Paradyne 8510 DSL, 8310 MVL manual Minor Alarms 2 Failure Type Action, Link Down

Diagnostics and Troubleshooting

Table 7-3. Minor Alarms (2 of 2)

Failure Type	Action
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 SN problem. Check both.
(A trap	± Verify that the SN is powered up, is connected to the loop, and has
message is
	passed its Selftest.
sent if the
	± Check the loop for continuity
number of
DSL link	H If the threshold is set low (1±4), and the link is currently up, then an
down events	event had occurred to temporarily knock out the connection. Log the
in	event and continue normal operation.
15 minutes	H If the threshold is set high (> 4), and the link is currently down, then
exceeds the
selected	check the Margin statistics over the past hour and day. If the numbers
value.)	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-GB26-00 May 1998 7-7