3Com XLPCI manual Option Descriptions, Low-Priority Ratio, Natural Packet Interval

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B-2APPENDIX B: CONFIGURING ADVANCED PACE OPTIONS

Although a video server can support up to 32 connections, a client may want to conference with only four other people at a time. The recommended setting is 16.

Low-Priority Ratio

When PACE support is enabled, high-priority packets are always transmitted before low-priority packets. If a high-priority, PACE-supported application sends out a sufficiently large number of high-priority packets, then low-priority packets from other PACE-supported applications may not be sent.

To prevent this problem, the PACE driver uses a ratio setting to periodically send out a low-priority packet (if a low-priority packet is waiting to be sent). For example, if a value of 100 is entered, one low-priority packet would be sent for every 100 high-priority packets. The recommended setting is 25.

Natural Packet Interval

The PACE driver slightly modifies the Ethernet packet to facilitate communication of packet priorities to interconnect devices (repeaters, switches, and the like). Consequently, connection problems may result when these modified packets are sent out for long periods, during which no low-priority packets are sent. To get around this problem, the PACE driver can be configured to periodically send out an unaltered, natural packet. The recommended setting is 180 (seconds).

Option Descriptions

The following advanced options can be enabled or disabled to regulate packets.

Disable Switch Packet Prioritization

This option disables modification of Ethernet packets used for prioritization of multimedia traffic within 3Com switch products. For example, disabling switch packet prioritization can sometimes prevent multimedia-connection failures between a PACE-enabled workstation and a non-PACE workstation.

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Contents EtherLink XL PCI 10 Mbps Network Interface Cards User Guide 3Com Corporation 5400 Bayfront Plaza Santa Clara, California Contents Changing Configuration Settings Troubleshooting Network Connection Problems Page Figures Tables Finding Specific Information in This Guide About this GuideIf you are looking for Turn to Convention Description ConventionsIcon Description Bold-face typeInstalling Network Interface CardNIC Model Cable Connector Transceiver Network Segment Preparing for InstallationMaximum Inserting the NIC 2Installing the 3C900B NIC Connecting to the Network RJ-45 Port4Connecting to the BNC Port on the 3C900B-COMBO NIC BNC Port5Connecting to the AUI Port on the 3C900B-COMBO NIC AUI PortState Interpreting the Link LEDMeaning RJ-45 OffNetwork Driver WindowsWindows 95 Build Specified fields of the Identification tab screen, enterClick Close Enter your user name and password, and then click OKClick Yes Insert EtherDisk diskette 2 in drive a and click Next Windows 95 OSR2Click Finish Windows 95 prompts you to reboot Confirming Installation Windows NTClick the Adapters tab Windows NTClick Add 8CHAPTER 2 Installing the Network Driver Click Close Click OK in the Network Settings window Click Add AdapterNovell NetWare Client Driver Running AutoLink SoftwareNovell NetWare Server Driver NetWareNetWare 4.10 Save and exit the file, and then reboot the serverMultiple NICs 3c90xcfg.exe Supported Network Drivers Network Text File Name Network Driver Name Operating SystemTroubleshooting Running Diagnostic ProgramsRunning NIC Tests 3Com DOS Diagnostic Program3Com NIC Diagnostics Program Double-click the 3Com icon in the Windows system trayClick the Diagnostics tab 13Com NIC Diagnostics General ScreenClick Start Running the Echo TestOn the responding PC On both PCsOn the sending PC Close all open windows when the Echo test is finished 3Com Support Services 63Com NIC Diagnostics Support ScreenAccessing the Help System Click the Support tabRemoving NIC Software Windows 95 and Windows NTFrequently Asked Questions QuestionAnswerQuestion Answer Make sure that your IP protocol does not compute the CRC Fast IP is designed to bypass the router, particularly where Page Changing Configuration Settings Option Default Setting Available SettingsRunning the 3Com NIC Diagnostics Program Using the DOS Configuration ProgramDisplaying Configuration Settings Running the 3Com NIC Diagnostics Program Changing Configuration Settings 33Com NIC Diagnostics Properties Screen43Com DynamicAccess Setup Screen Enabling Pace SupportPage Specifications SpecificationsCabling Requirements 10BASE-T Operation Twisted-Pair CableCategory Use RJ-45 Connector Pin Assignments 10BASE-T SpecificationsPage Fifo Packet Threshold Operational SettingsConcurrent UDP Streams Low-Priority Ratio Disable Switch Packet PrioritizationOption Descriptions Natural Packet IntervalChanging Operational Settings Disable Receive Packet BufferingChanging Ranges and Protocols Eliminating Potential Causes of Problems Troubleshooting Network Connection ProblemsConnect a straight-through cable from the PC to the hub Troubleshooting Hubs with Crossover Cable Crossover cableOnline Technical Services Support from Your Network SupplierAccess by Analog Modem 3Com Bulletin Board ServiceWorld Wide Web Site 408 654 3ComFacts Automated Fax ServiceAccess by Digital Modem 408 727Page Index NumbersLANSRV.TXT 10BASE-TA-3 Page 3Com Corporation Limited Warranty FCC Class B Statement FCC Declaration of Conformity