Nortel Networks Circuit Card User Manual

 NT5D11 and NT5D14 Lineside T1 Interface cards

of the lineside T1 card. Entering the Display Status (D S) command set will 
cause a screen similar to the following to appear:

The MMI monitors the performance of the T1 link according to several 
performance criteria including errored, bursty, unavailable, loss of frame and 
frame slip seconds. It registers the performance of these criteria by reading 
their status every second and counting their results. These counts are 
accumulated for an hour, and then they are reset to 0. Previous hour count 
results are maintained for each hour for the previous 24 hours. 

Performance counts are maintained for the following:

•

Errored seconds – one or more CRC-6 errors, or one or more out of frame 
errors in a second.

•

Bursty seconds – more than one and less than 320 CRC-6 errors in a 
second.

•

Unavailable seconds – unavailable state starts with 10 consecutive 
severely errored seconds and ends with 10 consecutive severely errored 
seconds (excluding the final 10 non-severely errored seconds). Severely 
errored seconds are defined as more than 320 CRC-6 errors, or one or 
more out of frames in a second.

LTI S/N   Software Version 1.01    3/03/95 1:50 

In alarm state: NO

T1 link at alarm level 0

Port 0 off hook, Port 1 on hook, Port 2 on hook, 
Port 3 on hook,

Port 4 on hook, Port 5 on hook, Port 6 off hook, 
Port 7 off hook,

Port 8 off hook, Port 9 on hook, Port 10 on hook, 
Port 11 on hook,

Port 12 off hook, Port 13 on hook, Port 14 on hook, 
Port 15 on hook,

Port 16 on hook, Port 17 on hook, Port 18 off hook, 
Port 19 off hook,

Port 20 off hook, Port 21 on hook, Port 22 on hook, 
Port 23 on hook