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13-2
Chapter 13: Troubleshooting
13
13-2 General network problems and countermeasures
[1] Problems concerning the network and appropriate countermeasures (when
unable to communicate)
Symptom Check points Check details Countermeasure
Unable to
communicate
Power source
Is the indicator on the power supply lit?
Check and reconnect
the power cable. Check
the voltage.
Whether main power lamps of
communication modules are lit?
Is the main power lamp on the AUI power
supply modules lit?
Is the power output by AUI power supply
module within the specified range (12 V)?
Are the power lamps on the hubs lit?
Are power cables from the AUI properly
connected to the equipment?
Connection
between the
communicati-
on cable and
the
transceiver
Are there loose parts in the transceiver
installation area?
Reinstall according to
section 15-6.
Check for abnormalities using transceiver
installation checking devices.
Adjust until they are
normal. If errors occur
continuously, install the
unit in another location.
Are the transceivers properly insulated?
Reinstall according to
section 15-6
Were the transceivers properly installed to
the communication cable at its marker
section?
Reinstall according to
section 15-6
Connection
between the
transceiver
cable and
transceiver
Are there loose parts in the transceiver
installation area?
Reinstall according to
section 15-6
Check for abnormalities using transceiver
installation checking devices.
See the installation
manual of the
checker(s)
Are the transceivers locked properly?
Lock them properly
according to section 15-
6
Are the transceiver LEDs lit normally?
Check and reconnect
the power cable and
check the voltage
Connection
between the
transceiver
cable and
equipment
Are there loose parts in the transceiver
installation area?
Reinstall according to
section 15-6
Are the SD (sending) and RD (receive)
LEDs lit normally?
Check the error detail
according to Chapter 13
Make sure the media select switches (SQE
etc.) are set properly.
Reset according to
section 15-6