Power Failure Telephone; Power Failure Cut-Through - NEC DS2000 Hardware Manual

Power Failure Telephone

Power Failure Telephone

Power Failure Cut-Through

When AC power fails, the system can automatically cut through to a Power Failure Telephone connection.
To install Power Failure Cut-Through (Figure 4-4):
1. Locate an available 8-pin jack in a trunk (A) block or station (B) block.
2. For the 8-pin jack chosen, cross-connect the associated wire pair from the A or B block to the cross-
connect block.
3. Install a modular jack for each Power Failure Telephone within 6 feet of the telephone's location.
4. For each Power Failure Telephone, run one-pair of 24 AWG station cable from the cross-connect block
to the telephone's modular jack.
5. Terminate the station cable WHT/BLU - BLU/WHT leads to the RED and GRN lugs in the modular
jack.
6. Install bridging clips as required.
To test the Power Failure Telephone:
1. Connect the power failure telephone. See the illustration below.
2. Power down the system.
3. At the Power Failure Telephone, lift the handset.
4. Place a test call.
8-Pin
Connector
4-4 N Section 4: Optional Equipment
Local codes may prevent you from using a DDK connector on the A block for optional equipment.
You should hear dial tone on the trunk you connected.
If power is restored while a cut-through call is in progress, the call is maintained until the user
hangs up the Power Failure Telephone.
To Power
Failure
Telephone
connector on
ATRU PCB
25 Pair
Installation Cable
Figure 4-4: Connecting a Power Failure Telephone
One-Pair Cross-Connect
Station Cross
Block Connect
Block
Power
Failure
Telephone
WHT-BLU BLU-WHT
GRN RED
BLK YEL
625
Modular
Jack
DS2000 Hardware Manual