115
FieldSmart
®
Fiber Active Cabinet (FAC) 900
__________________________________________________________
Installation Manual
Direct: 763.476.6866 • National: 800.422.2537 • www.SeeClearfield.com • techsupport@clfd.net
Manual 020420 REV B - April 2019
Step 1:
Step 2:
Step 3:
Step 4:
Installing a Protection Block
You can increase the cabinet's copper line protection capacity in the field to support expansion equipment. Protection blocks
are housed in mounting frames that each hold up to eight 50-pair blocks.
Note:
Clearfield equipment uses a 'dead pair' scheme, where the 25th pair on each subscriber interface and in each 25-pair
cable group is unterminated (dead). Therefore, on each protection block, positions 25 and 50 are not wired. Line identifica
-
tion labels cover the dead pair positions (25 and 50).
To install a protection block
Unpack the protection block from the shipping packaging.
On the back of the protection block, remove any cable ties that coil up the interface cables (two with MS2 or
710 connectors, two with RJ-21 connectors).
In the cabinet or EXM, locate the next open position on the protection mounting frame, then feed the block's
interface cables through the fixture into the area behind it. Populate protection blocks from left to right on the
frame.
Note:
For equipment overlay service units, where the line protection for the user and overlay lines is split
across two adjacent 50-pair blocks, typically the block on the left protects the PSTN (overlay) lines, while the
block on the right protects the user (DSL) lines.
Attach the protection block to the mounting frame as follows:
a.
Insert the tabs on the left side of the block into the slots on the mounting frame.
