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Echo (computing)
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<p>In <a href="/facts/Telecommunications/vxoj1cxR">telecommunications</a>, echo is the local display of data, either <i>initially</i> as it is locally sourced and sent, or <i>finally</i> as a copy of it is received back from a remote destination. Local echo is where the <i>local</i> sending equipment displays the outgoing sent data. Remote echo is where the display is a return copy of data as received <i>remote</i>ly. Both are used together in a computed form of <a href="/facts/Error_detection/o2rH8e3n">error detection</a> to ensure that data received at the remote destination of a telecommunication are the same as data sent from the local source (a/k/a echoplex, echo check, or loop check). When (two) <a href="/facts/Modem/9H0Xwtq0">modems</a> communicate in echoplex mode the remote modem echoes whatever it receives from the local modem. </p>