Nortel Networks 1000 - Manual (Page 237)

Man-Machine T1 maintenance interface software 237
Display Status
The Display Status (D S) command set displays the current alarm
condition of the T1 link as well as the on-hook or off-hook status of each
of the 24 ports of the Lineside T1 card. Entering the Display Status (D S)
command set causes a screen similar to the following to appear:
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
The MMI monitors the T1 link according to the parameters established
through the Set Alarm command set 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
can be found in
“Configuring parameters” (page 227) . Bit errors may
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 is declared if two out of four frame bits are
in error. If this condition occurs, the hardware immediately attempts to
reframe. During the reframe time, the T1 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 (192 bits) of
consecutive zeros has been detected at the receive inputs. If this condition
occurs, the T1 link automatically attempts to resynchronize with the distant
end. If this condition lasts for more than two seconds, a level 2 alarm is
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.