Nortel Circuit Card, Installation Manual, Page: 235 / 908

NT5D11 and NT5D14 Lineside T1 Interface cards Page 235 of 906
Circuit Card Description and Installation
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. Enter a new value or press Enter to retain the
current value. Table 90 outlines the options available in the Set Alarm
function.
Note: If the duration period is set too long, the lineside 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.
Set Clearing
Use the Set Clearing (S C) command set to enable or disable alarm
self-clearing. Answer Y or N to the question: “Enable Self Clearing? (YES or
NO)”. If “Enable Self-Clearing” is chosen (the factory default condition), the
system will automatically clear alarms after the alarm condition is no longer
detected for the corresponding duration period.
Table 90
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.