Christopher Woodfield wrote: I think we can probably chalk this up to a difference in dialect, for lack of a better word...what you're calling an NIU is exactly what I would call a smartjack and vice versa. Can you point to any sort of "official" documentation that defines these?

Christopher Woodfield wrote: the smartjack has alarm lights and can be remotely looped by the telco via ESF loopcodes;

I have never seen an NUI (even antique ones, which did not have loopback capabilities) that was a dumb wiring box. Below are some examples of what people actually call an NIU: http://arneill-py.sacramento.ca.us/docs/3125.pdf http://www.charlesindustries.com/NIU%20400-Size.pdf As you can see, none of them feature any RJ48 jack.

Christopher Woodfield wrote: the NIU (also known as an RJ48X) is the dumb wiring box.

It is _not_ also known as an RJ48X. Below are some examples of RJ48X products: http://www.twacomm.com/Catalog/Model_AT635CX.htm http://www.suttleonline.com/trad_jacks_sfcmount.html http://www.figment.ca/Networking/Premise/PDFs/Section%20B/b9.pdf?catid=2 08 http://www.psigroup.ca/products/section-a/a9-2.htm Michel.