Nortel Networks 553-3001-211 manual Display Configuration D C screen, Yes

			NT5D33 and NT5D34 Lineside E1 Interface cards				Page 289 of 894
Figure 49
Display Configuration (D C) screen
LEI S/N 1103		Software Version		1.01	3/03/95	1:50
Alarms Enabled: YES			Self Clearing Enabled:			YES
Alarm Level	1	threshold value:		E-7	Threshold duration (in
seconds):	10
Alarm Level	2	threshold value:		E-5	Threshold duration (in
seconds):	1				Threshold duration (in hours)
Frame slips	alarm level threshold: 5
2
Current dip	switch S1 settings (S1..S8)				On Off Off On Off Off Off On
Current dip	switch S2 settings (S1..S8)				On Off On Off Off Off On Off

Alarm operation and reporting

The MMI monitors the E1 link according to parameters established through the Set Alarm command for the following conditions:

•Excessive bit error rate

•Frame slip errors

•Out of frame condition

•Loss of signal condition

•Blue alarm (AIS) condition

Descriptions of the excessive bit error rate and frame slip errors conditions are found in “Configuring parameters” on page 278. Bit errors activate either a level 1 or level 2 alarm. The remaining conditions, when detected, always cause the system to activate a level 2 alarm.

An out-of-frame condition will be declared if 3 consecutive frame bits are in error. If this condition occurs, the hardware immediately attempts to reframe. During the reframe time, the E1 link is declared out-of-frame, and silence is sent on all receive timeslots.

A loss of signal condition is declared if a full frame (255 bits) of consecutive zeros has been detected at the receive inputs. If this condition occurs, the E1 link automatically attempts to resynchronize with the far-end. If this condition lasts for more than two seconds, a level 2 alarm is declared, and silence is sent on all receive timeslots. The alarm is cleared if, after two

Circuit Card Description and Installation