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- 1. In telephony, all cables, conduits, ducts, poles, towers, repeaters, repeater huts, and other equipment located between a demarcation point in a switching facility and a demarcation point in another switching facility or customer premises. Note: The demarcation point may be at a distribution frame, cable head, or microwave transmitter. 2. In DOD communications, the portion of intrabase communications equipment between the main distribution frame (MDF) and a user end instrument or the terminal connection for a user instrument.
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- bridged tap, cable assembly, channel, combined distribution frame (CDF), electronic equipment enclosure (EEE), intermediate distribution frame (IDF), main distribution frame (MDF), telecommunications link