Troubleshooting
Table 5–1 DECserver 90TL Troubleshooting
If...
Then...
Do this...
The self-test fails, and
network LED does not
light.
The ThinWire Ethernet
port is not connected to
a properly terminated
network.
Terminate the network correctly.
A fatal hardware error
has ocurred.
Replace the communications server.
The port activity LEDs
do not respond when
characters are typed on
the console keyboard.
Interface cable may be
disconnected or faulty.
Secure or replace the cable.
The port does not
respond to the console
terminal.
The port may be faulty.
Verify the console on a known good
port.
Port and terminal
parameters may be
set incorrectly.
Correctly set the parameters from
another port as follows:
Set ACCESS to Local, AUTOBAUD
to ENABLED, and SIGNAL
CHECK, SIGNAL CONTROL,
and DSRLOGOUT to DISABLED.
The communications
server power LED does
not light.
The power cord has
disconnected from the
outlet.
Connect the power cord.
The communications
server is not receiving
+5VDC.
Check power supply connection.
Reseat the power supply,
backplane installation
only.
Replace the power supply.
The LED is bad.
Replace the communications server.
The network LED is not
lit.
The network is down.
Determine the network status.
Check network
connectivity.
Run MOP loopback or MOP console
carrier session tests.
The Ethernet connection
may be disconnected.
Reconnect the Ethernet cable.
(continued on next page)
5–2 Troubleshooting
