JPS55141889A - Digital telephone exchange system - Google Patents

Digital telephone exchange system

Info

Publication number
JPS55141889A
JPS55141889A JP4993479A JP4993479A JPS55141889A JP S55141889 A JPS55141889 A JP S55141889A JP 4993479 A JP4993479 A JP 4993479A JP 4993479 A JP4993479 A JP 4993479A JP S55141889 A JPS55141889 A JP S55141889A
Authority
JP
Japan
Prior art keywords
pcm
low
digital
channel
channel system
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
JP4993479A
Other languages
Japanese (ja)
Inventor
Yoshinori Yoshida
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP4993479A priority Critical patent/JPS55141889A/en
Publication of JPS55141889A publication Critical patent/JPS55141889A/en
Pending legal-status Critical Current

Links

Classifications

    • 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)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)

Abstract

PURPOSE:To enable the mixed allocation of PCM 24 channel system and PCM 32 channel system, by absorbing the difference of the companding law between mu-low and A-low with the digital-digital conversion circuit. CONSTITUTION:The PCM lines (four) of 24 channel system are received at the digital line termination unit DTI (mu), where the processing such as bipolar/unipolar signal conversion is made and multiplex is made at the multiplex circuit MUX. Further, the digital conversion circuit mu-A performs conversion of the PCM code pattern based on A-low from mu-low and it is fed to the time sharing communication path TDSW. The PCM lines (four) of 30/32 channel time slot are terminated at the digital line terminator DT1 (A), multiplexed at MUX and fed to TDSW. Thus, the PCM signal of 24, 32 channel can be allocated with mixture.
JP4993479A 1979-04-23 1979-04-23 Digital telephone exchange system Pending JPS55141889A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4993479A JPS55141889A (en) 1979-04-23 1979-04-23 Digital telephone exchange system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4993479A JPS55141889A (en) 1979-04-23 1979-04-23 Digital telephone exchange system

Publications (1)

Publication Number Publication Date
JPS55141889A true JPS55141889A (en) 1980-11-06

Family

ID=12844840

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4993479A Pending JPS55141889A (en) 1979-04-23 1979-04-23 Digital telephone exchange system

Country Status (1)

Country Link
JP (1) JPS55141889A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58221591A (en) * 1982-06-18 1983-12-23 Japan Radio Co Ltd Constitution of digital exchange network

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58221591A (en) * 1982-06-18 1983-12-23 Japan Radio Co Ltd Constitution of digital exchange network

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