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TDM data communications network wherein each data frame is divided into respective lower rate sub-frames for respective sets of substations, and main station and substation for use therein

  • US 5,509,003 A
  • Filed: 07/11/1994
  • Issued: 04/16/1996
  • Est. Priority Date: 07/09/1993
  • Status: Expired due to Fees
First Claim
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1. A telecommunications network comprising a main station which is coupled by a transmission channel to a plurality of substations, the main station receiving a plurality of data messages addressed to respective substations and combining the data messages for transmission over the transmission channel;

  • characterized in that;

    the main station comprisesinterface means for combining the data messages by time division sampling to form a series of time division multiplex input data frames, each input data frame having time slots assigned to respective ones of said substations, the time slots having a predetermined bit rate;

    frame splitting means coupled to said interface means for splitting each input data frame into a plurality n of sub-frames;

    where n≧

    2;

    each sub-frame having 1/n-th the number of time slots in an input data frame, so that each sub-frame has a bit rate which is 1/n-th said predetermined bit rate, any given sub-frame of each frame including the time slots assigned to a given set of said substations;

    sub-frame assembling means coupled to said frame splitting means for combining the n sub-frames by bit interleaving, thereby forming a series of bit interleaved downstream data frames, and including in each downstream data frame characterizing information identifying the substations assigned to each of the sub-frames in said downstream data frame; and

    means for transmitting said series of downstream data frames over said transmission channel for reception therefrom by each of said substations; and

    each substation comprises means for adjusting the substation to receive data from each downstream data frame only during a sub-frame thereof to which said substation is assigned, as signified by the substation characterizing information included in the downstream data frame;

    whereby each substation receives data from a downstream data frame at the bit rate of a sub-frame therein to which said substation is assigned, which bit rate is 1/n-th of said predetermined bit rate.

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