HP Client Bridge M111 Antenna selection, Fast roaming threshold Fast roaming delta threshold

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Working with the M111

Radio configuration

Antenna selection

Select the antenna on which the radio will transmit and receive.

If a single antenna is used, it can be connected to either Main or Aux.

Diversity: In this mode both antennas are used to transmit and receive. The M111 supports both transmit and receive diversity.

Transmit diversity: For a given connection, the M111 always transmits on the antenna it receives. If transmission fails, the M111 automatically switches antennas and retries.

Receive diversity: In 802.11b, the M111 does selection diversity, which means selecting the antenna used to receive based on the SNR calculated while receiving the preamble, on a per frame basis.

For 802.11a and 802.11g, including mixed 802.11b and 802.11g, the receiver switches antennas when the signal quality goes below a certain threshold.

Main antenna: Select this option to use the Main antenna to transmit only.

Auxiliary antenna: Select this option to use the Auxiliary antenna to transmit only.

Fast roaming threshold

Fast roaming delta threshold

These two options function in a similar manner. The only difference is how they determine when roaming will occur. Both options are used when the M111 is mobile and must switch between APs without causing a degradation in wireless service.

Fast roaming enables the M111 to quickly switch between two APs with the same SSID operating on the same channel (frequency). Without fast roaming, the M111 may take as much as 5 seconds to determine that the AP it is connected to is no longer available or out of range. Once this occurs, the M111 scans for a new connection according to the settings on the Wireless > Station profiles page.

When fast roaming is enabled, the M111 continuously monitors the SNR (signal-to-noise ratio) of all wireless beacons with the same SSID and frequency as that of the current connection to determine if it should roam to a new AP. This decision is made as follows:

Fast roaming threshold: The M111 will only switch to a new AP if the SNR of the new AP is greater than the setting for Fast roaming threshold (for the number of beacons specified for Fast roaming threshold count) and the SNR of the current AP is less than the Fast roaming threshold. For example, if set to 10, then the M111 will only switch to a new AP if its SNR is greater than 10 dB and the AP it is currently connected to has an SNR less than 10 dB. Once switched, Roaming persistence (if enabled) takes effect.

Fast roaming delta threshold: If the difference in SNR between the current and new AP is greater than the Fast roaming delta threshold (for the number of beacons specified for Fast roaming threshold count), then the M111 automatically switches over to the new AP. Once switched, Roaming persistence (if enabled) takes effect.

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Contents ProCurve 5400zl Switches HP ProCurve M111 Client Bridge Page HP ProCurve M111 Client Bridge Publication Number Contents Working with the M111 Field descriptions To assign a management address Regulatory information Resetting to factory defaultsViii Introduction Products covered About this guideImportant terms ConventionsExample Description Commands and program listingsIntroducing the M111 Client Bridge Key featuresServicing Safety informationProfessional Installation Required Before contacting support HP ProCurve Networking supportOnline documentation Getting started Overview Scenario 1 Connecting wired devices to a wireless networkDeploying the M111 Configure your computer Configuration procedureConnect to the M111 Select Network DNS PasswordsConfigure a station profile Connect the wired computers to the M111  The printer is configured with a static IP address Configure MAC cloning options Connect the wired device to the M111 Scenario 3 Connecting a serial device to a wireless network Configure the serial connection Getting started Getting started Working with the M111 802.1X certificates Certificate stores Certificate usage Starting the management tool About passwordsManagement tool Manager and Operator accounts Customizing management tool settingsPasswords Security Security policiesAuto-refresh IP address configurationWeb server To configure IP addressing Wireless range Radio configurationRestrict channels to To configure the radioWireless mode Fast roaming threshold Fast roaming delta threshold Antenna selectionFast scan channel delay Scan channel delayFast roaming threshold count Minimum SNR thresholdAdvanced wireless settings Using station profiles to establish a wireless linkTransmit power control RTS thresholdWorking with the M111 General To add or edit a station profileWireless protection Wireless securityKey source EAP methodWorking with the M111 Viewing APs in the neighborhood Quality of serviceEncryption type Ap1certificate or ap2certificateField descriptions Configuring Quality of Service QoSAccess category 802.1p QoS settings in a station profilePriority mechanisms Very-high, high, normal, low priority Differentiated Services DiffServCreating IP QoS profiles DisabledTo define an IP QoS profile Upstream DiffServ taggingSettings Connecting serial devicesProfile name Protocol Start port/ End portTo connect a serial device Serial port connectorIdle timeout Transmit timeoutMode Remote IP addressData bits Drop wireless link when port 1 is connectedParity bit Stop bitsConnection time DNS configurationTx kbytes Rx kbytesDynamically assigned DNS servers DNS switch on server failureOverride dynamically assigned DNS servers ServerEnable the Redirect unsupported traffic to option DNS switch overHandling unsupported traffic To forward unsupported trafficLimitations Cloning the address of a wired deviceIP forwarding Enabling Ethernet MAC cloning Wireless access to the M111 when MAC cloning is activeManagement tool TCP port Setting up management traffic interceptionSnmp agent UDP port Select Management SnmpEnable the Wireless traffic filters option Using filters to restrict wireless trafficSnmp notifications UDP port Remote log UDP portTo assign a management address Assigning a management addressSnmp V3 users AttributesV1/v2c communities Notification receivers Managing certificatesPassword 802.1X Install TLS client certificateInstall 802.1X certificates802.1X Manage TLS client certificates Certificate stores802.1X Trusted CA certificates 802.1X Manage CA certificatesCA certificate import formats Installing a new CA certificateTrusted CA certificate store END Certificate Certificate and private key storeCertificate usage Default installed private key/public key certificate chainsSpecify the Pkcs #12 password About certificate warnings Changing the certificate assigned to a serviceBackup configuration Configuration file managementManual configuration file management Scheduled operations Reset configurationRestore configuration Software updates Performing a scheduled update Performing an immediate software updateSelect Install Enable Scheduled installWorking with the M111 Regulatory information Manufacturers FCC Declaration of Conformity Statement Countries of Operation & Conditions of Use GHz Operation Operation Using 5 GHz Channels in the European Community5470 Supported External AntennasIndoor or outdoor use 1000 124, 128, 132, 136 Antenna Band GHzDGT LPD Low Power Device Statement Resetting to factory defaults How it works Using the Reset buttonUsing the management tool Page Technology for better business outcomes
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