Protection switching system for carrier transmission line
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United States of America Patent
Stats
-
Jul 14, 1987
Grant Date -
N/A
app pub date -
Nov 9, 1984
filing date -
Nov 11, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A line protection switching system of improved reliability decreases the time for protection line switching. In order to increase reliability, service signals are sent in parallel via a plurality of transmission lines, using a service bit area of PCM bit frames. The system switches a failed transmission line to a stand by line, at a local station where trouble is detected without waiting for the switching of an opposite station. At the same time, a switching command is sent to the opposite station. If the switching of the opposite station fails, the local station commands a retry of the switching operation. If it again fails, the local station returns the transmission line to the initial state. In addition, a low priority signal is transmitted through the stand by line, so that the total system operates more economically.
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