Hardware manual

Issue 8 Electra Elite
5 - 156 Installing Electronic Telephone Units
7.10.2 Installation
Only one PBR( )-U( ) ETU can be installed in slots S1~S8
to provide four PBR circuits. Four circuits are built-in on
the CPUB( )-U( )for a maximum of eight PBR circuits.
7.10.3 LED Indications
Live LED indications are listed below.
Blinking Red Normal Operation
Steady Red Operation Stopped (power On)
Off No Power
LED 1 indications are listed below.
On Some circuit(s) are receiving DTMF
signaling
Off All PBR(s) are idle
7.10.4 Connectors
The PBR( )-U( ) ETU has one connector:
CN1 Connects to the backboard