Power Failure Telephones; Power Failure (Figure 4-19); Connector Pin-Outs On Coiu Pcb For Power Failure Circuits - NEC UX5000 Hardware Manual

S 4-15
ECTION

POWER FAILURE TELEPHONES

4.15.1

Power Failure (Figure 4-19)

The system allows connection for basic telephone service during a power failure. The power failure operation
occurs during a commercial power failure, and is not affected by PCB failure. Power Failure Transfer is
provided by connecting to the COIU PCB.
The 4COIU PCB provides 2 Power Failure Transfer circuits. The CN3 connector provides connection to 2
analog trunk ports, which are polarity sensitive (tip to tip, ring to ring). The power failure circuits, however,
are not polarity sensitive.
4.15.2

Connector Pin-Outs on COIU PCB for Power Failure Circuits

Chapter 4
When connecting the RJ61 cables to the COIU PCB, note the position of the
Power Failure connector. Do not confuse this connector as the trunk connector.
RJ61 Cable Connector - CN3, SLT Interface for Power Failure
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Chapter 4 - Telephones and Optional Equipment
! Important !
Pin No.
1
2
3
4
5
6
7
8
Connection
-
-
Circuit 2 - Tip
Circuit 1 - Ring
Circuit 1 - Tip
Circuit 2 - Ring
-
-
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