CopperOptics 150-2618-01, Руководство пользователя

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950-818-100-01, Revision 01 Installation Procedures
PCS-818 List 1 November 30, 1999 15
HDSL Wiring
Each COLU shelf slot has wiring to support four HDSL interfaces A, B, C, and D. These interfaces terminate on
wire wrap pins.
COLUs that provide an HDSL interface (for example, PLL-820, PLL-821) utilize the "A" interface.
1 Connect the tip wiring to the A interface "T" pin.
2 Connect the ring wiring to the A interface "R" pin.
External ACO Connection
The ACO connection is made on the pins labeled ACO RET and EXT ACO. To control the ACO remotely,
momentarily connect the ACO RET and the EXT ACO pins.
T
URN
-U
P AND
T
EST
1 Verify correct termination of all the HDSL lines on the wire-wrap field on the COT shelf backplane.
2 Install the fuses in the CO fuse panel for the circuits providing –48 Vdc power to the COT shelf. Observe that
the fuses will not blow when installed.
3 Verify that there is between –42 Vdc and –56 Vdc between each of the –48 Vdc terminals and BAT RTN on
TB1 on the COT shelf backplane.
4 Measure the dc voltage across the HDSL terminations. Ensure that there are 0 Vdc between the Tip and Ring,
Tip and Ground, and Ring and Ground of each HDSL circuit terminated on the COT 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 COT
shelf backplane.
6 Optional - Refer to the PSU-795 Technical Practice for verifying the COT shelf installation.
Perform the following steps before you install circuit cards in the COT shelf.