JPS5570153A - Communication control unit - Google Patents

Communication control unit

Info

Publication number
JPS5570153A
JPS5570153A JP14396278A JP14396278A JPS5570153A JP S5570153 A JPS5570153 A JP S5570153A JP 14396278 A JP14396278 A JP 14396278A JP 14396278 A JP14396278 A JP 14396278A JP S5570153 A JPS5570153 A JP S5570153A
Authority
JP
Japan
Prior art keywords
circuit
control unit
test
controllability
communication control
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
JP14396278A
Other languages
Japanese (ja)
Other versions
JPS5721893B2 (en
Inventor
Takao Kato
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 JP14396278A priority Critical patent/JPS5570153A/en
Publication of JPS5570153A publication Critical patent/JPS5570153A/en
Publication of JPS5721893B2 publication Critical patent/JPS5721893B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/24—Testing correct operation
    • H04L1/242—Testing correct operation by comparing a transmitted test signal with a locally generated replica
    • H04L1/243—Testing correct operation by comparing a transmitted test signal with a locally generated replica at the transmitter, using a loop-back

Abstract

PURPOSE:To enable the folding test in the state under which the circuit cable connector is attached by providing previously the test terminal to the circuit connection mechanism of the communication control unit independently from the circuit interface terminal, thus enhancing the controllability for the control unit. CONSTITUTION:The control unit consists of 1st circuit connection part 12 comprising transmission part 1, AND circuit 2, circuit interface 3, circuit cable connector 4, test terminal 5, folded cable 6, folded signal line 7, selection circuit 8, reception part 9, input signal lines 10 and 11, and signal line 14 each. Furthermore, 2nd circuit connection part 13 featuring the exactly same structure as part 12 is provided. And a connection is given via connector 15 between a pair of test terminals 5 installed at parts 12 and 13. In such way, the data transmission becomes possible between parts 12 and 13, thus enhancing the controllability and with no misoperation caused at all.
JP14396278A 1978-11-21 1978-11-21 Communication control unit Granted JPS5570153A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14396278A JPS5570153A (en) 1978-11-21 1978-11-21 Communication control unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14396278A JPS5570153A (en) 1978-11-21 1978-11-21 Communication control unit

Publications (2)

Publication Number Publication Date
JPS5570153A true JPS5570153A (en) 1980-05-27
JPS5721893B2 JPS5721893B2 (en) 1982-05-10

Family

ID=15351093

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14396278A Granted JPS5570153A (en) 1978-11-21 1978-11-21 Communication control unit

Country Status (1)

Country Link
JP (1) JPS5570153A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6145655A (en) * 1984-08-10 1986-03-05 Nec Corp Communication control equipment

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0386293U (en) * 1989-12-21 1991-08-30

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6145655A (en) * 1984-08-10 1986-03-05 Nec Corp Communication control equipment

Also Published As

Publication number Publication date
JPS5721893B2 (en) 1982-05-10

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