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Error Recovery Technique for Channelized Modems Using Stochastic Multiplexing

IP.com Disclosure Number: IPCOM000045102D
Original Publication Date: 1983-Jan-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Callens, P: AUTHOR

Abstract

This is technique for improving time division multiplexing wherein the channel selection is provided on a stochastic basis. Stochastic multiplexing allocates the channels to the connected users dynamically, based on the data stream itself. Therefore, any transmission noise would develop erroneous channelization at the receiver side.

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Error Recovery Technique for Channelized Modems Using Stochastic Multiplexing

This is technique for improving time division multiplexing wherein the channel selection is provided on a stochastic basis. Stochastic multiplexing allocates the channels to the connected users dynamically, based on the data stream itself. Therefore, any transmission noise would develop erroneous channelization at the receiver side.

Any false channelization would be avoided by providing the system with an error recovery function. For that purpose, a framing sequence of bits (FSB) would be inserted into the transmitted flow of bits, which FSB would include: - C-C, i.e, two cyclic checking characters derived from the data, - F, i.e., a flag which would be the hexadecimal character 7E when transmitting in SDLC, - A and C, i.e., two bytes which will enable the exchange of control and status information between interconnected

stations. The meaning of these two bytes may be chosen among

the various conventions used in SDLC-HDLC.

Any moment may be chosen for inserting the FSB sequence. However, to be as compatible with current data link control (SDLC or HDLC), these moments should be chosen such that the total number of data bits previously transmitted is a multiple of eight (not including the stuffing bits).

The transmitting station regularly waits for an acknowledging sequence sent back by the receiving station. This ackowledgment includes information regarding the reference number of the se...