Nortel Networks 1000 User Manual
Page 291
Man-Machine E1 maintenance interface software
291
Invalid"
message. The digit entered as the threshold value is a number
representing a negative power of 10 as shown in
rate threshold settings" (page 291)
.
Note:
The error-rate threshold for a level 2 alarm must be greater
(a smaller power of 10) than for a level 1 alarm. Remember that the
numbers being represented are negative numbers. Since 3 represents
–3, and 4 represents –4, 4 represents a smaller number than 3 does.
Table 111
E1 bit error rate threshold settings
Alarm threshold bit
errors per second in
power of 10
Threshold to set
alarm
Allowable Duration
Periods
10
-3
2,000/ second
1-21 seconds
10
-4
200/second
1-218 seconds
10
-5
20/second
1-2148 seconds
10
-6
2.0/second
1-3600 seconds
10
-7
2.0/10 seconds
10-3600 seconds
10
-8
2.0/100 seconds
100-3600 seconds
10
-9
2.0/1000 seconds
1000-3600 seconds
The duration value is set in seconds and can be set from 1 to 3,600
seconds (1 hour). This duration value indicates how long the alarm
condition must last before an alarm is declared. Low bit-error rates (10
7
through 10
9
) are restricted to longer durations since it takes more than one
second to detect an alarm condition above10
6
. Higher bit-error rates are
restricted to shorter durations because the MMI error counter fills at 65,000
errors.
If the
Set Clearing (S C)
"Enable Self Clearing" option is set, the alarm
indications (LEDs and external alarm contacts) is automatically cleared
after the specified period, or duration, expires. Otherwise, the alarm
continues until the command
Clear Alarm (C A)
is entered.
When an alarm is cleared, all activity caused by the alarm indications is
cleared:
•
the external alarm hardware is deactivated (the contact normally open
is reopened)
•
the LED goes out
•
an entry is made in the alarm log of the date and time the alarm was
cleared
•
carrier-fail line supervision ceases (for alarm level 2 only)
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
02.06
Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.