Hardware manual

Issue 8 Electra Elite
5 - 132 Installing Electronic Telephone Units
7.4 ECR-U( ) ETU
7.4.1 Description
The ECR-U( ) ETU provides external relay control for
Zone Paging systems (3 relays), External Ringing control
(4 relays), Night Chime ringing control (1 relay), and two
general purpose relays.
There are two audio jacks. One provides the both-way
audio-for-paging system. The other provides a tone
output for External Tone Ringing and Night Chime.
7.4.2 Installation
Only one ECR-U( ) can be installed in slots S1~S8 in the
system.
7.4.3 LED Indications
Live LED indications are listed below.
Blinking Red Normal Operation
Steady Red Operation Stopped (power On)
Off No Power
Busy LED indications are listed below.
Steady Red Some Relays Are Busy
Off All Relays Are Idle