Local loop is a telecommunications term for the "last mile[?]" connection from the trunk to the subscriber.
A modem can be configured to loop incoming signals from either the remote modem or the local terminal. This can be used for error diagnostics, comparing the data sent to the data received.
... individual symbols was included on Morse's patent. It is this kind of code that was used for the first telegraph message.
The code is transmitted either as an ...
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