Nortel NT1R20 Description page 141

Table 29
Set alarm options
Option
AL1 Threshold
AL1 Duration
AL2 Threshold
AL2 Duration
Frame Slip Threshold
Frame Slip Duration
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 will be 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 command set, the MMI will scroll through the
previously described series of alarm options. These options are displayed
along with their current value, and you can either enter a new value or hit
enter to retain the current value. Table 29 outlines the options available in the
Set Alarm function.
Sets the allowable bit errors per second (from 3 to 9) before alarm
level 1 is activated. Factory default is 10
Sets the duration in seconds (from 1 to 3,600 seconds) that alarm
level 1 is activated. Factory default is 10 seconds.
Sets the allowable bit errors per second (from 3 to 9) before alarm
level 2 is activated. Factory default is 10
Sets the duration in seconds (from 1 to 3,600 seconds) that alarm
level 2 is activated. Factory default is 10 seconds
Sets the allowable frame slips per time period (from 1 to 255) before
alarm level 2 is activated. Factory default is 5.
Sets the duration in hours (from 1 to 24) that the frame slips are
counted. After this time period, the counter is reset to 0. Factory default
is 2 hours.
Note: If the duration period is set too long, the line-side T1 card will be
slow to return to service automatically even when the carrier is no longer
experiencing any errors. The Clear Alarm command will have to be
entered manually to restore service promptly. To avoid this, the duration
period should normally be set to 10 seconds.
NT5D11 Line-side T1 Interface Card
Description
Page 117 of 290
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Line cards Description