JPS6451744A - Test loopback control circuit for data line terminator - Google Patents

Test loopback control circuit for data line terminator

Info

Publication number
JPS6451744A
JPS6451744A JP62209087A JP20908787A JPS6451744A JP S6451744 A JPS6451744 A JP S6451744A JP 62209087 A JP62209087 A JP 62209087A JP 20908787 A JP20908787 A JP 20908787A JP S6451744 A JPS6451744 A JP S6451744A
Authority
JP
Japan
Prior art keywords
signal
data line
line terminator
data
test
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.)
Granted
Application number
JP62209087A
Other languages
Japanese (ja)
Other versions
JPH0687570B2 (en
Inventor
Akihito Yonehara
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
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 filed Critical NEC Corp
Priority to JP62209087A priority Critical patent/JPH0687570B2/en
Publication of JPS6451744A publication Critical patent/JPS6451744A/en
Publication of JPH0687570B2 publication Critical patent/JPH0687570B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Detection And Prevention Of Errors In Transmission (AREA)
  • Maintenance And Management Of Digital Transmission (AREA)

Abstract

PURPOSE:To conduct the test of a data line terminator without intermitting the communication between data terminal equipments by decreasing the signal speed of transmission/reception of a data terminal station equipment during test setting. CONSTITUTION:The test state is recognized by an external input signal SW in a data line terminator 100 at the test setting side to control selectors 2, 8, 9, 10 and a multiplexer 7. The selector 2 sends a timing signal TIM having a speed of N(M-1)/Mbit/S from a timing signal generator 1 to a data terminal equipment 200. The multiplexer 7 multiplexes a loopback signal of N/Mbit/S from a loopback signal generator selected by the selector 8 and a transmission data SD of the N(M-1)bit/S from the data terminal equipment 200 are multiplexed to generate the multiplex signal of Nbit/S. The selector 10 selects the multiplex signal and sends the result as a transmission signal T to the data line 300. The similar operation is applied even in the data line terminator to be tested side.
JP62209087A 1987-08-21 1987-08-21 Test loopback control circuit for data line terminator Expired - Lifetime JPH0687570B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62209087A JPH0687570B2 (en) 1987-08-21 1987-08-21 Test loopback control circuit for data line terminator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62209087A JPH0687570B2 (en) 1987-08-21 1987-08-21 Test loopback control circuit for data line terminator

Publications (2)

Publication Number Publication Date
JPS6451744A true JPS6451744A (en) 1989-02-28
JPH0687570B2 JPH0687570B2 (en) 1994-11-02

Family

ID=16567059

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62209087A Expired - Lifetime JPH0687570B2 (en) 1987-08-21 1987-08-21 Test loopback control circuit for data line terminator

Country Status (1)

Country Link
JP (1) JPH0687570B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04116450U (en) * 1991-03-29 1992-10-19 宏 吉原 Car phone receiver

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04116450U (en) * 1991-03-29 1992-10-19 宏 吉原 Car phone receiver

Also Published As

Publication number Publication date
JPH0687570B2 (en) 1994-11-02

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