238 NT5D11 and NT5D14 Lineside T1 Interface cardscontinues for the designated duration period. The alarm finally clears whenthe alarm condition is no longer detected for the designated duration periodeither 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 fordetecting frame slip errors, by establishing a threshold necessary to activatean 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 timeperiod. The duration time period can be specified from 1 to 24 hours.When entering the Set Alarm command set, the MMI scrolls through thepreviously described series of alarm options. These options are displayedalong with their current value. Enter a new value or press Enter to retain thecurrent value. Table 106 "Set alarm options" (page 238) outlines the optionsavailable in the Set Alarm function.Table 106Set alarm optionsOption DescriptionAL1 Threshold Sets the allowable bit errors per second (from 3 to 9) before alarm level 1 isactivated. Factory default is 10 –6 .AL1 Duration Sets the duration in seconds (from 1 to 3,600 seconds) that alarm level 1 isactivated. Factory default is 10 seconds.AL2 Threshold Sets the allowable bit errors per second (from 3 to 9) before alarm level 2 isactivated. Factory default is 10 -5.AL2 Duration Sets the duration in seconds (from 1 to 3,600 seconds) that alarm level 2 isactivated. Factory default is 10 seconds.Frame SlipThresholdSets the allowable frame slips per time period (from 1 to 255) before alarm level2 is activated. Factory default is 5.Frame SlipDurationSets the duration in hours (from 1 to 24) that the frame slips are counted. Afterthis 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 beslow to return to service automatically even when the carrier is no longerexperiencing any errors. The Clear Alarm command must be enteredmanually to restore service promptly. To avoid this, the duration periodshould normally be set to 10 seconds.Nortel Communication Server 1000Circuit Card ReferenceNN43001-311 01.04 StandardRelease 5.0 23 May 2008Copyright © 2003-2008, Nortel Networks.
