3Com 2426-PWR, 2226-SFP, 2250-SFP manual 1000BASE-T, Auto-negotiation, Bandwidth

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GLOSSARY

10BASE-T

The IEEE specification for 10 Mbps Ethernet over Category 3, 4 or 5 twisted pair cable.

100BASE-TX

The IEEE specification for 100 Mbps Fast Ethernet over Category 5 twisted-pair cable.

1000BASE-LX

IEEE 802.3z specification for Gigabit Ethernet over 9/125 micron core single-mode fiber cable.

1000BASE-SX

IEEE 802.3z specification for Gigabit Ethernet over two strands of 50/125 or 62.5/125 micron core multimode fiber cable.

1000BASE-T

IEEE 802.3ab specification for Gigabit Ethernet over

100-ohm Category 5, 5e or 6 twisted-pair cable (using all four wire pairs).

Auto-negotiation

Auto-negotiation is where two devices sharing a link, automatically configure to use the best common speed. The order of preference (best first) is: 1000BASE-T full duplex, 100BASE-TX full duplex, 100BASE-TX half duplex, 10BASE-T full duplex, and 10BASE-T half duplex. Auto-negotiation is defined in the IEEE 802.3 standard for Ethernet and is an operation that takes place in a few milliseconds. Auto-negotiation must be enabled for the 1000BASE-T ports to operate at 1000 Mbps, full duplex.

Bandwidth

The information capacity, measured in bits per second, that a channel can transmit. The bandwidth of Ethernet is 10 Mbps, the bandwidth of Fast Ethernet is 100 Mbps and Gigabit Ethernet is 1000 Mbps.

BPDU

Bridge Protocol Data Unit. A type of information packet that ensures that data is efficiently exchanged between Switches in a LAN. BPDU messages detect loops in a network, and remove them by shutting down the bridge causing the loop.

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Contents Installation and User Guide 3Com Corporation 350 Campus Drive Marlborough MA Contents Snmp 3COM CLI Reference Guide Page Conventions About this GuideProduct Registration Documentation CommentsFeatures and Capabilities Overview of the Baseline SwitchAutosensing of MDI/MDIX Connections Autonegotiating 10/100 Mbps PortsGigabit Combo Ports RJ-45/SFP Physical FeaturesPower-over-Ethernet Capability RJ-45 10/100 Ports Front PanelGigabit Combo Ports RJ-45/SFP 10/100BASE-TX Link/Activity Status LEDs SFP Mode Rear Panel Power LEDPackage Contents Important Safety Information Installing the SwitchImportante Avviso di Sicurezza Positioning the SwitchRack-Mounting or Free-Standing Using the Mounting KitPlacing Units On Top of Each Other Supplying Power to the SwitchMontagesatz Anweisungen Status Meaning Checking for Correct OperationInserting an SFP Transceiver Using SFP TranceiversApproved SFP Transceivers Removing an SFP Transceiver Performing Spot ChecksRefer to Troubleshooting on Using the Console Command Line Interface CLI Requirements for Accessing the Web InterfaceCLI Summary with Default IP Address CLI Summary with Assigned IP Address Logging On to the Web InterfaceMenu Navigating the Web InterfaceMenu Item Description Snmp Port Status Buttons3Com Switch Detect Welcome Screen Running the 3Com Switch Detect Application3Com Switch Detect Search Screen Connecting to the WEB Interface Device Summary Information Configuration OverviewPolling Interval Device ViewModifying the IP Address Settings Administration SettingsAutomatic IP Configuration Color KeyBackup Configuration IP SetupFirmware Upgrade Restore ConfigurationSystem Access ResetReboot Initialize, keep IP settingCreate User User SummaryRemove User Modify UserSystem Time SetupSystem Name Snmp Remove Configuring VLANsSnmp Add Vlan Modify Vlan Setup ScreenRename Modify PortPort Detail RemoveVlan Detail Sample Vlan ConfigurationsForwarding Tagged/Untagged Frames Setting Up Vlan Across Two Switches Setting Up Two VLANs on the Same SwitchSpanning Tree Tagged Vlan ConfigurationSpanning Tree Summary Screen SummarySpanning Tree Setup Screen Port SetupIgmp Snooping & Query Spanning Tree Port Setup ScreenBroadcast Storm Summary Screen Broadcast StormModify QoS VoIP Traffic SettingsQoS VoIP Setup Screen OUI Add OUI SummaryQoS OUI Modify Screen PoE 3CBLSF26-PWR onlyAdministration Configuring Port SettingsDetail Port Administration Summary ScreenSpeed/Duplex for 1000 Mbps Connections Port Administration Setup ScreenGuidelines for Creating Trunks Link AggregationLink Aggregation Summary Screen CreateUse the Remove tab to delete a link aggregation group Radius Client SecurityStatistics Configure 802.1X Settings802.1X Summary Screen Address Table MonitoringPort Summary Port MirroringUse the Setup tab to create a port mirror session Cable Diagnostic Summary Screen Cable DiagnosticsCable Diagnostic Screen DiagnosticsConfiguring the Switch from the WEB Interface Resetting to Factory Defaults TroubleshootingFiber cable is connected, but the Module Active LED is off Solving LED IssuesForgotten Static IP Address All ports appear to show continual activity If the Problem PersistsLink/Activity LED is on, but network performance is poor Troubleshooting Register Your Product Purchase Value-Added ServicesTroubleshoot Online Access Software Downloads Contact Us Telephone Technical Support and RepairCountry Telephone Number Latsupportanc@3com.com Environmental 3CBLSF26 Related StandardsPhysical Electrical3CBLSF26PWR Related Standards Environmental 3CBLSF50 Related StandardsPhysical ElectricalAppendix B Technical Information Console Cable PIN-OUTSModem Cable Null Modem CablePC-AT Serial Cable Pin Number 10/100 1000 Ethernet Port RJ-45 Pin AssignmentsAppendix C PIN-OUTS Logging on to the CLI Getting Started with the Command Line InterfaceConsole Port Concurrent CLI Sessions CLI CommandsAutomatic Logout Syntax Default Configuration Parameters Ping255.255.255.0 IpSetupUpgrade Initialize Following example resets the Switch to factory defaultsLogout PasswordRegulatory Notices 100 Bandwidth 1000BASE-TAuto-negotiation Category 5 Cables Category 3 CablesCategory 5e Cables Category 6 CablesHalf Duplex Full DuplexIeee 802.1D Ieee 802.1QLayer Power over EthernetLink Aggregation MAC AddressServer SwitchSubnet Address Subnet MaskVlan Numbers IndexIndex