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

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 4-6):
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 six 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.
hangs up the Power Failure Telephone.
8-Pin
Connector
DS2000 Hardware Manual
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
One-Pair Cross-Connect
To Power
Failure
Telephone
connector on
ATRU PCB
25 Pair
Installation Cable
Figure 4-6: Connecting a Power Failure Telephone
Power Failure Telephone
Station Cross
Block Connect
Block
Power
Failure
Telephone
Section 4: Optional Equipment
WHT-BLU BLU-WHT
GRN RED
BLK YEL
625
Modular
Jack
4
4-7