3Com 3C17204, 3C172203 User Manual

SuperStack® 3

Switch 4400

Getting Started Guide

3C17203

3C17204

http://www.3com.com/

Part No. DUA1720-3AAA02

Published August 2001

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

Copyright © 2001, 3Com Technologies. 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 Technologies.

3Com Technologies reserves the right to revise this documentation and to make changes in content from time to time without obligation on the part of 3Com Technologies to provide notification of such revision or change.

3Com Technologies provides this documentation without warranty, term, or condition of any kind, either implied or expressed, including, but not limited to, the implied warranties, terms or conditions of merchantability, satisfactory quality, and fitness for a particular purpose. 3Com may make improvements or changes in the product(s) and/or the program(s) described in this documentation at any time.

If there is any software on removable media described in this documentation, it is furnished under a license agreement included with the product as a separate document, in the hard copy documentation, or on the removable media in a directory file named LICENSE.TXT or !LICENSE.TXT. If you are unable to locate a copy, please contact 3Com and a copy will be provided to you.

UNITED STATES GOVERNMENT LEGEND

If you are a United States government agency, then this documentation and the software described herein are provided to you subject to the following:

All technical data and computer software are commercial in nature and developed solely at private expense. Software is delivered as “Commercial Computer Software” as defined in DFARS 252.227-7014 (June 1995) or as a “commercial item” as defined in FAR 2.101(a) and as such is provided with only 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), whichever is applicable. You agree not to remove or deface any portion of any legend provided on any licensed program or documentation contained in, or delivered to you in conjunction with, this User Guide.

Unless otherwise indicated, 3Com registered trademarks are registered in the United States and may or may not be registered in other countries.

3Com and SuperStack are registered trademarks of 3Com Corporation. The 3Com logo and CoreBuilder are trademarks of 3Com Corporation.

Intel and Pentium are registered trademarks of Intel Corporation. Microsoft, MS-DOS, Windows, and Windows NT are registered trademarks of Microsoft Corporation. Novell and NetWare are registered trademarks of Novell, Inc. UNIX is a registered trademark in the United States and other countries, licensed exclusively through X/Open Company, Ltd.

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All other company and product names may be trademarks of the respective companies with which they are associated.

ENVIRONMENTAL STATEMENT

It is the policy of 3Com Corporation to be environmentally-friendly in all operations. To uphold our policy, we are committed to:

Establishing environmental performance standards that comply with national legislation and regulations.

Conserving energy, materials and natural resources in all operations.

Reducing the waste generated by all operations. Ensuring that all waste conforms to recognized environmental standards. Maximizing the recyclable and reusable content of all products.

Ensuring that all products can be recycled, reused and disposed of safely.

Ensuring that all products are labelled according to recognized environmental standards.

Improving our environmental record on a continual basis.

End of Life Statement

3Com processes allow for the recovery, reclamation and safe disposal of all end-of-life electronic components.

Regulated Materials Statement

3Com products do not contain any hazardous or ozone-depleting material.

Environmental Statement about the Documentation

The documentation for this product is printed on paper that comes from sustainable, managed forests; it is fully biodegradable and recyclable, and is completely chlorine-free. The varnish is environmentally-friendly, and the inks are vegetable-based with a low heavy-metal content.

CONTENTS

ABOUT THIS GUIDE

Conventions 8

Related Documentation 9

Accessing Online Documentation 9

Product Registration 10

Documentation Comments 10

1INTRODUCING THE SUPERSTACK 3 SWITCH 4400

	About the Switch 4400		12
	Summary of Hardware Features			12
	Summary of Software Features			13
	Switch 4400 — Front View Detail			14
	10BASE-T/ 100BASE-TX Ports			15
	LEDs 15
	Switch 4400 — Rear View Detail			17
	Power Socket	17
	Redundant Power System Socket 17
	Console Port	17
	Expansion Module Slots 17
	Default Settings	18
2 INSTALLING THE SWITCH
	Package Contents	20
	Choosing a Suitable Site		20
	Rack-mounting	21
	Placing Units On Top of Each Other			22
	Stacking Units 22
	The Power-up Sequence		23
	Powering-up the Switch 4400			23

	Checking for Correct Operation of LEDs							23
	Connecting a Redundant Power System							24
	Choosing the Correct Cables				24
3 SETTING UP FOR MANAGEMENT
	Setting Up Overview		28
	IP Configuration	28
	Preparing for Management				30
	Initial Switch Setup	30
	Manual Setup 31
	Connecting to a Front Panel Port					31
	Connecting to the Console Port					33
	Automatic Setup	36
	Using 3Com Network Supervisor					36
	Connecting to the Console Port					36
	Methods of Managing a Switch				39
	Command Line Interface Management							39
	Web Interface Management				40
	SNMP Management		40
	Setting Up Command Line Interface Management 41
	CLI Management via the Console Port							41
	CLI Management over the Network						41
	Setting Up Web Interface Management						42
	Pre-requisites	42
	Web Management Over the Network							42
	Setting Up SNMP Management				43
	Pre-requisites	43
	Default Users and Passwords			44
	Changing Default Passwords				44
4 PROBLEM SOLVING
	Solving Problems Indicated by LEDs					46
	Solving Hardware Problems			47
	Solving Communication Problems				48

A	SAFETY INFORMATION
	Important Safety Information 52
	L’information de Sécurité Importante		53
	Wichtige Sicherheitsinformationen		55
B
	PIN-OUTS
	Null Modem Cable	57
	PC-AT Serial Cable	57
	Modem Cable 58

RJ-45 Pin Assignments 58

C TECHNICAL SPECIFICATIONS

	Switch 4400
	(24-port)	61
	Switch 4400
	(48-port)	63
D TECHNICAL SUPPORT
	Online Technical Services			65
	World Wide Web Site			65
	3Com Knowledgebase Web Services				65
	3Com FTP Site		66
	Support from Your Network Supplier				66
	Support from 3Com		66
	Returning Products for Repair 68

INDEX

REGULATORY NOTICES

ABOUT THIS GUIDE

This guide provides all the information you need to install and use a SuperStack® 3 Switch 4400 in its default state.

This guide is intended for use with both Switch 4400 models:

■3C17203 — 24 10BASE-T/100BASE-TX ports

■3C17204 — 48 10BASE-T/100BASE-TX ports

All procedures described in this guide apply to both models.

The guide is intended for use by network administrators who are responsible for installing and setting up network equipment; consequently, it assumes a basic working knowledge of LANs (Local Area Networks).

If the information in the release notes that are shipped with your product differ 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) or HTML on the 3Com World Wide Web site:

http://www.3com.com/

8 ABOUT THIS GUIDE

Conventions	Table 1 and Table 2 list conventions that are used throughout this guide.
	Table 1	Notice Icons
	Icon	Notice Type		Description
		Information note Information that describes important features 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.
	Syntax		The word “syntax” means that you must evaluate the syntax
			provided and then supply the appropriate values for the
			placeholders that appear in angle brackets. Example:
			To change your password, use the following syntax:
				system password <password>
			In this example, you must supply a password for <password>.
	Commands		The word “command” means that you must enter the
			command exactly as shown and then press Return or Enter.
			Commands appear in bold. Example:
			To display port information, enter the following command:
				bridge port detail
	The words “enter”		When you see the word “enter” in this guide, you must type
	and “type”		something, and then press Return or Enter. Do not press
			Return or Enter when an instruction simply says “type.”
	Keyboard key names		If you must press two or more keys simultaneously, the key
			names are linked with a plus sign (+). Example:
				Press Ctrl+Alt+Del
	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.

Related Documentation

9

Related	In addition to this guide, each Switch documentation set includes the
Documentation	following:
	■ SuperStack 3 Switch Implementation Guide
	This guide contains information on the features supported by your
	Switch and how they can be used to optimize your network.
	■ SuperStack 3 Switch Management Quick Reference Guide
	This guide contains a summary of the web interface and command
	line interface commands for the Switch.
	■ SuperStack 3 Switch Management Interface Reference Guide
	This guide provides detailed information about the web interface and
	command line interface that enable you to manage the Switch. It is
	supplied in HTML format on the CD-ROM that accompanies the
	Switch.
	■ Release Notes
	These notes provide information about the current software release,
	including new features, modifications, and known problems.
	There are other publications you may find useful, such as:
	■ Documentation accompanying the Advanced Redundant Power
	system.
	■ Documentation accompanying the Expansion Modules.
	■ Documentation accompanying 3Com Network Supervisor. This is
	supplied on the CD-ROM that accompanies the Switch.

Accessing Online The CD-ROM supplied with your Switch contains the following online Documentation documentation:

■SuperStack 3 Switch Implementation Guide (PDF format)

■SuperStack 3 Switch Management Interface Reference Guide (HTML format)

1To access the documentation insert the CD-ROM into your CD-ROM drive. If your PC has auto-run enabled, a splash screen will be displayed automatically.

2Select the Documentation section from the contents page.

10 ABOUT THIS GUIDE

If the online documentation is to be accessed from a local drive or server, you will need to access the CD-ROM contents via the root directory and copy the files from the CD-ROM to a suitable directory.

■ The HTML Reference Guide is stored in the Docs/reference directory

	on the CD-ROM. The documentation is accessed using the
	contents.htm file.
	■ The PDF Implementation Guide is stored in the
	Docs/implementation directory of the CD-ROM.
	3Com recommends that you copy the Docs/reference directory as a
	whole to maintain the structure of the files.
Product	You can register your SuperStack 3 Switch 4400 on the 3Com Web site:
Registration	http://support.3com.com/registration/frontpg.pl
Documentation	Your suggestions are very important to us. They will help make our
Comments	documentation more useful to you. Please e-mail comments about this
	document to 3Com at:
	[e-mail]
	Please include the following information when commenting:
	■ Document title
	■ Document part number (on the title page)
	■ Page number (if appropriate)
	Example:
	Part Number DUA 1720-3AAA0x
	SuperStack 3 Switch 4400 Getting Started Guide
	Page 21

1	INTRODUCING THE
	SUPERSTACK 3 SWITCH 4400

This chapter contains introductory information about the Switch 4400 and how it can be used in your network. It covers summaries of hardware and software features and also the following topics:

■About the Switch 4400

■Switch 4400 — Front View Detail

■Switch 4400 — Rear View Detail

■Default Settings

12 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 4400

About the Switch The Switch 4400 is a stackable 10/100 Mbps device and provides 4400 high-performance work groups with a backbone to server connection.

The Switch 4400 allows Cascade, Gigabit Ethernet or Fast Ethernet Fiber connections when expansion modules are installed in the expansion slots on the rear of the unit. You can also add the Switch 4400 to any SuperStack® system as your network grows.

Summary of Table 3 summarizes the hardware features that are supported by the

Hardware Features Switch 4400.

Table 3 Hardware features

Feature	Switch 4400
Addresses	■ Up to 8000 supported
	■ Up to 64 permanent entries
Auto-negotiation	■ Supported on all ports
	■ Auto MDI/MDI-X
Forwarding Modes	Store and Forward
Duplex Modes	Half and full duplex on all front panel ports
Flow Control	In full duplex operation all ports are supported
Smart Auto-sensing	Supported on all ports
Traffic Prioritization	Supported (IEEE 802.ID): 4 queues per port
Ethernet and Fast Ethernet	Auto-negotiating 10BASE-T/100BASE-TX ports
Ports
RPS Support	Connects to SuperStack 3 Advanced Redundant
	Power System (ARPS) (3C16071B)
Mounting	19-inch rack or stand-alone mounting

About the Switch 4400 13

Summary of Software Table 4 summarizes the software features that are supported by the Features Switch 4400.

Table 4 Software features

Feature	Switch 4400
Automatic IP	Supported
Configuration
Resilient Links	Supported
Aggregated Links	Supported stack-wide
Broadcast Storm Control	Supported
Virtual LANs (VLANs)	Support for up to 60 VLANs using the IEEE 802.1Q
	standard
Multicast Filtering	■ 128 Multicast filter groups supported
	■ IGMP filtering supported
Spanning Tree Protocol	Supported
(802.1D-1998)
Roving Analysis Port	Supported
Rapid Spanning Tree	Supported
Protocol (802.1w)
Webcache Support	Supported
Quality of Service (QoS)	Supported
RMON	Four groups supported: Statistics, History, Alarms,
	Event
Email Notification of	Supported
Events
Management	Web interface, command line interface, and SNMP
	supported
Port Security	Disconnect Unauthorized Device (DUD) supported

For information about managing the software features of the Switch, refer to the “SuperStack 3 Switch Management Interface Reference Guide” on the CD-ROM that accompanies the Switch.

14 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 4400

Switch 4400 —

Figure 1 Switch 4400 (24-port) — front view

Front View Detail

Figure 2 Switch 4400 (48-port) — front view

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.

Switch 4400 — Front View Detail 15

10BASE-T/ The Switch has 24 or 48 auto-negotiating 10BASE-T/100BASE-TX ports 100BASE-TX Ports configured as Auto MDIX (cross-over). These ports automatically provide

the appropriate connection. Alternatively, you can manually set these ports to 10BASE-T half duplex, 10BASE-T full duplex, 100BASE-TX half duplex or 100BASE-TX full duplex. The maximum segment length is 100 m (328 ft) over Category 5 twisted pair cable.

LEDs Table 5 lists LEDs visible on the front of the Switch, and how to read their status according to color. For information on using the LEDs for problem solving, see “Solving Problems Indicated by LEDs” on page 46.

Table 5	LED behavior
LED	Color	Indicates
Port Status LEDs
Packet	Green	Full duplex packets are being transmitted/received on the
		port.
	Yellow	Half duplex packets are being transmitted/received on the
		port.
	Off	No packets are being transmitted/received on the port.
Status	Green	A high speed (100 Mbps) link is present, and the port is
		enabled.
	Green flashing	A high speed (100 Mbps) link is present, but the port is
		disabled.
	Yellow	A low speed (10 Mbps) link is present, and the port is
		enabled.
	Yellow flashing	A low speed (10 Mbps) link is present, but the port is
		disabled.
	Off	No link is present.
Module Packet LEDs
	Green	Full duplex activity being received or transmitted
	Yellow	Half duplex activity being received or transmitted
	Off	No activity
Module Status LEDs
	Green	The Module is installed and supported. The Link Status has
		been determined, and the port is enabled.
	Green flashing	The Module is installed and supported. The Link Status has
		been determined, but the port is disabled.

(continued)

16 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 4400

LED	Color	Indicates
	Yellow	The Module is installed and supported. The Link status has
		not been determined or there is no Link for a single port
		Module.
	Yellow flashing	A Module is installed, however, it is not supported.
	Off	The Module is not installed.
Unit LEDs
1–8	Green	When the Switch forms a stack with other Switch 4400
		units, the LED indicates the position of the unit in the stack
		and that a link is present.
		When the Switch is stand-alone and not part of a stack, LED
		1 is on.
	Green rotating	When a software upgrade is in progress, the Unit LEDs of the
		unit that is being upgraded flash on and off in the following
		sequence —
		1,2,4,6,8,7,5,3 (24-port)
		1,2,3,4,8,7,6,5 (48-port)
	Green flashing	The Switch physically forms a stack with other Switch 4400
		units, but cannot be managed as part of that stack until all
		units have been upgraded to software version 2.0 or later.
	Off	A fault has occurred.
Power/Self Test LED
	Green	The Switch is powered-up and operating normally.
	Green flashing	The Switch is either downloading software or is initializing
		(which includes running a Power On Self Test).
	Yellow	The Switch has failed its Power On Self Test.
	Off	The Switch is not receiving power or there is a fault with the
		Power Supply Unit.

Switch 4400 — Rear View Detail 17

Switch 4400 — Rear Figure 3 Switch 4400 — rear view

View Detail

Power Socket The Switch automatically adjusts its power setting to any supply voltage in the range 90-260 VAC.

Redundant Power To protect against internal power supply failure, you can use this socket System Socket to connect a Switch 4400 to a SuperStack 3 Advanced Redundant Power

System (RPS). See “Connecting a Redundant Power System” on page 24.

Console Port The console port allows you to connect a terminal and perform remote or local out-of-band management. The console port uses a standard null modem cable and is set to auto-baud, 8 data bits, no parity and 1 stop bit.

Expansion Module You can use these slots to install Expansion Modules. These allow the Slots Switch to support various forms of connection and add extra functionality

to your Switch. Contact your supplier for more information.

WARNING: When an Expansion Module is not installed, ensure the blanking plate is fitted by tightening all screws with a suitable tool.

18 CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 4400

Default Settings Table 6 shows the default settings for the Switch 4400:

Table 6 Default Settings

Feature	Switch 4400
Automatic IP Configuration	Enabled
Port Status	Enabled
Port Speed	10/100 Mbps ports are auto-negotiated
Duplex Mode	All fixed 10BASE-T and 100BASE-TX ports are
	auto-negotiated
Flow Control	■ Enabled in half duplex
	■ Auto-negotiated in full duplex
Broadcast Storm Control	Enabled
Virtual LANs (VLANs)	All ports belong to the untagged Default VLAN
	(VLAN 1) with 802.1Q learning operational
IP Multicast Filtering	Filtering enabled
Rapid Spanning Tree Protocol	Enabled
	Fast Start:
	■ Enabled on front panel ports
	■ Disabled on rear panel port
RMON Alarm	Enabled
Smart Auto-Sensing	Enabled
Webcache Support	Disabled
Quality of Service (QoS)	All ports prioritize NBX VoIP traffic (LAN and IP).
	All ports set to “best effort” for all other traffic.

If you initialize a Switch unit by selecting System > Control > Initialize in the Web interface or by entering system control initialize in the Command Line Interface, the following settings are retained to allow you to connect to and manage the Switch:

■IP Address

■Subnet Mask

■Default Router

2	INSTALLING THE SWITCH

This chapter contains the information you need to install and set up the Switch 4400. It covers the following topics:

■Package Contents

■Choosing a Suitable Site

■Rack-mounting

■Placing Units On Top of Each Other

■The Power-up Sequence

WARNING: Safety Information. Before installing or removing any components from the Switch 4400 or carrying out any maintenance procedures, you must read the safety information provided in Appendix A of this guide.

AVERTISSEMENT: Consignes de sécurité. Avant d'installer ou d'enlever tout composant du Switch 4400 ou d'entamer une procédure de maintenance, lisez les informations relatives à la sécurité qui se trouvent dans l'Appendice A de ce guide.

VORSICHT: Sicherheitsinformationen. Bevor Sie Komponenten aus dem Switch 4400 entfernen oder dem Switch 4400 hinzufuegen oder Instandhaltungsarbeiten verrichten, lesen Sie die Sicherheitsanweisungen, die in Appendix A (Anhang A) in diesem Handbuch aufgefuehrt sind.

20 CHAPTER 2: INSTALLING THE SWITCH

Package Contents

■ Switch 4400 (24-port) (3C17203) or Switch 4400 (48-port) (3C17204)

■

■

■

■

■

■

■

■

■

■

■

CD-ROM

Getting Started Guide (this guide)

Implementation Guide

Management Quick Reference Guide

Release Notes

Unit Information Labels

Warranty Information

Power Cord

2 x Mounting brackets

4 x Screws

4 x Rubber feet

Choosing a Suitable The Switch is suited for use on a desktop, either free standing or

Site mounted in a standard 19-inch equipment rack. Alternatively, the Switch can be mounted in a wiring closet or equipment room, as an aggregator for other Hubs and Switches. A rack-mounting kit containing two mounting brackets is supplied with the Switch.

CAUTION: Ensure that the ventilation holes are not obstructed.

When deciding where to position the Switch, ensure that:

■Cabling is located away from:

■sources of electrical noise such as radios, transmitters and broadband amplifiers.

■power lines and fluorescent lighting fixtures

■The Switch is accessible and cables can be connected easily.

■Water or moisture cannot enter the case of the Switch.

■Air-flow is not restricted around the Switch or through the vents in the side of the Switch. 3Com recommends that you provide a minimum of 25mm (1in.) clearance.

■Air flow around the Switch does not exceed 40 °C (104 °F).

Rack-mounting 21

	If the Switch is installed in a 19-inch rack or closed assembly its local air
	temperature may be greater than room ambient temperature.
	■ The air is as free from dust as possible.
	■ The unit is installed in a clean, air conditioned environment.
	■ No more than eight Switch units are placed on top of one another, if
		the units are free-standing.
Rack-mounting	The Switch 4400 is 1U high and will fit in most standard 19-inch racks.
	CAUTION: Disconnect all cables from the Switch before continuing.
	Remove all self adhesive pads from the underside of the Switch if they
	have been fitted.
	To rack-mount your Switch:
	1 Place the Switch 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
	Switch, as shown in Figure 3.
	Figure 4 Fitting a bracket for rack-mounting

3 Insert the two screws and tighten with a suitable screwdriver.

22 CHAPTER 2: INSTALLING THE SWITCH

You must use the screws supplied with the mounting brackets. Damage caused to the unit by using incorrect screws invalidates your warranty.

4Repeat steps 2 and 3 for the other side of the Switch.

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

6Connect network cabling.

7Finally place a unit information label on the unit in an easily accessible position. The unit information label shows the following:

■The 3Com product name of the Switch

■The 3Com 3C number of the Switch

■The unique MAC address (Ethernet address) of the Switch

■The serial number of the Switch

You may need this information for fault reporting purposes.

Placing Units On	If the Switch units are free-standing, up to eight units can be placed one
Top of Each Other	on top of the other. If you are mixing a variety of SuperStack® 3 Switch
	and Hub 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.
Stacking Units	Switch 4400 units can be stacked together and then treated as a single
	manageable unit with one IP address. Any combination of 24-port and
	48-port units is allowed in a single stack, as long as the total number of
	front panel ports does not exceed the limit of 192 ports. The following
	combinations are allowed:
	■ 4 x 48-port Switches
	■ 3 x 48-port Switches and 2 x 24-port Switches
	■ 2 x 48-port Switches and 4 x 24-port Switches
	■ 1 x 48-port Switch and 6 x 24-port Switches
	■ 8 x 24-port Switches

The Power-up Sequence 23

Using the Expansion Module slot at the rear of the Switch, you can stack

Switch units together in two ways:

■ The SuperStack 3 Switch Cascade Stacking Kit (3C17227) consists of two Cascade Modules and a Cascade Cable. This kit allows you to connect two Switch 4400 units together.

■ The SuperStack 3 Cascade Extender Kit (3C17228) consists of one Cascade Module, one Cascade Cable and one Cascade Extender Unit. This kit allows you to connect any of the combinations of Switch 4400 units shown in “Stacking Units” on page 22. Each Cascade Extender Kit enables you to add one additional Switch to your stack.

	For more information contact your supplier, and refer to the user
	documentation that accompanies these Cascade Kits.
	When the Switch 4400s are stacked together they are assigned a unit
	number from bottom-to-top for management purposes. When further
	switches are added to the stack, they can be positioned at the bottom of
	the stack or at the top. Either way, the Switch management software will
	re-order the Switch unit numbers into a logical order again (from bottom
	to top).
The Power-up	The following sections describe how to get your Switch 4400
Sequence	powered-up and ready for operation.
Powering-up the	Use the following sequence of steps to power-up the Switch.
Switch 4400

1Plug the power cord into the power socket at the rear of the Switch.

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

The Switch powers-up and runs through its Power On Self Test (POST), which takes approximately 10 seconds.

Checking for Correct During the Power On Self Test, all ports on the Switch are disabled and Operation of LEDs the LEDs light in a set sequence.

When the POST has completed, check the Power/Self Test LED to make sure that your Switch is operating correctly. Table 7 shows possible colors for the LED.