Connectors - NEC Electra Elite 192 Hardware Manual

Issue 6
5 - 10
3.1.4

Connectors

Before programming System Data, the battery must be
connected to CN4 to allow memory retention if a power
failure or brownout occurs. If a brownout or power failure
does occur, and the battery backup circuit is not activated,
System Data resets to the default values, all stations in
the system reset to the default values, and all data
programmed on individual stations is cleared.
When a CPUB( )-U10 ETU is installed in the system, the
clock/calendar must be set. This also applies when
battery backup fails for any reason.
When CPUB( )-U10 ETU is removed for long term
storage, disconnect the battery from CN4. This prevents
the battery from discharging completely. The fully charged
battery retains memory for approximately 21 days.
The CPUB( )-U10 ETU has the following connectors:
CN1
¥
CN2
¥
¥ CN3
CN4
¥
¥ CN5
CN6
¥
3.1.5 LED Indications
LED1 indications are listed below.
¥ Blinking Red
¥ Steady Red
Off
¥
LED2 indications are listed below.
¥ Steady Red
¥ Off
Connects to the backboard
Connects to the ISA-bus
Connects to CN2 on the EXP-U10 ETU via
the expansion cable
Connects to the memory backup battery
via the battery cable (factory installed)
Connects to CN1 of the CLKG-U10 Unit
Connects to CN2 of the CLKG-U10 Unit
Normal Operation
Operation Stopped (power on)
No Power
System Power On
No Power
Installing Electronic Telephone Units
Electra Elite