Paradyne 8540, 8546 manual Failure Type Action, Error Rate, Link Down

Diagnostics and Troubleshooting

Failure Type	Action
Error Rate	H If the Error Rate Threshold is < 10-4, then this alarm is a warning
Threshold	that the loop has degraded. The actual bit rate should still be above
(A trap	10 -7. This condition may be temporary due to high temperature or
message sent if	humidity/rain. It may be permanent due to high noise from
the Block Error	additional digital circuits installed in the same cable bundle.
Rate averaged	H If the Error Rate Threshold is >10-4, then this alarm is a warning
over a period of
	that the loop has degraded. The actual bit rate may be below 10 -7.
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	H If the threshold is set low (1±4), and the link is currently down, then
Threshold	there may be a loop or RTU problem. Check both.
(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	H 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.)	H 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
	H 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.

8000-A2-GB20-20 November 1997 8-9