| 摘要 |
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 No. 7 Common Channel Signaling (CCS) system recommended by CCITT. When a serious fault, such as system-down, occurs in an LO (first LO) in the group, a serious alarm signal is sent from the first LO to the CMOC through the local line, another LO (second LO) in the group and the DTL connecting between 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 switching network in the first LO or through the DTL toward the second LO, the second LO and the local line.
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