jefrhi236
join:2002-07-05
Spring, TX
| The board in the NID is referred to as a Smart Jack.
That unit specifically is an Adtran H4TU-R. That stands for HDSL(High-Frequency Digital Subsciber Line)4-Wire Remote, meaning it uses 2 pairs of copper to get the loop to the premise.
There is another unit in the CO that is an H4TU-C, or office repeater.
The 2 units sync with one another and create 2 768 Kb loops combined to make the 1.536 Mb T-1 pipe. Inside the span itself, they communicate using 2B1Q encoding, once the data reaches the prem, the encoding is stripped off and returned to the original DS-1 signal.
The units both have performance monitoring ability and remote loopback features to allow testing of the loop remotely by either the ISP or Telco.
OK, Lesson over!
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