simplex channel

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simplex channel

[′sim‚pleks ¦chan·əl]
(communications)
A channel which permits transmission in one direction only.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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So the Trilogy solution treats a push to talk on a panel as an individual SIP call with simplex communication. At the called panel the device has to recognise the SIP signalling and auto-answer to hear the message.
Some applications can survive with simplex communication. This would be the case when all the application is intended to do is to collect data from a remote point.
Our simplex communication protocol allows us to achieve any desired level of reliability while using an unreliable simplex link [1].