Apparatus for detecting clock failure for use in a synchronous t

Details Apparatus for detecting clock failure for use in a synchronous t Apparatus for detecting clock failure for use in a synchronous t

1997-09-10

1999-08-31

Pham, Chi H.

Pulse or digital communications

Synchronizers

Synchronization failure prevention

375354, 371 277, 327 41, H04L 700

Patent

active

059463627

ABSTRACT:
An apparatus for use in a synchronous transmission system, for detecting a failure of a clock signal, which comprises: a reference clock generator for generating a reference clock signal (RCS) in response to a reset signal issued by a system controller in the STS; and means for receiving a clock signal, the RCS issued by the reference clock signal generating means and the reset signal and for producing a failure signal for the received clock signal, wherein the failure represents a state of a clock in which the clock does not have a pulse for a predetermined time interval, the time interval being measured by using the RCS.

REFERENCES:
patent: 5005193 (1991-04-01), Simpson
patent: 5347523 (1994-09-01), Khatri
patent: 5404363 (1995-04-01), Krause et al.
patent: 5642069 (1997-06-01), Waite
patent: 5790609 (1998-08-01), Swoboda
patent: 5818849 (1998-10-01), Komatsu

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