3Com DUA1770-0AAA04 manual Ports cross-over

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16CHAPTER 1: INTRODUCING THE SUPERSTACK 3 SWITCH 4900 SERIES

100/1000BASE-T and The 100BASE-TX/1000BASE-T and 10BASE-T/100BASE-TX/1000BASE-T 10/100/1000BASE-Tports have RJ-45 connectors and are configured as Auto MDIX

Ports (cross-over).

The default state for these ports is auto-negotiation enabled, where the speed, duplex and flow control modes of a link are automatically detected to provide the highest available bandwidth with the link partner.

Alternatively, auto-negotiation can be disabled. These ports can be manually configured to 10 Mbps half duplex (if supported), 100 Mbps half duplex, 10 Mbps full duplex (if supported), or 100 Mbps full duplex. It is not possible to manually configure a 1000BASE-T link as auto-negotiation is mandatory in the 1000BASE-T standard.

The maximum segment length is 100 m (328 ft) over Category 5 twisted pair cable.

1000BASE-T operation only supports full-duplex mode.

10BASE-T (10 Mbps) is only supported on Switch 4924 and 4950.

1000BASE-SX Ports 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 and the flow control setting can be manually configured.

1000BASE-SX ports do not support auto-negotiation of speed and only support full duplex mode.

GBIC Ports GBIC ports support fiber Gigabit Ethernet short-wave (SX), long-wave (LX) and long-haul (LH70) GBIC transceivers in any combination. This offers you the flexibility of using GBIC transceivers to provide connectivity between the Switch and remote 1000 Mbps workgroups or to create a high capacity aggregated link backbone connection.

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 and the flow control setting can be manually configured.

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Contents SuperStack 3Com Corporation 5400 Bayfront Plaza Santa Clara, California Contents Setting UP for Management PIN-OUTS Page About this Guide Icon Description ConventionsConvention Description Documentation RelatedDocumentation documentation Please include the following information when commenting SuperStack 3 Switch 4900 Series Getting Started Guide3Com recommends that you copy the Docs/referenceguide Directory as a whole to maintain the structure of the filesIntroducing Introducing the Superstack 3 Switch 4900 Series Hardware Features Switches Switch Front View Detail Switch 4900 front viewSwitch 4924 front view Ports cross-over Power/Self Test LED Color Indicates Port Status LEDsModule Status LEDs Unit LEDsSwitch Rear Switch 4900 rear viewPower Socket Switch 4924 rear viewSupported by your Switch Default SettingsSwitch units, it is returned to these defaults Installing the Switch Choosing a Suitable Package ContentsSite Flow through the side panels of the Switch Rack-mountingDesk, or attach it to a wall Have been fittedRepeat steps 2 and 3 for the other side of the Switch Fitting a bracket for rack-mountingInterconnecting two Switch 4900 units Power-up Powering-upSwitch SequencePower System output RJ-45 connector is now a grounded port That contain alignment pins can cause damage to your SwitchYour Switch OptionsSwitch 4950 Gbic OperationApproved Gbic TransceiversFiber SC connector Type 4 Gbic with internal Eeprom fitted Inserting a Gbic Transceiver into a SwitchSwitch 4950 Gbic Operation Installing the Switch Setting UP for Management Setting Up OverviewManual IP Configuration Automatic IP ConfigurationSetting UP for Management Manually Configuring IP Information Pre-requisitesConfiguring the Workstation with IP Information Connecting the Workstation to the SwitchSetting Up the Switch with IP Information Using Command Line Interface via Telnet Example top-level command line interface menu Connecting a workstation to the Switch via the console port 19,200 baud Data bitsSetting Up the Switch with IP Information Viewing Configured IPAutomatically Pre-requisites Viewing IP Information via the Console Port Example top-level command line interface menu Refer to Setting Up Command Line Interface Management on Command Line Network Using TelnetInterface Management CLI Management viaInterface Setting Up WebChoosing a Browser Over the Network Http//xxx.xxx.xxx.xxxDefault Users Setting Up SnmpPasswords User Default Name Password Access Level Security Device User Modify operation on the web interfaceProblem Solving For Technical Support information, see Appendix DSolving Problems Solutions belowPower LED does not light On powering-up, the Power/Self Test LED lights yellowProblems Solving HardwareFan failure warning message is received For further information about RMON, refer to StatusError message indicating that the Gbic transceiver is faulty Unit fails, no Snmp fan failure message is receivedSolving Communication Problems IP AddressingHow do you obtain a registered IP Address? Safety Information Important Safety Information This must be approved for the country where it is usedImportant Safety Information 3CGBIC91 Gbic SX 3CGBIC92 Gbic LX ’information de Sécurité Importante SchkoAppendix a Safety Information 3CGBIC91 Gbic SX 3CGBIC92 Gbic LX Wichtige Sicherheitsinformationen Der Netzstecker muß die Norm CEE 7/7 erfüllen SchukoWichtige Sicherheitsinformationen Appendix a Safety Information Null Modem Cable 9-pin to RS-232 25-pin PC-AT Serial CablePin to 9-pin Connectors Modem CableRJ-45 Pin AssignmentsPin Number 10/100BASE-T 1000BASE-T Appendix B PIN-OUTS Physical Dimensions SafetyPower Consumption Same unless otherwise statedPower Supply Protocols Used for AdministrationHeat Dissipation Standards SupportedServices Online TechnicalUsername anonymous Asia, Pacific Rim From this region, emailEurope, Middle East and Africa From this region, enter the URLAsia, Pacific Rim Europe, Middle East and AfricaCountry Telephone Number Asia, Pacific Rim Country Telephone Number Latin America Index NumbersPasswords Regulatory Notices