Nortel Circuit Card Installation Manual page 301

Figure 52
Display Configuration (D C) screen
LEI S/N 1103
Alarms Enabled:
Alarm Level 1 threshold value:
seconds): 10
Alarm Level 2 threshold value:
seconds): 1
Frame slips alarm level threshold:
2
Current dip switch S1 settings (S1..S8)
Current dip switch S2 settings (S1..S8)
Alarm operation and reporting
NT5D33 and NT5D34 Lineside E1 Interface cards
Software Version 1.01
YES Self Clearing Enabled:
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 290. 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
3/03/95
YES
E-7 Threshold duration (in
E-5 Threshold duration (in
5 Threshold duration (in hours)
On Off Off On Off Off Off On
On Off On Off Off Off On Off
Circuit Card
1:50
Description and Installation
Page 301 of 906