Method and apparatus for the synchronization of a clock means of

Details Method and apparatus for the synchronization of a clock means of Method and apparatus for the synchronization of a clock means of

1992-08-28

1994-12-13

Chin, Stephen

Pulse or digital communications

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375118, 371 54, 371 471, 327141, 327144, 327291, H04L 700, G06F 1520

Patent

active

053735374

ABSTRACT:
Method and apparatus for synchronizing a clock of a telecommunication switching system. The clock of the telecommunication switching system is supplied, at least at times, with reference clock signals from a plurality of external reference clock sources. Every external reference clock source has a predetermined priority allocated to it. The supplied reference clock signals are checked for clock errors to which individual errors are allocated. For synchronization, the clock accepts an external reference clock signal dependent on the priorities allocated to the reference clock sources and dependent on the clock-error-associated error values. In an initialization, initial error values are allocated to the reference clock sources. In a re-initialization of the system, the synchronization procedure is continued from the current error values that are present at the time of the system outage.

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R. Schauer, "External Clock Synchronization Plans for the 6TD 3 EAX Digital Toll/Tandem", Jul. 1979, IEEE Transactions on Communications, vol. 27.
"Lehrbuch Der Fernmeldetechnik" by Bergmann, vol. 1, 5th edition, Berlin (1986), p. 485.
"Master-slave synchronization techniques" by Katsuya Okimi et al, IEEE Communications Magazine, vol. 19, No. 3, May 1981, pp. 12-21.

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