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.
List of TLAs
Table of all possible TLAs from AAA to DZZ
Table of all possible TLAs from EAA to HZZ
Table of all possible TLAs from IAA to ...
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