3Com 3C16410 Manual do utilizador - Página 3

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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:

Check the network connections and cables.

Connect the power supply cable to the appropriate power socket on

the rear panel of the unit; refer to 6.

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".