207.1 Validation Data

The characteristic data of an alarm are THRESHOLD1, THRESHOLD2, TIME1, TIME2, TIME, PRIORITY and HWCONT (alarm-contact).

There are the following alarm levels : Major (urgent), minor (not-urgent) alarm and device alarm (single device alarm). Each alarm level is defined by its validation data.

The validation data of minor alarm are THRESHOLD1 and TIME1 (validation time), the validation data of major alarm are THRESHOLD2 and TIME2. The respective alarm level is indicated, when the error counter assigned to the alarm has reached or exceeded the threshold value continously during the specified validation time. This ensures that ’sporadic’ faults are not indicated. Alternatively, the alarm will only be deactivated if the respective threshold value is not reached during the whole validation time. The threshold values of central alarms are defined as absolute values, the threshold values of peripheral or logical alarms are defined in percent of the count of relevant units. The difference between major and minor alarm is only that THRESOLD2 must be greater then THRESHOLD1. The major or minor alarm can be deactivated, when its threshold is set to 65535. This can be done by call of either CHANGE-VADSU or DEACTIVATE-VADSU.

The most alarms have the device alarm (single device alarm) as a third alarm level. Its purpose it to indicate failed units below the threshold level of major/ minor alarm. The two differences between the validation data of major / minor alarm and device alarm are the following : The threshold of device alarm is always equal to one unit and its validation time (TIME) can be much longer (255 hours instead of 65535 seconds). So the device alarm is indicated when at least one unit is defect during a long period. The device alarm can be deactivated, when its validation time is set to 0 (this is possible by CHANGE-VADSU only).

A global filter for alarm messages has been added to the system to prevent not-service-relevant messages. AMO-SIGNL defines the minimum priority of the alarms which are forwarded by SIT. The PRIORITY of each single SWU alarm can be changed by AMO-VADSU. Its default value is 0 (lowest priority).

Alarms can also be signalized by LEDs. The parameter ’HWCONT’ defines, which LEDs are assigned to which alarm(s). Normally HWCONT = SU for all alarms. This means : When at least one minor alarm is active, the LEDs ’P2’ on IOP and ’NAL’ on DP are in state ’on’ and when at least one major alarm is active, the LEDs ’C3’ on IOP and ’UAL’ on DP are in state ’on’ (summary signalisation). But when HWCONT is set to S1 for one (or more) alarm(s), ’P2’ and ’NAL’ are in state ’on’ only when this (or these) alarm(s) are active and when HWCONT is set to S2 for one (or more) alarm(s), the LEDs ’C3’ and ’UAL’ are in state ’on’ only when this (or these) alarm(s) are active.

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