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Patent Searching and Data


Title:
LINE QUALITY MONITORING SYSTEM
Document Type and Number:
Japanese Patent JPH0537486
Kind Code:
A
Abstract:

PURPOSE: To transmit the exact line quality information of reception to a counter station and to monitor the line quality of transmission at the own station equipment.

CONSTITUTION: When a receiving DS3 signal S7 is received by a separator circuit 2 and a frame having error is detected, an own station multiplexer 1 transmits a detecting signal pulse to a counter 3 and executes counting-up. This total count value is outputted to a coder 5 by a trigger from a monitor timer clock generating circuit 4, turned to a binary code and outputted to a multiplexer circuit 6, and a transmitting DS3 signal S8 inserted to the C-bit of a transmitting signal frame is transmitted to a counter station multiplexer 11. At the counter station multiplexer 11, quality monitor information made into the binary code is extracted from the C-bit of the transmitting DS3 signal S8 received by the separator circuit 12, and the quality of a transmission line is monitored.


Inventors:
YOSHIYAMA SHUNJI
MAKINO JUN
Application Number:
JP1991000187974
Publication Date:
February 12, 1993
Filing Date:
July 29, 1991
Export Citation:
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Assignee:
NEC CORP
MIYAGI NIPPON DENKI KK
International Classes:
H04J3/07; H04J3/14; H04L29/14; (IPC1-7): H04J3/07; H04J3/14; H04L29/14
Attorney, Agent or Firm:
岩佐 義幸