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Maintaining DNT2Mi
DN01145897 © Nokia Corporation 51 (128)
Issue 2-0 en Nokia Proprietary and Confidential
7.3 Testing
DNT2Mi tests can be controlled via the front panel or using Q1 menus.
Table 13. Alarms
Alarm
source
Q1 message Front panel
message
Description
Port n BER > 1E-6 (1E-3) Bit error rate worse than the set limit in port 1, 2, or 3
Loss of incoming
signal
No incoming
signal
DTE off or not connected to the DTE interface adapter
of port 1, 2, or 3
Blocked from use Timeslot allocation mismatch. The number of timeslots
allocated to the port does not match with the speed
used in the line.
Test mode CT140 ON DTE is driving circuit 140 (RL) active in port 1, 2, or 3
CT141 ON DTE is driving circuit 141 (LL) active in port 1, 2, or 3
Remote test Remotely controlled digital loop in port 1, 2, or 3
– No adapter The DTE interface adapter not in place in port 1, 2, or 3
AIS 2M AIS G.704 AIS message in port 1, 2, or 3
Loss of frame
alignment
Framing lost G.704 framing lost in port 1, 2, or 3
CRC multiframe
alignment lost
CRC MFA lost G.704 multiframe alignment lost in port 1, 2, or 3
End to end frame
loss
V.110 frame lost V.110 framing lost in port 2 or 3
Far-end alarm Bit 3 (A-bit) of the frame not containing the frame
alignment signal
Line Loss of frame
alignment
Framing lost Line frame synchronisation lost (G.704)
BER > 1E-6 (1E-3) Bit error rate worse than the set limit
No incoming line
signal
No line signal Line failure or remote equipment is faulty or switched
off
Test mode – Line in test mode
Equipment Synch. clock fault Failure in synchronisation source, for example line
signal missing when the line timing mode has been
selected.