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DS1000/2000 Correspondence Course
DS2000 System Installation
NEC America
DS1000/2000 Workbook
◆
109
To test the Power Failure Telephone:
1. Connect a Power Failure Telephone. Use the following figure for
guidance.
2. Power down the system.
3. At the Power Failure Telephone, lift the handset.
You should hear dial tone on the trunk you connected.
4. Place a test call.
If power is restored while a cut-through call is in progress, the call
is maintained until the user hangs up the Power Failure Cut-
Through telephone.
Connecting a Power Failure Telephone
80000 - 40
BLK
YEL
GRN
RED
To Power
Failure
Telephone
connector on
ATRU PCB
Power
Failure
Telephone
25 Pair
Installation Cable
Station
Block
Cross
Connect
Block
8-Pin
Connector
BLU-WHT
WHT-BLU
625
Modular
Jack
One-Pair Cross-Connect