Modem User's Guide
Table Of Contents
- Contents
- Warranty, Sales, and Service Information
- About This Guide
- About the Model 7986 Standalone Termination Unit
- Using the Asynchronous Terminal Interface
- Initial Startup and Configuration
- Monitoring the Unit
- Testing
- Messages and Troubleshooting
- Security
- IP Addressing
- Configuration Option Tables
- Standards Compliance for SNMP Traps
- Cables and Pin Assignments
- Technical Specifications
- Glossary
- Index
Messages and Troubleshooting
6-6
7986-A2-GB20-00
September 1998
Table 6-2. Troubleshooting (2 of 2)
Symptom SolutionsPossible Cause
Not receiving data. H The network or data port
cables are not
connected (check front
panel LEDs for more
information).
H No crossover cable
being used on the DSL
network
H Check network and data port
cables.
H Run Loopback tests. Refer to
Chapter 5,
Testing
.
H Use a crossover cable on the DSL
network. Cross PINS 1, 2 to 4, 5.
be g used e S
network.
H A test is being executed
on the unit (check the
TEST LED on the front
panel).
H The far-end device is
off-line.
H Stop the test or wait for the test to
end.
H Make sure the far-end device is
on.
Power-Up Self-Test
fails. Only Alarm
LED is on after
power-up.
The unit has detected an
internal hardware failure.
H Reset the unit and try again.
H Contact your service
representative.