Synchronous clock supply system and synchronous clock supply...

Details Synchronous clock supply system and synchronous clock supply... Synchronous clock supply system and synchronous clock supply...

2004-01-05

2010-02-09

Shah, Chirag G (Department: 2477)

Multiplex communications

Fault recovery

Bypass an inoperative station

C370S503000, C714S100000, C714S744000

Reexamination Certificate

active

07660237

ABSTRACT:
A switching unit (1011) receives video data (103) sent from a device (102), and sends an ATM cell synchronized with the clock to switching units (1012-1014) by a signal (including optical data) containing a frequency component serving as a synchronous clock supply source. If a fault occurs midway along a line, the switching unit (1012) which detects the fault sends an AIS cell to an OAM connection (109). The termination switching unit (1014) switches a port f for receiving a synchronous clock to a port g, and sends back an RDI cell. The switching units (1013, 1012) which have received the RDI cell switch the synchronous clock to ports e and c and receive it, thus obtaining an identical clock.

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