Multiplex communications – Wide area network – Packet switching
Patent
1988-02-12
1989-09-26
Griffin, Robert L.
Multiplex communications
Wide area network
Packet switching
370 17, 371 7, 371 201, H04J 116
Patent
active
048706388
ABSTRACT:
A remote maintenance system for a digital communication network, comprises local offices (LOs), at least two of which are grouped and connected to each other by a local line in the group, and a centralized maintenance and operation center (CMOC) located at a tandem office and connected to each LO by an ordinary digital transmission line (DTL) using the No. 7 Common Channel Signaling (CCS) system recommended by the CCITT. When a serious fault, such as system-down, occurs in a first LO in the group, a serious alarm signal is sent from the first LO to the CMOC through the local line, a second LO in the group and the DTL connecting the second LO and the CMOC, so that maintenance data for repairing the serious fault are provided at the CMOC and sent, under the No. 7 CCS system, to the first LO through the DTL toward the first LO. The maintenance data is sent without using a local switching network in the first LO, and can be sent through the DTL toward the second LO, the second LO and the local line to the first LO.
REFERENCES:
patent: 4273955 (1981-06-01), Armstrong
patent: 4575839 (1986-03-01), Ogawa et al.
Kawano Hisao
Yamamoto Kunio
Fujitsu Limited
Griffin Robert L.
Scutch III Frank M.
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