Avaya Nortel Communication Server 1000 Reference page 182

NT5D11 and NT5D14 Lineside T1 Interface cards
If the Set Clearing (S C) "Enable Self Clearing" option is set, the alarm indications (LEDs and
external alarm contacts) clear automatically after the duration period expires. Otherwise, the
alarm continues until the command set Clear Alarm (C A) is entered.
When an alarm is cleared, the following activity caused by the alarm is cleared:
• the external alarm hardware is deactivated (the contact normally open is reopened)
• the LED light turns off
• an entry is made in the alarm log of the date and time when the alarm clears
• carrier fail line supervision ceases (for alarm level 2 only)
If self-clearing alarm indications are disabled, carrier fail line supervision terminates when the
alarm condition ceases, but the alarm contact and faceplate LED remain active until the alarm
is cleared.
Note:
A heavy bit error rate can cause 150 bit errors to occur in less than 100 seconds. This causes
the alarm to be activated sooner.
An alarm is not automatically cleared until the system no longer detects the respective bit error
threshold during the corresponding duration period. For example, if an AL1 threshold of 6
(representing 10–6) and a duration period of 100 seconds is specified, an alarm is activated if
more than 150 bit errors occur in any 100 second period (1.5 seconds X 100 seconds = 150/100
seconds). As soon as the alarm is activated, the bit counter is reset to 0. If the next 100 seconds
pass, and less than 150 bit errors are detected, then the alarm clears after the duration period.
However, if more than 150 bit errors are detected in the next 100 seconds, the alarm 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.
outlines the options available in the Set Alarm function.
Table 81: Set alarm options
Option
AL1 Threshold
AL1 Duration
182 Circuit Card Reference
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.
Comments? infodev@avaya.com
Table 81: Set alarm options
Description
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on page 182
July 2011