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13-3
Chapter 13: Troubleshooting
13
[2] Problems concerning the network and appropriate countermeasures (when
communications are unstable)
Symptom Check points Check details Countermeasures
Unable to
communicate,
or unstable
communication
Communication
route
Make sure the external conductive
shields of all the coaxial cables are
connected to ground at one point
Ground properly, according
to section 15-6.
Are the shield wires of the AUI
cables properly connected to
ground?
Ground according to the
manufacturer's instruction
manuals
Does each station respond properly
to a Ping command?
Check the power and
cables of any station that
doesn't respond properly.
Is the collision lamp lit frequently?
Check the contacts in
cables and connectors.
Check for abnormalities
using an analyzer.
Are repeaters used in less than 4
layers
Review the configuration
according to section 15-6.
Is each segment within the
maximum length?
Are termination resistors installed at
both ends?
Is the number of devices connected
in each segment within the specified
range?
Are 3 or fewer segments used to
connect the equipment?
Is power to the repeaters turned on?
Check the power supply
and power cable, as well
as the voltage.
Participating
stations
equipment
settings
Are the IP addresses for the network
set properly?
Check the IP addresses
and support tools using an
analyzer.
Are the station numbers of the
equipment set properly?
Check the IP addresses
and support tools using an
analyzer.
Are the equipment parameters set
properly?
Check the equipment
parameters using support
tools.
Are the CD (carrier detection)
indicators lit consecutively or
intermittently?
Check the communication
cables, and the AUI power
supply.
Are the SD (send) indicators lit
consecutively or intermittently?
Re-check the equipment
settings.
Are the LK (link) indicators lit
consecutively?
Re-check the equipment
parameter settings