3Com 3C16610 - Superstack II Dual Speed HUB 500 User Manual - Page 2

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Network Connections

All ports on the Dual Speed Hub 500 are half duplex, autosensing

10Mbps and 100Mbps. The ports sense the speed of the cables and

devices that are attached to them and operate at the speed required.

For a stack of Dual Speed Hub 500 units, any path through the

stack counts as going through two logical repeaters.

Ethernet Network Configuration Rules

To remain within IEEE 802.3 10Mbps Ethernet rules, the maximum length

of cable between the Dual Speed Hub 500 and an attached device must

not exceed 100m (328ft). If you are connecting multiple repeaters

together in series, ensure that there are no more than four 10Mbps

repeaters between any two devices on your network (as shown below).

Fast Ethernet Network Configuration Rules

To remain within IEEE 802.3 100Mbps Fast Ethernet rules, the maximum

length of cable between the Dual Speed Hub 500 and an attached

device must not exceed 100m (328ft). If you are connecting multiple

repeaters together in series, ensure that there are no more than two

100Mbps repeaters between any two devices on your network, and that

the total cable distance between the two devices does not exceed

205m (672.4ft) (as shown belo w) .

OW TO

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

Front Panel

12 or 24 RJ45 10/100 Ports

You can use these ports to connect 10BASE-T or 100BASE-TX devices

(workstations and other equipment) to the Dual Speed Hub 500. As the

ports are autosensing, the speed of the ports is determined

automatically when you connect your equipment.

WARNING: RJ45 ports. These are shielded RJ45 data sockets.

They cannot be used as telephone sockets. Only connect RJ45

data connectors to these sockets.

AVERTISSEMENT: Les ports RJ45. Ceux-ci sont les prises de

courant de données RJ45 protégées. Ils ne peuvent pas être

utilisés comme prises de courant téléphoniques. Brancher

seulement les connecteurs RJ45 de données à ces prises de

courant.

WARNUNG: RJ45 Ports . Hierbei handelt es sich um

abgeschmirte RJ45 Datenbuchsen, die nicht als Telefonbuchsen

verwendbar sind. Nur RJ45 Datensteckverbinder an diese

Buchsen anschließen.

SE THE

UAL

100BASE-TX and 100BASE-FX Distance Extender

Modules

These slide-in transceiver modules overcome the usual Fast Ethernet

topology limitations by allowing a virtually unlimited number of Dual

Speed Hub 500 units or stacks to be linked together across cable

distances of up to 100m (328ft) for 100BASE-TX, or 2000m (6600ft) for

100BASE-FX. Information on using the Distance Extender Module is

described in the user guide that accompanies the module. Refer to the

" Products " section in this guide for information on obtaining the module.

SNMP and RMON Management Module

A user-installable Dual Speed Hub 500 Management Module can be

fitted in one of the transceiver module slots, providing management

where needed. A single module manages the entire stack and provides

full SNMP and RMON support.

Management allows you to configure the way the Dual Speed Hub 500

operates and monitor the way your network works. You can manage the

unit or stack locally or remotely using the easy-to-use web interface or

Command Line Interface that are supplied. Alternatively, you may want to

use an SNMP network management application (for example 3Com's

powerful Transcend® Enterprise Manager for Windows®) or RMON

(remote monitoring) application.

The Management Module provides a number of other advanced features

including the ability to set Resilient Links and network security. It also

provides the 'Smart Autosensing 10/100' feature*, an enhancement of

the standard autosensing. With Smart Autosensing, each port not only

recognises the speed, but also the quality of the cable attached and

adjusts its speed for maximum reliable transmission.

Information on using the Management Module to manage the Dual

Speed Hub 500 is described in the user guide that accompanies the

Management Module. Refer to the " Products " section in this guide for

information on obtaining the Management Module.

PEED

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

Dual Speed Hub 500 and the other end to the appropriate RJ45 port on

the device. Either shielded or unshielded data cables with shielded or

unshielded jacks can be connected to these data sockets.

The equipment that is connected to the Dual Speed Hub 500

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

as auto-negotiate or half duplex.

10BASE-T

To connect 10BASE-T equipment, use 10BASE-T Category 3, 4 or 5

unshielded or shielded (screened) 100 Ohm TP cable.

Category 5 cable should be used with this product in structured

wiring environments. This will ensure correct operation of all

ports at 10Mbps or 100Mbps.

100BASE-TX

To connect 100BASE-TX equipment, use 100BASE-TX Category 5

unshielded or shielded (screened) 100 Ohm TP cable.

(*available mid-1998)

500