Table 5–3 (Cont.) Troubleshooting a DECrepeater 90FA Standalone Unit
If...
Then...
Do this...
If the port 0 status LED does not
light and/or remain on
Replace the repeater.
If the port 0 status LED does
remain on, the port may be
segmented when connected to
the network.
Terminate port 0 with a T-
connector and two 50-ohm
terminators. Reconnect a
front panel fiber segment
carrying network activity.
The repeater activity LED
will light.
If port 0 status LED does not
remain on
Replace the repeater.
If the port 0 status LED does
remain on
Remove the T-connector
and the terminators, and
reconnect the ThinWire
segment.
If the port 0 status LED turns
off, either the ThinWire cable is
open, shorted, not terminated
properly, or the external
equipment is transmitting
incorrect data.
Ensure the operation
of external equipment
and cable, or replace the
it with a known good
segment carrying valid
traffic.
A fiber-link LED is off.
Ensure the cable to the receive
channel of the port in question
is good, and that the external
equipment is transmitting the
idle signal.
Reconnect the same cables
and external device to
another repeater port.
If the fiber-link LED for the
new port comes on, the fiber-link
LED of the original port is faulty.
Replace the repeater.
Port 1 status LED is off.
The fiber port may be
segmented, or the LED may
have failed.
Ensure that network
activity is present (a
segmented port will
require data to return
to normal status). The
repeater activity LED
should be on.
(continued on next page)
5–4 Troubleshooting
