Harmony House 802.11a manual Guidelines for Roaming

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Wireless Topologies

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As the mobile client seamlessly switches from cell to cell, its network connectivity is preserved. The user can move freely between the Harmony 802.11a Access Points on the network. When the roaming client leaves the transmission range of one 802.11a Access Point, the software automatically polls the other 802.11a Access Point(s) in the same Extended Service Set (ESS) to continue the network connection.

Note: The Access Points’ cells must overlap to ensure that there are no gaps in cov- erage so that the roaming client will always have a connection available.

See Figure 3 for an example of a roaming Infrastructure network that includes a Harmony Access Point Controller. A network that has one or more Harmony Access Point Controllers provides additional security and management features, such as AP Groups and the Harmony Security Protocol. In addition, you can install Harmony 802.11a Access Points on different IP subnets from the AP Controller, allowing mobile users to roam across routers. For more information on the Harmony AP Controller and Access Points, refer to the Harmony Access Point Controller User’s Guide.

Guidelines for Roaming

A Harmony 802.11a client can only roam between 802.11a Access Points. An 802.11a client cannot communicate with Harmony 802.11b or OpenAir Access Points.

All 802.11a Access Points must have the same SSID.

All workstations with Harmony 802.11a client adapters installed must use either an SSID of “any” or the same SSID as the Access Points that they will roam between.

All 802.11a Access Points and clients must have the same security settings to communicate.

The Access Points’ cells must overlap to ensure that there are no gaps in coverage and to ensure that the roaming client will always have a connection available.

Access Points in the same vicinity should each use a unique, independent Chan- nel to avoid potential interference.

Access Points that use the same Channel should be installed as far away from each other as possible to reduce potential interference.

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Contents Harmony 802.11a Network Adapter Users GuideFCC Warning Declaration of Conformity That the following harmonized standards have been appliedFor Indoor Use Only Table of Contents Index Chapter IntroductionHarmony Family Harmony 8150 802.11a PCI Card Product PackageHarmony 8450 802.11a CardBus Card System Requirements Overview of Country-Specific Features Regulatory Warnings InstallationPre-installation Considerations FCC GuidelinesWindows ME and Windows 98 SE Installation CD Requirement Industry Canada GuidelinesWindows NT Laptops Require a Plug-and-Play Utility 802.11a CardBus CardInstallation Instructions Windows 98SE/ME/2000/XPPage Page Windows NT Page Harmony 802.11a PCI Card users Follow these steps Related Topics Upgrading to Version Wireless Topologies Ad HocConnecting to a Single AP InfrastructureRoaming Between Multiple APs RoamingGuidelines for Roaming Configuration Parameters Ieee 802.11a SpecificationNetwork Mode 802.11a Software ParametersRoaming Power Saving Mode2X Mode For Europe ChannelFor United States and Canada For JapanFor Singapore Send RateFragmentation WEP Encryption and Authentication Security OptionsHarmony Security Protocol WEP Keys802.1x Harmony Security Protocol GuidelinesConfiguration Parameters Harmony Utility Status Monitor IconConfiguration Utility Association InformationHarmony Utility Station Configuration Harmony Utility Harmony Utility WEP for Authentication and Encryption SecurityPage Read Key File Format Harmony Security Protocol Page Page Page 802.1x Click the Authentication tab Click the Wireless Networks tabNetwork Traffic Statistics Send Receive 802.11a Networks Snoop Tool Packet Transmission Success Rate Version Information Common Installation Problems TroubleshootingHow to Obtain Help with Your LAN Installation Windows 98/ME/2000/XP Troubleshooting Adapter Inserted Before Running the Installation Program802.11a Network Adapter Not Installed Properly Adapter Not Listed in Device ManagerWindows ME/98 SE Configuring Networking Clients and ProtocolsWindows XP/2000 Uninstalling a Harmony 802.11a Network Adapter Windows NTWindows NT computers RangeWindows 98/ME computers Windows 2000 computersCardBus Card LED Indicators Common Technical Support Questions Access Point is out of range box and click LogonPassword so the Harmony logon General Technical SpecificationsTechnical Specifications Network InformationPhysical RadioEnvironmental Parameters SsidAppendix B Technical Support and TrainingIndex Infrastructure Network Mode Ssid Throughput Topologies