Paradyne 8540 User Manual page 129

8000-A2-GB20-20
Failure Type Action
Error Rate If the Error Rate Threshold is < 10
Threshold that the loop has degraded. The actual bit rate should still be above
-7
(A trap 10 . This condition may be temporary due to high temperature or
humidity/rain. It may be permanent due to high noise from
message sent if
the Block Error additional digital circuits installed in the same cable bundle.
Rate averaged
If the Error Rate Threshold is >10
over a period of
that the loop has degraded. The actual bit rate may be below 10
time exceeds
This condition may be temporary or permanent. However, if it
the selected
persists, the loop may have to be reengineered for better
value.)
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
Link Down If the threshold is set low (1–4), and the link is currently down, then
there may be a loop or RTU problem. Check both.
Threshold
(A trap
– Verify that the RTU is powered up, is connected to the loop, and
message sent if
has passed its Selftest.
the number of
– Check the loop for continuity
DSL link down
events in 15
If the threshold is set low (1–4), and the link is currently up, then an
minutes
event had occurred to temporarily knock out the connection. Log
exceeds the
the event and continue normal operation.
selected value.)
If the threshold is set high (> 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
If the threshold is set high (> 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.
November 1997
Diagnostics and Troubleshooting
-4
, then this alarm is a warning
-4
, then this alarm is a warning
-7
.
8-9