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Reference.org
Commutation (telemetry)
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<p>In <a href="/facts/Telemetry/Mz9czXTl">telemetry</a>, commutation is a process whereby multiple data streams ("measurands"), possibly with differing data rates, are combined into a single <a href="/facts/Frame_(networking)/ltGCbJIq">frame-based</a> stream for <a href="/facts/Transmission_(telecommunications)/33zk8a0A">transmission</a>, before being separated again (decommutated) upon reception; it is a form of <a href="/facts/Time-division_multiplexing/tv7bMh1v">time-division multiplexing</a>. <a href="/facts/Frame_synchronization/uCRQnA4J">Frame synchronization</a> must be achieved before a data stream can be decommutated. </p>