Avaya Nortel Communication Server 1000 Reference page 181

alarm hardware is activated by closing the normally open contact. The RED ALARM LED
on the faceplate lights and an alarm message is created in the alarm log and the MMI
terminal.
• Alarm Level 2 (AL2) consists of activity with an error threshold above the AL2 setting.
This is an unsatisfactory condition. In this situation, the external alarm hardware is
activated by closing the normally open contact. The RED ALARM LED on the faceplate
lights, an alarm message is created in the alarm log and the MMI terminal. The Lineside
T1 card enters line processing mode and a yellow alarm message is sent to the CPE/
CSU. The Line processing sends the CS 1000E, CS 1000M, and Meridian 1either all "on-
hook" or all "off-hook" signals depending on the dip switch setting of the card.
When the Set Alarm command is used, a prompt appears to configure the threshold level and
duration period for alarm levels 1 and 2.
The threshold value indicates the number of bit errors detected per second that is necessary
to activate the alarm. The T1 link processes at a rate of approximately 1.5 mb/s. The threshold
value can be set between 3 and 9 and can be different for each alarm level. Any other value
entered causes the software to display a "Parameter Invalid" message. The threshold number
entered represents the respective power of 10 as shown in
settings on page 181.
Note:
The error rate threshold for a level 2 alarm must be greater (a smaller power of 10) than for
a level 1 alarm.
Table 80: T1 bit error rate threshold settings
Alarm threshold bit errors
per second in power of 10
The duration value is set in seconds and can be set from 1 to 3600 seconds (1 hour). This
duration value indicates how long the alarm lasts. Low bit error rates (10-7 through 10-9) are
restricted to longer durations because it takes more than one second to detect an alarm
condition above 10-6. Higher bit error rates are restricted to shorter durations because the MMI
error counter fills at 65,000 errors.
Circuit Card Reference
Threshold to set alarm
–3
10
10
–4
–5
10
–6
10
–7
10
–8
10
–9
10
Man-Machine T1 maintenance interface software
1500/second
150/second
15/second
1.5/second
1.5/10 seconds
1.5/100 seconds
1.5/1000 seconds
Table 80: T1 bit error rate threshold
Allowable duration periods
1–21 seconds
1–218 seconds
1–2148 seconds
1–3600 seconds
10–3600 seconds
100–3600 seconds
1000–3600 seconds
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