3Com 4210 9-PORT, 4210 PWR 18-PORT, 4210 PWR 26-PORT, 4210 18-PORT, 4210 26-PORT, 4210 52-PORT System

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Connecting a Redundant Power Supply

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WARNING: When powering any Switch 4210 from an RPS, make sure that the unit is earthed (grounded) 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). Ensure that the earth connection is made before connecting the DC supply from the RPS.

3Com switches that support -48V DC RPS inputs, and are PoE enabled, can only be powered by an RPS that complies with the isolation requirements of IEEE-Std 802.3af. Non PoE enabled switches do not have this restriction.

WARNING: Do not use a standard 'positive-earthed' -48V redundant power system suitable for use with telecommunications equipment 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.

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 4210 DC supply input are provided in Table 11 on page 19.

You can power the Switch 4210 using three methods:

■AC Mains only — this does not offer any power redundancy. If the AC mains supply or the AC power supply fails, the switch powers 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 environments where only DC power is available.

The RPS provides two main benefits:

■Power Redundancy — if a switch is powered from the mains supply unit, a failure of the internal power supply causes the switch to fail. You can avoid this by connecting both the AC and DC RPS supplies to the switch. You can also add redundancy to the DC power by using (N+1) DC power supplies to further increase the availability of the system.

■Uninterruptable Power — the system allows easy connection and maintenance of batteries to the RPS shelf to further increase the availability of the system.

Specifying the 3Com’s redundant power solution allows you to use any off-the-shelf -48V DC Redundant Power RPS that meets the requirements defined in Table 11 on page 19.

System

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 you can increase the total -48V power available by adding rectifiers. For example, three

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Contents 3Com Switch 4210 Family United States Government Legend 3Com Corporation Campus Drive Marlborough, MA USAContents Regulatory Notices Obtaining Support for Your 3COM ProductsAbout this Guide Related Documentation Description of their features Wire-speed Layer 2 switchingProduct Introduction OverviewSwitch 4210 9-port PWR Front panel Introduction to Switch 4210 Family PWR SwitchesRear panel Power systemSide panel Cooling systemFront panel of a Switch 4210 18-port PWR Shows the front panel of the Switch 4210 26-port PWR model DC input-Rated voltage range -52 VDC to -56 VDC Switch 4210 26-port PWR units support AC input or DC inputAC input Front Panel LEDs Power LED10/100BASE-TX Autosensing Ethernet Port Status LED Mbps Uplink Port Status LEDThis section describes each Switch 4210 Family model Introduction to the Switch 4210 Family Non-PWR ModelsSwitch 4210 9-port Front panel Panel StatusSwitch 4210 18-port Front panel Switch 4210 cools off naturallySwitch 4210 18-port model’s rear panel Switch 4210 26-port Front panelSwitch 4210 26-port rear panel Switch 4210 52-port Front PanelDescribes the Speed LED on the 10/100Base-TX port Port LEDDescribes the 10/100Base-TX autosensing port’s Link/Act LED Switch Model Port PWR Technical SpecificationsTechnical specifications for the Switch Earthing Lead Technical specifications for the Switch 4210 PWR modelsSFP modules supported by the Switch SwitchSFP Modules Supported forProduct Introduction Installing the Switch Installing the Switch Mount the front bracket to the device Screw Front Installing the switch in a 19-inch rackInstallation completed Sequence Power-upReady for operation 4210Redundant Power Supply Connecting a52 for a list of suggested solutions PWR LED ColorsSystem Switch 4210 Circuit Breaker and Cable Ratings Power AvailabilityRectifiers No Rectifier Redundancy +1 RectifierRPS Connection to the Switch Using Power over EthernetRJ-45 Signal Direction DB9 console ConnectingConsole Cable Terminal, as shown in FigureGND RXD DSR CTS Installing the Switch Managing Your Switch System View Methods of Managing a SwitchUser View Refer to Setting Up Snmp Management on Setting Up YourConfigured IP information Need toSnmp Configuring IP ManuallyAutomatically Configuring the IP Address using Dhcp Viewing Configured IPAutomatically InformationUser View Login Connecting to Console Port Manually Configuring IP InformationYou can manually configure the switch IP information by Connecting the Workstation to the SwitchOnce you have logged in you are automatically in User View Setting Up the Switch with IP InformationPrerequisites Using the Web Interface Enter the system-viewcommand and Enter Using Command Line Interface using TelnetManagement Where xxx.xxx.xxx.xxx is the IP address of the switchConsole Port Connection Network TelnetManagement using Setting Up CommandSetting Up Web Line InterfaceString is private Setting Up SnmpNew community string up to 32 characters String to be removedPasswords Default UsersDefault Users User Default Name Password Access LevelProblem Solving Indicated by LEDs Solving ProblemsSolving Hardware ProblemsError message indicating that the SFP transceiver is faulty Solving Communication ProblemsIP Addressing How do you obtain a registered IP Address?Solving Fabric Formation ProblemsProblem Solving Null Modem Cable PIN-OUTSPC-AT Serial Cable RJ-45 to RS-232 25-pinPin assignments Ethernet Port RJ-45 Pin Assignments10/100 and 1000BASE-T RJ-45 connections Obtaining Support for Your 3COM Products Contact Us Available for purchase from your 3Com resellerTelephone Technical Support and RepairCountry Telephone Number US and Canada Telephone Technical Support and Repair Latin America Telephone Technical Support and Repair3Com Network 3COM Network ManagementSupervisor DirectorAppendix C 3COM Network Management Management Suite 3Com EnterpriseIntegration Kit with HP OpenViewAppendix C 3COM Network Management Important Safety Information Safety InformationWichtige Sicherheitsinformationen ’information de Sécurité ImportanteInformación de Seguridad Importante Appendix D Redundant Power Supply Safety Information Importanti Informazioni di Sicurezza Ważne informacje o zabezpieczeniachAppendix D Redundant Power Supply Safety Information Regulatory Notices How to identify and resolve radio-TV interference problemsAppendix D Redundant Power Supply Safety Information
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