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6
Adding a Repeater to an HDSL Circuit
This section describes the procedure for adding a
repeater into a circuit to verify the operation of a
currently installed repeater, or to determine whether
the cable span might work better with a repeater (See
Figure 7
).
4. Place the repeater selection button IN to insert
the HDSL Remote Installation Kit repeater into
the circuit. Place the repeater selection button
OUT to remove the repeater from the circuit.
5. When power is applied to the HDSL circuit, the
HDSL Remote Installation Kit can be used to test
repeater line units, or the LP1/LP2 signal jacks
can be used to access the circuit’s loop 1 and
loop 2 signals.
NOTE
The repeater selection button (IN/OUT) can be
used to observe the operation of the HDSL
circuit with and without a repeater.
Accessing an HDSL Circuit from the Remote
End
The HDSL Remote Installation Kit can be used to
access the HDSL circuit from the remote end, or to
simulate the remote end for testing purposes (See
Figure 8
).
The process is as follows:
WARNING
On a live HDSL circuit, potentially dangerous
voltage may be present on the loop 1 and loop 2
signals. Use extreme caution when accessing
these signals.
Figure 8. Accessing an HDSL Circuit
from the Remote End
Remote Installation Kit
CO Unit
HDSL Cable Pairs
Customer
Equipment
or NIU
CAUTION:
RISK OF ELECT
RICAL
SHOCK. MAXI
MUM
VOLTAGES UP
TO
-200 VDC MAY
BE
PRESENT ON T
ELECOM
CIRCUITS.
1190851L2
HDSL 851
REPEATER/
REM
OTE
ESD
GND
RPTR. C.O.
CABLE PAIRS
RPTR. TO REMOT
E
CABLE PAIRS
LP1 LP2
LP1 LP2
REMOTE
CABLE PAIRS
DS1
LP1 LP2
LP1 LP2
RPTR
IN
OUT
To perform this procedure, access to the cable span at
a midpoint, such as a cross-connect, must be obtained.
The steps are as follows:
WARNING
On a live HDSL circuit, potentially dangerous
voltage may be present on the loop 1 and loop 2
signals. Use extreme caution when accessing
these signals.
1. Install an HDSL repeater line unit in the Remote
Installation Kit. Before handling the line unit,
make sure the HDSL assistant is connected to
ground and the ESD wrist strap is connected to
the installation kit.
2. Install a test cable to make the following
connections. Be sure to maintain signal polarity
with the test cables. Connect the repeater central
office side LP1 signal jack to the loop 1 twisted
pair from the central office end, and connect the
repeater central office side LP2 signal jack to the
loop 2 twisted pair from the central office end.
3. Install another test cable to connect the repeater
remote LP1 signal jack to the loop 1 twisted pair
going to the remote end, and connect the repeater
remote LP2 signal jack to the loop 2 twisted pair
going to the remote.
Figure 7. Adding a Repeater to HDSL Circuit
CO Unit
Remote
HDSL Unit
Customer
Equipment
or NIU
HDSL Cable Pairs
CAUTION:
RISK OF ELECT
RICAL
SHOCK. MAXI
MUM
VOLTAGES UP T
O
-200 VDC MA
Y BE
PRESENT ON TELEC
O
M
CIRCUITS.
1190851L2
HDSL 851 REP
EATER/ REMOT
E
ESD
GND
RPTR. C.O.
CABLE PAIRS
RPTR. TO REMOT
E
CABLE PAIRS
LP1 LP2
LP1 LP2
REMOTE
CABLE PAIRS
DS1
LP1 LP2
LP1 LP2
RPTR
IN
OUT
1246041
L1
PWR
LP1
LP2
LP1
LP2
LBK
