Auto Negotiation, Jumbo Frames Support | Dell PC2716, PC2748, PC2708

Auto Negotiation

Auto negotiation allows an Ethernet switch to advertise modes of operation. The auto negotiation function provides the means to exchange information between two Ethernet switches that share a point-to-point link segment, and to automatically configure both Ethernet switches to take maximum advantage of their transmission capabilities. Port advertisement allows the system administrator to configure the port speeds advertised.

Jumbo Frames Support

Jumbo frames are frames with an MTU (Maximum Transmission Unit) size of up to 10K bytes. The Jumbo Frames Support feature, utilizes the network optimally by transporting the same data using less frames.

The main benefits of this facility are reduced transmission overhead and reduced host processing overhead. Jumbo frames are used for server-to-server transfers.

AutoMDI/MDIX Support

The switch automatically detects whether the cable connected to an RJ-45 port is crossed or straight through.

Standard wiring for end stations is Media-Dependent Interface (MDI) and the standard wiring for hubs and switches is known as Media-Dependent Interface with Crossover (MDIX).

Auto MDI/MDIX works on 10/100/1000BASE-T Ethernet ports. This feature is automatically enabled for the entire system and cannot be turned off by the user.

Flow Control Support (IEEE802.3X)

On Full Duplex links (FDX), the flow control mechanism allows the receiving side to signal to the sending side that transmission must be halted temporarily, in order to prevent buffer overflows.

Virtual Cable Testing (VCT)

VCT technology provides the mechanism to detect and report potential cabling issues, such as cable opens and cable shorts on copper links.

Cable analysis is available on Copper Cables (10BASE-T/100BASE-T/1000BASE-T), and is only done when the link is down. When the system initiates a cable-testing operation, upon explicit user action, the following parameters are detected:

•Cable Type and Status

•Cable Length

•Fault-Distance

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Dell PC2716, PC2748, PC2708 Auto Negotiation, Jumbo Frames Support, AutoMDI/MDIX Support, Flow Control Support IEEE802.3X

Contents

User’s Guide October Contents Using the Dell OpenManage Switch Administrator Viewing Statistics Contents System Description IntroductionGigabit Ethernet Ports 24 1-Gigabit Ethernet Ports + 2 SFP Combo ports 16 1-Gigabit Ethernet Ports48 1-Gigabit Ethernet Ports Head of Line Blocking Prevention FeaturesGeneral Features Management Modes Jumbo Frames Support Virtual Cable Testing VCTAuto Negotiation AutoMDI/MDIX Support MAC Address Supported Features Layer 2 Features Vlan Supported Features Class of Service CoS Features Ethernet Switch Management Features Port Default SettingsPage Switch Port Configurations Hardware Description PowerConnect 2708 Back Panel PowerConnect 2724 Back Panel PowerConnect 2748 Back Panel Managed Mode LED Physical DimensionsPower LED LED Definitions Port LEDs Fan LED 2748 only10/100/1000BASE-T Port LEDs Managed Mode Button SFP Port LED 1000BASE-T Cable Requirements Switch Ventilation FanCables, Port Connections, and Pinout Information RJ-45 Connections for 10/100/1000BASE-T Ports SFP Ports Internal Power Supply Connector Power ConnectorsPin Connections for SFP Interfaces Installation Precautions Installing the Dell PowerConnectOverview Site Requirements SafetyUnpacking Handling Static Sensitive Devices Package ContentsUnpacking the Device Mounting the Device Installing the Device Installing the Device in a Rack Installing the Device on a Flat Surface Installing the Device on a Wall Connecting the Device to AC Power Supply Mounting Device on a Wall Connecting the Device to the Network Back Panel Power Connector Viewing Switch Operation Starting and Configuring the Dell PowerConnectInitial Configuration Login Screen Click Apply Changes Page Using the Dell OpenManage Switch Administrator Understanding the Interface Interface Components Description PowerConnect Switch Management Buttons Using the OpenManage Switch Administrator ButtonsInformation Buttons PowerConnect Switch Management Buttons Description Starting the Application Resetting the Device Reset Displaying Configuration on Demand Defining Switch Information Configuring System InformationViewing the Switch Status Defining Switch Information Viewing System IP Address Updating Static IP Address IP Addressing Configuring Dhcp Client Defining Interface Configuration Interface ConfigurationPage Open the Interface Configuration Configuring the InterfaceViewing Jumbo Frames Creating Vlan Membership Enabling Jumbo Frames Removing VLANs Defining Vlan Interface SettingsShowing/Creating VLANs Open the Vlan Membership Updating the Vlan Interface Settings Configuring LAG MembershipOpen the Vlan Interface Settings Open the LAG Aggregation Configuration Adding a Port to a LAG Managing System Files Downloading Files From Server Downloading Files from Server File Download PowerConnect 2748 Switch Configuration Firmware Download Configuration Download Uploading Files Open the File Upload to Server Copying Files Restoring Company Factory Default Settings Click Restore Company Factory Defaults Click Apply Changes Local User Database Assigning Access Level User RightsOpen the Local User Database Adding a User to the Local User Database Integrated Cable Test for Copper CablesDeleting a User from the Local User Database Open the Integrated Cable Test Running Integrated Cable TestClick Test Now Displaying Optical Transceivers Diagnostics Test Results Optical Transceivers DiagnosticsOpen the Optical Transceiver Diagnostics Adding a Port Mirroring Session Port MirroringClick show All Open the Port Mirroring Configuring Storm Control on the PowerConnect Enabling Storm Control Modifying PowerConnect 2708 Storm Control Port Parameters Configuring Storm Control on the PowerConnect 2716/2724 Following describes Storm Control for PowerConnect Modifying PowerConnect 2748 Storm Control Port Parameters Quality of Service QoS Overview Configuring Quality of ServiceVPT Tag Classification Information CoS Services Defining CoS Settings Configuring QoS Settings Configuring the Trust Mode Mapping CoS Values to Queues Mapping a CoS value to a Queue Mapping Dscp Values to QueuesMapping a Dscp value and assigning priority queue Page Viewing Statistics Rmon Statistics Viewing Interface Statistics Open the Rmon Statistics Glossary Broadcast Storm Class of ServiceDuplex Mode Dhcp Client Frame Flow ControlFragment Gigabit Ethernet Jumbo Frames Ingress PortIP Address Layer Mask Managed ModeMAC Layer MulticastPage QoS Startup ConfigurationSwitch Router Unicast TrunkingWildcard Mask