GB1433576A - Time-division multiplex system - Google Patents

Time-division multiplex system

Info

Publication number
GB1433576A
GB1433576A GB3447674A GB3447674A GB1433576A GB 1433576 A GB1433576 A GB 1433576A GB 3447674 A GB3447674 A GB 3447674A GB 3447674 A GB3447674 A GB 3447674A GB 1433576 A GB1433576 A GB 1433576A
Authority
GB
United Kingdom
Prior art keywords
filter
coder
time slot
calibration
highway
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.)
Expired
Application number
GB3447674A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Publication of GB1433576A publication Critical patent/GB1433576A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/14—Monitoring arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/025—Filter arrangements
    • 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
    • H04M3/302—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop using modulation techniques for copper pairs
    • H04M3/303—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop using modulation techniques for copper pairs and using PCM multiplexers, e.g. pair gain systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Dc Digital Transmission (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

1433576 Testing TDM highways; testing coders and decoders INTERNATIONAL BUSINESS MACHINES CORP 6 Aug 1974 [27 Sept 1973] 34476/74 Headings H4L H4K and H3H In a TDM system including a highway 1 extending via a multiplexer/demultiplexer to coders/decoders CN, DN, there is provided on the highway a time division multiplexed filter MDF associated with a memory MEM for storing the filter coefficients applicable to each time slot. The system further includes a calibration arrangement for determining the filter coefficients in dependence on the parameters of the coders and decoders and comprising a source of test signals UT situated at a control location, a precision calibration decoder and coder CP, DP and a calibration wire. To calibrate the filter for a coder allocated to a particular time slot, a calibration switch S1-SN, associated with the particular coder, is switched to position 2 and a digital test signal is sent from the test pulse source, via highway 1, the demultiplexer, and precision decoder DP, to the calibration wire. The test signal in analogue form then passes through a 2-4 wire hybrid LC1-LCN to the corresponding coder, where it is reconverted to digital form and is transmitted back to the central location over highway 1 and through the digital filter in the time slot allocated to the coder. At the central location the correct coefficients for the filter during the particular time slot are then determined from a comparison of the two signals. The reverse process is used for calibrating the filter for a time slot allocated to a decoder DN. The system may be a telephone system using PCM transmission and SPC, the test equipment being situated at an exchange.
GB3447674A 1973-09-27 1974-08-06 Time-division multiplex system Expired GB1433576A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7335247A FR2247858B1 (en) 1973-09-27 1973-09-27

Publications (1)

Publication Number Publication Date
GB1433576A true GB1433576A (en) 1976-04-28

Family

ID=9125834

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3447674A Expired GB1433576A (en) 1973-09-27 1974-08-06 Time-division multiplex system

Country Status (4)

Country Link
JP (1) JPS541122B2 (en)
DE (1) DE2440480A1 (en)
FR (1) FR2247858B1 (en)
GB (1) GB1433576A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2180430A (en) * 1985-09-05 1987-03-25 Motorola Inc A subscriber line card arrangement
GB2266205A (en) * 1992-04-17 1993-10-20 Crystal Semiconductor Corp Calibrating a multi-bit delta-sigma modulator
EP0566778A2 (en) * 1991-11-06 1993-10-27 Sony Corporation Optical disk player with digital servo-control circuit

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5915232B2 (en) * 1977-02-15 1984-04-07 沖電気工業株式会社 Telephone exchange system test method
GB1596943A (en) * 1978-02-14 1981-09-03 Itt Ind Ltd Level control of digital signals
GB2215943A (en) * 1988-03-19 1989-09-27 Stc Plc Multiplexer

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2180430A (en) * 1985-09-05 1987-03-25 Motorola Inc A subscriber line card arrangement
GB2180430B (en) * 1985-09-05 1989-08-23 Motorola Inc Subscriber line card arrangement
EP0566778A2 (en) * 1991-11-06 1993-10-27 Sony Corporation Optical disk player with digital servo-control circuit
EP0566778A3 (en) * 1991-11-06 1993-12-01 Sony Corp Optical disk player with digital servo-control circuit
EP0739002A1 (en) * 1991-11-06 1996-10-23 Sony Corporation Optical disk player with digital servo-control circuit
US5623465A (en) * 1991-11-06 1997-04-22 Sony Corporation Optical disk player with a digital servo-control circuit incorporating a time sharing multifunctional digital filter
US5682307A (en) * 1991-11-06 1997-10-28 Sony Corporation Circuits and methods for controlling a tracking actuator of an optical disk player
GB2266205A (en) * 1992-04-17 1993-10-20 Crystal Semiconductor Corp Calibrating a multi-bit delta-sigma modulator
GB2266205B (en) * 1992-04-17 1996-02-14 Crystal Semiconductor Corp Method and apparatus for calibrating a multi-bit delta-sigma modulator

Also Published As

Publication number Publication date
JPS5061909A (en) 1975-05-27
FR2247858B1 (en) 1976-06-18
FR2247858A1 (en) 1975-05-09
JPS541122B2 (en) 1979-01-20
DE2440480A1 (en) 1975-04-10

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee