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5. Diagnostics and Troubleshooting
5-8
April 2001 8000-A2-GB26-50
Minor Alarms
Use Table 5-3, Minor Alarms, to determine the appropriate action to take for each
Minor Alarm.
Table 5-3. Minor Alarms
Alarm Action
Config Error
1. Check the Selftest Results display by following the menu selection
sequence:
Diagnostics
→
Selftest
(
D
-
A
)
2. Do another Selftest (Reset) and check results.
– If the results are normal, the problem was transient. Log the results.
– If the results still show configuration corruption, there is a card
problem. The card’s nonvolatile RAM should be erased and the
configuration reentered. Perform a configuration download.
– If the configuration has not been saved, use reset and erase
NVRAM to force the card to the factory default. Enter the basic
default route to the MCC and reconfigure the card manually.
NOTE:
The following minor alarm indicates where thresholds have been exceeded
and is primarily an indication of degraded quality on the DSL loop. It is not necessarily
related to problems with the DSL card. It is not valid for Model 8303/8304 IDSL cards.
Margin
Threshold
(Margin
Low)
(A trap
message is
sent if margin
falls below
selected
value.)
If DSL speed is set to a Fixed Rate, you may choose to lower the
speed in the direction indicated by the threshold alarm (Fixed Up
Speed or Fixed Down Speed) to get a better Margin and improved
error performance.
If DSL speed is set to Rate Adaptive and the Margin Threshold is
greater than 0, this alarm is a warning that the loop has degraded. The
actual bit rate should still be above 10
-7
.
This condition may be
temporary due to high temperature or humidity/rain, or it may be
permanent due to high noise from additional digital circuits installed in
the same cable bundle.
If DSL speed is set to Rate Adaptive and the Margin Threshold is
greater than 0, this alarm is a warning that the loop has seriously
degraded. The actual bit rate may be below 10
-7
.
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.
Wrong SN
For RADSL, SDSL and IDSL cards. The wrong model endpoint is
attached. Change to the correct endpoint model for this Access Node
type (screen
A-F
).