Frame Slippage Improvement Timers - Nortel Meridian 1 Option 11C Manual

Page 70 of 100 DTI/PRI Maintenance

Frame slippage improvement timers

LD 73 - SRIM and SRMM prompts
Prompt
SRIM
SRMM
553-3011-310 Standard 13.00
Once the frame slip out-of-service threshold has been reached, the DTI/PRI
software will invoke a Slip Rate Improvement mechanism to monitor the
slippage and return the DTI/PRI card to service if some criteria has been met.
The criteria used to determine that the slip rate has improved enough to return
a DTI/PRI card to service is that the maintenance threshold is exceeded less
than M (SRMM defines M) times in N (SRIM defines N).
It is important to realize that this monitoring applies to both tracking and
non-tracking modes. Note that a DTI/PRI card in the Slip Rate Improvement
state is always in non-tracking mode, even if it was in tracking mode before
frame slippage exceeded the out-of-service threshold.
There are two thresholds set in LD 73 as described in Figure 10 on page 71.
Response
(1)-127
1-(2)-127
January 2002
Description
Slip Rate Improvement time in minutes.
After the tracking or non-tracking mode frame
slippage out-of-service threshold is exceeded, the
slip rate is monitored for improvement. If the
non-tracking maintenance threshold exceeds SRMM
or fewer times in the duration of this timer, then the
trunks are returned to service. Otherwise, this timer is
reset and monitoring continues.
Slip Rate exceeded maintenance limit.
Number of times the Slip Rate exceeds the
maintenance limit while waiting for Slip Rate
Improvement during the time window specified at the
SRIM prompt.
While waiting for Slip Rate Improvement one of three
DTA messages is output as shown in Figure 10.