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HP MSM-802.11n Dual Radio Access Point Series - Radio Configuration

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To define configuration settings for a radio, select Wireless , Radio(s) . This opens the Radio(s) configuration page. The contents of this page will vary depending on the product. The following screen shots show the Radio(s) configuration page for each access point type.

(For all screen shots: Operating mode is set to Access Point and Local Mesh , and Advanced wireless settings has been expanded to show the complete set of configurable settings.)

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Configuration

E-MSM466

E-MSM460 and E-MSM430

MSM422

MSM410

MSM335 (radio 1 and 2)

MSM335 (radio 3)

MSM320

MSM310

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Radio configuration parameters

This section provides definitions for all configuration parameters that are present on all products.

Regulatory domain

Indicates the geographical region in which the access point is operating.

Operating mode

Select the operating mode for the radio. Available options are:

  • Access point and Local mesh : Standard operating mode provides support for all wireless functions. (Not supported on radio 3 on the MSM335).

  • Access point only : Only provides access point functionality, local mesh links cannot be created. (Not supported on radio 3 on the MSM335).

  • Local mesh only : Only provides local mesh functionality. Wireless client stations cannot connect.

  • Monitor : Disables access point and local mesh functions. Use this option for continuous scanning across all channels in all wireless modes. See the results of the scans by selecting Wireless , Neighborhood . This mode also enables 802.11 traffic to be traced using the Tools , Network trace feature.

  • Sensor : Enables RF sensor functionality on the radio. HP access points are smart access points, and do not forward broadcast packets when no client stations are connected. Therefore, the RF sensor function will not be able to detect these access points unless they have at least one connected wireless client station. This feature requires that the appropriate license is installed on the access points.

The following table shows the operating modes supported for each product.

The following table shows all radio parameters that are configurable for each operating mode.

Certain parameters are not supported on all radios. Refer to the parameter descriptions that follow for details.

Wireless mode

Supported wireless modes are determined by the regulations of the country in which the access point is operating, and are controlled by the country setting on the access point.

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E-MSM430, E-MSM460, and E-MSM466

These products support the following wireless modes.

  • 802.11n/a

    Supported on
    Radio 1, Radio 2
    Frequency band
    5 GHz
    Data rates
    For 802.11n clients : Up to 450 Mb/s on the E-MSM466 and E-MSM460, and up to 300 Mb/s on the E-MSM430.
    For 802.11a clients : Up to 54 Mb/s on the E-MSM430, EMSM460, and E-MSM466.

    When operating in this mode, the access point allows both 802.11n and legacy 802.11a clients to associate. The access point advertises protection in the beacon when legacy clients are associated or operating on the same channel. This alerts associated 802.11n clients to use protection when transmitting. The access point also uses protection when necessary when sending 802.11n data. The type of protection is configurable by setting the Tx protection parameter.

  • 802.11n/b/g

    Supported on
    Radio 2
    Frequency band
    2.4 GHz
    Data rates
    For 802.11n clients : Up to 450 Mb/s on the E-MSM466 and E-MSM460 and up to 300 Mb/s on the E-MSM430. These values are achievable when using a 40 MHz channel width, which is not recommended in the 2.4 GHz frequency band.
    For 802.11g clients : Up to 54 Mb/s on the E-MSM430, E-MSM460, and E-MSM466.
    For 802.11b clients : Up to 11 Mb/s on the E-MSM430, E-MSM460, and E-MSM466.

    When operating in this mode, the access point allows both 802.11n and legacy 802.11b/g clients to associate. The access point advertises protection in the beacon when legacy clients are associated or operating on the same channel. This alerts associated 802.11n clients to use protection when transmitting. The access point also uses protection when necessary when sending 802.11n data. The type of protection is configurable by setting the Tx protection parameter.

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MSM310, MSM320, MSM335, MSM410, MSM422

These products support the following wireless modes.

  • 802.11n (5 GHz)

    Supported on
    MSM410, MSM422 (radio 1)
    Frequency band
    5 GHz
    Data rates
    Up to 300 Mb/s

    HP refers to this mode as Pure 802.11n. When operating in this mode, the access point does not permit non-802.11n clients to associate. Legacy clients can see the access point, and may attempt to associate, but they will be rejected. The access point makes this determination based on the supported rates that the client presents during its association request. If the rates do not include any of the 802.11n (HT) rates (MCS0-MCS15), the client is not allowed to associate.

    The access point also does not use protection mechanisms (RTS/CTS or CTS-to-self when operating in this mode). This can potentially cause problems with other access points/clients operating on the same channel in 802.11a mode, but provides the best throughput for the access point and its 802.11n clients.

    The access point will still signal associated clients to use protection when they send data. The access point does this via a field in the beacon that it sends. So clients sending data to the access point will use protection, but data sent from the access point will not be protected.

    NOTE: This mode is sometimes incorrectly called Greenfield. Greenfield is an 802.11n-specific preamble that can be used by clients and access points. HP access points do not support this preamble and therefore do not support Greenfield mode.

    When to use this mode

    Use this mode when the access point is installed in an area where there is no legacy wireless traffic on the channel that the access point will use, and all potential wireless client devices support 802.11n.

  • 802.11n (2.4 GHz)

    Supported on
    MSM410, MSM422 (radio 1)
    Frequency band
    2.4 GHz
    Data rates
    Up to 300 Mb/s

    HP refers to this mode as Pure 802.11n. When operating in this mode, the access point does not permit non-802.11n clients to associate. Legacy clients can see the access point, and may attempt to associate, but they will be rejected. The access point makes this determination based on the supported rate set that the client presents during its association request. If the rate set does not include any of the 802.11n (HT) rates (MCS0-MCS15), it is not allowed to associate.

    The access point does not use protection mechanisms (RTS/CTS or CTS-to-self) when operating in this mode, which provides for the best throughput tor the access point and its 802.11n clients. However, if legacy clients are using the same channel, this can lead to collisions and potentially serious performance deterioration for all traffic (802.11n and legacy a/b/g) on the channel.

    The access point will still signal associated clients to use protection when they send data. The access point does this via a field in the beacons that it sends. So clients sending data to the access point will use protection, but data sent from the access point will not be protected.

    NOTE: This mode is sometimes incorrectly called Greenfield. Greenfield is an 802.11n-specific preamble that can be used by clients and access points. HP access points do not support this preamble and therefore do not support Greenfield mode.

    When to use this mode

    Use this mode when the access point is installed in an area where there is no legacy wireless traffic on the channel that the access point will use, and all potential wireless client devices support 802.11n.

  • 802.11n/a

    Supported on
    MSM410, MSM422 (radio 1)
    Frequency band
    5 GHz
    Data rates
    For 802.11n clients : Up to 300 Mb/s
    For 802.11a clients : Up to 54 Mb/s

    HP refers to this mode as Compatibility mode because the access point allows both 802.11n and legacy clients to associate. The access point advertises protection in the beacon when legacy clients are associated or operating on the same channel. This alerts associated 802.11n clients to use protection when transmitting. The access point also uses protection mechanisms (RTS/CTS or CTS-to-self) when sending 802.11n data to prevent disruption to legacy clients associated on the same channel.

  • 802.11n/g

    Supported on
    MSM410, MSM422 (radio 1)
    Frequency band
    2.4 GHz
    Data rates
    For 802.11n clients : Up to 130 Mb/s. (Up to 300 Mb/s when using a 40 MHz channel width, which is not recommended in the 2.4 GHz frequency band.)
    For 802.11g clients : Up to 54 Mb/s.

    This mode is the same as 802.11n/b/g except that 802.11b clients are prevented from associating. The access point does not advertise 1, 2, 5.5 and 11 Mb/s as supported rates in its beacons or Probe-Responses. The access point does not tell 802.11g clients to use protection, and this can cause collisions with any 802.11b clients present on the same channel. However, the access point uses protection mechanisms (RTS/CTS or CTS-to-self) when sending 802.11n data to prevent disruption to legacy (802.11a/b/g) clients associated on the same channel.

  • 802.11n/b/g

    Supported on
    MSM410, MSM422 (radio 1)
    Frequency band
    2.4 GHz
    Data rates
    For 802.11n clients : Up to 130 Mb/s (Up to 300 Mb/s when using a 40 MHz channel width, which is not recommended in the 2.4 GHz frequency band)
    For 802.11g clients : Up to 54 Mb/s
    For 802.11b clients : Up to 11 Mb/s

    HP refers to this mode as Compatibility mode because the access point allows both 802.11n and legacy clients to associate. The access point advertises protection in the beacon when legacy clients are associated or operating on the same channel. This alerts associated 802.11n clients to use protection when transmitting. The access point also uses protection mechanisms (RTS/CTS or CTS-to-self) when sending 802.11n data to prevent disruption to legacy clients associated on the same channel.

  • 802.11b

    Supported on
    MSM310, MSM320, MSM335, MSM410, MSM422
    Frequency band
    2.4 GHz
    Data rates
    Up to 11 Mb/s

    This is a legacy mode that can be used to support older wireless client stations.

  • 802.11b/g

    Supported on
    MSM310, MSM320, MSM335, MSM410, MSM422
    Frequency band
    2.4 GHz
    Data rates
    For 802.11g clients : Up to 54 Mb/s
    For 802.11b clients : Up to 11 Mb/s

    This is a legacy mode that can be used to support older wireless client stations.

  • 802.11g

    Supported on
    MSM310, MSM320, MSM335, MSM410, MSM422
    Frequency band
    2.4 GHz
    Data rates
    Up to 54 Mb/s

    This is a legacy mode that can be used to support older wireless client stations.

  • 802.11a

    Supported on
    MSM310, MSM320, MSM335, MSM410, MSM422
    Frequency band
    5 GHz
    Data rates
    Up to 54 Mb/s

    This is a legacy mode that can be used to support older wireless client stations.

  • 802.11a Turbo

    Supported on
    MSM310, MSM320, MSM335, MSM410, MSM422
    Frequency band
    5 GHz
    Data rates
    Up to 108 Mb/s

    Provides channel bonding in the 5 GHz frequency band for enhanced performance. Useful to provide increased thoughput when creating local mesh links between two access points.

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Channel width

Supported on : MSM410, MSM422 (radio 1), E-MSM430, E-MSM460, E-MSM466 (Not available in Monitor or Sensor modes).

802.11n allows for the use of the standard channel width of 20 MHz or a double width of 40 MHz. The double width is achieved by using two adjacent channels to send data simultaneously. This results in double the available bandwidth leading to much higher throughput.

Select the Channel width that will be used for 802.11n traffic. Available options are:

  • 20 MHz : Uses the standard channel width of 20 MHz. Recommended when the access point is operating in the 2.4 GHz band and multiple networks must co-exist in the same location.

  • Auto 20/40 MHz : The access point will advertise 40 MHz support to clients, but will use 20 MHz for each client that does not support 40 MHz.

    NOTE: On the E-MSM466, E-MSM460, and E-MSM430, when operating in the 2.4 GHz band, the access point will automatically switch to using a 20 MHz channel width if a legacy 802.11b/g client or access point is detected on the primary channel. When the legacy device is no longer present, the access point will revert back to using a 40 MHz channel width.

    The channel selected on the radio page is the primary channel and the secondary (or extension) channel is located adjacent to it. The secondary channel is either above or below depending on which channel was selected as the primary. In the 5 GHz band, the channels are paired: 36 and 40 are always used together, 44 and 48 are always used together, etc. It works slightly differently in the 2.4 GHz band: there user choose whether the extension channel should be above or below the beacon using the Channel extension parameter.

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Channel extension

Supported on : MSM410, MSM422 (radio 1), E-MSM430 (radio 2), E-MSM460 (radio 2), E-MSM466 (radio 2). Not available in Sensor mode.

This setting only appears when Wireless mode is set to 802.11n (2.4 GHz) , 802.11n/b/g , or 802.11 n/g and Channel width is set to Auto 20/40 MHz .

This setting determines where the second 20 MHz channel is located.

  • Above the beacon (+1) : The secondary channel is located on a channel above the currently selected channel.

  • Below the beacon (-1) : The secondary channel is located on a channel below the currently selected channel.

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Channel selection

Select channel (frequency) for wireless services. The channels that are available are determined by the radio installed in the access point and the regulations that apply in ones country.

Automatic channel selection

Use the Automatic option to have the access point select the best available channel. Control how often the channel selection is re-evaluated by setting the Interval parameter.

  • On the E-MSM430, E-MSM460, E-MSM466 : Scanning during the channel selection process can cause interruptions to voice calls. This only occurs each time the Interval expires. Therefore, configuring a short Interval is not recommended.

  • On the MSM310, MSM320, MSM335, MSM410, MSM422 : Scanning is continuously performed on all the channels in the currently selected Operating mode , even though the channel is only re-evaluated each time the Interval expires. (If Interval is set to Disabled , continuous scanning is not performed.) Continuous scanning can cause interruptions to voice calls. On dual-radio access points, user can avoid interruptions by setting one radio to operate in Monitor mode. For example, if radio 1 is set to Automatic and radio 2 is in Monitor mode, scanning occurs on radio 2 and interruptions on radio 1 do not occur.

    CAUTION: When using the Automatic option with an external antenna in the 2.4 GHz band, all channels must be set to the lowest acceptable value for your regulatory domain.

Manual channel selection

If setting the channel manually, for optimal performance when operating in 2.4 GHz modes, select a channel that differs from other wireless access points operating in neighboring cells by at least 25 MHz. For example, if another access point is operating on channel 1, set the access points to channel 6 or higher.

When operating in 802.11a or 802.11n (5 GHz) modes, channels do not interfere with each other, enabling access point to operate on two adjacent channels without interference.

HP access points support Dynamic Frequency Selection (802.11h) and Transmit Power Control (802.11d) for 802.11a operation in European countries. These options are automatically enabled as required. Channels used by dynamic frequency selection (DFS) for radar avoidance, are identified with an asterisk "* ".

  • On the MSM410, MSM422 (radio 1), E-MSM430, E-MSM460, E-MSM466 : When Wireless mode is 802.11n (5 GHz) or 802.11n/a and Channel width is Auto 20/40 MHz , the channel numbers in the Channel list include either a "(1) " or "(-1) " to their right. A "(1)" indicates that the 40 MHz channel is formed from the indicated channel plus the next channel. A "-1" indicates that the 40 MHz channel is formed from the indicated channel plus the previous channel.

    With a 40 MHz Channel width in the 5 GHz band, channel selection and usage is as follows for the first four channels:

    Channel selected
    Channels used
    36(1)
    36+40
    40(-1)
    40+36
    44(1)
    44+48
    48(-1)
    48+44
    NOTE: The channel selected is the primary channel and the channel above or below it becomes the secondary channel. The access point beacon is transmitted only on the primary channel and all legacy client traffic is carried on the primary channel.
  • On the MSM410, MSM422 (radio 1) : When Wireless mode is 802.11n (2.4 GHz) or 802.11n/g or 802.11n/b/g , and Channel width is Auto 20/40 MHz , the Channel extension parameter value affects which channels are shown in the Channel list. Although it is recommended that user use the 5 GHz band for all 802.11n activity, if user insist upon using 802.11n and a 40 MHz Channel width in the crowded 2.4 GHz band, it is best to select channels as follows, according to the number of 2.4 GHz channels available in user region.

    Available 2.4 GHz channels
    Channel width
    Recommended non-overlapping channels
    1 to 13
    20 MHz
    1, 7, 13
    1 to 13
    40 MHz
    1, 13 (If both are used, there will be some performance degradation)
    1 to 11
    20 MHz
    1, 6, 11
    1 to 11
    40 MHz
    1, 11 (If both are used, there will be some performance degradation)

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Interval

Not available in Monitor or Sensor modes.

When the Automatic option is selected for Channel , this parameter determines how often the access point re-evaluates the channel setting.

  • Select Time of day to have the channel setting re-evaluated at a specific time of day. Note that to prevent all access points from re-evaluating their channel at the same time, a random delay between 0 and 2 hours is added to the time of day for each access point.

  • Select Disabled to have the scan performed once when user select Save , and then only when the access point is restarted. This also prevents continuous scanning from being performed on the MSM310, MSM320, MSM335, MSM410, and MSM422.

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Time of day

Not available in Monitor or Sensor modes.

When the Time of day option is selected for Interval , this parameter determines the time of day that the access point re-evaluates the channel setting.

To prevent access points from re-evaluating their channel at the same time, a random delay between 0 and 2 hours is added to the time of day for each access point. For example, if 1AM is selected, the channel with be re-evaluated between 1AM and 3AM.

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Automatic channel exclusion list

Not available in Monitor or Sensor modes.

Used when Automatic is selected under Channel , this parameter determines the channels that are not available for automatic selection. To select more than one channel, hold down Ctrl as user select the channel names.

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Antenna selection

Supported on : MSM310, MSM320, MSM335, MSM422. Not available in Monitor or Sensor modes.

Select the antenna(s) to use for each radio. Antenna support varies on each access point.

In most access points, antenna diversity is supported. Diversity provides improved signal quality by using multiple antennas on the same radio.

NOTE:
  • When using an external antenna, it is your responsibility to make sure that the radio does not exceed the transmit power level for the country of use.
  • When creating a point-to-point local mesh link, it is recommended that you use an external directional antenna.
  • MSM310, MSM310-R, and MSM320

    Select Diversity , Main , or Auxiliary according to the following guidelines:

    • For a single antenna, connect one antenna to either Main or Aux and select the corresponding value.

    • For maximum wireless coverage, install an omnidirectional antenna on the Main and Aux antenna connectors and select Diversity .

    • When creating a point-to-point wireless bridge, it is recommended that a single directional antenna be used on either Main or Aux.

  • MSM320-R

    Only two antenna connectors are available on the MSM320-R. To use both radios, connect an antenna to each connector. Diversity is not supported.

  • MSM335

    Select either Internal or External according to the following guidelines:

    • The MSM335 features six internal antennas in its two flaps, providing two antennas for each of its three radios. Radios 1, 2, and 3, have corresponding external antenna connectors A, B and C for optional external antennas.

    • Diversity is supported on all three radios via the internal antennas, but not when using external antennas.

  • MSM422

    Select either Internal or External according to the following guidelines:

    • The MSM422 features three internal antennas in the lower flap for Radio 1 (802.11n/a/b/g) (corresponding to external connectors A, B and C) and two internal antennas in the upper flap for Radio 2 (801.11a/b/g) (corresponding to external connector D). If desired, install optional antennas via the external connectors.

    • Radio 1 supports diversity on its internal and external antennas (connectors A, B, and C). In 802.11n modes, a special form of diversity called MIMO is used.

    • For point-to-point local mesh links on Radio 1, install two directional antennas on connectors A and B. Installing a third directional antenna on connector C will increase performance only on the receive side.

    • Radio 2 supports diversity via its two internal antennas, but not when using an external antenna.

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Antenna gain

Supported on : MSM310. MSM310-R, MSM320, MSM320-R, E-MSM466. Not available in Monitor or Sensor modes.

For optimum performance, this parameter must be set to the gain of the antenna at the selected frequency (DFS channel).

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Max clients

Not available in Monitor or Sensor modes.

Specify the maximum number of wireless client stations that can be supported on this radio across all VSCs.

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