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.
... with the proper backstop. Some of the stronger power "springers" can propel a pellet beyond 1100 fps (approximately the speed of sound) and will produce a noise similar to ...
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