Nortel Networks Circuit Card 311 - Manual (Page 238)

238 NT5D11 and NT5D14 Lineside T1 Interface cards
continues for the designated duration period. The alarm finally clears when
the alarm condition is no longer detected for the designated duration period
either by self-clearing (if this function is enabled), or when the Clear Alarm
(C A) command set is entered.
In addition to bit errors, the Set Alarm function configures 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 command set, the MMI scrolls through the
previously described series of alarm options. These options are displayed
along with their current value. Enter a new value or press Enter to retain the
current value.
Table 106 "Set alarm options" (page 238) outlines the options
available in the Set Alarm function.
Table 106
Set alarm options
Option Description
AL1 Threshold Sets the allowable bit errors per second (from 3 to 9) before alarm level 1 is
activated. Factory default is 10
–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.
AL2 Threshold Sets the allowable bit errors per second (from 3 to 9) before alarm level 2 is
activated. Factory default is 10
-5 .
AL2 Duration Sets the duration in seconds (from 1 to 3,600 seconds) that alarm level 2 is
activated. Factory default is 10 seconds.
Frame Slip
Threshold Sets the allowable frame slips per time period (from 1 to 255) before alarm level
2 is activated. Factory default is 5.
Frame Slip
Duration 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 Lineside T1 card can be
slow to return to service automatically even when the carrier is no longer
experiencing any errors. The Clear Alarm command must be entered
manually to restore service promptly. To avoid this, the duration period
should normally be set to 10 seconds.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.