1000BASE-T, Auto-negotiation, Bandwidth | 3Com 3C16491 specification

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.

Image 87

3Com 3C16491 manual 1000BASE-T, Auto-negotiation, Bandwidth

Contents

3C16491 Baseline Switch PWR Plus 3Com Corporation 350 Campus Drive Marlborough MA USA Contents Snmp Regulatory Notices Glossary Index Page Conventions About this Guide Product Registration Documentation Comments Autonegotiating 10/100 Mbps Ports Overview of the Baseline SwitchFeatures and Capabilities Autosensing of MDI/MDIX Connections Front Panel Physical FeaturesPower-over-Ethernet Capability Gigabit Combo Ports RJ-45/SFP Gigabit Combo Ports RJ-45/SFP Link/Activity Status LEDs Rear Panel Power LED Package Contents Before You Begin Positioning the Switch Rack-Mounting or Free-Standing Using the Mounting Kit Placing Units On Top of Each Other Montagesatz Anweisungen Checking for Correct Operation Supplying Power to the Switch Using SFP Tranceivers Approved SFP TransceiversInserting an SFP Transceiver Inserting an SFP Transceiver Removing an SFP Transceiver Performing Spot Checks Installing the Switch Running the Discovery Application Requirements for Accessing the Web Interface Welcome screen of Discovery appears Discovered Devices Screen Logging On to the Web Interface Menu Navigating the Web Interface Lists the available items on the menu Menu Item Port Status Buttons Accessing the Interface Without Using Discovery Dhcp Assigned IP AddressManually Assigned Static IP Address Device Summary Information Configuration Overview Polling Interval Device View Color Key Administration SettingsModifying the IP Address Settings Automatic IP Configuration To set the IP address for the Switch IP Setup Restore Configuration Backup Configuration Upgrade Screen Firmware Upgrade Initialize Reboot User Summary System Access Modify User Create User Remove User System Time Setup SummarySnmp Add Snmp Remove Configuring VLANs Vlan Modify Port Modify Vlan Modify Port Screen Rename Remove Port DetailVlan Detail Forwarding Tagged/Untagged Frames Sample Vlan Configurations Setting Up Vlan Across Two Switches Setting Up Two VLANs on the Same Switch Spanning Tree Tagged Vlan Configuration Spanning Tree Screen Igmp Snooping Igmp QueryBroadcast Storm PoE Broadcast Storm Setup Screen Administration Configuring Port Settings Detail Port Administration Summary Screen Speed/Duplex for 1000 Mbps Connections Port Administration Setup Screen Guidelines for Creating Trunks Link Aggregation Link Aggregation Summary Screen Create Link Aggregation Modify Screen Modify Spanning Tree per Port Spanning Tree Summary Screen Port Mirroring Spanning Tree Setup Screen Statistics Port Mirroring Setup Screen QoS VoIP Summary Screen QoS VoIP Traffic Settings QoS VoIP Setup Screen Port Setup OUI Add OUI Summary Radius Client Security Radius Client Detail Screen Configure 802.1X Summary Screen 802.1X Settings 802.1X Detail Screen Address Table Monitoring Address Table Screen Cable Diagnostics Cable Diagnostic Screen Diagnostics Resetting to Factory Defaults Troubleshooting Forgotten Password Solving LED IssuesForgotten Static IP Address Link/Activity LED is on, but network performance is poor Fiber cable is connected, but the Module Active LED is off All ports appear to show continual activity If the Problem Persists Purchase Value-Added Services Troubleshoot Online Access Software DownloadsRegister Your Product Contact Us Telephone Technical Support and Repair Country Telephone Number Latsupportanc@3com.com Electrical Related StandardsEnvironmental Physical Appendix B Technical Information Important Safety Information Safety Information Appendix C Safety Information Regulatory Notices Page 1000BASE-T Auto-negotiationBandwidth Category 6 Cables Category 3 CablesCategory 5 Cables Category 5e Cables Ieee 802.1Q Full DuplexHalf Duplex Ieee 802.1D Network LayerLink Aggregation MAC Address Subnet Mask SwitchServer Subnet Address Vlan Numbers Index Index