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Chapter 13: Troubleshooting
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
Is the indicator on the power supply lit?
Whether main power lamps of
communication modules are lit?
Power source
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)?
Check and reconnect
the power cable. Check
the voltage.
Are the power lamps on the hubs lit?
Are power cables from the AUI properly
connected to the equipment?
Unable to
communicate
Connection
between the
communication cable and
the
transceiver
Connection
between the
transceiver
cable and
transceiver
13
Connection
between the
transceiver
cable and
equipment
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
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 156
Are the transceiver LEDs lit normally?
Check and reconnect
the power cable and
check the voltage
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 Reset according to
etc.) are set properly.
section 15-6
13-2