461190852L1-5, Issue 1 61190852L1-5A
3. Connect the HTU-C to the HDSL circuit by
installing a cable bet een the LP1 and LP2
signal jacks on the HDSL Installation Kit and the
HDSL circuit’s loop 1 and loop 2 t isted pairs.
Maintain signal polarity by observing the color
coding of the cable ends. Connect the CO LP1/
LP2 signal jacks to the loop 1 and loop 2 t isted
pairs, respectively, going to the remote end of the
HDSL circuit.
4. To remove an HTU-C, remove the patch cord
connecting the HTU-C to the HDSL circuit. Pull
the ejector lever on the bottom of the HTU-C, or
grasp it by its front panel and gently pull it from
the slot, observing ESD precautions.
Installing Test Cables
The HDSL Installation Kit is connected to the HDSL
circuit by installing test cables bet een the
Installation Kit’s LP1 and LP2 signal jacks and the
t isted-pair or t isted-pairs that form the HDSL
circuit. The cables are attached depending on the
installation as follo s:
• For a single-pair HDSL installation, use a test
cable ith a single-bantam end and t o alligator
clips. Insert the cable’s bantam end in the LP1
signal jack, and attach each alligator clip to one
of the ires in the t isted pair.
• For a t o-pair HDSL installation, use a test cable
ith a dual-bantam end and four alligator clips.
Insert the cable’s bantam end in the LP1/LP2
signal jacks, and attach each set of alligator clips
to the ires in the corresponding t isted-pair.
• For ADTRAN HDSL, the loops are insensitive to
tip-ring reversal. For other applications, such as
standard T1 testing, the follo ing describes the
polarity of the test set. The bantam to alligator-
clip test cables in the HDSL Installation Kit
indicate tip-and–ring connectivity as follo s:
• The alligator-clip cable ends are color-coded
black (tip) and red (ring), yello (tip) and green
(ring).
• The sleeves on the alligator-clip cable ends are
labeled to match their corresponding bantam end.
• When installing a test cable, maintain signal
polarity by matching the LP1/LP2 bantam cable
ends to the correct alligator-clip ends (LP1
bantam to loop 1 alligator slips, and LP2 bantam
to loop 2 alligator clips). It does not matter
hich t isted-pair is considered loop 1 or loop 2
as long as the designations are consistent. (See
Figure 6).
Loop 1
Loop 2
Black
Loop x (T)
Loop x (R)
Loop y (T)
Loop y (R)
Red
Yellow
Green
Figure 6. Test Cables
3. TESTING
Testing Line Units (See Figure 7)
1. Install the line unit to be tested in the appropriate
HDSL Installation Kit.
CAUTION
Before han ling line units, make sure the
HDSL Installation Kit is connecte to earth
groun an the ESD wrist strap is connecte
to the Installation Kit.
2. Verify that the other required line units are
available for the test (see Table 1). The required
line unit (s) can either be installed in another
HDSL Installation Kit, or in an HDSL circuit.
NOTE
Verify that the require line units are goo
before procee ing.
3. Install patch cables to make the necessary
connections bet een the line unit being tested
and the required line units.
If the required line unit (s) is installed in another
HDSL Installation Kit, install patch cables bet een
the LP1/LP2 signal jacks on each HDSL Installation
Kit. If the required line unit (s) is in the HDSL
circuit, install patch cables bet een the HDSL
Installation Kit’s LP1/LP2 signal jacks and the HDSL
circuit’s loop 1 and loop 2 t isted-pairs.
4. If a repeater line unit is being tested, or if the
operation of a CO line unit is being tested ith a
repeater, make sure that the repeater selection
button on the Remote Unit is IN. To perform the
test ithout the repeater, make sure the repeater
button is OUT on the Remote Installation Kit.
