Vigitron MaxiiNet Vi30018, Operational Manual

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Section 7: Troubleshooting
7.0 Basic
Troubleshooting
Tips
Most problems are caused by the following situations. Check for these
items first when starting your troubleshooting:

Connecting to devices that have a fixed full- duplex
configuration.
The RJ45
ports are configured as “Auto”. That is,
when connecting to attach devices, the switch will operate in one
of two ways to determine the link speed and the communication
mode (half duplex or full duplex):
o
If the connected device is also configured to Auto, the
switch will automatically negotiate both link speed and
communication mode.
o
If the connected device has a fixed configuration, for
example 100Mbps at half or full duplex, the switch will
automatically sense the link speed but will default to a
communication mode of
half -duplex.
Because the Vi30018 behaves I n this way (in
compliance with
the IEEE802.3 standard ), if a device connected to the switch has
a fixed configuration at full duplex, the device will not connect
correctly to the switch. The result will be high error rates and very
inefficient communications between the switch and the device.
Make sure all devices connected to the Vi30018 Switch devices
are configured to auto negotiate or are configured to connect at
half duplex (all hubs are configured this way, for example).

Faulty or loose cables. Look for loose or obviously faulty
connections. If they appear to be OK, make sure the connections
are snug. If that does not correct the problem, try a different
cable.

Non-standard cables. Non-standard and mis-wired cables may
cause network collisions and other network problems, and can
seriously impair network performance. Use a new correctly-wired
cable for pin-outs and correct cable wiring. A category 5 cable
tester is a recommended tool for every 100Base-TX and
1000Base-T network installation.

Improper Network Topologies. It is important to make sure you
have a valid network topology. If you no longer experience the
problems, the new topology is probably at fault. In addition, you
should make sure that your network topology contains
no data
path loops.