Optical transmission system wherein protection terminal equipmen

Details Optical transmission system wherein protection terminal equipmen Optical transmission system wherein protection terminal equipmen

1995-06-07

2000-11-14

Mehta, Bhavesh

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

H04J 1400

Patent

active

061477834

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.

REFERENCES:
patent: 4211920 (1980-07-01), Wakabayashi
patent: 4278850 (1981-07-01), Sato et al.
patent: 4393493 (1983-07-01), Edwards
patent: 4451916 (1984-05-01), Casper et al.
patent: 4837760 (1989-06-01), Reid et al.
patent: 5069521 (1991-12-01), Hardwick
patent: 5091796 (1992-02-01), Nishimura et al.
patent: 5327275 (1994-07-01), Yamane et al.

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