NEC Electra Elite 192 Hardware Manual page 243

Electra Elite
System Hardware Manual
6.3 ECR-U10 ETU
6.3.1 Description
The ECR-U10 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.
6.3.2 Installation
Only one ECR-U10 can be installed in slots S1~S8 in the
basic KSU.
6.3.3 LED Indications
Live LED indications are listed below.
¥
¥
¥
Busy LED indications are listed below.
¥
¥
Blinking Red Normal Operation
Steady Red Operation Stopped (power On)
Off No Power
Steady Red Some Relays Are Busy
Off All Relays Are Idle
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