Method for synchronizing synchronous data communication network and communication device used in the synchronous data communication network

  • US 5,386,418 A
  • Filed: 05/04/1993
  • Issued: 01/31/1995
  • Est. Priority Date: 08/19/1991
  • Status: Expired due to Term
First Claim
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1. A method of switching from one synchronizing signal source to another in a synchronous data communication network including a plurality of stations with at least one child station and at least one parent station connected to each other via lines, and a plurality of synchronizing signal sources provided for said stations, the method comprising, in combination, steps of:

  • (a) setting, in a signal transmitted via said lines and including synchronizing information related to one of said plurality of synchronized signal sources, and flag bit data indicative of whether or not a timing of said one of the plurality of synchronizing signal sources related to said synchronizing information transmitted via said lines can be used as a synchronizing signal source on each station which receives said information transmitted via said lines;

    (b) referring each station, from among said plurality of stations on the basis of said flag bit data, to a table provided in each said station for specifying an order of priority for selection of a synchronizing signal source, upon occurrence of a predetermined event in any of said plurality of synchronizing signal sources, and for selecting a synchronizing signal source; and

    (c) switching each station from the currently selected synchronizing signal source to the synchronizing signal source selected in said step (b).

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