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NT5D33 and NT5D34 Lineside E1 Interface cards Page 281 of 894
Circuit Card Description and Installation
An alarm condition is not automatically cleared until the system no longer
detects the respective bit error threshold during the corresponding duration
period.
For example, if AL1 threshold of 6 (representing 10-6) is specified, and a
duration period of 100 seconds is specified, an alarm is activated if more than
200 bit errors occur in any 100 second period. As soon as the alarm is
activated, the bit counter is reset to 0. If the next 100 seconds pass, and less
than 200 bit errors are detected, then the alarm clears after the alarm’s
duration period. However, if more than 200 bit errors are detected in the next
100 seconds, the alarm condition continues for the designated time period.
The alarm finally clears when the alarm condition is no longer detected for
the designated period, either by self-clearing (if this function is enabled), or
when the Clear Alarm (C A) command is entered.
In addition to bit errors, the Set Alarm function sets parameters for detecting
frame-slip errors by establishing a threshold necessary to activate an alarm. If
the threshold value is exceeded, a level 2 alarm is activated. The frame slip
threshold can be specified from 1 to 255 frame slips per time period. The
duration time period can be specified from 1 to 24 hours.
When entering the Set Alarm (S A) command, the MMI scrolls through the
previously described series of alarm options. These options are displayed
along with their current value, at which point a new value can be entered or
enter <CR> to retain the current value. Table 102 outlines the options
available in the Set Alarm (S A) function.
Table 102
Set alarm options (Part 1 of 2)
Option Description
AL1 Threshold Sets the allowable bit errors per second before
alarm level 1 is activated. Factory default is 6.
AL1 Duration Sets the duration in seconds (from 1 to 3,600
seconds) that alarm level 1 is activated. Factory
default is 10 seconds.