Nortel Meridian 1 Option 11C Manual page 92

Page 92 of 126 PRI Maintenance
553-3011-315 Standard 13.00
• BPV = N1•16
• CRC = N1• 4
• FBER = N1• 1
N2 values are not scaled. These parameters may be established in LD 73 on
a per card basis, or they can be left at their default values.
Parameters N1 and N2 provide for the following error rate thresholds reported
to the system:
Severely Errored Second: when the number of occurrences of the error
exceeds the value of N1 in the previous second. This error is reported and
counted (LCNT), but no action is taken by the system.
Unavailable Condition: this is reported when 10 severely errored seconds
are received in 10 consecutive seconds. This is equivalent to an error rate
-3
worse than 10 with the default value. When this condition is reached, the 2.0
Mb PRI is put into an out-of-service condition until the Group I OOS guard
timer expires and the error condition has ceased or improved.
No New Call Condition: when the number of occurrences of the error
exceeds the value of (10 x N2) in the previous minute. This corresponds to an
-3
error rate of 10 to 10
reported, the system will record the error (LCNT) and place the PRI card into
a no new call condition, with all idle channels set to MbSY. The card
automatically returns to normal state when the condition improves after the
Group I NNC guard timer expires.
Maintenance Condition: this condition implements when the number of
occurrences of the error exceeds the value of N2 in the previous minute. This
corresponds to an error rate between 10
values. When this condition is reported, the system will record the error
(LCNT) and place the 2.0 Mb PRI card into a maintenance alarm state. This
state has no effect on call processing but simply alerts you of the line
degradation. The card automatically returns to normal state when the
condition improves after the Group I MAINT guard timer expires.
There is no error report for the error rates below 10
are considered satisfactory.
January 2002
-5
using the default N2 value. When this condition is
-5
and 10
-6
based on the N2 default
-6
(10xN2), as such rates