NEC Electra Elite 192 Hardware Manual page 248

Issue 6
5 - 102
6.4.2 Installation
Only one PBR( )-U10 ETU can be installed in slots S1~S8
to provide four PBR circuits. Four circuits are built-in on
the CPUB( )-U10 for a maximum of eight PBR circuits.
6.4.3 LED Indications
Live LED indications are listed below.
Blinking Red
¥
Steady Red
¥
Off
¥
LED 1 indications are listed below.
On
¥
Off
¥
6.4.4 Connectors
The PBR( )-U10 ETU has one connector:
CN1
¥
Normal Operation
Operation Stopped (power On)
No Power
Some circuit(s) are receiving DTMF
signaling
All PBR(s) are idle
Connects to the backboard
Installing Electronic Telephone Units
Electra Elite