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Data transmission system and method for transmitting data having real-time and non-real-time characteristics

  • US 5,430,843 A
  • Filed: 07/26/1994
  • Issued: 07/04/1995
  • Est. Priority Date: 02/16/1987
  • Status: Expired due to Fees
First Claim
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1. A system for transmitting data between N linked stations, where N is greater than 2, one of which is designated a master station, within a cycle period defined as a period between successive transmissions of a header signal indicating a start of data transmission by the N linked stations, only one station having a right to transmit data at a given time, the data transmitted by each station including a first portion for which real-time characteristics are required, and a second portion for which real-time characteristics are not required, each Mth station (1<

  • =M<

    =N) comprising;

    transmission means for transmitting a header signal to another station when the station including the transmission means is designated a master station, and for transmitting ones of both the first and second data portions to another station,receiver means for receiving a header signal and first and second data portions transmitted from another station, andcontrol means, coupled to the transmission means and the receiver means, for assigning to the station including the control means the right to transmit data in a cycle period, wherein the cycle period is divided into 2N time slots, and wherein data is transmitted by the control means only in at least one of a first time slot constituting an Mth time slot, and a second time slot constituting an N+Mth time slot within the cycle period and for transmitting the first portion of the data separate from transmission of the second portion of the data, the first portion being transmitted by the transmission means in the first time slot and the second portion being transmitted by the transmission means in the second time slot, wherein the control means is able to transmit data only in the first and second time slots.

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