3COM 4500 PWR 50-PORT, 4500 PWR 26-PORT, 4500 26-PORT, 4500 50-PORT User Manual 2

3Com® Switch 4500 Family
Getting Started Guide
Switch 4500 26-Port Switch 4500 50-Port Switch 4500 PWR 26-Port Switch 4500 PWR 50-Port
3Com Corporation 350 Campus Drive Marlborough, MA USA 01752-3064
Copyright © 2006-2007, 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
Before You Start 7 Conventions 8 Related Documentation 8 Documentation Comments 8
1 INTRODUCING THE
SWITCH 4500 FAMILY
About the Switch 4500 12
Summary of Hardware Features 13
Switch 4500 — Front View Detail 13
10BASE-T/ 100BASE-TX Ports 15 Gigabit Ports 15 Console Port 16 Unit LED 17 LEDs 17
Switch 4500 — Rear View Detail 19
Power Socket 19 Open Book Warning Labels 19 Redundant Power System Socket 20
Default Settings 20
2 INSTALLING THE SWITCH
Package Contents 23 Important Steps Before Proceeding 24 Connecting a Redundant Power Supply to your Switch 4500 PWR 24
Specifying the Redundant Power System 27 Connecting the Switch to the Redundant Power System 28 Connecting the Earthing Cable 30 RPS LED 30
Using Power over Ethernet 30
The Power-up Sequence 32
Powering-up the Switch 4500 32 Checking for Correct Operation of LEDs 32 Choosing the Correct Cables for the 1000BASE-X SFP Ports 33
SFP Operation 34
Approved SFP Transceivers 34 Inserting an SFP Transceiver 35 Removing an SFP Transceiver 35
Packing and Shipping the Switch 4500 36
3 SETTING UP FOR MANAGEMENT
Methods of Managing a Switch 38
Command Line Interface Management 38 Command Line Interface Management using SSH 39 Web Interface Management 39 SNMP Management 39
Setting Up Overview 40
IP Configuration 41 Preparing for Management 42
Manually Configuring IP Information 43
Connecting to the Console Port 43 Connecting to a Front Panel Port 46
Viewing Automatically Configured IP Information 49
Using 3Com Network Director 50 Connecting to the Console Port 50
Setting Up Command Line Interface Management 52
User Interface Overview 52 CLI Management via the Console Port 52
CLI Management over the Network 52 Setting Up Command Line Interface Management using SSH 53 Setting Up Web Interface Management 54
Pre-requisites 54
Web Management Over the Network 55 Setting Up SNMP Management V1 or V2 55
Pre-requisites 56 Default Users and Passwords 56
4 CREATING A STACK
How To Interconnect Units 59 Guidelines For Interconnecting Units 60 Unit Numbering within the Stack 61
5 PROBLEM SOLVING
Solving Problems Indicated by LEDs 64 Solving Hardware Problems 65 Solving Communication Problems 67 Solving Stack Formation Problems 69
6 UPGRADING SOFTWARE
The Contents of the Executable File 72 Upgrading from the Command Line Interface 72
Introduction 72 Backup 74 TFTP 74 FTP
(via a network port) 76 XModem (via the console cable) 77
Upgrading from the Bootrom Interface 78
Introduction 78 TFTP 80 FTP 80 XModem 81
Bootrom Upgrade 82
Bootrom Upgrade via TFTP 83
Bootrom Upgrade via FTP 83
Bootrom Upgrade via XModem 84
A PIN-OUTS
Null Modem Cable 87 PC-AT Serial Cable 87 Modem Cable 88
Ethernet Port RJ-45 Pin Assignments 88
B TECHNICAL SPECIFICATIONS
Switch 4500 (26 Port) 91 Switch 4500 (50 Port) 92 Switch 4500 PWR (26 Port) 93 Switch 4500 PWR (50 Port) 94 RPS 95 Earthing Lead 95
C OBTAINING SUPPORT FOR YOUR PRODUCT
Register Your Product 97 Purchase Value-Added Services 97 Troubleshoot Online 98 Access Software Downloads 98 Telephone Technical Support and Repair 98 Contact Us 99
INDEX

ABOUT THIS GUIDE

This guide provides all the information you need to install and use the following switches in their default state:
Switch 4500 26-Port (3CR17561-91)
Switch 4500 50-Port (3CR17562-91)
Switch 4500 PWR 26-Port (3CR17571-91)
Switch 4500 PWR 50-Port (3CR17572-91)
All procedures described in this guide apply to all models except where stated.
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).

Before You Start The Release Notes provide important information about the current

software release, including new features, modifications, and known problems. You should read the Release Notes before installing the Switch in your network.
If the information in the Release Notes differ from the information in this guide, follow the instructions in the Release Notes.
The latest versions of user guides and release notes are available in Adobe Acrobat Reader Portable Document Format (PDF) on the 3Com
Wide Web site:
World
http://www.3com.com/
8 ABOUT THIS GUIDE

Conventions Ta bl e 1 lists conventions that are used throughout this guide.

Ta bl e 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

Related Documentation

Documentation Comments

In addition to this guide, each Switch documentation set includes the following:
Switch 4500 Configuration Guide
This guide contains information on the features supported by your
Switch and how they can be used to optimize your network.
Switch 4500 Quick Reference Guide
This guide contains:
a list of the features supported by the Switch.
a summary of the command line interface commands for the
Switch. This guide is also available under the Help button on the web interface.
Switch 4500 Command Reference Guide
This guide provides detailed information about the web interface and
command line interface that enable you to manage the Switch
Release Notes
These notes provide information about the current software release,
including new features, modifications, and known problems. The
Release Notes are supplied in hard copy with your Switch.
Your suggestions are very important to us. They will help make our documentation more useful to you. E-mail comments about this document to 3Com at:
pddtechpubs_comments@3com.com
Documentation Comments 9
Please include the following information when commenting:
Document title
Document part number (on the title page)
Page number (if appropriate)
Example:
Part Number 10015034 Rev. AB Switch 4500 Family Getting Started Guide
Page 21
We can only respond to comments and questions about 3Com product documentation at this e-mail address. Please direct all questions related to technical support or sales in the first instance to your network supplier.
10 ABOUT THIS GUIDE
1

INTRODUCING THE SWITCH 4500 FAMILY

This chapter contains introductory information about the Switch 4500 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 4500
Switch 4500 — Front View Detail
Switch 4500 — Rear View Detail
Default Settings
12 CHAPTER 1: INTRODUCING THE SWITCH 4500 FAMILY

About the Switch 4500

The Switch 4500 Family are mixed media devices. Table 2 summarizes what each Switch consists of:
Ta bl e 2 Switch 4500 Family Hardware
Switch 4500 Family
Switch 4500 26 Port 24 2* 2* 1
Switch 4500 50 Port 48 2* 2* 2 1
Switch 4500 PWR 26 Port 24 2* 2* 2 1 1
Switch 4500 PWR 50 Port 48 2* 2* 2 1 1
10BASE-T\100BASE-TX Ports
10BASE-T\100BASE-TX PoE Ports
10BASE-T\1000BASE-TX\1000BASE-T Ports
1000BASE-X SFP Ports
1000BASE-T SFP Transceiver
RJ-45 Console Port
-48V DC RPS Input
* Combo SFP and 10/100/1000 Ports
† 1000BASE-T SFP transceiver installed in last two 1000BASE-X SFP ports
The Switch 4500 Family provides workgroup connectivity at 10- and 100-Mbps, and high-speed Gigabit ports for stacking, uplinks to a backbone, or for server connections. With stacking, you can add additional Switch 4500s as your network grows while preserving ease of management.
For information about using the software features of the Switch, refer to the “Command Reference Guide” on located on 3Com’s Web site at www.3com.com.
Switch 4500 — Front View Detail 13
Unit LED
Console Port
Power LED
10/100BASE-TX Ports
Port Status LEDs
1000BASE-X
Combo Port
Pair
3CR17561-91 SuperStack 3 Switch 4500 26-Port
10/100/1000BASE-T
Combo Port Pair
1000BASE-X
10/100BASE-TX
10/100/1000BASE-T
Speed: (100Base-TX) Green = 100Mbps Yellow = 10Mbps (1000Base-X) Green = 1000Mbps Yellow = 10/100Mbps Duplex: Green = Full Duplex, Yellow = Half Duplex
2625
27/25
28/26
Summary of
Hardware Features
Ta bl e 3 summarizes the hardware features that are supported by the Switch 4500.
Ta bl e 3 Hardware Features
Feature Switch 4500
Addresses Up to 8,000 supported
Auto-negotiation Supported on all non-SFP ports
Forwarding Modes Store and Forward
Duplex Modes Half and full duplex on all ports
Auto MDI/MDIX Supported on all ports. If fiber SFP transceivers are
used, Auto MDIX is not supported.
Flow Control In full duplex operation all ports are supported
Traffic Prioritization Supported (using the IEEE Std 802.ID, 1998 Edition):
Eight traffic queues per port
Power over Ethernet Supported on 10/100 ports (3CR17571-91 and
Ethernet and Fast Ethernet Ports
Gigbait Ethernet Ports Auto-neogotiating 10BASE-T/100BASE-TX/
SFP Ethernet Ports Supports fiber Gigabit Ethernet short-wave (SX),
RPS Supplemental PoE
Power
Mounting 19-inch rack or stand-alone mounting
3CR17572-91 only)
Auto-negotiating 10BASE-T/100BASE-TX ports
1000BASE-T ports (3CR17561-91) only
long-wave (LX), long-haul (LH70) and copper (T) transceivers in any combination.
Connects to -48v DC supply (3CR17571-91 and 3CR17572-91 only)
Switch 4500 — Front View Detail
Figure 1 Switch 4500 26-Port — front view
14 CHAPTER 1: INTRODUCING THE SWITCH 4500 FAMILY
Unit LE D
Console Por t
Mode LED
Power LE D
10/100BASE-TX Ports
Port Status LEDs
1000Base-X SFP Ports
(Two pairs of Combo Ports
fitted with two 1000BASE-T
SFP transceivers in last two ports)
3CR17571-91 SuperStack 3 Switch 4500 PWR 26-Port
10/100BASE-TX
Speed: (100Base-TX) Gr een = 100Mbps Ye llow = 10Mbps Duplex: Gr een = Full Duplex, Ye llow = Half Duplex Powe r : Gr een = Delivering Powe r, Ye llow = Fault, Flashing Gr een = Over Budget
PW R
RPS
RPS LE D
Mode Gr een=Speed Ye llow=Duplex Flashing=PoE
25
26
27/25
28/26
Unit LED
Console Port
Mode LED
RPS LED
10/100BASE-TX Ports
Port Status LEDs
1000BASE-X SFP Ports
(Two pairs of Combo Ports
fitted with two 1000BASE-T
SFP transceivers in last two ports)
PWR LED
3CR17572-91 SuperStack 3 Switch 4500 PWR 50-Port
PWR RPS
Mode Green=Speed Yellow=Duplex Flashing=PoE
Duplex:Green = Full Duplex, Yellow = Half DuplexSpeed:Green = 100Mbps, Yellow = 10Mbps
Power:Green = Deliverng Power. Yellow=Fault, Flashing Green=Over Budget
49
50
51/49
52/50
Figure 2 Switch 4500 50-Port — front view
Port Status LEDs
Duplex:Green = Full Duplex, Yellow = Half DuplexSpeed:Green = 100Mbps, Yellow = 10Mbps
3CR17562-91 SuperStack 3 Switch 4500 50-Port
Console Port
10/100BASE-TX Ports
Unit LED
49
1000BASE-X SFP Ports
(Two pairs of Combo Ports
fitted with two1000BASE-T SFP
transceivers in last two ports)
PWR LED
51/49
50
52/50
RPS LED
PWR RPS
Figure 3 Switch 4500 26-Port PWR - front view
Figure 4 Switch 4500 50-Port PWR - 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 4500 — Front View Detail 15
10BASE-T/

100BASE-TX Ports

The Switch 4500 has 24 or 48 auto-negotiating 10BASE-T/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 full0-duplex, 100BASE-TX half-duplex or 100BASE-TX full-duplex. The maximum segment length is
m (328 ft) over Category 5 twisted pair cable.
100

Gigabit Ports Switch 4500 10/100 Ethernet models support two simultaneous Gigabit

connections. Each switch has four Gigabit ports, arranged in two pairs called “dual-personality combo port pairs.” Only one port in each pair can be activeat a time.
The paired ports for the Switch 4500 26 Port and PWR 26 Port are:
25 and 27
26 and 28
The paired ports for the Switch 4500 50 Port and PWR 50 Port are:
49 and 51
50 and 52
By default, the ports are enabled as follows for the 26-Port switches:
Port 25 = active; Port 27 = inactive
Port 26 = active; Port 28 = inactive
By default, the ports are enabled as follows for the 50-Port switches:
Port 49 = active; Port 51 = inactive
Port 50 = active; Port 52 = inactive
To change which port is active, issue the undo shutdown command on the inactive port. This will enable the previously inactive port and disable its pair. Issuing this command will cause the switch to reboot.
A Gigabit connection can be either copper-based 1000Base-T or SFP-based fiberoptic connection. On the Switch 4500 10/100 26 Port unit, there are two SFP slots and two 1000Base-T ports. On the Switch 4500 PWR 26 Port, 50 Port, and PWR 50 Port models all the physical Gigabit ports are SFP slots.
16 CHAPTER 1: INTRODUCING THE SWITCH 4500 FAMILY
Two 1000Base-T SFP transceivers are included with these units. These SFP transceivers can be inserted in any of the four SFP slots to provide copper Gigabit connectivity. If you install these in the inactive ports, then you will need to issue the undo shutdown command on those ports to make them active.
SFP (Small Form Factor Pluggable, or mini-GBIC) ports support fiber Gigabit Ethernet short-wave (SX), long-wave (LX), long-haul (LH70) and copper (T) 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.
The default state for these ports is auto-negotiation enabled, where the speed, duplex and flow control modes are negotiated. As the speed and duplex modes are fixed by the media type, only the flow control is negotiated with the link partner. Alternatively, auto-negotiation can be disabled (except 1000BASE-T which auto-negotiation is mandatory) and the flow control setting can be manually configured.

Console Port The console port allows you to connect a terminal and perform remote or

local out-of-band management. As the console port on the Switch is an RJ-45 port, you will need to connect an RJ-45 to DB9 converter cable to a standard null modem cable in order to connect a terminal.
Switch 4500 — Front View Detail 17
Unit LED The Unit LED is a seven segment display visible on the front of the Switch.
The Unit LED can be used to indicate the unit number in a fabric, POST test ID and software upgrade information. In the unlikely event of a hardware fault occurring, the Unit LED may be used to help diagnose the problem. For information on using the Unit LED for problem solving, see “Solving Problems Indicated by LEDs” on page 64

LEDs Ta bl e 4 lists LEDs visible on the front of the Switch, and how to read their

status. For information on using the LEDs for problem solving, see “Solving Problems Indicated by LEDs” on page 64.
Ta bl e 4 LED Behavior
LED Color Indicates

Unit LED

Green Power On Self Test (POST) is in progress. During POST a the
test ID number appears in the Unit LED (seven segment display).
or
Software download is in progress. During software download, a clockwise cycling bar appears in the Unit LED.
Green flashing The Switch has failed POST. The Unit LED flashes the
number of the test that has failed.
Green flashing ‘f’ There has been a fan failure.
Green flashing ‘t’ The Switch is over temperature and unit temperature is
PWR LED
Green The Switch is powered-up and operating normally.
Green flashing Self Test (POST) or Software Download is in progress.
Yellow flashing One or more ports have failed POST.
Red The Switch has failed its Power On Self Test.
Off The Switch is not receiving power or there is a fault with the
Mode LED (3CR17571-91 and 3CR17572-91 only)
Speed Green 10/100 Port Speed and Activity, 1000 SFP Status and
Duplex Yellow 10/100 Duplex and Activity, 1000 SFP Duplex and Activity,
PoE Red 10/100 Port showing PoE Information
critical.
Power Supply Unit.
Activity, or Stack Status and Activity.
or Stack Activity
18 CHAPTER 1: INTRODUCING THE SWITCH 4500 FAMILY
LED Color Indicates
RPS LED (3CR17571-91 and 3CR17572-91 only)
Green AC and RPS supply connected.
Yellow AC failed or not connected. RPS supply is OK.
Off There is no RPS supply connected.
10BASE-T/100-TX Port LEDs
Speed Green A high speed (100 Mbps) link is present, blinking off for
Yellow A low speed (10 Mbps) link is present, blinking off for every
Yellow Flashing The port has failed POST.
Off No link is present.
Duplex (3CR17571-91 and 3CR17572-91 only)
Green Full duplex, blinking off for every packet received or
Yellow Half duplex, blinking off for every packet received or
Yellow flashing The port has failed POST.
Off No link is present.
PoE (3CR17571-91 and 3CR171572 only)
Green Power is being delivered to the port.
Green flashing Port power has exceeded limit or is unable to supply power
Yellow PoE error, no power supplied on port.
Yellow flashing The port has failed post.
Off No power is being delivered.
1000BASE-X SFP Port LEDs
Speed Green A high speed (1000 Mbps) link is present.
Yellow Flashing Port failed POST.
Off No link is present.
Duplex (3CR17571-91 and 3CR17572-91 only)
Green Full duplex packets are being transmitted/received on the
Yellow Half duplex packets are being transmitted/received on the
Yellow flashing Port failed POST.
Off No link is present.
every packet received or transmitted.
packet received or transmitted.
transmitted.
transmitted.
due to unit being over budget.
port.
port.
Switch 4500 — Rear View Detail 19

Power Socket

100-240V; 50/60Hz; 1A

Open Book Warning Labels

Earthing Screw
~
Power Socket
Redundant Power System Socket
100-240V; 50/60Hz; 7.0A
Open Book Warning Labels
NULL
Earthing Screw
~
-53 -55V;19.5A
Switch 4500 — Rear View Detail
Power Socket The Switch automatically adjusts its power setting to any supply voltage
Figure 5 Switch 4500 — rear view
Figure 6 Switch 4500 PWR - rear view
in the range 100-240 VAC.
Open Book Warning
Labels
Before installing or removing any components from the Switch 4500 or carrying out any maintenance procedures, you must read the safety information provided in
Appendix A of this guide.
AVERTISSEMENT: Avant d'installer ou d'enlever tout composant des commutateurs de la gamme Switch 4500 ou d'entamer une procédure de maintenance, lisez les informations relatives à la sécurité qui se trouvent dans l'annexe A de ce guide.
VORSICHT:Bevor Sie Komponenten der Switch 4500-Baureihe installieren oder deinstallieren und bevor Sie Wartungsarbeiten ausführen, müssen Sie die in Anhang A dieses Handbuchs aufgeführten Sicherheitshinweise lesen.
ADVERTENCIA: Antes de instalar o extraer cualquier componente del Switch 4500 Family o de realizar tareas de mantenimiento, debe leer la información de seguridad facilitada en el Apéndice A de esta guía.
20 CHAPTER 1: INTRODUCING THE SWITCH 4500 FAMILY
AVVERTENZA: Prima di installare o rimuovere qualsiasi componente dello Switch 4500 Family o di eseguire qualsiasi procedura di manutenzione, leggere le informazioni di sicurezza riportate nell'Appendice A di questa guida.
OSTRZEŻENIE: Przed instalacją lub usunięciem jakichkolwiek
elementów z przełącznika z rodziny 4500 lub przeprowadzeniem prac konserwacyjnych należy zapoznać się z informacjami o bezpieczeństwie zawartymi w Załączniku A niniejszego podręcznika.
Redundant Power
System Socket
Provides supplemental power for PoE ports (up to 15.4w on all ports) and redundant power for powered devices and the Switch itself.
Default Settings Ta bl e 5 shows the default settings for the Switch 4500 Family:

Ta bl e 5 Default Settings

Feature Switch 4500
Automatic IP Configuration Enabled
Port Status Enabled
Port Speed Auto-negotiated
Duplex Mode Auto-negotiated
Power over Ethernet Enabled (3CR17571-91 and 3CR17572-91 only)
Flow Control Auto-negotiated
Broadcast Storm Control Enabled
Virtual LANs (VLANs) All ports belong to the untagged Default VLAN
Management VLAN Any VLAN for all units.
Link Aggregation Control Protocol (LACP)
IP Multicast Filtering Filtering enabled
Rapid Spanning Tree Protocol Enabled
Fast Start Enabled on front panel ports
RMON Alarm Enabled
1) with IEEE Std 802.1Q-1998 learning
(VLAN operational
Disabled per port
Default Settings 21
Feature Switch 4500
Traffic Prioritization All ports prioritize NBX VoIP traffic (LAN and IP).
All ports set to “best effort” for all other traffic.
Port Security Disabled per port
Configuration Save and Restore
Disabled
22 CHAPTER 1: INTRODUCING THE SWITCH 4500 FAMILY

INSTALLING THE SWITCH

2
This chapter contains supplemental information on setting up your Switch
4500. These details are intended to be read together with the printed documents that accompany your switch.

Package Contents Switch unit

Unit Information Labels
Warranty Information
RPS Flyer
Power Cord
Console Cable (RJ-45)
RPS -48V DC Connector and backshell (3CR17571-91 and
3CR17572-91 only)
RPS Connector Cable Tie
Earthing Lead
2 x Front securing brackets
4 x Screws
2 x Back securing brackets and 2 x Screws (3CR17571-91 and
3CR17572-91 only)
4 x Rubber feet
Important Information Notice
Safety and Regulatory Information
24 CHAPTER 2: INSTALLING THE SWITCH

Important Steps Before Proceeding

Connecting a Redundant Power Supply to your Switch 4500 PWR

Before proceeding, make sure to access the Switch 4500 information on 3Com’s Web site at www.3Com.com and:
Read the document entitled “3Com Switch Family Safety and
Regulatory Information,” which contains information on how to
set-up your Switch 4500 and all the safety and regulatory warnings.
Refer to the document entitled “Important Information” for
instructions on how to retrieve the latest documentation and software
for your switch.
Set-up your switch in the desired location.
Download the documentation to your local hard-drive or to an
accessible server.
The Switch 4500 PWR 26 and 50 port have a -48V DC Redundant Power Supply socket that can be used in addition to the standard AC connection of the switch. If you intend to use this DC connection, please read this section.
WARNING: The installation of the Redundant Power Supply (RPS) should only be carried out by properly trained and qualified personnel.
WARNING: These instructions must be read in conjunction with the RPS flyer and the safety and installation instructions supplied with your RPS.
WARNING: When powering any Switch 4500 PWR from an RPS, the unit must be earthed (grounded). This can be achieved by either connecting the power cord to the unit or by connecting the earth terminal on the rear of the unit to a reliable electrical earth, or by connecting both. You must ensure that the earth connection is made before connecting the DC supply from the RPS.
3Com Switches which support -48V DC RPS inputs, that are PoE enabled, can only be powered by an RPS which complies with the isolation requirements of IEEE-Std 802.3af. Non PoE enabled switches do not have this restriction.
WARNING: A standard 'positive-earthed' -48V redundant power system suitable for use with telecommunications equipment should not be used
Connecting a Redundant Power Supply to your Switch 4500 PWR 25
with the 3Com Power-over-Ethernet (PoE) network switches. In order to meet the IEEE 802.3af (PoE) specification, the -48V output must be isolated from earth (ground) and meet the isolation requirements in that specification.
26 CHAPTER 2: INSTALLING THE SWITCH
WARNING: Any RPS must be approved as a SELV output in accordance with IEC 60950-1/UL 60950-1/EN 60950-1.
WARNING: The characteristics of the Switch 4500 DC supply input are given in Appendix B on page 91.
The Switch 4500 PWR units can be powered in three different ways:
AC Mains only — does not offer any power redundancy. If the AC
mains supply or the AC power supply fail, the Switch will power off.
AC Mains and -48V DC (primary supply) — the internal AC supply
acts as the backup in the event of a DC power failure.
DC only — the Switch does not need an AC supply and the resiliency
is provided by the DC supply. This is useful in an environment where
only DC power is available.
The RPS provides three main benefits to the customer:
Power Redundancy — if a Switch is powered from the mains supply
unit, a failure of the internal power supply will cause the Switch to fail.
This can be overcome by connecting both the AC and DC RPS supplies
to the Switch. Additional redundancy can also be added to the DC
power by using (N+1) DC power supplies to further increase the
availability of the system.
Uninterruptible Power — the system allows easy connection and
maintenance of batteries to the RPS shelf to further increase the
availability of the system.
Additional Power to PoE Ports — the internal AC Power Supply of
a PoE Switch can provide enough power for most network
applications. The RPS can be used to supplement additional power (up
to a maximum of 15.4W), including full backup of all PoE devices on
the network.
Ta bl e 6 below, outlines the behavior of the Switch when changes occur to the power system, such as removing the AC mains cable when the RPS is attached. The responses to the different power inputs are controlled by the Switch’s internal power supply and not by the RPS.
Connecting a Redundant Power Supply to your Switch 4500 PWR 27
Ta bl e 6 Switch Power Inputs
Specifying the
Redundant Power
System
Power Input before User Intervention
AC mains and RPS RPS only The unit remains powered by the RPS.
AC mains and RPS AC mains only The unit is powered by the AC mains.
RPS only AC mains and RPS The unit remains powered by the RPS.
AC mains AC mains and RPS The unit is powered by the RPS. PoE
Power Input after User Intervention
Correct Response
PoE dropped on all ports, however the unit does not reset. PoE restarts powered by the remaining power from the AC mains. PoE ports will be dropped depending on their preset priority level.
The total power available to the Switch may be less than when powered from the RPS. Some PoE ports may be dropped as they are unable to obtain the power they require.
ports can be added.
3Com’s redundant power solution allows the use of any off-the-shelf
-48V DC RPS that meets the requirements defined in
Appendix B on
page 91.
For an approved vendor list, more details about purchasing the 3Com recommended RPS and a full set of requirements go to:
http://www.3Com.com/RPS
The 3Com recommended RPS generates -48V DC power using power supply units (or rectifiers). The outputs of the rectifier(s) are connected together so that the total -48V power available can be increased by adding additional rectifiers. For example, three 1500W rectifiers can provide up to 4500W. Hot removal or insertion of a rectifier will not affect the -48V DC output voltage.
Ta bl e 7 shows an example of the total power available from a number of 1500W rectifiers.
A minimum of two rectifiers are required for each shelf to provide N+1 rectifier redundancy.
28 CHAPTER 2: INSTALLING THE SWITCH
Ta bl e 7 Power Availability
No Rectifier Redundancy
N+1 Rectifier Redundancy
The -48V DC power distribution provides the mechanism to connect to the Switch 4500 PWR. The distribution consists of a number of circuit breakers and connection terminals for the positive (common) and negative -48V outputs. Each Switch 4500 PWR must be individually connected to a circuit breaker terminal.
A battery can also be connected to battery terminals prior to the DC power distribution to provide uninterrupted power in order to protect against the loss of AC mains power.
Rectifiers
1 2 3 4 5 6
1500W 3000W 4500W 6000W 7500W 9000W
- 1500W 3000W 4500W 6000W 7500W
Connecting the
Switch to the
Redundant Power
System
3Com’s RPS solution uses -48V DC power distribution. The RPS system provides bulk -48V DC power that is separately distributed to a number of network switches.
Each RPS consists of a shelf which can house from one to six rectifiers, a Distribution Module and a Management Module.
When connecting the RPS to the Switch, the circuit breaker and 2-core cable need to be matched to the power rating of the Switch.
Ta bl e 8
shows the recommended circuit breaker and cable rating for the Switch
4500. The recommended cable length should not exceed 3 metres (9.84 feet).
Ta bl e 8 Switch 4500 Circuit Breaker and Cable Ratings
Circuit Breaker Minimum 2-Core Cable Diameter
Non PoE 6A C type 18 AWG (solid or stranded cable)
PoE 25A C type 12 AWG (solid or stranded cable)
WARNING: RPS Manufacturers recommendations must be followed when connecting the cable to the RPS.
Connecting a Redundant Power Supply to your Switch 4500 PWR 29
+
-
NULL
-48 -60V;2.0A
100-240V;50/60Hz;1.0A
~
NULL
-48 -60V;2 0A
Null
+
-
Pinout
Cable Tie
WARNING: Ensure that the circuit breaker in the RPS is in the open (off) position when connecting the cable to the RPS and the cable and connector to the Switch.
WARNING: You must ensure that the positive terminal on the Switch is connected to the positive (common) terminal of the RPS and that the negative terminal on the Switch is connected to the negative (circuit breaker) terminal of the RPS.
Figure 7 shows how to connect the power supply to the RPS socket in the back of the Switch. Use the cable tie supplied with your Switch to support the cable at the rear of the RPS connector as shown.
Figure 7 RPS Connection to the Switch
When the RPS is connected to the Switch, the circuit breaker in the RPS can be moved to the closed (on) position and the Switch will be powered by the -48V DC power.
30 CHAPTER 2: INSTALLING THE SWITCH
The -48V DC power will take priority over the AC mains and will power the Switch if it is connected.
Connecting the
Earthing Cable

RPS LED The RPS status LED on the front of the Switch 4500 PWR indicates the

Using Power over
Ethernet
Use the earthing cable that accompanies your Switch if the length is suitable. Alternatively use the earthing cable specification as defined in Appendix B on page 91.
The earthing cable is only required if the Switch is powered by the RPS only.
The recommended cable length should not exceed 3 metres (9.84 feet).
status of the RPS and AC supplies as shown in
Ta bl e 9 RPS LED Colors
Color State
Green AC and RPS supply connected.
Yellow AC failed or not connected. RPS supply is ok.
Off There is no RPS supply connected.
Ta bl e 9.
The Switch 4500 Power over Ethernet (PoE) units can supply power to any IEEE 802.3af compliant device through any of its 10/100 ports over a Category 5 or Category 5e Ethernet cable. The same cable connects the device to the network.
Power over Ethernet is a self-configuring protocol. When you plug a PoE compliant device into one of the ports on the Switch, the Switch will supply the power required to the device, providing that the total power budget for the Switch would not be exceeded by doing so.
A PoE Switch combines the functionality of a standard Ethernet Switch with a single power supply that can power multiple devices. Using a PoE Switch has the following advantages over an unpowered network:
Reduced Cabling — a PoE (802.3af) compliant device which has its
power supplied over its ethernet cable does not require a separate
power supply. If, for example, the Switch is used to connect a 3Com
11 Mbps Wireless LAN Access Point 8500 to the network, then only a
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