Figure A: A single point on the NetGuardian 832A consumes two pins on the amphenol and a pair of 66-block rows.
Figure B: Each alarm on the 864 takes up only one pin on the amphenol and half a 66-block pair, tied to GND on row A25.
Note: DPS Telecom recommends terminating alarms for NetGuardian 864A units with split 66-block termination.
Things to Consider
Are you using Straight or Split 66-blocks?
If terminating alarms with split 66-blocks, you will need two blocks, one for each amphenol. A split 66-block means that the two terminals on the left side of the block on each row are electrically isolated (split) from the two right terminals.
If terminating alarms with straight 66-blocks, you will need four total blocks, two for each amphenol.
Figure C: A 50-pin split 66-block with rows labeled A1 - S25.
How to Terminate a 66-Block
Remove bridging clips on alarm rows.
Remove clips on rows A1-S24 on the block joined to the first amphenol.
Remove clips on rows A1-S8 on the block joined to the second amphenol.
See Figure C for an example of a split block without bridging clips and rows labeled.
Connect the alarm return path to row A25 on your block.
Bridge the center terminals on row A25 of your block.
Row A25 now constitutes a common return path for your discrete alarms.
Figure D: Ground termination on a split 66-block for the NetGuardian 864A.
Wire row A25 to the left terminal for discrete alarm rows.
On the block tied to the first amphenol, wire the RTN path to rows A1-S24.
On the block tied to the second amphenol, wire the RTN path to rows A1-S8.
Connect wires to your alarms (may require a punch down tool).
Your 864A 66-block should be wired as shown in this diagram:
Figure E: 66-block diagram for discrete alarms 1-48 on the NetGuardian 864A.
Figure F: 66-block termination diagram for discrete alarms 49-64 on the NetGuardian 864A.
For Straight 66-Block Termination
Note: Because rows on a straight block are not electrically separate, you cannot terminate both the return path and alarm on the same row of a straight block. For straight block termination to an 864A model, you will need four total blocks, two for alarms and two extra blocks to denote the return/ground path. See Figure G at the end of this documentation for an example of straight 66-block wiring.
Disconnect the return path for all alarms.
You will reconnect the return path to your gear on another block.
Connect two new blocks to the return/ground path.
Connect a single row to the return/ground path.
Bus rows A1-A25 together.
You will not connect these blocks directly to the 864A unit.
Connect your Return path blocks to your alarm blocks.
Connect rows A25 on the ground blocks to row A25 on your blocks terminating alarms. See Figure G for an example.
Reorganize alarms on your original two blocks.
Re-wire each row accordingly and in order. (The diagrams above, discounting the RTN bus, show the order of alarms, 1-48 and 49-64). Note that each alarm will move up several rows equal to the alarm number minus 1.
Figure G: Straight 66-block diagram for wiring alarms on a NetGuardian 864A.
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