Avaya Nortel Communication Server 1000 Reference page 228

NT5D33 and NT5D34 Lineside E1 Interface cards
external 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
which is deemed to be of major importance. In this situation, the following happens:
- 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 LEI card enters line-conditioning mode
- a yellow alarm message is sent to the CPE/LTU
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. See
Switch 2 (S2) dip switch settings
When the Set Alarm command is selected, the prompt appears for setting the threshold level
and duration for alarm levels 1 and 2.
The E1 link processes at a rate of approximately 2.0 mb/s. The threshold value indicates the
ratio of the total number of bits that must be detected as being in error per second before the
LEI activates an alarm. It can be set between 3 and 9 and can be different for each alarm level.
Any other value entered causes the MMI to display a "Parameter Invalid" message. The
digit entered as the threshold value is a number representing a negative power of 10 as shown
in Table 97: E1 bit error rate threshold settings
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.
because 3 represents –3, and 4 represents –4, 4 represents a smaller number than 3
does.
Table 97: E1 bit error rate threshold settings
Alarm threshold bit errors
per second in power of 10
228 Circuit Card Reference
on page 210.
Threshold to set alarm
-3
10
-4
10
-5
10
-6
10
-7
10
-8
10 2.0/100 seconds
-9
10 2.0/1000 seconds
Comments? infodev@avaya.com
on page 228.
Allowable Duration Periods
2,000/ second
200/second
20/second
2.0/second
2.0/10 seconds
Table 90: LEI card - E1
1-21 seconds
1-218 seconds
1-2148 seconds
1-3600 seconds
10-3600 seconds
100-3600 seconds
1000-3600 seconds
July 2011