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.
... Abbreviation. dB referenced to one milliwatt.
Note 1: dBm is used in communication work as a measure of absolute power values. Zero dBm equals one ...
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