Revision 03
August 22, 1997
Section 950-719-100
Page 34
PairGain Engineering - Plant Series
PG-Plus PCS-719
External ACO Connection
The ACO connection is made on the pin labeled EXT ACO as shown in Figure 12. To control the ACO remotely,
connect the ACO to GROUND through a Normally Open, momentary contact switch.
Figure 12 External ACO Wire-Wrap Connections
T
URN
-U
P
AND
T
EST
1
Verify correct termination of all the HDSL lines on the wire-wrap field on the shelf backplane.
2
Install the fuses in the CO fuse panel for the circuits providing -48 V dc power to the COTS. Observe that
the fuses hold when installed.
3
Verify that there is between -42 V dc and -56 V dc between each of the -48 V dc terminals and GND on TB1
on the COTS backplane.
4
Measure the dc voltage across the HDSL terminations. Ensure that there are 0 V dc between the Tip and
Ring, Tip and Ground, and Ring and Ground of each HDSL circuit terminated on the shelf.
5
Measure the resistance across the terminals of the HDSL pairs. There should be at least 100 k
Ω
of resistance
across the Tip and Ring, Tip and Ground, and Ring and Ground of each HDSL circuit terminated on the
COTS backplane.
6
Replace the clear Plexiglas cover on the back of the COTS.
The following steps should be performed before any circuit cards are installed in the COTS.
Summary of Contents for Pairain PG-Plus PCS-719
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