
Excalibur Multirate DAP Installation and Operation
7-18
Table 7-1. LQS Troubleshooting Reference Chart (Continued)
Statistic Change in Value Cause(s) Recommendations
Percentage of time
DAP is receiving a
valid signal from the
network.
One or more of the following condi-
tions are occurring: line is not
connected to unit, receiving invalid
local loop framing from network (DDS-
SC mode only), receiving unknown
control codes from network,
Check for open or bad connections to
local loop. Check other LQS parameters
to isolate source of problem.
Number of Out of
Service codes
received.
Receiving Out of Service codes from
network.
Check with carrier for network outages.
Remote unit may be disconnected from
network (DDS or DDSNI point-to-point
networks only). Check remote unit for
power. Check for open or bad
connections to local loop at remote unit.
Check clocking at remote unit.
Number of Abnormal
Station codes
received.
Receiving Abnormal Station codes from
network (DDS-SC mode only).
Check with carrier for network outages.
Remote unit may be disconnected from
network (DDS or DDSNI point-to-point
networks only). Check remote unit for
power. Check for open or bad
connections to local loop at remote unit.
Check clocking at remote unit.
Number of network
framing errors
received.
Receiving network framing errors
(DDS-SC mode only), Errors occurring
in local loop.
Check receive level. If receive level is
OK, have local loop tested by carrier.
Number of unknown
control codes
received.
Receiving unknown control codes or
unknown bipolar violations from the
network.
Have local loop tested by carrier.
Total number of
multiport/multidrop
resynchronizations.
A timing slip or lengthy line disruption
occurred on the DDS circuit.
Some errors normally occur. Look for
repeating peaks in value. Investigate
activities at remote sites during peaks.
Number of seconds
receive line fault
conditions occur.
Dedicated line is not connected to unit.
Open in local loop.
Check for open or bad connections to
local loop.
Number of seconds
active network
service loops occur.
Either latching or non-latching loops
occurred on unit.
If testing is unsolicited or interfering
with network availability, inform Telco.
Komentáře k této Příručce