3Com 3CR16708-91, 3CR16709-91 manual Cross-over Cable Straight-through Cable

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28CHAPTER 2: INSTALLING THE SWITCH

For further information about Power Over Ethernet, refer to “Power Management and Control” in the Switch Implementation Guide supplied on the CD-ROM that accompanies your Switch. Power over Ethernet management is available using the web interface or the command line interface (CLI).

Choosing the Correct All of the RJ-45 ports on the Switch are Auto-MDIX, that is they have a RJ-45 Cables cross-over capability. The port can automatically detect whether it needs

to operate in MDI or MDIX mode. Therefore you can make a connection to a port with a straight-through (MDI) or a cross-over cable (MDIX).

The Auto-MDIX feature only operates when auto-negotiation is enabled.

If auto-negotiation is disabled, all the Switch ports are configured as MDIX (cross-over). If you want to make a connection to another MDIX port, you need a cross-overcable. Many ports on workstations and servers are configured as MDI (straight-through). If you want to make a connection to an MDI port, you need to use a standard straight-throughcable. See Table 7.

WARNING: The Switch supports Power over Ethernet on rear ports 1, 2, 5 and 6. These ports should only be used for Ethernet wiring within the same building. The SFP and 100BASE-FX ports of the Switch 9 FX can be used for Ethernet wiring between buildings.

3Com recommends that you use Category 5e twisted pair cable — the maximum segment length for this type of cable is 100 m (328 ft).

Table 7 Cables required to connect the Switch to other devices if auto-negotiation is disabled

Cross-over Cable

Straight-through Cable

Switch to Switch (MDIX to MDIX)

Switch to Hub (MDIX to MDIX)

Switch to PC (NIC) (MDIX to MDI)

✓ ✕

✓ ✕

✕✓

CAUTION: If you want to install the Switch using a Category 5e or Category 6 cable, 3Com recommends that you briefly connect the cable

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Contents 3CR16708-91 3CR16709-91 3Com Corporation Campus Drive Marlborough, MA USA United States Government LegendContents Setting UP for Management Problem Solving OutsPage About this Guide Icon Description ConventionsConvention Description Documentation RelatedDocumentation Comments Pddtechpubscomments@3com.comIntroducing Hardware Features Switch Switch Front View Detail Alert LED Power LED Port Status Leds PoE Status Leds100BASE-FX Port Status LEDs Switch 9 FX only SFP Module Status LED Switch 9 FX onlyColor Indicates 10BASE-T/100BASE-TX Port Status LEDs LED Alert LEDSwitch Rear View Detail Switch 9 rear viewSwitch Rear View Detail Page Default Settings shows the default settings for the Switch Page Installing the Switch Choosing a Suitable Package ContentsSite Air temperature around the Switch does not exceed 50 C 122 F Wall-mounting UpwardsMounting Instructions for Cement Walls Instructions for Wood Walls Make two holes 150 mm 5.9 in. apartPower and Alert LED colors Color StatePower-up Sequence Cross-over Cable Straight-through Cable SFP Operation Installing the Switch Inserting a SFP Transceiver Installing the Switch Setting UP for Management Setting Up Configure IP information manually for your Switch or viewAutomatically configured IP information OverviewManual IP Configuration Automatic IP ConfigurationSetting UP for Management Manually Configuring IP Information Pre-requisitesConnecting the Workstation to the Switch Connecting a workstation to the Switch via the console portSetting Up the Switch with IP Information Example top-level command line interface menuViewing Configured IPAutomatically Viewing Automatically Configured IP Information Viewing IP Information via the Console Port Methods of Managing a Switch Refer to Setting Up Command Line Interface Management on Refer to Setting Up Web Interface Management onCommand Line Network Using TelnetInterface Management CLI Management viaInterface Setting Up WebChoosing a Browser Setting Up Snmp Management Protocol Snmp can manage a Switch ifOver the Network Management workstationDefault Users User Default Name Password Access LevelDefault Users and Passwords Setting UP for Management Problem Solving Solving Problems Indicated by LEDsRefer to the list of suggested solutions below ProblemsSolving Hardware IP Addressing Solving Communication ProblemsHow do you obtain a registered IP Address? Solving Software Upgrade Problems Problem Solving Safety Information Power Cord Set Japan Important Safety Information This must be approved for the country where it is usedImportant Safety Information ’information de Sécurité Importante Schko’information de Sécurité Importante Wichtige Sicherheitsinformationen Vorsicht EuropeInformación de seguridad importante Schuko Dispositivo Láser DE Clase Importanti Informazioni di Sicurezza CSAAvvertenza porte a fibre ottiche Protezione degli occhi Appendix a Safety Information RJ-45 Pin Signal DB-9 Pin Direction RJ-45 to RS-232Adapter Cable Panel. The pinout is shown belowConnectors RJ-45 PinAssignments Pin NumberOfficeConnect Managed Switch 9 and Switch 9 FX Standards Supported Protocols Used for AdministrationTerminal Emulation Services Register YourProduct PurchaseAccess Software TroubleshootOnline DownloadsContact Us Latin America Telephone Technical Support and Repair Country Telephone NumberUS and Canada Telephone Technical Support and Repair Index Snmp Regulatory Notices