 | 2010-06-15 | Robert Hausman | Crosstalk identification for spectrum management in broadband telecommunications systems |
US8295151B2 (en) | 2007-03-23 | 2012-10-23 | Telefonaktiebolaget Lm Ericsson (Publ) | Method central unit, and modem in a digital subscriber line network |
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- 1997-01-15 EP EP97900172A patent/EP0916193B1/en not_active Expired - Lifetime
- 1997-01-15 CA CA002256898A patent/CA2256898C/en not_active Expired - Lifetime
- 1997-01-15 JP JP50740698A patent/JP3184981B2/en not_active Expired - Fee Related
- 1997-01-15 DE DE69701989T patent/DE69701989T2/en not_active Expired - Lifetime
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- 1999-03-01 US US09/259,681 patent/US6339613B2/en not_active Expired - Lifetime
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Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999023782A2 (en) * | 1997-10-31 | 1999-05-14 | Nortel Networks Corporation | Communications methods and apparatus |
WO1999023782A3 (en) * | 1997-10-31 | 1999-07-08 | Northern Telecom Ltd | Communications methods and apparatus |
EP0969605A2 (en) * | 1998-06-29 | 2000-01-05 | Texas Instruments Incorporated | Crosstalk reduction by shaping of transmit signals |
EP0969605A3 (en) * | 1998-06-29 | 2004-01-02 | Texas Instruments Incorporated | Crosstalk reduction by shaping of transmit signals |
US7649928B2 (en) | 1999-03-12 | 2010-01-19 | Tzannes Marcos C | Method for synchronizing seamless rate adaptation |
US6748016B1 (en) | 1999-07-16 | 2004-06-08 | Aware, Inc. | System and method for transmitting messages between transceivers using electromagnetically coupled signals |
EP1232637A1 (en) * | 1999-11-12 | 2002-08-21 | QWEST Communications International Inc. | Method for controlling dsl transmission power |
EP1232637A4 (en) * | 1999-11-12 | 2007-07-11 | Qwest Comm Int Inc | Method for controlling dsl transmission power |
KR100525379B1 (en) * | 2000-01-28 | 2005-11-02 | 엘지전자 주식회사 | Data collision avoidance method in Half Duplex Direct Memory Access logic |
US7738354B2 (en) | 2000-08-03 | 2010-06-15 | Robert Hausman | Crosstalk identification for spectrum management in broadband telecommunications systems |
EP1352493A4 (en) * | 2001-01-17 | 2006-01-04 | Telcordia Tech Inc | Crosstalk identification for spectrum management in broadband telecommunications systems |
EP1352493A1 (en) * | 2001-01-17 | 2003-10-15 | Telcordia Technologies, Inc. | Crosstalk identification for spectrum management in broadband telecommunications systems |
EP1413121A4 (en) * | 2001-07-31 | 2006-01-11 | Telcordia Tech Inc | Improved crosstalk identification for spectrum management in broadband telecommunications systems |
US8477590B2 (en) | 2001-07-31 | 2013-07-02 | Intellectual Ventures Ii Llc | Crosstalk identification for spectrum management in broadband telecommunications systems |
EP1413121A1 (en) * | 2001-07-31 | 2004-04-28 | Telcordia Technologies, Inc. | Improved crosstalk identification for spectrum management in broadband telecommunications systems |
GB2407005A (en) * | 2003-10-07 | 2005-04-13 | Roke Manor Research | Controlling interference from a transmitter in one communication system to a receiver in another communication system |
US7848730B2 (en) | 2003-10-07 | 2010-12-07 | Roke Manor Research Limited | Method of controlling interference from a transmitter in one communication system to a receiver in another communication system |
GB2407005B (en) * | 2003-10-07 | 2006-02-01 | Roke Manor Research | A method of controlling interference from a transmitter in one communication system to a receiver in another communication system |
US8295151B2 (en) | 2007-03-23 | 2012-10-23 | Telefonaktiebolaget Lm Ericsson (Publ) | Method central unit, and modem in a digital subscriber line network |
Also Published As
Publication number | Publication date |
---|---|
US6055297A (en) | 2000-04-25 |
DE69701989D1 (en) | 2000-06-15 |
JP2000500948A (en) | 2000-01-25 |
CA2256898C (en) | 2002-04-02 |
US20010012321A1 (en) | 2001-08-09 |
CA2256898A1 (en) | 1998-02-12 |
DE69701989T2 (en) | 2000-08-17 |
EP0916193A1 (en) | 1999-05-19 |
EP0916193B1 (en) | 2000-05-10 |
US6339613B2 (en) | 2002-01-15 |
JP3184981B2 (en) | 2001-07-09 |
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