Nortel NT1R20, Description

Page: 208 / 316

Page 184 of 290 NT5D33 and NTRB34 Line-side E1 Interface Cards
553-3001-105 Standard 5.00 June 1999
Figure 45
Display Status (D S) screen
Performance counters and reporting
The MMI monitors the performance of the E1 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, at which time they are reset to 0. Previous hour
count results are maintained for each of the previous 24 hours.
The LEI counts CRC-4 errors when CRC-4 is enabled and Bipolar Violations
(BPV) when CRC-4 is disabled. The performance criteria for which these
counts are maintained as follows:
— Errored seconds are seconds in which one or more CRC-4 / BPV errors,
or one or more out-of-frame errors in one second.
— Bursty seconds are seconds in which more than one and less than 320
CRC-4 / BPV errors in a second.
— Severely errored seconds are seconds in which more than
320 CRC-4 / BPV errors, or one or more out-of-frames in a second.
— Unavailable seconds are seconds in which unavailable state starts with 10
consecutive severely errored seconds and ends with 10 consecutive
non-severely errored seconds (excluding the final 10 non-severely
errored seconds).
— Loss-of-frame seconds are seconds in which loss-of-frame or
loss-of-signal conditions have existed for three consecutive seconds.
— Frame slip seconds are seconds in which one or more frame slips occur.
LEI S/N Software Version 1.01 3/03/95 1:50
In alarm state: NO
E1 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
Port 21 off hook, Port 22 on hook, Port 23 on hook, Port 24 on hook,
Port 25 on hook, Port 26 on hook, Port 27 off hook, Port 28 off hook,
Port 29 off hook