Optical transmission system wherein protection terminal equipment converts alarm indication signal before relaying same to working terminal equipment
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 14, 2000
Issued Date -
N/A
app pub date -
Jun 7, 1995
filing date -
Feb 18, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical transmission system containing a protection system and a plurality of working systems. When a trouble occurs in the protection system to which one of the working system is switched, a line alarm indication signal (LINE AIS), which can be detected in a reception portion of a piece of terminal equipment, and can activate a switch control circuit, is transmitted to a piece of terminal equipment on the reception side. In response to the receipt of the line alarm indication signal (LINE AIS), the piece of terminal equipment on the reception side transmits a far end receive failure signal (FERF) through an protection system optical transmission line (PTCT2) to a piece of protection system terminal equipment on the transmission side, and transmits a path alarm indication signal (PATH AIS) which does not activate the switch control circuit, through an optical transmission line in the same terminal station to the pieces of working system terminal equipment in the same terminal station on the reception side.
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