Section 1: General Information
Instruction Manual 8144-DD/075020
Page 1-5
1.6.5 Status
Indicators
The red MAJOR ALARM lamp is latched on for the following conditions:
LOS
Loss of DS1 reference signal on both inputs.
AIS
An Alarm Indication Signal on both reference inputs if
AIS is enabled for both inputs.
EXTERNAL ALARM INPUT
An External Alarm Input on both alarm inputs.
The red MINOR ALARM lamp is latched for the following conditions:
LOS
Loss of DS1 reference signal on one input.
AIS
An Alarm Indication Signal on one reference input if
AIS is enabled.
EXTERNAL ALARM INPUT
An External Alarm Input on one alarm input.
READY A/B
The green lamps indicate that clock input at A and/or B is available and that the
corresponding alarm input is not activated.
SELECTED A/B
The green lamps indicate that the A or B clock input has been selected.
1.6.6 Operator
Controls
RESET:
A momentary contact switch that resets latched MAJOR and
MINOR alarms
ACO: Alarm Cut Off. A momentary contact switch that removes the
remote alarm condition (unlatches the alarm relays).
AUTO/MANUAL:
Enables automatic switchover or manual selection of references.
PWR
Turns power ON or OFF. Switch must be pulled out to toggle.
