Ericsson TT1222 User's Guide Page 66

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Alarms/GPOs
Step Action Result
2.
Scroll up and down through the
alarm categories.
Each category will show its status; OK,
WARNING or ALARM.
3.
To check the alarm state of an
individual alarm, right-click on a
category showing a warning or
alarm state.
This will show a list of all current alarms
generating a warning or alarm message
within the currently selected alarm category.
For further explanation of the status menu, refer to Annex C, Front Panel LCD
Menus.
For description of all the alarm messages, refer to Annex D, Alarm Categories and
Conditions.
6.4 Alarm Relay
The Relay/GPO connector, located on the rear panel, provides a summary alarm
relay contact that may be used to trigger external devices. Details of the connector
are provided in Chapter 2, Installing the Equipment.
A summary alarm signal generated when one or more of the individual monitored
alarm conditions are active. The receiver allows masking of unwanted alarm
conditions so that they do not contribute to the summary alarm. The alarm list
depends on the unit model, i.e. which input module is fitted (QPSK or ASI), which
output module is fitted, etc.
Configuration of the alarms is possible via the Front Panel, Ericsson RS-232 and
Web Browser. The state of the summary alarm relay also corresponds to the front
panel status LED.
6.4.1 Relay/GPO Connector
The TT1222 rear panel is fitted with 9-way D-type female connector.
1
5
6
ALARM
9
Figure 6.1: Relay/GPO Connector
The relay is a single pole change-over relay with all three contacts available at the
output connector. The contacts are fully isolated from each other, and from chassis
ground. They are rated at 1 A max at 24 V DC.
EN/LZT 790 0002/2 R1A
6-4
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