System switching circuit based on phase matching

Details System switching circuit based on phase matching System switching circuit based on phase matching

1997-06-27

1999-05-11

Chan, Jason

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

H04L25/36;25/40

Patent

active

059036206

ABSTRACT:
In a system in which a host apparatus having a double system (ACT and SBY systems) and a slave apparatus having a double system are provided, signals from the two systems of the host apparatus merge into each other and a signal from the ACT system of the host apparatus is selected by the slave apparatus, a system switching circuit is provided in which when the systems of the host apparatus are switched from one to the other and the slave apparatus performs data switching, the system switching is effected without causing a jump of data. In the slave apparatus, a phase difference between frame pulses indicative of heads of data pieces from the ACT system and SBY system of the host apparatus is counted by a clock having a frequency which n times (four times or more) the frequency of a clock of the host apparatus, and the phase of data of the SBY system is matched to the phase of data of the ACT system to permit switching free from data jumping.

REFERENCES:
patent: 5673004 (1997-09-01), Park
patent: 5682112 (1997-10-01), Fukushima

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