JPS56141641A - Channel equipment of pulse code modulation terminal - Google Patents

Channel equipment of pulse code modulation terminal

Info

Publication number
JPS56141641A
JPS56141641A JP4426080A JP4426080A JPS56141641A JP S56141641 A JPS56141641 A JP S56141641A JP 4426080 A JP4426080 A JP 4426080A JP 4426080 A JP4426080 A JP 4426080A JP S56141641 A JPS56141641 A JP S56141641A
Authority
JP
Japan
Prior art keywords
filter
channel
switch
receiving side
transmission side
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.)
Pending
Application number
JP4426080A
Other languages
Japanese (ja)
Inventor
Toshinori Tsuboi
Seiichiro Kozuka
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone 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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP4426080A priority Critical patent/JPS56141641A/en
Publication of JPS56141641A publication Critical patent/JPS56141641A/en
Pending 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

PURPOSE:To automatically test the channel parts such as an encoder, a decoder, a filter, etc., by providing a folding circuit of an analog signal between the output point of a receiving side filter and the input point of a transmission side filter, in a PCM terminal station equipment. CONSTITUTION:In the channel equipment of 1 channel portion of the PCM terminal station equipment, at the time of a call, the switches 3, 10 which are controlled by a control input of the switch control terminal 14 are set so as to connect the transmission side level setting circuit 2 and the transmission side channel filter 4, and the receiving side channel filter 9 and the receiving side level setting circuit, respectively. At the time of a test, the switch 3 connects the attenuator 13 and the transmission side channel filter 4, and the switch 10 connects the receiving side channel filter 9 and the attenuator 13, by which a folding circuit is formed. A testing signal is folded to the output terminal 6 by the time slot corresponding to the channel through the input terminal 7, the filter 9, the switch 10, the attenuator 13 and the switch 10.
JP4426080A 1980-04-04 1980-04-04 Channel equipment of pulse code modulation terminal Pending JPS56141641A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4426080A JPS56141641A (en) 1980-04-04 1980-04-04 Channel equipment of pulse code modulation terminal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4426080A JPS56141641A (en) 1980-04-04 1980-04-04 Channel equipment of pulse code modulation terminal

Publications (1)

Publication Number Publication Date
JPS56141641A true JPS56141641A (en) 1981-11-05

Family

ID=12686538

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4426080A Pending JPS56141641A (en) 1980-04-04 1980-04-04 Channel equipment of pulse code modulation terminal

Country Status (1)

Country Link
JP (1) JPS56141641A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60246139A (en) * 1984-05-22 1985-12-05 Nec Corp Coder and decoder
JPS6339226A (en) * 1986-08-04 1988-02-19 Fujitsu Ltd Loopbacik test system
US5557437A (en) * 1994-09-29 1996-09-17 Fujitsu Limited Optical terminal system having self-monitoring function

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60246139A (en) * 1984-05-22 1985-12-05 Nec Corp Coder and decoder
JPS6339226A (en) * 1986-08-04 1988-02-19 Fujitsu Ltd Loopbacik test system
US5557437A (en) * 1994-09-29 1996-09-17 Fujitsu Limited Optical terminal system having self-monitoring function

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