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Variable data rate channel for digital network

  • US 4,805,167 A
  • Filed: 07/29/1987
  • Issued: 02/14/1989
  • Est. Priority Date: 07/29/1986
  • Status: Expired due to Term
First Claim
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1. A method of transmitting high bit-rate signals having a variable bit-rate including the steps ofdividing a digital input signal having a bit-rate higher than a predetermined bit-rate into a sequence of subordinate digital signals having data rates equal to or less than the said predetermined bit-rate,transmitting the subordinate digital signals using a group of transmission channels with each subordinate signal transmitted by a respective channel, the channels in the group each being capable of handling the said predetermined bit-rate,receiving the transmitted signals,assembling the received subordinate signals to provide an output signal in which the sequence of data bits is the same as that of the input signal,changing the number of the said transmission channels making up the said group while continuing to transmit subordinate signals along those channels of the said group which are not changed,wherein a plurality of input signals are transmitted simultaneously, each input signal being transmitted by way of a respective group of the said transmission channels, each of which is duplex, and the method further includinginserting marker signals from time to time in each subordinate signal in each said channel and in any other channels which are required to be added to one of the groups,the marker signals including first, second and third flag signals depending respectively on whether the channel is transmitting a subordinate signal, whether marker signals have been received in the corresponding channel, and whether a subordinate signal is no longer to be sent by this channel.

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