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CONTENTS
ABOUT THIS GUIDE
Before You Start 7
Conventions 8
Related Documentation 8
Documentation Comments 8
1INTRODUCINGTHE
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
2INSTALLINGTHE 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
3SETTING UPFOR 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
4CREATINGA STACK
How To Interconnect Units 59
Guidelines For Interconnecting Units 60
Unit Numbering within the Stack 61
5PROBLEM SOLVING
Solving Problems Indicated by LEDs 64
Solving Hardware Problems 65
Solving Communication Problems 67
Solving Stack Formation Problems 69
6UPGRADING 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
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 StartThe 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/
8ABOUT THIS GUIDE
ConventionsTa bl e 1 lists conventions that are used throughout this guide.
Ta bl e 1 Notice Icons
IconNotice TypeDescription
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 Comments9
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.
10ABOUT THIS GUIDE
1
INTRODUCINGTHE
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
12CHAPTER 1: INTRODUCINGTHE 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 Port242*2*1
Switch 4500 50 Port482*2*2†1
Switch 4500 PWR 26 Port242*2*2†11
Switch 4500 PWR 50 Port482*2*2†11
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 Detail13
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
FeatureSwitch 4500
Addresses Up to 8,000 supported
Auto-negotiationSupported on all non-SFP ports
Forwarding ModesStore and Forward
Duplex ModesHalf and full duplex on all ports
Auto MDI/MDIXSupported on all ports. If fiber SFP transceivers are
used, Auto MDIX is not supported.
Flow ControlIn full duplex operation all ports are supported
Traffic PrioritizationSupported (using the IEEE Std 802.ID, 1998 Edition):
Eight traffic queues per port
Power over EthernetSupported on 10/100 ports (3CR17571-91 and
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
14CHAPTER 1: INTRODUCINGTHE 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
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 Detail15
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 PortsSwitch 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.
16CHAPTER 1: INTRODUCINGTHE 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 Detail17
Unit LEDThe 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
LEDsTa 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
LEDColorIndicates
Unit LED
GreenPower 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 flashingThe 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
GreenThe Switch is powered-up and operating normally.
Green flashingSelf Test (POST) or Software Download is in progress.
Yellow flashingOne or more ports have failed POST.
RedThe Switch has failed its Power On Self Test.
OffThe Switch is not receiving power or there is a fault with the
Mode LED (3CR17571-91 and 3CR17572-91 only)
Speed Green10/100 Port Speed and Activity, 1000 SFP Status and
Duplex Yellow10/100 Duplex and Activity, 1000 SFP Duplex and Activity,
PoERed10/100 Port showing PoE Information
critical.
Power Supply Unit.
Activity, or Stack Status and Activity.
or Stack Activity
18CHAPTER 1: INTRODUCINGTHE SWITCH 4500 FAMILY
LEDColorIndicates
RPS LED (3CR17571-91 and 3CR17572-91 only)
GreenAC and RPS supply connected.
YellowAC failed or not connected. RPS supply is OK.
OffThere is no RPS supply connected.
10BASE-T/100-TX Port LEDs
Speed GreenA high speed (100 Mbps) link is present, blinking off for
YellowA low speed (10 Mbps) link is present, blinking off for every
Yellow Flashing The port has failed POST.
OffNo link is present.
Duplex (3CR17571-91 and 3CR17572-91 only)
GreenFull duplex, blinking off for every packet received or
YellowHalf duplex, blinking off for every packet received or
Yellow flashingThe port has failed POST.
OffNo link is present.
PoE (3CR17571-91 and 3CR171572 only)
GreenPower is being delivered to the port.
Green flashingPort power has exceeded limit or is unable to supply power
YellowPoE error, no power supplied on port.
Yellow flashingThe port has failed post.
OffNo power is being delivered.
1000BASE-X SFP Port LEDs
Speed Green A high speed (1000 Mbps) link is present.
Yellow Flashing Port failed POST.
OffNo link is present.
Duplex (3CR17571-91 and 3CR17572-91 only)
GreenFull duplex packets are being transmitted/received on the
YellowHalf duplex packets are being transmitted/received on the
Yellow flashingPort failed POST.
OffNo 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 Detail19
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 SocketThe 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.
20CHAPTER 1: INTRODUCINGTHE 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 SettingsTa bl e 5 shows the default settings for the Switch 4500 Family:
Ta bl e 5 Default Settings
FeatureSwitch 4500
Automatic IP ConfigurationEnabled
Port StatusEnabled
Port SpeedAuto-negotiated
Duplex ModeAuto-negotiated
Power over EthernetEnabled (3CR17571-91 and 3CR17572-91 only)
Flow ControlAuto-negotiated
Broadcast Storm ControlEnabled
Virtual LANs (VLANs)All ports belong to the untagged Default VLAN
Management VLANAny VLAN for all units.
Link Aggregation Control
Protocol (LACP)
IP Multicast FilteringFiltering enabled
Rapid Spanning Tree Protocol Enabled
Fast StartEnabled on front panel ports
RMON AlarmEnabled
1) with IEEE Std 802.1Q-1998 learning
(VLAN
operational
Disabled per port
Default Settings21
FeatureSwitch 4500
Traffic PrioritizationAll ports prioritize NBX VoIP traffic (LAN and IP).
All ports set to “best effort” for all other traffic.
Port SecurityDisabled per port
Configuration Save and
Restore
Disabled
22CHAPTER 1: INTRODUCINGTHE SWITCH 4500 FAMILY
INSTALLINGTHE 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
24CHAPTER 2: INSTALLINGTHE 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 PWR25
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.
26CHAPTER 2: INSTALLINGTHE 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 PWR27
Ta bl e 6 Switch Power Inputs
Specifying the
Redundant Power
System
Power Input before
User Intervention
AC mains and RPSRPS onlyThe unit remains powered by the RPS.
AC mains and RPSAC mains onlyThe unit is powered by the AC mains.
RPS onlyAC mains and RPSThe unit remains powered by the RPS.
AC mains AC mains and RPSThe 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.
28CHAPTER 2: INSTALLINGTHE 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
123456
1500W3000W4500W6000W7500W 9000W
-1500W3000W4500W6000W 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 PoE6A C type18 AWG (solid or stranded cable)
PoE25A C type12 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 PWR29
+
-
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.
30CHAPTER 2: INSTALLINGTHE 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 LEDThe 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
ColorState
GreenAC and RPS supply connected.
YellowAC failed or not connected. RPS supply is ok.
OffThere 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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