Paradyne 8310 MVLt - Manual (Page 84)

Diagnostics and Troubleshooting
6-6 8000-A2-GB26-10 January 1999
Table 6-3. Minor Alarms (2 of 2)
Alarm Action
Link Down
Threshold
(A trap
message is
sent if the
number of
DSL link
down events
in 15 minutes
exceeds the
selected
value.)
H If the threshold is set low (1–4) and the link is currently down, then
there may be a local loop or Service Node problem. Check both.
– Verify that the Service Node is powered up, is connected to the
local loop, and has passed its self-test.
– Check the loop for continuity.
H If the threshold is set low (1–4) and the link is currently up, then an
event had occurred to temporarily knock out the connection. Log the
event and continue normal operation.
H If the threshold is set high (more than 4) and the link is currently
down, then check the Margin statistics over the past hour and day. If
the numbers are low, there may be a situation where the DSL
modems cannot train. This condition may be temporary or permanent.
However, if it persists, the loop may have to be reengineered for
better performance by performing one of the following:
– Remove bridge taps.
– Change cable gauge on a cable section.
– Run new cable.
– Remove other noise-generating digital circuits from the cable
bundle.
H If the threshold is set high (more than 4) and the link is currently up,
then there may be a loose connection in the loop plant, or the loop is
barely usable. Check the Margin. If the Margin is normal, there may
be a loose connection. If the Margin is low, try reducing the speed of
the DSL port.