Ericsson TT1222 User's Guide Page 67

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Alarms/GPOs
The relay is energised in the non-alarm condition, such that an alarm is indicated
upon power failure.
In addition, the TT1222 supports five configurable general purpose output pins. The
GPO outputs are logic level outputs only and are active high.
Table 6.2: GPO Levels
State Output
Low Open drain output (which can sink a maximum of 30mA)
High 5 Volts
The outputs are not suitable for driving general purpose 5 V relays which have a coil
resistance of less than 167 .
The GPOs cannot be activated on power failure.
6.4.2 Configuring Alarms
The TT1222 monitors numerous possible error conditions. All of these conditions
generate error messages, which are user-configurable. Each message may be
given three different states of severity:
Ignore
Warning
Alarm
Note: By sorting these alarm messages into these three different categories, you
can avoid unnecessary alarm situations; for example missing Teletext in a
service with only video and audio.
The alarms can be configured via Front Panel, Ericsson RS-232 and Web Browser.
Below is an example of setting up the alarms using the front panel.
6.4.2.1 Changing the Alarm Configuration via the Front Panel
The alarm messages are sorted into eight different categories, described in Table
6.3. The alarm messages associated with each category are described in Annex D,
Alarm Categories and Conditions.
Table 6.3: Alarm Categories
Category Description
Input Alarms relating to the input signal strength, sync etc.
PSI Alarms relating to errors in the PSI, missing PSI etc.
CA Alarms relating to the CA system and the descrambling.
EN/LZT 790 0002/2 R1A
6-5
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