JPS56141641A - Channel equipment of pulse code modulation terminal - Google Patents
Channel equipment of pulse code modulation terminalInfo
- 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
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.
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)
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 |
-
1980
- 1980-04-04 JP JP4426080A patent/JPS56141641A/en active Pending
Cited By (3)
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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