3COM 2250 User Manual

Baseline Switch 2250 Plus

(3C16476BS) User Guide

http://www.3com.com/

Part No. DUA16476B-SAA02

Published April 2005

3Com Corporation • 350 Campus Drive • Marlborough • MA USA 01752-3064

Copyright © 2004, 2005, 3Com Corporation. All rights reserved. No part of this documentation may be reproduced in any form or by any means or used to make any derivative work (such as translation, transformation, or adaptation) without written permission from 3Com Corporation.

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CONTENTS

ABOUT THIS GUIDE

	Conventions	5
	Related Documentation			6
	Documentation Comments				6
1
	INTRODUCING THE BASELINE SWITCH
	Overview of the Baseline Switch 2250 Plus						7
	Features and Capabilities				7
	Autosensing of MDI/MDIX Connections						7
	Autonegotiating 10/100 Mbps Ports						7
	SFP Ports	8
	Traffic Prioritization			8
	Forwarding of BPDU Packets					8
	Physical Features		9
	Front Panel		9
	Rear Panel	12
	Package Contents		12
2
	INSTALLING THE SWITCH
	Before You Begin		13
	Positioning the Switch			13
	Aufstellen des Switch			14
	Rack-Mounting or Free-Standing					14
	Using the Mounting Kit				14
	Montagesatz Anweisungen					15
	Placing Units On Top of Each Other 15

Supplying Power to the Switch	16
Checking for Correct Operation 16
Connecting a Network Device	17
Using SFP Transceivers 18

Approved SFP Transceivers	18
Inserting an SFP Transceiver	18
Removing an SFP Transceiver	19

	Performing Spot Checks		19
3
	CONNECTING TO THE WEB INTERFACE
	Requirements for Accessing the Web Interface					21
	Running the Discovery Application				21
	Logging On to the Web Interface				22
	Navigating the Web Interface			23
	Menu	23
	Buttons	24
	Port Status 24
	Accessing the Interface Without Using Discovery					24
	DHCP Assigned IP Address			25
	Manually Assigned (Static) IP Address 25
4
	CONFIGURING THE SWITCH
	Configuration Overview		27
	Viewing Summary Information			27
	Changing the Admin Password			28
	Modifying the IP Address Settings				29
	Automatic IP Configuration			29

	Setting the IP Address			30
	Configuring Port Settings			31
	Basic Port Configuration				31
	Advanced Port Configuration					32
	Default Port Settings			32
	Configuring VLANs		32
	Creating a VLAN		33
	Deleting VLANs		33
	Modifying VLANs		34
	Defining VLAN Membership					34
	Sample VLAN Configurations					34
	Configuring Trunking		36
	Guidelines for Creating Trunks					36
	Creating, Modifying, and Deleting Trunks 37
	Defining Trunk Membership					37
	Viewing Trunk Information				37
	Monitoring Traffic	38
	Using the System Tools 39
	Restarting the Switch			39
	Resetting and Backing Up/Restoring Configuration 39
	Upgrading the System Software 40
	Configuring the Spanning Tree					41
	802.1p Prioritization			41
5
	TROUBLESHOOTING
	Resetting to Factory Defaults				43
	Forgotten Password		43
	Forgotten Static IP Address			44
	Solving LED Issues	44
	If the Problem Persists		45

A	OBTAINING SUPPORT FOR YOUR PRODUCT
	Register Your Product		47
	Purchase Value-Added Services			47
	Troubleshoot Online		47
	Access Software Downloads			47
	Telephone Technical Support and Repair 48
	Contact Us 48
B
	SAFETY INFORMATION
	Important Safety Information			51
	France and Peru Only 51
	Power Cord Set		52
	Consignes Importantes de Sécurité				52
	France et Pérou Uniquement				53
	Cordon électrique		53
	Wichtige Sicherheitshinweise Informationen 54
	Stromkabel	54
C
	TECHNICAL INFORMATION
	Related Standards	57

Environmental 57

Physical 57

Electrical 57

GLOSSARY

INDEX

REGULATORY NOTICES

ABOUT THIS GUIDE

This guide is intended for use by network administators who are responsible for installing and setting up network equipment. Consequently, it assumes a basic working knowledge of LANs (local area networks).

Diese Anleitung ist für die Benutzung durch Netzwerkadministratoren vorgesehen, die für die Installation und das einstellen von Netzwerkkomponenten verantwortlich sind; sie setzt Erfahrung bei.

If release notes are shipped with your product and the information there differs from the information in this guide, follow the instructions in the release notes.

Most user guides and release notes are available in Adobe Acrobat Reader Portable Document Format (PDF) on the 3Com World Wide Web site:

http://www.3com.com

Conventions

Table 1 and Table 2 list conventions that are used throughout this guide.

Table 1	Notice Icons
Icon	Notice Type	Description
	Information	Information that describes important features
	note	or instructions
	Caution	Information that alerts you to potential loss of
		data or potential damage to an application,
		system, or device
	Warning	Information that alerts you to potential
		personal injury

Table 2 Text Conventions

Convention	Description
Screen displays	This typeface represents information as it
	appears on the screen.
The words “enter”	When you see the word “enter” in this guide,
and “type”	you must type something, and then press
	Return or Enter. Do not press Return or Enter
	when an instruction simply says “type.”
Words in italics	Italics are used to:
	■	Emphasize a point.
	■	Denote a new term at the place where it is
		defined in the text.
	■	Identify menu names, menu commands, and
		software button names. Examples:

From the Help menu, select Contents.

Click OK.

6 ABOUT THIS GUIDE

Related Documentation

In addition to this guide, each 3Com Baseline Switch 2250 Plus documentation set includes the following:

■Online Help – Accessible from the Web interface, provides information that helps you perform tasks using the Web interface.

■Release Notes – Provide information about the current software release, including new features, modifications, and known problems.

Documentation Comments

Your suggestions are very important to us. They will help make our documentation more useful to you. Please e-mail comments about this document to 3Com at:

[e-mail]

Please include the following information when contacting us:

■Document title

■Document part number (on the title page)

■Page number (if appropriate)

Example:

■3Com Baseline Switch 2250 Plus User Guide

■Part number: DUA16476B-SAA01

■Page 25

Please note that we can only respond to comments and questions about 3Com product documentation at this e-mail address. Questions related to technical support or sales should be directed in the first instance to your network supplier.

1	INTRODUCING THE BASELINE SWITCH

This chapter provides an overview of the features and capabilities of the 3Com® Baseline Switch 2250 Plus. It also identifies the contents of the Switch package and helps you get to know the physical features of the device.

Overview of the Baseline Switch 2250 Plus

The 3Com® Baseline Switch 2250 Plus is a versatile, easy-to-use unmanaged switch. It is ideal for users who want the high-speed performance of 10/100 switching with the added functionality of Gigabit links but do not need sophisticated management capabilities.

The Switch is shipped ready for use. No configuration is necessary, unless you want to configure advanced features such as VLAN support and link aggregation.

Features and Capabilities

The Switch has 48 shielded RJ-45, 10/100 Mbps auto-negotiating ports and two 10/100/1000BASE-T ports that operate in conjunction with two Small Form Factor Pluggable (SFP) transceiver slots on the front panel. Use these SFP transceiver slots for easy, flexible connection to fiber-based Gigabit media.

While there are four physical Gigabit ports, only a maximum of two can be operational at any given time.

Autosensing of MDI/MDIX Connections

All ports on the Switch can autosense both medium dependent interface (MDI) and medium dependent interface crossover (MDIX) connections. This allows you to connect network devices to each port using either a normal straight-through TP (twisted pair) cable or a ‘crossover’ TP cable.

Any port can therefore be used to connect to another switch port, server, or workstation without additional configuration.

Autonegotiating 10/100 Mbps Ports

Each 10/100 Mbps port automatically determines the speed and duplex mode of the connected equipment and provides a suitable switched connection. The 1000BASE-T ports also support automatic 10/100/1000 Mbps speed detection.

The 10/100 Mbps connections on these 1000BASE-T ports operate in full-duplex mode.

8 CHAPTER 1: INTRODUCING THE BASELINE SWITCH

SFP Ports

The two SFP ports support fiber Gigabit Ethernet short-wave (SX) and long-wave (LX) SFP transceivers in any combination. This offers you the flexibility of using SFP transceivers to provide connectivity between the Switch and a 1000 Mbps core network. When an SFP port is in operation, the corresponding 10/100/1000BASE-T port is disabled.

Traffic Prioritization

The Switch offers priority queuing, which means all packets that are received are examined to see if they have been priority encoded. If a packet has been priority encoded, then the Switch will read the priority level and determine whether the packet should be directed through the normal or high priority channel. This feature is useful during excessive loads when one type of traffic may require priority over another. The Switch is configured to comply with 802.1p, VLAN tagged frames.

Traffic prioritization ensures that high priority data is forwarded through the Switch without being delayed by lower priority data. It differentiates traffic into classes and prioritizes those classes automatically. Traffic prioritization uses the multiple traffic queues that are present in the hardware of the Switch to ensure that high priority traffic is forwarded on a different queue from lower priority traffic, and is given preference over that traffic. This ensures that time-sensitive traffic gets the highest level of service. The 802.1D standard specifies eight distinct levels of priority (0 to 7), each of which relates to a particular

type of traffic. The priority levels and their traffic types are shown in the following table.

Table 3 Priority Levels for Traffic Types

Priority Level

Traffic Type

0Best effort

1Background

2Standard (spare)

3Excellent effort (business critical)

4Controlled load (streaming multimedia)

5Video (interactive media), less than 100 milliseconds latency and jitter

6Voice (interactive voice), less than 10 milliseconds latency and jitter.

7Network control reserved traffic

Forwarding of BPDU Packets

Within an extended local area network that implements a spanning tree protocol topology, switches communicate with each other using bridge protocol data unit (BPDU) packets.

If your network is implementing a spanning tree topology across multiples switches, you can configure 3Com Baseline Switch 2250 Plus to forward or to block and discard bridge protocol data unit (BPDU) packets to another switch. Switches that support the spanning tree protocol communicate with each other using BPDU packets.

The spanning tree protocol (STP) is a mechanism that prevents looping and broadcast storms. A spanning tree uses the spanning tree algorithm to detect avail-

able communication paths between switches and to determine the best available path and block less optimal paths.

For information on configuring BPDU forwarding and blocking, refer to “Configuring the Spanning Tree” on page 41.

Physical Features

Figure 1 shows the front and rear panels of the Switch. The numbers in this diagram refer to numbered sections in “Front Panel” on page 9 and “Rear Panel” on page 12.

Figure 1 Front and Rear Panels

1						4			5

6	2	3
7	8

Front Panel

The front panel of the Switch contains a series of indicator lights (LEDs) that help describe the state of various networking and connection operations.

Physical Features

9

(1) 48 RJ-45 Ports

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 RJ-45 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.

AVERTISSEMENT: Points d’accès 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. Raccorder seulement connecteurs de données RJ-45, systèmes de réseaux de téléphonie ou téléphones de réseaux à ces prises.

Il est possible de raccorder des câbles protégés ou non protégés avec des jacks protégés ou non protégés à ces prises de données.

WARNHINWEIS: RJ-45-Porte. 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-45-Datenanscluße, Telefonnetzsysteme or Netztelefone an diese Steckdosen anschließen.

10 CHAPTER 1: INTRODUCING THE BASELINE SWITCH

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

The Switch has 48 10/100 Mbps autonegotiating ports (ports 1 to 48). Their speed and duplex mode (half-duplex or full-duplex) are automatically determined by the capabilities of the connected device. Each port also supports automatic MDI/MDI-X detection and can be connected to either a 10BASE-T, or a 100BASE-TX device.

CAUTION: The Switch supports full-duplex autonegotiation. If the connected device does not support autonegotiation, the Switch will operate in half-duplex mode (even if the attached device is operating in full-duplex mode).

In such a configuration, you may notice some degradation of network performance. 3Com recommends that you use devices that are capable of autonegotiation (and that you ensure that autonegotiation is enabled, if it is a configurable option). (see “Troubleshooting” on page 43).

(2) 10/100/1000BASE-T/SFP Ports

Ports 49 and 50 are combination Gigabit RJ-45 ports with shared Small Form Factor Pluggable (SFP) transceiver slots. If an SFP transceiver (purchased separately) is installed in a slot and is active, the associated RJ-45 port of the same number is disabled.

The 1000BASE-T RJ-45 ports support automatic MDI/MDI-X operation, so you can use straight-through or crossover cables for all network

connections to workstations or servers, or to other switches or hubs.

The two SFP ports support fiber Gigabit Ethernet short-wave (SX) and long-wave (LX) SFP transceivers in any combination. This offers you the flexibility of using SFP transceivers to provide connectivity between the Switch and remote 1000 Mbps workgroups or to create a high-capacity aggregated link backbone connection.

SFP ports are numbered 49 and 50 on the Switch. When an SFP port is active, it has priority over the 10/100/1000 port of the same number. The corresponding 10/100/1000 port is disabled when an SFP transceiver is plugged in.

(3) Link/Activity LEDs

The following tables describe the LEDs visible on the front of the Switch, and how to read their status according to color.

Table 4 10BASE-T/100BASE-TX Ports

Status Meaning

Green	Link established, operating at 100 Mbps
Yellow	Link established, operating at 10 Mbps

Status	Meaning
Flashing	Packets are being received or transmit-
	ted on the port
Off	Link not established, either nothing is
	connected to the port, or there is a
	problem.
	■	Verify that the attached device is
		powered on
	■	Verify that the cable or fiber is the
		correct type and is not faulty
	■	For fiber connections, ensure that the
		receive (RX) and transmit (TX) cable
		connectors are not swapped

If these checks do not identify the cause of the problem, it may be that the unit or the device connected to the port is faulty. Contact your 3Com network supplier for further advice.

Table 5 10BASE-T/100BASE-TX/1000BASE-T Ports

Status Meaning

Green	Link established, operating at 1000
	Mbps
Yellow	Link established, operating at 10 or 100
	Mbps
Flashing Green	Packets are being received or transmit-
	ted on the port at 1000 Mbps
Flashing Yellow	Packets are being received or transmit-
	ted on the port at 10 or 100 Mbps

Physical Features

11

Status	Meaning
Flashing Yellow to	Port disabled or link loopback error
Green
Off	Link not established, either nothing is
	connected to the port, or there is a
	problem.
	■	Verify that the attached device is
		powered on
	■	Verify that the cable or fiber is the
		correct type and is not faulty
	■	For fiber connections, ensure that the
		receive (RX) and transmit (TX) cable
		connectors are not swapped

If these checks do not identify the cause of the problem, it may be that the unit or the device connected to the port is faulty. Contact your 3Com network supplier for further advice.

(4) Module Active LEDs

The Module Active LEDs show the status of any SFP modules that are installed.

Status	Meaning
Green	Fiber SFP is inserted in the slot
Off	No fiber SFP is inserted in the slot

(5) Power LED

The Power LED shows the power status of the Switch.

Status Meaning

Green	The unit is powered on and ready for use

12 CHAPTER 1: INTRODUCING THE BASELINE SWITCH

Off	The unit is not receiving power:
	■	Verify that the power cord is connected cor-
		rectly
	■	If the unit still does not operate, contact your
		3Com network supplier
Flashing	■	Power-on self-test is in progress
Green
Yellow	■	Power-on self-test or loopback test failed. If
		this occurs, reset the Switch to factory
		defaults. Refer to “Resetting to Factory
		Defaults”

(6) Self-Adhesive Pads

The unit is supplied with four self-adhesive rubber pads.

Do not apply the pads if you intend to rack-mount the unit.

If the unit is to be part of a free-standing stack, apply the pads to each marked corner area on the underside of the unit. Place the unit on top of the lower unit, ensuring that the pads locate with the recesses of the lower unit.

Rear Panel

(7) Power Supply

The Switch automatically adjusts to the supply voltage. Only use the power cord that is supplied with the unit.

(8) Recovery Button

Use the Recovery button on the rear panel to reset the Switch to its factory defaults. For more information, refer to “Resetting to Factory Defaults” on page 43.

Package Contents

The 3Com Baseline Switch 2250 Plus package includes the following items:

■One 3Com Baseline Switch 2250 Plus unit

■One power cord

■Four standard height, self-adhesive rubber pads

■One mounting kit

■One CD-ROM, which contains this User Guide and the 3Com Discovery application

■One warranty flyer

Before installing and using the Switch, verify that your Switch package has all these items. If any of the above items are damaged or missing, contact your 3Com network supplier immediately.

2	INSTALLING THE SWITCH

This chapter contains information that you need to install and set up the Switch. It covers the following topics:

■Positioning the Switch

■Rack-Mounting or Free-Standing

■Supplying Power to the Switch

■Connecting a Network Device

■Connecting a Network Device

■Performing Spot Checks

Before You Begin

WARNING: Safety Information. Before installing or removing any components from the Switch or carrying out any maintenance procedures, read the safety information provided in Appendix B of this guide.

AVERTISSEMENT: Consignes de sécurité. Avant d'installer ou d'enlever tout composant du Switch ou d'entamer une procédure de maintenance, lisez les informations relatives à la sécurité qui se trouvent dans Appendix B (l'Appendice B) de ce guide.

WARNHINWEIS: Sicherheitsinformationen. Bevor Sie Komponenten aus dem Switch entfernen oder dem Switch hinzufuegen oder Instandhaltungsarbe-

iten verrichten, lesen Sie die Sicherheitsanweisungen, die in Appendix B (Anhang B) in diesem Handbuch aufgefuehrt sind.

Positioning the Switch

The Switch is suitable for use in an office environment where it can be free-standing or mounted in a standard 19-inch equipment rack.

Alternatively, the Switch can be rack-mounted in a wiring closet or equipment room. A mounting kit, containing two mounting brackets and four screws, is supplied with the Switch.

When deciding where to position the Switch, ensure that:

■It is accessible and cables can be connected easily.

■Cabling is away from sources of electrical noise. These include lift shafts, microwave ovens, and air conditioning units. Electromagnetic fields can interfere with the signals on copper cabling and introduce errors, therefore slowing down your network.

■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 recom-

14 CHAPTER 2: INSTALLING THE SWITCH

mends that you provide a minimum of 25 mm or 1 in. clearance).

■The air is as free of dust as possible.

■Temperature operating limits are not likely to be exceeded. It is recommended that the unit is installed in a clean, air conditioned environment.

It is always good practice to wear an anti-static wrist strap when installing network equipment, connected to a ground point. If one is not available, try to keep in contact with a grounded rack and avoid touching the unit's ports and connectors, if possible. Static discharge can cause reliability problems in your equipment.

Aufstellen des Switch

Bei der Entscheidung wo Sie den Switch positionieren, stellen Sie sicher das:

■Der Switch zugänglich ist und die Kabel leicht angeschlossen werden können.

■Die Kabel nicht in der nähe von elektrischen Störquellen befinden. Das schließt Aufzugsschächte, Mikrowellen und Klimaanlagen ein. Elektromagnetische Felder können die Signale in den Kupferleitungen stören, und Fehler verursachen, was die Verlangsamung Ihres Netzwerkes zur Folge haben kann.

■Weder Wasser noch Feuchtigkeit in das Gehäuse eindringen kann.

■Die Luftzirkulation um den Switch und durch die Öffnungen des Gehäuses nicht behindert wird.

3Com empfiehlt das Sie 25mm (1 Inch) Zwischenraum sicherstellen.

■Die Luft so frei wie möglich von Staub ist.

■Es unwahrscheinlich ist das die Betriebstemperatur überschritten wird. 3Com empfiehlt das Sie den Switch in einer sauberen, klimatisierten Umgebung installieren.

Rack-Mounting or Free-Standing

The unit can be mounted in a 19-inch equipment rack using the supplied mounting kit, (see “Using the Mounting Kit” on page 14), or it can be free-stand- ing. Do not place objects on top of the unit or stack.

CAUTION: If installing the Switch in a free-standing stack of different size Baseline or SuperStack® 3 units, the smaller units must be installed above the larger ones. Do not have a free-standing stack of more than six units.

Using the Mounting Kit

The Switch is supplied with two mounting brackets and four screws. These are used for rack mounting the unit. When mounting the unit, take note of the guidelines given in “Positioning the Switch” on page 13.

The Switch is 1U (1.75 in.) high and will fit in a standard 19-inch rack.

CAUTION: Before continuing, disconnect all cables from the unit. Remove the self-adhesive pads from the underside of unit, if already fitted.

To rack-mount the Switch:

1Place the unit the right way up on a hard, flat surface with the front facing towards you.

2Locate a mounting bracket over the mounting holes on one side of the unit.

3Insert the two screws supplied in the mounting kit and fully tighten with a suitable screwdriver.

Figure 2 Inserting the Screws

4Repeat the two previous steps for the other side of the unit.

5Insert the unit into the 19-inch rack and secure with suitable screws (not provided). Ensure that the ventilation holes are not obstructed.

6Reconnect the network cables.

Rack-Mounting or Free-Standing

15

Montagesatz Anweisungen

Der Switch wird mit zwei Halterungen und vier Schrauben geliefert. Diese werde für den Einbau in einen Baugruppenträger benutzt. Bei der Montage der Baugruppe beachten Sie die Anweisungen aus “Aufstellen des Switch“.

Der Switch ist eine Baueinheit hoch und passt in einen Standard 19'' (Zoll) Baugruppenträger.

ACHTUNG: Entfernen Sie alle Kabel, bevor Sie fortfahren. Entfernen Sie die selbstklebenden Polster (Füße) von der Unterseite der Baugruppe, falls diese bereits angebracht sind.

1Plazieren Sie die Baugruppe aufrecht auf einer harten, ebenen Fläche mit der Vorderseite zu Ihnen.

2Ordnen Sie eine der Halterungen über den Löchern an der Seite der Baugruppe an.

3Stecken Sie zwei der mitgelieferten Schrauben in die Löcher und drehen Sie diese mit einem geeigneten Schraubendreher fest.

4Widerholen Sie letzten beiden Schritte auf der anderen Seite der Baugruppe.

5Führen Sie die Baugruppe in den 19" (Zoll) Baugruppenträger ein und sichern sie die Baugruppe mit geeigneten Schrauben. (Nicht im Lieferumfang enthalten.)

6Schließen Sie alle Kabel wieder an.

Placing Units On Top of Each Other

If the Switch units are free-standing, up to four units can be placed one on top of the other. If you are

16 CHAPTER 2: INSTALLING THE SWITCH

mixing a variety of Baseline and SuperStack units, the smaller units must be positioned at the top.

If you are placing Switch units one on top of the other, you must use the self-adhesive rubber pads supplied. Apply the pads to the underside of each Switch, sticking one in the marked area at each corner. Place the Switch units on top of each other, ensuring that the pads of the upper unit line up with the recesses of the lower unit.

Supplying Power to the Switch

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.

Before powering on the Switch, verify that network cables and the power cable are securely connected.

CAUTION: The Switch has no ON/OFF switch; the only method of connecting or disconnecting main power is by connecting or disconnecting the power cord.

To power on the Switch:

1Plug the power cord into the power socket on the rear panel of the Switch. Refer to “(7) Power Supply” on page 12 for more information.

2Plug the other end of the power cord into a power outlet.

When the Switch is powered on, the Power LED lights up. If the Power LED does not light up, refer to “(5) Power LED” on page 11 for more information.

Checking for Correct Operation

After you power on the Switch, it automatically performs a power-on self-test (POST). During POST, the Power LED on the front panel of the Switch flashes green.

When POST is complete, the Power LED turns green. If the Power LED turns yellow after POST, it means that POST failed.

Table 6 summarizes the possible colors for the Power LED after POST.

Table 6 Possible Power LED Colors After POST

Color	State
Green	The unit is powered on and ready for use

Color	State
Yellow	Power-on self-test or loopback test failed.
	This can happen if a ports or ports fail
	when the Switch was powered on.
Off	The unit is not receiving power:
	■	Verify that the power cord is connected
		correctly, and then try powering on the
		Switch again
	■	If the Switch still does not operate, con-
		tact your 3Com network supplier

If POST fails, try the following:

■Power off the Switch, and then power it on again. Check the Power LED and see if POST was successfully completed.

■Reset the Switch. See “Resetting to Factory Defaults” on page 43.

CAUTION: Resetting the Switch to its factory defaults erases all your settings. You will need to reconfigure the Switch after you reset it.

If these do not resolve the issue:

■Check the 3Com Knowledgebase for a solution. To visit the 3Com Knowledgebase Web site, start your Web browser, and then enter

http://knowledgebase.3com.com.

■Contact your 3Com network supplier for assistance.

Connecting a Network Device

17

Connecting a Network Device

To connect a network device to the Switch, use Category 5 unshielded or shielded (screened) 100 Ohm TP cables (or Category 3 cables for 10 Mbps connections).

For optimal connections, ensure that the cable length for each connection is not longer than 100 m (328 ft).

Figure 3 Connecting Devices to the Switch

	Endstations on switched
Baseline 10/100 switch	100 Mbps connections

	Endstations	on switched
Baseline 10/100 switch	100 Mbps connections
Baseline Switch 2250 Plus		1000 Mbps copper
		or fiber connection
		to backbone or
		server/workstation
		Endstations
		on switched
1000 Mbps link		10 or 100 Mbps
		connection
10 or 100 Mbps link

Server on switched 1000 Mbps connection

To connect a device to the Switch:

1Connect one end of the cable to an RJ-45 port on the Switch.

2Connect the other end to the appropriate RJ-45 port on the connecting device.

For 1000BASE-T operation, 3Com recommends using Category 5e or 6 cables.

18 CHAPTER 2: INSTALLING THE SWITCH

Using SFP Transceivers

The following sections describe how to insert and remove an SFP transceiver from an SFP slot.

SFP transceivers are hot-insertable and hot-swappa- ble. You can remove them from and insert them into any SFP port without having to power off the Switch.

Approved SFP Transceivers

The following list of approved SFP transceivers is correct at the time of publication:

■3CSFP91 SFP (SX)

■3CSFP92 SFP (LX)

To access the latest list of approved SFP transceivers for the Switch on the 3Com Corporation World Wide Web site, enter this URL into your Internet browser:

http://www.3com.com

3Com recommends using 3Com SFPs on the Switch. If you insert an SFP transceiver that is not supported, the Switch will not recognize it.

Inserting an SFP Transceiver

To be recognized as valid, the SFP transceiver must be one of the following:

■1000BASE-SX SFP transceiver – Use this transceiver to connect the Switch directly to a multimedia fiber-optic cable.

■1000BASE-LX SFP transceiver – Use this transceiver to connect the Switch directly to a single-mode

fiber-optic cable or to multimode fiber using a conditioned launch cable.

If the SFP transceiver is faulty, it will not operate within the Switch. See “Troubleshooting” on page 43.

To insert an SFP transceiver:

1Hold the transceiver so that the fiber connector is toward you and the product label is visible, as shown in Figure 4. Ensure the wire release lever is closed (in the upright position).

Figure 4 Inserting the SFP Transceiver

Product label

Wire release lever

Suitable slot on host Switch

2Gently slide the transceiver into the SFP slot until it clicks into place.

CAUTION: SFP transceivers are keyed and can be properly inserted only one way. If the transceiver does

not click when you insert it, remove it, turn it over, and then re-insert it.

3Remove the plastic protective cover, if fitted.

4Connect the fiber cable.

5The transceiver connects to the network using a duplex LC connector. Attach a male duplex LC connector on the network cable into the duplex LC connector on the transceiver.

6Connect the other end of the cable to a device fitted with an appropriate Gigabit Ethernet connection.

7Check the Module Active LEDs on the front of the Switch to ensure that it is operating correctly.

Removing an SFP Transceiver

Removing an SFP transceiver does not require powering off the Switch.

To remove an SFP transceiver:

1Disconnect the cable from the transceiver.

2Move the wire release lever downwards until it is pointing toward you.

3Pull the wire release lever toward you to release the catch mechanism.

The SFP transceiver should slide out easily.

Performing Spot Checks

At frequent intervals, you should visually check the Switch. Regular checks can give you an early warning

Performing Spot Checks

19

of a possible failure; any problems can then be attended to when there will be least effect on users.

3Com recommends periodically checking the items listed in Table 7.

Table 7 Items to Check

Item	Verify That
Cabling	All external cabling connections are secure
	and that no cables are pulled taut
Cooling fan	Where possible, check that the cooling fan
	is operating by listening to the unit. The
	fan is fitted near to the front right hand
	side of the unit (when viewed from the
	front).

If you experience any problems operating the Switch, refer to “Troubleshooting” starting on page 43.

20 CHAPTER 2: INSTALLING THE SWITCH

3	CONNECTING TO THE WEB INTERFACE

The Switch has a built-in Web interface that you can use to set the admin password, change the IP address that is assigned to the Switch, and configure its advanced settings.

If you only want the Switch to function as a basic layer 2 switch, you do not need to access the Web interface and configure the Switch.

This chapter provides information on how the gain access to the Web interface using the Discovery application. It also introduces the menu items and buttons that are available on the Web interface.

The following topics are covered:

■Requirements for Accessing the Web Interface

■Running the Discovery Application

■Logging On to the Web Interface

■Navigating the Web Interface

Requirements for Accessing the Web Interface

To connect to the Web interface, you need the following:

■The Discovery application, which is included on 3Com Baseline Switch 2250 Plus CD-ROM that is supplied with your Switch

■A computer that is connected to the Switch and that has a Web browser

Running the Discovery Application

The 3Com Baseline Switch 2250 Plus CD-ROM contains, among others, the Discovery application.

To use Discovery to connect to the Web interface, do the following:

1On a computer that is connected to the Switch, insert the CD-ROM into its CD drive.

Discovery should start automatically. If it does not start automatically, go to the \Discovery folder on the CD-ROM, and then double-click discovery.exe.

The Welcome screen of Discovery appears.