Method and apparatus for graceful preemption on a digital...

Details Method and apparatus for graceful preemption on a digital... Method and apparatus for graceful preemption on a digital...

H - Electricity

04

L

354/234, 340/84

H04L 5/14 (2006.01) H04L 29/06 (2006.01)

Patent

CA 1197590

- 33 - METHOD AND APPARATUS FOR GRACEFUL, PREEMPTION ON A DIGITAL COMMUNICATIONS LINK Abstract A method and apparatus for preemption on a digital communications link used for selective communication by a plurality of user devices. When a first user device is actively communicating over the link, a second user device can preempt the first user device by having a link controller transmit a preempt character. The link controllers at either end of the link each save values of a set of status variables collectively defining the status of the link controller. When the second user device relinquishes link access, the saved values are used to return the link controllers to their status at the time of preemption such that the first user device can resume communication from the point of interruption without requiring data retransmission.

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