8. Troubleshooting
8-2 September 2002 9128-A2-GB20-80

Physical Tests

on page 8-26

Line Loopback

Payload Loopback

Repeater Loopback

DTE Loopback

Send Line Loopback

Data Channel Loopbacks on a Frame Relay Link

Send Remote Line Loopback

Send and Monitor Pattern Tests

IP Ping Test

on page 8-35

Lamp Test

on page 8-40
Problem Indicators
The unit provides a number of indicators to alert you to possible problems:
Indicators . . . See . . .
LEDs
Viewing LEDs and Control Leads
and
LED Descriptions
in
Chapter7,
Operation and Maintenance
, as well as the user
interface screen.
Main Menu
Status
Display LEDs and Control LEDs
Health and Status Table7-8, Health and Status Messages, in Chapter7,
Operation and Maintenance
.
Main Menu
Status
System and Test Status
Messages also appear at the bottom of any menu-driven
user interface screen.
Performance statistics
Performance Statistics
in Chapter7,
Operation and
Maintenance
, to help you determine how long a problem
has existed.
Alarm conditions that will
generate an SNMP trap
Alarms
on page8-7.
SNMP traps Appendix B,
SNMP MIBs and Traps, and RMON Alarm
Defaults.
Traps supported include warm-start, authentication-failure,
enterprise-specific (those specific to the unit), link-up, and
link-down.