NCI Technologies NCI - 465 WMU, Руководство пользователя

Страница: 33 / 60

NCI ‐ 465 Firmware Version 5.2.9.8 29
5.2 SELT – Single Ended Line Test
Purpose of Test:
A SELT test is performed on a vacant (non ‐ working), and open pair to allow qualification of the
pair for xDSL service. You may perform a SELT test from a cross connect point or frame toward
the customer to determine if a spare pair will support the xDSL service you wish to provide.
Customer equipment may be on loop, however DSL equipment should be removed. DSL
equipment will absorb any test signals and you will get random results. You may also perform a
SELT test from the customer NID on the spare pair to from the NID back toward the cross
connect point.
Perform the following steps to initiate a SELT test on a line under test.
Connect the test leads to the pair under test and the ground lead to a good ground. Press the
SELT key.
You now select the location you are testing from, options are Home (customers premise), OSP
(outside plant cross connect point) or Port, which is the DSLAM location. Use the right arrow
key to cycle through the options; press OK when you have selected the correct location for the
test. It is important to select the correct location; different parameters may be used in different
locations to indicate pass or fail of the test
The above screen shows the presence or absence of the micro ‐ filter, the loop length and
whether or not a fault was detected on the line.
Microfilter: Pass
SELT Len: 751ft
SELT Fault: none
[< ┘ Retest] ↓
SELT Test
Disconnect DSL equip
on line.
[Test → ]