demultiplex unit

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Pair gain — In telephony, pair gain is a method of transmitting multiple POTS signals over the twisted pairs traditionally used for a single traditional subscriber line in telephone systems. Pair gain has the effect of creating additional subscriber lines.… … Wikipedia
Network interface device — In telecommunications, a Network Interface Device (NID) is a device that serves as the demarcation point between the carrier s local loop and the customer s premises wiring. Generically, an NID may also be called a Network Interface Unit (NIU),… … Wikipedia

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