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2. Grasp the HTU-R by its front panel and align it
with the guides in the slot. Slide the line unit into
the slot until it seats firmly with the connector at
the rear.
3. Connect it to the HDSL circuit by installing a
cable between the LP1 and LP2 signal jacks on
the HDSL Installation Kit and the HDSL circuit's
loop 1 and loop 2 twisted pairs. Maintain signal
polarity by observing the color coding of the
cable ends. ADTRAN HDSL units are
insensitive to either loop or pair reversals.
• Repeater line unit - Connect the repeater input
LP1/LP2 signal jacks to the loop 1 and loop 2
twisted pairs, respectively, from the central
office end of the HDSL circuit. Connect the
repeater output LP1/LP2 signal jacks to the
loop 1 and loop 2 twisted pairs, respectively,
going to the remote end of the HDSL circuit.
NOTE
If the remote line unit is installed in the HDSL
Remote Installation Kit, the Installation Kit's
internal circuitry completes the connection
between the repeater output LP1/LP2 signal
jacks and the remote line unit.
• Remote line unit – connect the remote LP1/
LP2 signal jacks to the loop 1 and loop 2
twisted pairs, respectively, coming from the
central office end of the HDSL circuit.
4. To remove an HTU-R, remove the patch cord
connecting the line unit to the HDSL circuit. Pull
the ejector lever on the bottom of the HTU-R, or
grasp the line unit 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 between the
Installation Kit's LP1 and LP2 signal jacks and the
twisted-pair or twisted-pairs that form the HDSL
circuit. The cables are attached depending on the
installation as follows:
• For a single-pair HDSL installation, use a test
cable with a single-bantam end and two alligator
clips. Insert the cable's bantam end in the LP1
signal jack, and attach each alligator clip to one
of the wires in he twisted pair.
4
• For a two-pair HDSL installation, use a test cable
with 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 wires in the corresponding twisted-pair.
For ADTRAN HDSL, the loops are insensitive to tip-
ring reversal. For other applications, such a standard
T1 testing, the following 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 follows:
• The alligator-clip cable ends are color-coded
black (tip) and red (ring), yellow (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
which twisted-pair is considered loop 1 or loop 2
as long as the designations are consistent. See
Figure 4.
Loop 1
Loop 2
3. TESTING
Testing Line Units (See Figure 5)
This section describes the method for testing HDSL
line units. The steps are as follows:
1. Install the line unit to be tested in the appropriate
HDSL Installation Kit.
Before handling line units, make sure the
HDSL Installation Kit is connected to earth
ground and the ESD wrist strap is connected
to the Installation Kit.
61190851L1-5, Issue 1
Black
Red
Yellow
Green
Figure 4. Test Cable
CAUTION
61190851L1-5A
Loop x (T)
Loop x (R)
Loop y (T)
Loop y (R)
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