Method and apparatus for multiplex transmission

Details Method and apparatus for multiplex transmission Method and apparatus for multiplex transmission

2008-05-13

2008-05-13

Pham, Chi (Department: 2616)

Multiplex communications

Fault recovery

Bypass an inoperative station

C370S227000, C370S242000, C370S248000, C370S249000

Reexamination Certificate

active

07372807

ABSTRACT:
In a transmission network including multiplex transmission units A, F, G, D and E, when the line breakage has occurred on the OC-12 transmission path of the direction from unit A to unit F, the unit F detects the signal coming in from the OC-12 path indicative of the line breakage. The unit F inserts the APS bytes which comes in from the unit A into the undefined area of the OC-192 transport overhead which is reserved for the through-transport of APS bytes, and transports it to the unit G. On receiving the through-transport APS bytes, the unit G inserts it intact into the defined area for the APS bytes in the OC-12 transport overhead, and sends it to the unit D. In this manner, protection switching between the units A and D is carried out.

REFERENCES:
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patent: 5390164 (1995-02-01), Kremer
patent: 5491686 (1996-02-01), Sato
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patent: 2287596 (1995-09-01), None
Zhi-Wei Lin: Support of optional selective protection lock-out for non-preemptible unprotected traffic(NUT) dated Jul. 16, 1996.
European Search Report dated Jul. 2, 2002.

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