PairGain PG-Flex, Manual

Page: 51 / 168

Installing the Central Office Terminal Equipment
43
Connect Bypass Pairs
If subscriber drop testing is required, connect the metallic bypass pairs to the COT shelf backplane
as shown in Figure 21. The bypass pairs can either be connected directly to each PG-Flex system,
or can be cascaded between other PG-Flex systems
.
Individual Bypass Pairs
To connect the bypass pairs directly to each system, do the following:
1
For System n, connect the metallic bypass pair from the main distribution frame (MDF) to wire
wrap posts BYPASS_n_T (Tip) and BYPASS_n_R (Ring) on the COT shelf.
2
Repeat step 1 for each system installed.
Shared Bypass Pairs
To cascade bypass pairs between PG-Flex systems, do the following:
1
Connect the metallic bypass pair from the MDF to wire wrap posts BYPASS_n_T (Tip) and
BYPASS_n_R (Ring) on the first COT shelf in the cascade.
2
Connect the metallic bypass pair BYPASS_n_T (Tip) and BYPASS_n_R (Ring) on the first
COT shelf in the cascade to the next bypass pair in the cascaded system.
3
Connect the INHIBIT line from the first COT shelf in the system to the next COT shelf in the
cascade.
4
Repeat steps 2 and 3 for each PG-Flex system in the cascade.
For the following procedure, n is 1 for System 1, 2 for System 2, 3 for System 3, and 4 for System 4.
When metallic bypass pairs are cascaded between PG-Flex COT shelves or to other digital loop
carrier (DLC) systems, the INHIBIT line must also be shared between the cascaded systems.