Communications: electrical – Continuously variable indicating – With meter reading
Patent
1982-12-28
1985-09-17
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
370 43, 370 61, H04Q 900, H04J 600
Patent
active
045423806
ABSTRACT:
A method and apparatus for graceful preemption on a digital communications link used for selective communication from a plurality of user devices. Link controllers are used to implement the enforcement of a protocol on the link. When a first user device is actively communicating over the link, a second user device can gracefully 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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Beckner Mark W.
Starr Thomas J. J.
AT&T Bell Laboratories
Samples Kenneth H.
Watland Ross T.
Yusko Donald J.
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