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
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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

Ta bl e 1 and Tab le 2 list conventions that are used
throughout this guide.
Tab l e 1 Notice Icons
Icon Notice Type Description
Information note
Caution Information that alerts you to potential loss of
Warning Information that alerts you to potential
Tab l e 2 Text Conventions
Convention Description
Screen displays
The words “enter” and “type”
Words in italics Italics are used to:
Information that describes important features or instructions
data or potential damage to an application, system, or device
personal injury
This typeface represents information as it appears on the screen.
When you see the word “enter” in this guide, you must type something, and then press Return or Enter. Do not press Return or Enter when an instruction simply says “type.”
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 cur-
rent 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:
pddtechpubs_comments@3com.com
Please include the following information when con­tacting us:
Document title
Document part number (on the title page)
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.
Page number (if appropriate)
Example:
3Com Baseline Switch 2250 Plus User Guide
Part number: DUA16476B-SAA01
Page 25
1

INTRODUCING THE BASELINE SWITCH

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

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.
Tab l e 3 Priority Levels for Traffic Types
Priority Level Traffic Type
0 Best effort
1Background
2 Standard (spare)
3 Excellent effort (business critical)
4 Controlled load (streaming multimedia)
5 Video (interactive media), less than 100
milliseconds latency and jitter
6 Voice (interactive voice), less than 10 milli-
seconds latency and jitter.
7 Network 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-
Physical Features 9
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 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
Panel” on page 12.
Figure 1 Front and Rear Panels
6
Configuring the Spanning Tree”
Front Panel” on page 9 and “Rear
4
1
5
3
2
(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.
7

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.
8
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.
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.
Tab l e 4 10BASE-T/100BASE-TX Ports
Status Meaning
Green Link established, operating at 100 Mbps
Yellow Link established, operating at 10 Mbps
The 1000BASE-T RJ-45 ports support automatic MDI/MDI-X operation, so you can use straight-through or crossover cables for all network
Physical Features 11
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.
Tab l e 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
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 Green
Yel lo w
Power-on self-test is in progress
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.
(8) Recovery Button
Use the Recovery button on the rear panel to reset the Switch to its factory defaults. For more informa­tion, refer to
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.
Resetting to Factory Defaults” on

Rear Panel

(7) Power Supply
The Switch automatically adjusts to the supply volt­age. Only use the power cord that is supplied with the unit.
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
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
WARNHINWEIS: Sicherheitsinformationen. Bevor Sie Komponenten aus dem Switch entfernen oder dem Switch hinzufuegen oder Instandhaltungsarbe-
of this guide.
(l'Appendice B) de ce guide.
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
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 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
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.
Positioning the Switch” on
Using the
®
3 units,
Rack-Mounting or Free-Standing 15
To rack-mount the Switch:
1 Place the unit the right way up on a hard, flat surface
with the front facing towards you.
2 Locate a mounting bracket over the mounting holes
on one side of the unit.
3 Insert the two screws supplied in the mounting kit
and fully tighten with a suitable screwdriver.
Figure 2 Inserting the Screws

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.
1 Plazieren Sie die Baugruppe aufrecht auf einer harten,
ebenen Fläche mit der Vorderseite zu Ihnen.
2 Ordnen Sie eine der Halterungen über den Löchern
an der Seite der Baugruppe an.
3 Stecken Sie zwei der mitgelieferten Schrauben in die
Löcher und drehen Sie diese mit einem geeigneten Schraubendreher fest.
4 Widerholen Sie letzten beiden Schritte auf der
anderen Seite der Baugruppe.
4 Repeat the two previous steps for the other side of
the unit.
5 Insert the unit into the 19-inch rack and secure with
suitable screws (not provided). Ensure that the venti­lation holes are not obstructed.
6 Reconnect the network cables.
5 Führen Sie die Baugruppe in den 19" (Zoll) Baugrup-
penträger ein und sichern sie die Baugruppe mit geeigneten Schrauben. (Nicht im Lieferumfang enthalten.)
6 Schließen 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.
To power on the Switch:
1 Plug the power cord into the power socket on the
rear panel of the Switch. Refer to on page 12
2 Plug the other end of the power cord into a power
for more information.
(7) Power Supply”
outlet.
When the Switch is powered on, the Power LED lights up. If the Power LED does not light up, refer to
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.
Ta bl e 6
summarizes the possible colors for the Power
LED after POST.
Tab l e 6 Possible Power LED Colors After POST
Color State
Green The unit is powered on and ready for use
(5)
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.
Connecting a Network Device 17
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 assis-
tance.

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
Baseline 10/100 switch
Baseline 10/100 switch
Baseline Switch 2250 Plus
1000 Mbps link
10 or 100 Mbps link
To connect a device to the Switch:
1 Connect one end of the cable to an RJ-45 port on the
Switch.
2 Connect the other end to the appropriate RJ-45 port
on the connecting device.
Endstations on switched 100 Mbps connections
Endstations on switched 100 Mbps connections
Endstations on switched 10 or 100 Mbps connection
1000 Mbps copper or fiber connection to backbone or server/workstation
Server on switched 1000 Mbps connection
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-swappa­ble. 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.
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
page 43
.
Troubleshooting” on
To insert an SFP transceiver:
1 Hold 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

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
Suitable slot
n host Switcho
2 Gently 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
Performing Spot Checks 19
not click when you insert it, remove it, turn it over, and then re-insert it.
3 Remove the plastic protective cover, if fitted.
4 Connect the fiber cable.
5 The 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.
6 Connect the other end of the cable to a device fitted
with an appropriate Gigabit Ethernet connection.
7 Check 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:
1 Disconnect the cable from the transceiver.
2 Move the wire release lever downwards until it is
pointing toward you.
3 Pull the wire release lever toward you to release the
catch mechanism.
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 Ta bl e 7
Tab l e 7 Items to Check
Item Verify That
Cabling All external cabling connections are secure
Cooling fan Where possible, check that the cooling fan
.
and that no cables are pulled taut
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.
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
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:
1 On 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 the CD-ROM, and then double-click
The Welcome screen of Discovery appears.
\Discovery folder on
discovery.exe.
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