7-1

7112-A2-GB20-20 March 1998
Testing 7

Detecting Problems

The DSU/CSU can detect and report problem conditions and perform diagnostic
tests. The DSU offers a number of indicators to alert you to possible problems:
LEDs – Refer to
DSU/CSU LEDs
in Chapter 6,
Monitoring the DSU/CSU
.
SNMP Traps – For information on traps, refer to
Configuring SNMP Traps
in
Chapter 8,
Messages and Troubleshooting
.
Health and status messages and network performance statistics. Refer to
Chapter 6,
Monitoring the DSU/CSU
.
Alarm Condition Indications.
The following table shows the available indicators of alarm conditions on the
network interface and the User Data port.
Alarm Condition SNMP
Trap
ATI
Status
Screen Specific
LED
Loss of Signal (LOS) Y1Y Y
Out of Frame (OOF) Y1Y Y
Alarm Indication Signal (AIS) Y1Y N
Excessive Error Rate (EER) Y1Y N
Yellow Y1Y Y
FDL Link Down Y1Y N
User Data Port Down Y1Y Y
1Link Up/Link Down Trap