Specifications

Troubleshooting
7-17
2. Press 1 or 2 button depending on which unit (local or remote) you wish to return
to normal mode. The DAP then aborts any tests in progress at the selected DAP,
clears any alarms, and turns off the User LED if it is lit. If the unit is equipped
with an IDBU option, it also resets the Automatic Dial Backup Retries function.
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Isolating Network Problems
When used in conjunction with DAP diagnostic functions, the CMS network
management system's Line Quality Statistics (LQS) displays aid in isolating network
problems as described in Table 7-1. DAP diagnostics provide built-in error rate tests that
can be initiated from the DAP's front panel or the CMS system console. DAP diagnostics
can isolate problems to a circuit leg or unit.
Table 7-1. LQS Troubleshooting Reference Chart
Statistic Change in Value Cause(s) Recommendations
Percentage of time
signal level is up.
Dedicated line transmit levels, receive
levels, and signal quality are not within
their respective predefined thresholds.
Check DAP's Transmit Calibrate level
on units equipped with the Model A or
C Aggregate card. Check for open or
bad connections to local loop. Check if
problem is with signal quality. Check
other LQS parameters to isolate source
of problem.
Percentage of time
DDS circuit is
available for use.
One or more of the following condi-
tions are occurring: receiving Out of
Service codes, receiving Abnormal
Station codes (DDS-SC mode only),
line is not connected to unit, receiving
invalid local loop framing from network
(DDS-SC mode only), receiving
unknown control codes from network,
per-forming a network service loop.
Check other LQS parameters to isolate
source of problem. Check level of
service from carrier.