3com 3c16476 User Guide

Use the following sequence to power up the Baseline Switch:

1

Check the network connections and cables.

2

Connect the power supply cable to the power socket on the rear 
panel of the unit; refer to 6.

3

Connect the plug to the power supply outlet socket and switch 
on the power supply at the socket. 

When the switch is powered on, the Power LED should stay lit.

At frequent intervals you should visually check the Baseline Switch. 
Regular checks can give you an early warning of a possible failure; 
any problems can then be attended to when there will be least effect 
on users. Check the following:

If you experience any problems operating the Baseline Switch, refer to 
“Problem Solving” on page 4.

The Baseline Switch is supplied with two mounting brackets and four 
screws. These are used for rack mounting the unit. When mounting 
the unit, you should take note of the guidelines given in “Positioning 
the Switch” on page 3.

The Baseline Switch is 1U high and will fit a standard 19-inch rack.

Place the unit the right way up on a hard, flat surface with the 
front facing towards you.

Locate a mounting bracket over the mounting holes on one side 
of the unit.

Insert the two screws supplied in the mounting kit and fully 
tighten with a suitable screwdriver.

Repeat the two previous steps for the other side of the unit.

Insert the unit into the 19-inch rack and secure with suitable 
screws (not provided).

Reconnect all cables.

Refer to the information about LEDs given earlier in this guide to see 
if the problem can be identified and rectified. Here are some common 
problems that can occur:

Link Status LED not lit for a port that has a connection. There is 
a problem with this connection. Check that:

„

The device being connected to is powered on and operating cor-
rectly.

„

The cable is connected at both ends.

„

The cable is not damaged.

„

If the connection is to a workstation, that the workstation’s net-
work interface is installed and configured correctly.

All Link Status LEDs appear to be lit continually. There may be 
broadcast storms on the network. Remove port connections one at a 
time, waiting a few seconds between each port. If the LEDs go off 
after removing a port connection, the device that was connected to 
that port is introducing an excessive amount of broadcast frames to 
the network (some pieces of network equipment operate by sending 
out broadcast frames regularly). Refer to the documentation that 
accompanies the device for information on disabling the broadcast 
operation.

The Fan Alert LED is flashing amber. This indicates that one or 
both of the internal fans are operating in a non-optimal mode. The 
fan(s) may be turning at a lower than expected speed, or may have 
stopped turning. Power the unit off and on again.

If any of these problems persist and the unit still does not operate 
successfully, contact your supplier with the following information 
before returning the unit:

„

Product number and serial number (printed on a label supplied 
with the unit)

„

A brief description of the fault

Cabling

Check that all external cabling connections are 
secure and that no cables are pulled taut.

Cooling fans

Check that the Fan Alert LED is not flashing 
amber.