Turn-Up and Test
SCP-PCS718-010-06H
44
January 6, 2003
PCS-718 List 1
External ACO Connection
The ACO connection is located to the left handed side of the pin labeled EXT ACO as shown in
control the ACO remotely, connect the ACO to GROUND through a Normally Open, momentary contact switch.
Figure 13.
Connecting the External ACO Switch
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 fuse(s) in the CO fuse panel for the circuits providing –48 Vdc power to the COT shelf. Observe
that the fuses hold when installed.
3
Verify that there is between –42 Vdc and –56 Vdc between each of the –48 Vdc terminals and GND on TB1
on the COT shelf backplane.
4
Measure the dc voltage across the HDSL terminations. Ensure that there is 0 Vdc 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 HDSL terminations. Ensure that there is at least 100 k
Ω
of resistance
between the Tip and Ring, Tip and Ground, and Ring and Ground of each HDSL circuit terminated on the
shelf.
6
Replace the clear Plexiglas cover on the back of the COT shelf.
The following steps should be performed before any circuit cards are installed in the COT shelf.
