Control system for a ring type network system

Details Control system for a ring type network system Control system for a ring type network system

1994-02-14

1996-07-02

Chin, Wellington

Multiplex communications

Wide area network

Packet switching

370 8515, H04L 1122

Patent

active

055330061

ABSTRACT:
A node for a ring type synchronous optical network can continue to communicate with another node, when a transmission path is interrupted, located on the opposite side of the interrupted transmission path. A cross connecting unit cross connects the ring type transmission path with an external transmission path. The cross connecting unit generates and sends to another node an alarm indication signal when the ring type optical path is interrupted. A path switching unit switches the connection of an external transmission path to either direction of the ring type transmission path. A controlling unit controls the path switching unit, when an alarm indication signal is received from another node, so that the path switching unit switches the connection to a side opposite to a side from which the alarm indication signal has been received.

REFERENCES:
patent: 4506357 (1985-03-01), Nakayashiki et al.
patent: 4593154 (1986-06-01), Takeda et al.
patent: 5159595 (1992-10-01), Flanagan et al.
patent: 5265096 (1993-11-01), Parruck
patent: 5278824 (1994-01-01), Kremer
patent: 5282200 (1994-01-01), Dempsey et al.
patent: 5307353 (1994-04-01), Yamashita et al.

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