3Com 4210 PWR 26-PORT manual Power Availability, Switch 4210 Circuit Breaker and Cable Ratings

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30CHAPTER 2: INSTALLING THE SWITCH

1500W rectifiers can provide up to 4500W. Hot removal or insertion of a rectifier does not affect the -48V DC output voltage.

Table 14 shows an example of the total power available from several 1500W rectifiers.

A minimum of two rectifiers are required for each shelf to provide N+1 rectifier redundancy.

Table 14 Power Availability

			Rectifiers
	1	2	3	4	5	6

No Rectifier	1500W	3000W	4500W	6000W	7500W	9000W
Redundancy
N+1 Rectifier	-	1500W	3000W	4500W	6000W	7500W
Redundancy

The unearthed -48V DC power distribution provides the mechanism to connect to the Switch 4210. The distribution consists of several circuit breakers and connection terminals for the positive (common) and negative -48V outputs. Individually connect each Switch 4210 to a circuit breaker terminal.

You can also connect a battery to battery terminals prior to the DC power distribution to provide uninterrupted power and to be protected against the loss of AC mains power.

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 that can house from one to six rectifiers, a Distribution

Module, and a Management Module.

Connecting the Switch When connecting the RPS to the switch, the circuit breaker and 2-core cables need to the Redundant Power to be matched to the switch’s power rating. Table 15 shows the recommended

System circuit breaker and cable rating for the Switch 4210. The recommended cable length should not exceed three metres (9.84 feet).

Table 15 Switch 4210 Circuit Breaker and Cable Ratings

	Circuit Breaker	Minimum 2-Core Cable Diameter

PoE	25A C type	12 AWG (solid or stranded cable)

WARNING: Make sure to follow the RPS Manufacturers recommendations when connecting the cable to the RPS.

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: 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.

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Contents 3Com Switch 4210 Family 3Com Corporation Campus Drive Marlborough, MA USA United States Government LegendContents Obtaining Support for Your 3COM Products Regulatory NoticesAbout this Guide Related Documentation Product Introduction Wire-speed Layer 2 switchingDescription of their features OverviewIntroduction to Switch 4210 Family PWR Switches Switch 4210 9-port PWR Front panelSide panel Power systemRear panel Cooling systemFront panel of a Switch 4210 18-port PWR Shows the front panel of the Switch 4210 26-port PWR model Switch 4210 26-port PWR units support AC input or DC input AC inputDC input-Rated voltage range -52 VDC to -56 VDC 10/100BASE-TX Autosensing Ethernet Port Status LED Power LEDFront Panel LEDs Mbps Uplink Port Status LEDSwitch 4210 9-port Front panel Introduction to the Switch 4210 Family Non-PWR ModelsThis section describes each Switch 4210 Family model Panel StatusSwitch 4210 cools off naturally Switch 4210 18-port Front panelSwitch 4210 26-port Front panel Switch 4210 18-port model’s rear panelSwitch 4210 52-port Front Panel Switch 4210 26-port rear panelPort LED Describes the 10/100Base-TX autosensing port’s Link/Act LEDDescribes the Speed LED on the 10/100Base-TX port Technical Specifications Technical specifications for the SwitchSwitch Model Port PWR Technical specifications for the Switch 4210 PWR models Earthing LeadSFP Modules SwitchSFP modules supported by the Switch Supported forProduct Introduction Installing the Switch Installing the Switch Installing the switch in a 19-inch rack Mount the front bracket to the device Screw FrontInstallation completed Ready for operation Power-upSequence 421052 for a list of suggested solutions Connecting aRedundant Power Supply PWR LED ColorsSystem Rectifiers No Rectifier Power AvailabilitySwitch 4210 Circuit Breaker and Cable Ratings Redundancy +1 RectifierUsing Power over Ethernet RPS Connection to the SwitchConsole Cable ConnectingRJ-45 Signal Direction DB9 console Terminal, as shown in FigureGND RXD DSR CTS Installing the Switch Managing Your Switch Methods of Managing a Switch User ViewSystem View Configured IP information Setting Up YourRefer to Setting Up Snmp Management on Need toConfiguring IP Manually SnmpAutomatically Configuring the IP Address using Dhcp Automatically Configured IPViewing InformationUser View Login You can manually configure the switch IP information by Manually Configuring IP InformationConnecting to Console Port Connecting the Workstation to the SwitchSetting Up the Switch with IP Information Once you have logged in you are automatically in User ViewPrerequisites Using the Web Interface Using Command Line Interface using Telnet Enter the system-viewcommand and EnterConsole Port Connection Where xxx.xxx.xxx.xxx is the IP address of the switchManagement Network TelnetSetting Up Web Setting Up CommandManagement using Line InterfaceNew community string up to 32 characters Setting Up SnmpString is private String to be removedDefault Users Default UsersPasswords User Default Name Password Access LevelProblem Solving Solving Problems Indicated by LEDsProblems Solving HardwareIP Addressing Solving Communication ProblemsError message indicating that the SFP transceiver is faulty How do you obtain a registered IP Address?Formation Problems Solving FabricProblem Solving PC-AT Serial Cable PIN-OUTSNull Modem Cable RJ-45 to RS-232 25-pinEthernet Port RJ-45 Pin Assignments 10/100 and 1000BASE-T RJ-45 connectionsPin assignments Obtaining Support for Your 3COM Products Telephone Technical Available for purchase from your 3Com resellerContact Us Support and RepairCountry Telephone Number Latin America Telephone Technical Support and Repair US and Canada Telephone Technical Support and RepairSupervisor 3COM Network Management3Com Network DirectorAppendix C 3COM Network Management Integration Kit with 3Com EnterpriseManagement Suite HP OpenViewAppendix C 3COM Network Management Safety Information Important Safety Information’information de Sécurité Importante Wichtige SicherheitsinformationenInformación de Seguridad Importante Appendix D Redundant Power Supply Safety Information Ważne informacje o zabezpieczeniach Importanti Informazioni di SicurezzaAppendix D Redundant Power Supply Safety Information How to identify and resolve radio-TV interference problems Regulatory NoticesAppendix D Redundant Power Supply Safety Information