NEC UX5000, Hardware Manual, Page: 255 / 334

Chapter 4 - Terminals and Optional Equipment
Chapter 4 4 - 61
S
ECTION
4-15
POWER FAILURE TERMINALS
4.15.1
Power Failure (Figure 4-31)
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 blade failure. Power Failure Transfer is
provided by connecting to the COIU blade.
The 4COIU blade 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 Blade for Power Failure Circuits
RJ61 Cable Connector - CN3, SLT Interface for Power Failure
Pin No. Connection
1 -
2 -
3 Circuit 2 - Tip
4 Circuit 1 - Ring
5 Circuit 1 - Tip
6 Circuit 2 - Ring
7 -
8 -
! Important !
When connecting the RJ61 cables to the COIU blade, note the position of the
Power Failure connector. Do not confuse this connector as the trunk connector.
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