Problem Retransmissions are excessive | RadioLAN Campus BridgeLINK

Problem: Radio Range seems less than it should be.

Check the placement of the directional antenna. Generally, the higher on the wall it is placed, the better the signal pattern will be. If this link has been working for some time, inspect the antenna to see if it has been moved out of alignment. Check the line of site between directional antennas to verify that no new construction or tree growth has occurred, blocking the directional antenna link

If the problem persists and you have access to another CRM, try replacing the CRM. If this makes a difference, it is possible the CRM may have become damaged, reducing its effectiveness. Contact your distributor for assistance.

Problem: Retransmissions are excessive.

Verify that you selected and saved the correct Estimated Distance on the ANTENNA AIMING page (see Aiming the Directional Antennas on page 33). This also sets internal CPU transmission timers. Using an incorrect setting can cause retransmissions, which reduce the link’s efficiency and speed.

890-007 Rev. A 01/28/99

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© 1999 RadioLAN, Inc.

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RadioLAN Campus BridgeLINK manual Problem Radio Range seems less than it should be, Problem Retransmissions are excessive

Contents

Wireless Local Area Network Campus BridgeLINK User Guide FCC Remarks Disclaimer Manual Conventions Trademark Disclosures Installing the CPU Using the Campus BridgeLINK Manager Recording Important System Information Getting Technical Support 120 890-007 Rev. a 01/28/99 Introduction 890-007 Rev. a 01/28/99 Campus BridgeLINK Processor Unit CPU LED IndicatorsCampus BridgeLINK System MDI/MDI-X Switch Local Port Jack 10BaseT LED Indicators10BaseT Port Jack Mounting Bracket CRM Port CRM Companion Radio Module Companion Radio Module CRM Directional Antenna Power Transformer Low-Loss RF Cable Antenna Cable Typical Campus BridgeLINK Application Typical Campus BridgeLINK Application Linking Networks in Two Locations Determining the Distance between Buildings Quick Configuration Initial IP Address Setup Temporarily Connect the CPU Configuration Disk Using the IP Assign Utility to Assign the CPU’s IP Address Tools You Will Need Installing the CPU Locating the CPU Locating the CPU Closely to Network, Power, and the Antenna Mounting the CPU Connecting the Antenna Cable to CRM Inserting the CRM into the Bracket Marking Screw Locations Connecting the Network Acceptable Ground Source Grounding Considerations Attaching the Directional to a Typical Mount Brief Word About Safety Minimum Height from Ground Choosing the Best Mounting Height Tools You Will Need Adjusting the Antenna’s DirectionSighting Each Campus BridgeLINK Antenna Eyeball the Direction Sighting Procedure Power Connection Sequence Apply Power to the CPU Dual Remote Management Html and Snmp Adding Security to the Wireless NetworkLocal Management Browser Requirements System Requirements CPU Web Site Using the Campus BridgeLINK Manager Logging onto Campus BridgeLINK Manager Browsing the Network for the CPU Enter User Name Enter PasswordProduct ID Campus BridgeLINK Manager Main Menu Campus BridgeLINK Manager Site Layout Campus BridgeLINK Manager Main Save Distance Parameter button Aiming the Directional Antennas∙ Explicit Address check box Start button Starting and Stopping the Test Setting the Frame SizeSetting the Estimated Distance between Antennas Selecting the Distant CPU’s Address User Logon Name Fields Setting Up Security Features Setting Up Snmp Capabilities Reload Administration ParametersUse Default System Location System NameSystem Contact IP Parameters IP Parameters Subnet Mask Default Gateway IP AddressIP Address Acquire System IP Only DisabledDhcp Support Dhcp Server IP Address Acquire IP and Download System SoftwareAcquire IP, Download System Software and Save it Cold Start User AuthenticationAuthentication Trap check Snmp Parameters Write Community Enable Authentication TrapRead Community Configure Snmp Host Configuring Snmp Managers for the CPU Directing the System Log to Manager Stations Setting Access Rights for Snmp ManagersDirecting Traps to Manager Stations Point-to-Point Mode Setting the CPU’s Mode of Operation Encryption Key and Retype Encryption Key Fields ∙ Encryption Key field Data Encryption Enabled Check BoxSecuring the CPU with Data Encryption Bridging the Link and 10BaseT Networks Getting to the Port Parameters Menu MAC Address Filter 10BaseT Port Parameters Block IP Packets Edit Button Block NetBEUI Packets Block NetBIOS PacketsBlock IPX Packets Radio Port Parameters Subnet ID Port Name Console Parameters Setting the Baud Rate for the Local Port Managing Packet Flow Through the CPU MAC Address Source/Dest Mask Bytes Adding MAC Filters Accept/Reject Deleting MAC Filters Modifying MAC Filters Bridging Networks Spanning Tree Parameters Bridge Priority 0-65,535 Hello Time Forward Delay Time Max. Age Time Port Path Cost 1-65,535 Port Priority Interrogating the System for Performance Information 10BaseT Port Statistics Checking 10BaseT Port Statistics Total Packets Transmitted Total Error PacketsCRC Error Packets Collision Error Packets Runt Packets Overrun Packets Radio Port Statistics Checking Radio Port Wireless Link Statistics Average Transmit Rate Packets/Sec Packet Transmission Average Receive Rate Packets/Sec Total RetransmissionPacket Reception Upgrading System Software Software Upgrade from file System Software Filename Download Button Tftp Server IP Address Configuration Changes Saving or Rejecting Configuration Setting Changes Reset Configuration to Factory Default Save All Changes and ResetReload Last Saved Configuration Reset Resetting the CPU Recording Important System Information System Name Default Gateway IP AddressBoot Software Version Product Name 890-007 Rev. a 01/28/99 Time Sec Error MessageViewing the System Log Task Managing the CPU Locally Serial Port Adapter Cable Pin-outs Signal Description DB-9F RJ11 Hot Keys CPU Local Management Logon Menu Logging onto the CPU Configuration Screen Serial Number Node Discovery Using the Main MenuSystem Features System Status System ConfigurationDiagnostics System Statistics Administration Parameters Working with the System Configuration Menu Port Parameters IP ParametersSpanning Tree Parameters Snmp Parameters Software Upgrade Parameters Selecting this item Data Encryption Access SecurityConfiguration Changes System Operation Mode User Logon Name Configuration Manager Menu ItemsUser Password Menu Name Menu Item Refer to Subnet Mask Menu Name Menu Item Refer to System ContactSystem Location IP Address Dhcp Server IP Address Dhcp Server IP Address on Menu Name Menu Item Refer to Default Gateway IPDhcp Operation Mode Address Right Managing Host AccessEnable Trap Receiving Managing Host IP Address Add this Managing Host Point-to-Point ModeReceiving Menu Data Encryption Enabled Check10BaseT Port Parameters Menu Radio Port Parameters Block IP Packets Block NetBIOS PacketsBlock MAC Packets Edit MAC Filters Address Filtering Packet When SatisfiedList all Filters Configured Source or Destination Port Path Cost 1-65,535 Forward Delay TimeMax. Age Time Port Priority Tftp Server IP Address Tftp Server IP Address on Download Mode Changes Save All ConfigurationMenu Name Menu Item Refer to System Software Filename Perform Download Ping Frame Size ConfigurationsReset All Configuration Ping Destination System Information Menu Name Menu Item Refer to BestWorst Perform Ping Problem No traffic for anyone Indicators Problem Retransmissions are excessive Problem Radio Range seems less than it should be Glossary Access Point Agent Client Station Dhcp Server Domain Gateway IP Address MAC Address Manager Routing Subnet Mask NodePackets 10BaseT Port LEDs IndicatorsPower LED Fault LED Status LEDs MDI/MDI-X Switch 10BaseT connector Connectors Serial Port Connector Standards Support Electrical SpecificationsNetwork Protocol Weight Physical SpecificationsEnvironmental Specifications Dimensions Electromagnetic Emissions Safety Agency Approvals Getting Technical Support Index 890-007 Rev. a 01/28/99 890-007 Rev. a 01/28/99 890-007 Rev. a 01/28/99 890-007 Rev. a 01/28/99 890-007 Rev. a 01/28/99 890-007 Rev. a 01/28/99 890-007 Rev. a 01/28/99 890-007 Rev. a 01/28/99 890-007 Rev. a 01/28/99 890-007 Rev. a 01/28/99 890-007 Rev. a 01/28/99 890-007 Rev. a 01/28/99 890-007 Rev. a 01/28/99 890-007 Rev. a 01/28/99 RadioLAN