User`s guide

Troubleshooting the MultiSwitch 300 4-1
Chapter 4
Troubleshooting the MultiSwitch 300
Procedure for Troubleshooting
If there are any operating problems with the MultiSwitch 300, follow the
troubleshooting steps below (in order). If you find that the switch is still not
functioning correctly, please contact your DIGITAL Service Representative.
1)
Ensure that the unit is plugged into a grounded, functioning ac outlet providing
between 90 Vac and 264 Vac at 50/60 Hz. Check the power fuse and replace it if
blown.
CAUTION
For continued protection against fire, replace the power fuse with one that is the
same type and rating.
2)
Review all link LEDs to ensure that those ports you believe should be functioning
are properly attached to a cable.
3)
Verify that your cables are wired correctly; for example, use a UTP crossover
cable to connect another MDI-X device (such as a hub or switch) directly to a port.
Use a straight cable to directly connect a workstation. Refer to Figure 3-2 for the
proper connector pinouts.
4)
Ensure that you are using Category 5 cabling if you are running at 100 Mb/s.
5)
Review all link LEDs to ensure that those ports you believe should be functioning
are properly configured, and not disabled or partitioned. If the suspect ports are
disabled or do not seem configured properly, reconfigure the port through the
Administrative Interface or your SNMP managment software.
6)
Review all full-duplex LEDs to ensure that those ports you believe should be
functioning are in the correct mode of operation.
7)
If the flow control LED shows excessive activity, refer to Chapter 2 for a
discussion of how to best configure your network for operation with a switch.