Self-healing ring switch and method of controlling the same

Details Self-healing ring switch and method of controlling the same Self-healing ring switch and method of controlling the same

1994-12-15

1997-02-04

Hsu, Alpus H.

Multiplex communications

Fault recovery

Bypass an inoperative switch or inoperative element of a...

370223, 370372, H04J 308, H04J 314

Patent

active

056006314

ABSTRACT:
In order that the various ring-switching modes of 2-Fiber BLSR, 4-Fiber BLSR and UPSR may be switched merely by changing a software, space division switches are disposed across an add drop switch, and one output drop switch and one output of the second space division switch are connected with the input stage of a selector which can be selected at the unit of a time slot. As a result, the various ring-switching modes can be switched merely by changing the software while suppressing the scale of the switch. Moreover, the change from the ring switch to the linear switch and vice versa can be effected.

REFERENCES:
patent: 4470139 (1984-09-01), Munter
patent: 4797589 (1989-01-01), Collins
patent: 4964095 (1990-10-01), Tyrrell et al.
patent: 5018135 (1991-05-01), Ashi et al.
patent: 5179548 (1993-01-01), Sandesara
patent: 5216666 (1993-06-01), Stalick
patent: 5311501 (1994-05-01), Takatsu
patent: 5412652 (1995-05-01), Lu
Bellcore, Bell Communications Research, Technical Advisory TA-NWT-001230, Issue 2, Apr. 1992: Sonet Bidirectional Line Switched Ring Equipment Generic Criteria.
Bellcore, Bell Communications Research, Technical Reference TR-TSY-000496 issue 2, Sep. 1989, Supplement 1, Sep. 1991: Sonet Add-Drop Multiplex Equipment (Sonet Adm) Generic Criteria.
American National Standards Institute, Inc., American National Standard for Telecommunications, draft standard 9/15/92: Synchronous Optical Network (Sonet ): Automatic Protection Switching.

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