Channel allocation on a time division multiplex bus

Details Channel allocation on a time division multiplex bus Channel allocation on a time division multiplex bus

H - Electricity

04

J

363/19

H04J 3/02 (2006.01)

Patent

CA 1253640

CHANNEL ALLOCATION ON A TIME DIVISION MULTIPLEX BUS Abstract of the Disclosure A novel method and apparatus for quickly allocating channels on a TDM (time division multiplex) bus to devices requesting access to those channels. In one embodiment, each channel of the TDM bus consists of nine bits and each device has a unique eight bit identification code plus one status bit (referred to collectively as a unique nine bit device code). If a channel is not occupied, each device wishing to gain access to the channel applies its own unique nine bit device code to the bus in the channel time period, sequentially, in order of significance. While doing this, each device monitors the bus to determine what code signal is on it; as soon as it detects a code bit differing from its own, it declares a conflict and stops sending its code, only to wait for the occurrence of the next channel when it retries. The device that is successful in applying all the bits of its code to the bus without conflict declares itself to be the winner, and on the next appearance of that channel (i.e. in the next frame) it transmits as the first bit in the channel a status bit set to alert other contenders for the channel that it is taken. - i -

512940

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