JPS55128949A - Function testing system for communication control unit - Google Patents

Function testing system for communication control unit

Info

Publication number
JPS55128949A
JPS55128949A JP3677679A JP3677679A JPS55128949A JP S55128949 A JPS55128949 A JP S55128949A JP 3677679 A JP3677679 A JP 3677679A JP 3677679 A JP3677679 A JP 3677679A JP S55128949 A JPS55128949 A JP S55128949A
Authority
JP
Japan
Prior art keywords
control unit
communication control
clock
sent
memory
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
JP3677679A
Other languages
Japanese (ja)
Inventor
Yoshihiro Kitano
Yoichi Suzuki
Teruyoshi Mita
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP3677679A priority Critical patent/JPS55128949A/en
Publication of JPS55128949A publication Critical patent/JPS55128949A/en
Pending 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)

Abstract

PURPOSE:To secure the function test with the single unit of the communication control unit by installing within the communication control unit the clock oscillator of the same frequency as the clock of the monitor device plus the delay memory featuring the equal time to the loop transmission delay time each. CONSTITUTION:When the single unit test mode is designated through the control panel, the clock sent from clock oscillation circuit 8 in the communication control unit is supplied to each part in place of the clock which is sent from the monitor device to repeater 2 via transmission line 1. And the data from control part 4 is sent to transmission part 5 via frame buffer memory 7. The data of the serial bits sent from part 5 is supplied to reception part 3 and then returned to part 4 again. As the delay time of memory 7 is equal to the loop delay time on the transmission line, the artifitial loop is formed within the communication control unit. Thus the data read out of memory 7 can be seen as if it were just on the transmission line. As a result, each block within the communication control unit features nearly the same operation as that of the normal operation, thus enabling the test with the single unit.
JP3677679A 1979-03-28 1979-03-28 Function testing system for communication control unit Pending JPS55128949A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3677679A JPS55128949A (en) 1979-03-28 1979-03-28 Function testing system for communication control unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3677679A JPS55128949A (en) 1979-03-28 1979-03-28 Function testing system for communication control unit

Publications (1)

Publication Number Publication Date
JPS55128949A true JPS55128949A (en) 1980-10-06

Family

ID=12479165

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3677679A Pending JPS55128949A (en) 1979-03-28 1979-03-28 Function testing system for communication control unit

Country Status (1)

Country Link
JP (1) JPS55128949A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61187444A (en) * 1985-02-15 1986-08-21 Hitachi Ltd Method for diagnosing station

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50134507A (en) * 1974-04-13 1975-10-24

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50134507A (en) * 1974-04-13 1975-10-24

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61187444A (en) * 1985-02-15 1986-08-21 Hitachi Ltd Method for diagnosing station

Similar Documents

Publication Publication Date Title
EP0126163A4 (en) Controller with status display unit.
JPS6477339A (en) Collision detecting type lan terminal interface module
DE69330816D1 (en) DATA COMMUNICATION TERMINAL WITH CONTINUOUS MESSAGES OF VARIABLE LENGTH
JPS55128949A (en) Function testing system for communication control unit
EP0639812A3 (en) Synchronizing asynchronous circuits for testing operations.
JPS561642A (en) Transmission error generating device
JPS57173246A (en) Data transmission system
JPS5797247A (en) Stuff control system
JPS643745A (en) Emulation system
JPS5499506A (en) Repeating monitor system
JPS55102952A (en) Mutual synchronization system
JPS5781746A (en) Control system of data transmission in loop transmission system
JPS5567834A (en) Trace system for communication control unit
TW262579B (en) A device with added dialer test function and control method thereof
JPS57101450A (en) Loop transmission system
JPS5461814A (en) Data transmission system
KR910021067A (en) Transmission Clock Search Circuit of Serial Interface Device
JPS55138944A (en) Transmission line control system
JPS57129048A (en) Loop data transmitting device
JPS57116415A (en) Reference pulse generator
JPS55136746A (en) Communication system of loop transmission system
JPS6477349A (en) Timing switching system for transmission equipment
JPS5612158A (en) Parallel data transmission system
JPS5799893A (en) Time division multiplex transmission controller
GB1267652A (en) Improvements relating to radio communication systems