7
61190851L2-5, Issue 3
61190851L2-5C
1. Install an HDSL remote line unit in the HDSL
Installation Kit. 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 cable.
• Connect the remote LP1 signal jack to the
loop 1 twisted pair.
• Connect the remote LP2 signal jack to the
loop 2 twisted pair.
3. When power is applied to the HDSL circuit, the
HDSL Installation Kit can be used to test remote
line units, or the LP1/LP2 signal jacks can be
used to access the circuit’s loop 1 and loop 2
signals.
T1 BERT Testing of an HDSL Circuit
This section describes how to perform a T1 Bit Error
Rate Test (BERT) using an HDSL Installation Kit and
a T1 BERT tester (See
Figure 9
).
With a single HDSL Installation Kit and T1 BERT
tester, a loopback test of the cable span can be
performed from the central office end or from the
remote end.
With CO and Remote HDSL Installation Kits and two
BERT testers, an end-to-end test of the entire cable
span can be performed. The directions for performing
the BERT test are as follows.
1. Install test cables to make the following
connections between the T1 BERT tester and the
HTU-C installed in the HDSL Installation Kit.
For an end-to-end test, make the connections at
both ends of the cable span.
• Connect the BERT tester’s DSX-1 RX jack to
the DS1 line receive jack on the front panel of
the HTU-C or HTU-R
• Connect the BERT testers DSX-1 TX jack to
the DS1 line transmit jack on the front panel
of the HTU-C or HTU-R.
NOTE
As an alternative to the DS1 signal jacks, use the
DS1 RX and TX jacks located just above the line
unit slot on the HDSL Installation Kit. These
jacks correspond to line unit operation, which
means that the BERT tester’s DS1 transmit jack
must be connected to the installation kit’s DS1
TX jack, and the tester’s DS1 receive jack to the
installation kit’s DS1 RX jack.
2. Install a test cable to connect the HDSL
Installation Kit to the HDSL circuit. For an
end-to-end test, make the connections at both
ends of the cable span.
• Connect the HDSL Installation Kit LP1
signal jack to the loop 1 twisted pair.
• Connect the HDSL Installation Kit LP2
signal jack to the loop 2 twisted pair.
3. If a loopback BERT test is being performed, loop
back the far end.
4. Turn ON the HDSL Installation Kit and T1
BERT tester. If an end-to-end test is being run,
turn on both Installation Kits and testers.
5. Run a T1 BERT test over the HDSL cable span.
Figure 9. T1 BERT Testing of an HDSL Circuit
Remote/Repeater Shelf
End-to-End BERT
Serving Office
DS1 Receive
DS1 Transmit
Central Office Powering Shelf
LP1/LP2
LP1/LP2
Customer
Equipment
HDSL
Circuit
CAUTION:
RISK OF ELECT
RICAL
SHOCK. MAXI
MUM
VOLTAGES UP T
O
-200 VDC MAY
BE
PRESENT ON T
ELECOM
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
RX TX
RPTR
IN
OUT
T1 BERT
Tester
CAUTION:
RISK OF ELEC
TRICAL
SHOCK. MAX
IMUM
VOLTAGES UP
TO
-200 VDC MA
Y BE
PRESENT ON T
ELECOM
CIRCUITS.
1190852L2
HDSL 852 CO
POWER
REMOTE
LP1 LP2
DS1
TX RX
ESD
GND
DSX-1
LBO
B8ZS
FRM
ESF
NIU LB DIS
LB TIMEOUT
DIS
533
399
266
133
0
EXT
1246001L
2
LBK
ALM
DSX
DSL
TX
RX
TX
RX
M
O
N
E
Q
HTU-C
M
AMI
UFRM
SF
EN
EN
1234
5
T1 BERT
Tester
DS1 Receive
DS1 Transmit
Serving Office
T1 BERT
Tester
DS1 Receive
DS1 Transmit
Central Office Powering Shelf
Loopback BERT
LP1/LP2 Signals
HDSL
Circuit
CAUTION:
RISK OF ELEC
TRICAL
SHOCK. MAX
IMUM
VOLTAGES UP
TO
-200 VDC MA
Y BE
PRESENT ON T
ELECOM
CIRCUITS.
1190852L2
HDSL 852 CO
POWER
REMOTE
LP1 LP2
DS1
TX RX
ESD
GND
DSX-1
LBO
B8ZS
FRM
ESF
NIU LB DIS
LB TIMEOUT
DIS
533
399
266
133
0
EXT
1246001L
2
LBK
ALM
DSX
DSL
TX
RX
TX
RX
M
O
N
E
Q
HTU-C
M
AMI
UFRM
SF
EN
EN
1234
5
Remote End
Loopback
