Talk:Network interface device

Is NIU commonly shortened to NI by service providers?

(Response) Yes, it is. Flagmichael 02:25, 30 March 2007 (UTC)[reply]

Loopback

I still have doubts about the correctness of the statement about loopback testing. When I ordered a T1 connection from AT&T in 2007, they gave me a loopback plug to plug into my CSU. When that test failed, they had me plug it into the smartjack. Why would they ask me to do that if they could initiate a loopback test from the CO? We need a reliable source that truly states that, or that statement should be removed. Of course you can initiate a loopback test if you use a loopback plug; it is not necessarily a quality inherent in the smarkjack itself. -- Schapel (talk) 21:40, 9 February 2008 (UTC)[reply]

The loopback test loops the front of the smartjack, the loopback plug tests through the smartjack, to make sure the jack is wired correctly, and is not defective itself. The loopback plug isn't a very good test too, cause it only tests half the pairs (There's 4 wires used, tip and ring on both send and recieve pairs). You use loopback plugs to test extended demarks (They use "biscut jacks" and not NIUs) a lot, but again, this isn't a good test cause you can have the pairs rolled, and really need something like a T-BERD unit. So most likely what happened, it tested good to the smartjack, and they wanted to test through the smartjack to make sure they wired it correctly in the back, or, what you're looking at was actualy a demarc extension they thought they might have wired wrong.

Course, this entire page needs reworked. I'm not 100% sure what is meant by the part about transmission protocols part.63.87.129.138 (talk) 23:00, 9 February 2008 (UTC)[reply]

Also, if you plugged the loopback into your CSU, and it FAILED, then your CSU was bad. I think you might be mixed up on something, cause a CSU with a loopback plug in it should come up\up(Looped)63.87.129.138 (talk) 00:01, 10 February 2008 (UTC)[reply]