3Com 12 PORT UNMANAGED ETH/HUB TRANSCEIVER Manuale d'uso

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SuperStack

(3C16441A) User Guide

DUA1644-0AAA03

NTRODUCTION

The SuperStack

3 Baseline Hub is a flexible unmanaged Ethernet

repeater which is very easy to use. It can be used in a variety of ways,

from building a small network to expanding a larger, more established

network.

The SuperStack 3 Baseline Hub 12-port TP (3C16440A) has 12 dedicated

shielded twisted pair (TP) ports on the front panel. The SuperStack 3

Baseline Hub 24-port TP (3C16441A) has 24 dedicated shielded twisted

pair (TP) ports on the front panel. The rear panel also has a slot for a

3Com Transceiver Module; if fitted, the Module will operate in addition to

the TP ports. A range of different media Transceiver Modules is available

from 3Com. Contact your supplier for details.

The Baseline Hub comes with:

One power cord for use with the Baseline Hub

Four standard height and two reduced height self-adhesive rubber

pads

One rack mounting kit

A card with details of online registration

The Baseline Hub is suitable for office use where it can be free standing or

rack-mounted (in a wiring closet or equipment room). The hub can be

powered either from the AC mains supply, or through an optional 3Com

SuperStack Advanced Redundant Power System (3C16071/A/B). Contact

your supplier for details.

3 Baseline Hub 12-Port TP (3C16440A) and 24-Port TP

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Network Connections

The Baseline Hub can be used stand-alone or linked with other hubs.

Because each Baseline Hub is a single IEEE 802.3 Ethernet repeater hub,

there can be a maximum of four Baseline Hubs between any two pieces

of Data Terminal Equipment (DTE) (workstations or other equipment) on

the same network.

The Baseline Hub is ready to use. You can connect the Hub to any DTE

fitted with a 10BASE-T network adapter or a 10BASE-T transceiver.

Connect one end of the twisted pair cable to the RJ45 port on the unit

and the other end to the RJ45 port on your network adapter or

transceiver. You can attach up to 12 or 24 twisted pair segments to the

front of the unit.

The Baseline Hub can use both shielded 150 Ohm, and unshielded or

shielded 100 Ohm twisted pair cables. To remain within 802.3 10BASE-T

rules, the maximum length of cable between the unit and any DTE should

not be greater than 100m (328ft). Consult your supplier's technical

support department if you need to use twisted pair cables over greater

distances.

You can fit one of the 3Com Transceiver Modules into the slot on the rear

panel to provide an additional, 13th or 25th port.

You can connect the Baseline Hub to any other 10BASE-T hub or unit

using port 12 or 24, to form an inter-repeater link. You must switch port

12 or 24 to MDI to bypass the internal cross-over normally implemented

by 10BASE-T unit ports. Refer to "MDI Switch" for information on con-

necting hubs and switching port 12 or 24 between MDI and MDIX.