The NIU (network interface unit) or NID (network interface device) at the ISP's demarc serves what purpose?
What will be an ideal response?
ANSWER: The NIU, or NID (network interface device), at the demarc connects the ISP's local loop to the customer's network. A more intelligent version of an NIU is a smart jack, or INID (Intelligent NID), which can provide diagnostic information about the interface. For example, a smart jack might include loopback capabilities. Just like the loopback adapter you use to test a port or cable on your computer, the smart jack can loop the ISP's signal back to the CO (central office) for testing. The ISP is responsible for all wiring leading up to the NIU and for the NIU itself. The customer is responsible for everything past the NIU, unless the equipment is owned by the ISP, such as with a line driver, CSU/DSU, or set-top box.
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