3Com 14-PORT Посібник користувача - Сторінка 3

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NTRODUCTION

The SuperStack

II Baseline Switch is a flexible unmanaged switch

that is very easy to use. It can be used to help build a small network

or expand a larger, more established network.

The Baseline Switch has 12 dedicated RJ45 10BASE-T ports on the

front panel and two RJ45 10/100 ports (ports 13 and 14) on the rear

panel (which can both be either 10BASE-T or 100BASE-TX).

The Baseline Switch is suited for office use where it can be free

standing, wall mounted, or rack mounted (in a wiring closet or

equipment room). A mounting kit is supplied.

The unit can be powered either from the AC mains supply, or

through an optional 3Com SuperStack II Advanced Redundant Power

System. Contact your supplier for details.

The Baseline Switch comes with:

One power cord for use with the Baseline Switch

Four standard height and two reduced height self-adhesive

rubber pads

Mounting kit

A Warranty Registration card for you to fill in and return

Switching

When a network of repeater hubs is in operation, any information

that is sent by the workstations is passed around the whole network

(regardless of the destination of the information) which results in a

lot of unnecessary traffic that can slow it down. The Baseline Switch

solves this problem because it 'listens' to the network and

automatically learns what workstations and network equipment can

be reached through its ports. It can then selectively pass on any

information by transmitting the traffic to the relevant port only

(instead of all ports like a repeater hub). This operation is called

switching.

The Baseline Switch effectively segments your network, localizing the

network traffic and passing on traffic as necessary. If you have

workstations that communicate frequently in the same part of the

network, traffic between them is not passed to the remainder of the

network, reducing the load.

Connecting 10BASE-T and 100BASE-TX

The 10/100 ports allow you to connect 100BASE-TX networks or

workstations to the Baseline Switch. This means that if you have

both 10BASE-T and 100BASE-TX networks, you can connect them so

that all your workstations can communicate.

Alternatively, if you have 10BASE-T and want to improve

performance by introducing 100BASE-TX, the Baseline Switch

protects your investment because it maintains 10BASE-T connections

to your original network equipment.

OW TO

Numbered elements in this diagram refer to numbered sections in the text.

SE THE

ASELINE

Network Connections

The Baseline Switch is ready to use, and can be used stand-alone or

linked with other units, for example repeater hubs.

All ports on the Baseline Switch have full duplex auto-negotiation.

Full duplex operation allows information to be transmitted and

received simultaneously and, in effect, doubles the potential

throughput of a link. If the device connected to a port supports

auto-negotiation, the port operates in full duplex mode. Otherwise

the port operates in half duplex mode.

CAUTION: The equipment that is connected to the Baseline

Switch must not be set up to operate in full duplex. Set it

up to operate as auto-negotiate or half duplex.

Connecting 10BASE-T (Ethernet) Equipment

You can connect 10BASE-T units or DTE (workstations or other

equipment) to any ports on the Baseline Switch. To connect your

equipment, use 10BASE-T Category 3, 4 or 5 unshielded 100 Ohm

TP or shielded (screened) 150 Ohm TP cable.

Category 5 cable must be used with this product in

structured wiring environments. This will ensure correct

operation of all ports at 10Mbps or 100Mbps.

Connect one end of the TP (twisted pair) cable to the RJ45 port on

the Baseline Switch and the other end to the appropriate RJ45 port

on the unit or DTE.

To remain within IEEE 802.3 10BASE-T rules, the maximum length of

cable between the Baseline Switch and any DTE should not be

greater than 100m (328ft). If you are connecting DTE to the Baseline

Switch through a series of repeaters, ensure that there are no more

than four repeaters between the Baseline Switch and the DTE.

Connecting 100BASE-TX (Fast Ethernet) Equipment

You can connect 100BASE-TX units or DTE to ports 13 and 14 on

the Baseline Switch. To connect your equipment, use 100BASE-TX

Category 5 unshielded 100 Ohm TP or shielded (screened) 150 Ohm

TP cable.

Connect one end of the TP (twisted pair) cable to the RJ45 port on

the Baseline Switch and the other end to the appropriate RJ45 port

on the unit or DTE.

To remain within IEEE 802.3 100BASE-TX rules, the maximum length

of cable between the Baseline Switch and any DTE should not be

greater than 100m (328ft). If you are connecting DTE to the Baseline

Switch through a series of repeaters, ensure that there are no more

than two repeaters between the Baseline Switch and the DTE, and

that the total cable length does not exceed 205m (672.4ft).

WITCH