3COM 3C16791, 3C16790 User Manual

OfficeConnect® Dual Speed Sw itc h 5, Switch 8

User Guid e (3C16 790, 3C 16791)

3Com Corporation ■ 5400 Bayfront Plaza ■ Santa Clara, California ■ 95052-8145

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UNITED STATES GOVERNMENT LEG END

If you are a United States government agency, then this documentation and the software described here in are provided to you subject to the fol lowing:

All technical data and compu ter software are comm ercial in nature and developed solely at priva te expense. So ftware is delivered as “Com mercial Computer Software” as define d in DFARS 252.227-7014 (June 1995) or as a “commercial item” as define d in FAR 2.101(a) and as such is provided with onl y such rights as are provided in 3Com’s standard commercial license for the Software. Technical data is provided with limited rights only as provided in DFAR

252.227-7015 (Nov 1995 ) or FAR 52.227-14 (June 1987), whichev er is applicable. You agree not to remove or deface any portion of any leg end provided on any licensed program or documentation contained in, or delivered to you in conjunction with , this User Guide.

Unless otherwise indica ted, 3Com registe red trademarks are registered in the United States and may or may not be registered in other count ries.

3Com and OfficeConnect are registered tra demarks of 3Com Cor poration. The 3Com logo is a trademark of 3Com Co rporation

Microsoft, MS-DOS, W indows, and Windows N T are registered trademarks of Microsoft Corporation. N ovell and NetWare are registered trademar ks of Novell, Inc.

All other c om pany and pro duct name s ma y b e tradem ark s of t he r espect ive compan ie s with whi ch the y are asso ciat ed.

The OfficeConne ct Du al S peed S wit ches a re cov ere d b y a lifetime l imit ed warranty, which also includes the power adapter. To qualify for the warranty, you must submit a registratio n card or register on-line at

http://support.3com.com/registration/frontpg.pl

Speed Switches are covered by a free 90-day telephone sup port. The lifetime limited w arranty is no t offered where restricted or prohibited by law. Please e-mail any comm ents about th is document to 3Com at:

pddtechpubs_ comments@3Com.com.

(OfficeConnect Dual Spee d Switch 5, Switch 8 User Guide ), part number (DUA1679-0AAA 01) and if appropriate, the page number.

Please include the docume nt title

. The OfficeConne ct Dual

Introduction 4 Creating your Networ k 4

Dual Speed Switch 4—Front 5 Dual Speed Switch 8 and Dual Speed 16—Front 6 All Units—Rear 7

How the Switch Can Be Used 8

Switching 8 Connecting 10BASE-T and 100BASE-TX Networks 9

Before You Start 9

Unit Connections 9 Workstati on Connections 10 Twisted Pai r ( TP ) C ables 10

Stacking the Units Together 11

The Rubber Feet 11

The Stacking Clip 11 Positioning Your Switch 12 Securing Your Switch 12 Connecting Workstations and Othe r Equi pm ent to Your Switch 13

Connecting OfficeConnect Units to Your Switch 13

Checking Unit Conne cti ons 14

Spot Checks 14

Problem Solving 15

Dimensions and Standards 19

Dimensions and Oper ating Conditions 19 Standards 19

Environm ental Statements 20

End Of Life Statement 20 Regulated Materials Statement 20 Environm ental Statement about the Documentation 20 Environm ental Statement about the Product Packaging 20

Important Safety Information 21 Wichtige Sicherheitshinweise 22 Consignes importantes de sécurité 23 Technical Support 24

Online Technical Services 24 World Wide Web Site 24 3Com Knowledge base We b Servi c e s 24 Support from Your Network Supplier 25 Support from 3Com 25 Returning Products for Repair 27

3Com Corporation Limited War ranty 28 Regulatory Notices 30

Networking Terminology 17

NTRODUCTION

OfficeConnect Switch

10BASE-T

OfficeConnect hub

100BASE-TX

OfficeConnect hub

Welcome to the world of networking with 3Com®. In the modern business environment, communication and sharing information is crucial. Computer networks have proved to be one of the fastest modes of communication but until recently, only large businesses could afford the networking advantage. The OfficeConnect

product range from 3Com

has changed this, bringing networks to the small office. As the power of workstations and business applications

increases, heavier demands are made on the available network bandwidth that if unchecked, can lead to performance problems in a hub-based setup. Installing the OfficeConnect Dual Speed Switch 5 (3C16790) or Switch 8 (3C16791) allows your network to be segmented so that traffic can be contained effectively, reducing the overall load without affecting access to critical resources.

This guide will use the term 'Switch' when referring to the Dual Speed Switch 5 or Switch 8.

The Switch is ideal for use with other OfficeConnect products, as shown in Figure 1. It is compact and attractively d esigned for d esktop use. The Swi tch is part of the OfficeConnect range which neatly stack together with the OfficeConnect Stacking Clip.

Figur e 1

(Circle Shows Units Clipped Together)

Small Network with OfficeConnect Dual Speed Switch

The 3C16790 has five 10/100BASE-TX ports while the 3C16791 has eight 10/100BASE-TX ports. This allows you to set up a network with both 10BASE-T and 100BASE-TX hubs and workstations.

REATING YOUR

Dual Speed Switch 5—Front

ETWORK

Alert LED

If the is off, the unit is

Alert LED

operating correctly. After power on, the Alert LED remains lit (orange) for a short period of time while performing a self test. If it is continuously lit there may be a problem. Refer to the “Problem Solving” section.

Power LED

If the

Power LED

is lit ( ) the

green ,

power supply to the Switch is present.

Port Status and Activity LEDs

If the is off there is nothing connected to

Port Status LED

the port, or the connected device is turned off or there may be a problem with the connectivity (refer to the “Problem Solving” section). If the LED is green the speed of the link to the connected device is at 100 Mbps (100BASE-Tx). If the LED is yellow the speed of the link to the connected device is at 10 Mbps (10BASE-T). The LED will flash to indicate traffic is passing through that port.

Duplex LED’s

If the Duplex LED is lit (yellow), the port is in full duplex mode. If the LED is off, the port is in half duplex mode.

Dual Speed Switch 8 —Front

Alert LED

If the is off, the unit is

Alert LED

Power LED

If the

Power LED

is lit ( ) the

green ,

power supply to the Switch is present.

Port Status and Activity LEDs

If the is off there is nothing connected to

Port Status LED

Duplex LED’s

If the Duplex LED is lit (yellow), the port is in full duplex mode. If the LED is off, the port is in half duplex mode.

Dual Speed Switch 8 —Rear

Power Adapter socket

Only use the power adapter that is supplied with this OfficeConnect Switch. Do not use any other adapter.

WARNING: RJ-45 ports. These are shielded RJ-45 data sockets. They cannot be used as standard traditional telephone sockets, or to connect the unit to a traditional PBX or public telephone network. Only connect RJ45 data connectors, network telephony systems, or network telephones to these sockets.

Either shielded or unshielded data cables with shielded or unshielded jacks can be connected to these data sockets.

10/100BASE-TX ports

Use suitable TP cable with RJ-45 connectors. You can connect the OfficeConnect Switch to any workstation or OfficeConnect hub that has a 10BASE-T, 100BASE-TX or 10/100BASE-TX port. Each port is capable of auto-negotiating for 10 Mbps or 100 Mbps operation. All ports have an automatic MDI / MDIX feature, it means either a 'straight through' or 'crossover' UTP cable can be used to connect to any port. The switch will automatically detect which wiring practice has been followed and will compensate accordingly.

WARNHINWEIS: RJ-45-Anschlüsse Diese Porte sind geschützte Datensteckdosen. Sie dürfen weder wie normale traditionelle Telefonsteckdosen noch für die Verbindung der Einheit mit einem traditionellem privatem oder öffentlichem Telefonnetzwerk gebraucht werden. Nur RJ-45Datenanscluße, Telefonnetzsysteme or Netztelefone an diese Steckdosen anschließen.

Entweder geschützte oder ungeschützte Buchsen dürfen an diese Datensteckdosen angeschlossen werden.

AVERTISSEMENT: Ports RJ-45.

Ceux-ci sont protégés par des prises de données. Ils ne peuvent pas être utilisés comme prises de téléphone conventionnelles standard, ni pour la connection de l’unité à un réseau téléphonique central privé ou public.

How the Switch Can Be Used

OfficeConnect Switch

100BASE-TX

High performance

workstation

10BASE-T

OfficeConnect hub

100BASE-TX

OfficeConnect

hub

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). This can result in a lot of unnecessary traffic that can slow the network down. The Switch solves this problem because it ‘listens’ to the network and automatically learns what workstations can be reached through its ports. It can then selectively pass on any information b y transmi tting th e traffic from th e relevan t port only (instead of all ports like a repeater hub). This operation is called ‘switching’.

The Switch effectively divides up your network, localizing the network traffic and passing on traffic as necessary (as shown in Figure 2). If you have workstations that communicate frequently in the same part of the network, traffic between them is not passed on unnecessarily to the remainder of the network, thereby reducing the load. If you have any high performance workstations that require a lot of bandwidth, connect them directly to the Switch.

whether it should be directed through the normal or high priority channel. This feature can be useful for example during excessive loads when one type of traffic may require priority over another. The Switch is configured to to comply with VLAN priorit y ta gged fram es an d IP TO S / D SCP prio rity encoded frames.

Figur e 2

Information Effectively

The Switch Separates Your Network and Controls the

The Switches have an additional new feature to aid network performance at times of excessive load. It is called Priority Queuing. When a packet is received, the Switch will examine it to see if it has been priority encoded. If it has the Switch will the n read the priority level and de termine

Connecting 10BASE-T and 100B ASE-TX Networks

The 10/100 ports can each be connected to either a 10BASE-T or 100BASE-TX network. If you have both types of network, you can join them together using the Switch allowing all your workstations to communicate. Alternatively, if you us e 10BASE-T and want to improve network performance by introducing 100BASE-TX technology, the Switch protects your existing workstations because it maintains 10BASE-T connections to them.

Before You Start

Your OfficeConnect Dual Speed Switch comes with:

One power adapter for use with the Switch.

■

Four rubber feet.

■

A stacking clip.

■

Unit Conne ctions

To connect OfficeConnect units (such as hubs and other switches) to your Switch, you need:

One suitable TP cable for each unit.

■

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