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To connect the hub to a 10 Mbps or 100 Mbps unit, connect an MDIX
port on the unit to port 16 or 24 on the Hub. Ensure that the MDI switch
on the Hub is in (MDI). If an MDI/MDIX port is used on the other unit,
ensure that the MDI switch for that port is out (MDIX). Alternatively, you
can use "cross-over" TP cable to connect any MDIX port on the Baseline
Dual Speed Hub to any MDIX port on another unit.
3 Status LEDs
The Status LEDs show the state of a port and whether or not the Link
Pulse signal is present on the segment connected to a port:
Green
A 100 Mbps Link Pulse signal is being received and the
100BASE-TX segment attached to the port is functional.
Yellow
A 10 Mbps Link Pulse signal is being received and the 10BASE-T
segment attached to the port is functional.
Flashing
Packets are being received on the port.
Off
The Link Pulse signal is not being received. Either nothing is
connected to the port, or there is a problem:
Check that the attached device is powered on.
Check that the cable is the correct type and is not faulty.
If the LED is off for port 16 or 24, check the setting of the MDI
switch. Refer to 2. Try toggling the MDI switch.
If you have connected different types of unit together, check that
your configuration conforms to the network configuration rules
for 10BASE-T and 100BASE-TX.
If the port is connected to another unit's MDI/MDIX port, check
the other unit's MDI switch position.
If these checks do not identify the cause of a problem, it may be that the
unit or the device connected to the port is faulty. Contact your supplier
for further advice.
4 Collision LEDs
The Collision LEDs indicate activity on the 10 Mbps and 100 Mbps
segments:
Flashing
Collisions are occurring on the segment. A low level of collisions is
yellow
a part of normal Ethernet and Fast Ethernet operation. Excessive
collisions may indicate a network problem.
Off
There is no collision on the segment.
5 Power LED
The Power LED indicates a number of conditions:
Green
The unit is powered on and ready for use.
Off
The unit is powered off.
The power cable may be connected incorrectly or the fuse within
the power cord's plug may be faulty (UK models only).
If the unit appears to be operating and the LED is off, contact
your supplier.

Rear Panel Connections

6 Power Supply

The Baseline Dual Speed Hub automatically adjusts to the supply voltage.
Only use the power cord that is supplied with the Baseline Dual Speed
Hub, or a power cord of the same type and rating.
7 Self-adhesive Pads
The hub is supplied with four standard height, self-adhesive rubber pads.
You do not need to apply the pads if you intend to rack mount
the unit.
If you are placing the units one on top of the other, you must use the
self-adhesive rubber pads supplied. Apply the pads to the underside of
each unit, sticking one in the marked area at each corner. Place the units
on top of each other, ensuring that the pads of the upper unit line up
with the recesses of the lower unit.
Positioning the Baseline Dual Speed Hub
CAUTION: When installing the Baseline Dual Speed Hub in a
stack of different size units, the Baseline Dual Speed Hub must
!
be installed above any larger units. Do not have a free standing
stack of more than six units.
When deciding where to position the Baseline Dual Speed Hub ensure:
It is accessible and cables can be connected easily.
Cabling is away from:
Sources of electrical noise such as radios, transmitters and broad-
band amplifiers.
Power lines and fluorescent lighting fixtures.
Water or moisture cannot enter the case of the unit.
Air flow around the unit and through the vents in the side of the case
is not restricted (3Com recommends that you provide a minimum of
25 mm (1 in.) clearance).
To prolong the operational life of your units:
Never stack units more than six high if free standing, and ensure that
cables are supported so that they do not cause the stack to fall over.
Do not place objects on top of any unit or stack.
Do not obstruct any vents at the sides of the case.
Power Supply
Power problems can be the cause of serious failures and downtime in
your network. Ensure that the power input to your system is clean and
free from sags and surges to avoid unforeseen network outages. 3Com
recommends that you install power conditioning, especially in areas prone
to black outs, power dips and electrical storms.
The unit is intended to be grounded. Ensure it is connected to earth
ground during normal use. Installing proper grounding helps to avoid
damage from lightning and power surges.

Rack Mounting

The Baseline Dual Speed Hub can be mounted in a 19-in. equipment rack.
Refer to the "Mounting Kit Instructions" section in this guide.
Power Up
Use the following sequence to power up the Baseline Dual Speed Hub:
1
Check the network connections and cables.
2
Connect the power supply cable to the appropriate power socket on
the rear panel of the unit; refer to 6.
3
Connect the plug to the power supply outlet socket.
When the Baseline Dual Speed Hub is powered on, the Power LED should
be lit. If it is not, refer to 5, "Power LED".
3