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    Configuring General Wireless Settings

    NetScreen-5GT Wireless security device contains a radio transmitter/receiver with a frequency range of 2.4 GHz to 2.4835 GHz, and supports the IEEE 802.11b and 802.11g standards. When you first deploy the NetScreen-5GT Wireless device on your network, the radio transmitter/receiver is configured with default settings designed to work in most networking environments.

    You can edit the default values for the following radio settings:

    • Antenna settings
    • Channel settings
    • Operation Mode settings
    • Transmission Power and Rate settings

    The following topics will detail each radio settings:

    Configuring Antennas

    You can use one antenna or a pair of antennas on the NetScreen-5GT Wireless security device. Select the antenna option that meets your network needs and that corresponds to the actual physical antenna configuration on the device.

    To configure the antenna, in the device navigation tree, select Wireless Settings then select one of the antenna configurations:

    • Diversity antennas —Select this option when the security device is using a pair of diversity antennas that provide 2–dBi omnidirectional coverage (signal radiates 360 degrees horizontally). These antennas provide a fairly uniform level of signal strength within the area of coverage and are suitable for most installations (diversity antennas ship with the NetScreen-5GT Wireless device). This is the default option.
    • Antenna A or Antenna B—Select one of these options when using a single antenna for 2–dBi omnidirectional coverage (signal radiates 360 degrees horizontally). Unlike diversity antennas, which function as a pair, the external antenna operates singly to eliminate an echo effect that can sometimes occur from slight delay characteristics in signal reception when two antennas are in use.

    Note: On the NetScreen-5GT Wireless security device, antenna A is nearest the power connector port.

    When importing wireless settings from a security device, Network and Security Manager (NSM) automatically displays the antenna settings configured on the physical device. Before activating a modeled wireless security device, however, you must ensure that the antenna setting you select in the NSM UI matches the actual antenna configuration on the physical device. For example, if you model the device using antenna A as a single antenna providing 2–dBi omnidirectional coverage, you or the device administrator must have connected an antenna to antenna port A on the physical device before you activate that device.

    Configuring Channels

    The wireless security device uses channels to send and receive wireless traffic. The device uses the same channel for all basic service sets (BSSs), which share the same overall bandwidth, and distinguishes traffic from different BSSs by the SSID number.

    By default, the wireless security device automatically selects the appropriate channel based on the country code. To select a specific channel, in the device navigation tree, select Wireless Settings and change the Channel for Wireless AP Radio setting to Channel Number, and then enter the channel number you want the device to use. To enable the device to use additional channels that might be available in your country, select Extended Channel Mode.

    The regulatory domain for channel assignments is not configurable, and is preset as one of the following:

    • FCC (USA)—This regulatory domain automatically sets the country code to USA. Because you cannot change this setting, it does not appear in the UI.
    • TELEC (Japan)—This regulatory domain automatically sets the country code to Japan; you cannot change this setting. Because you cannot change this setting, it does not appear in the UI.
    • WORLD (all countries)— This regulatory domain requires you to select from a list of countries (can select USA or Japan). If the device is preset to use FCC or TELEC, this setting does not appear in the UI.

    Note: Although you can select the Extended Channel Mode option when the regulatory domain is WORLD and the selected country code is USA, there are no extended channels in the USA.

    Configuring Operation Mode Settings

    The NetScreen-5GT Wireless supports both 802.11b and 802.11g operation modes, either simultaneously (default setting) or exclusively. To configure the operation mode, in the device navigation tree, select Wireless Settings and then select one of the following modes:

    • To enable both 802.11b and 80211g wireless clients to connect to the wireless security device, select 802.11b/g.
    • To enable only 802.11b wireless clients to connect to the wireless security device, select 802.11b.
    • To enable only 80211g wireless clients to connect to the wireless security device, select 802.11b/g, then select the 802.11g Only check box.

    Note: We recommend you enable CTS protection (see Configuring Control Frame Protection section in Configuring Advanced Wireless Settings) to avoid collisions when supporting 802.11b and 802.11g operation modes.

    Configuring Transmission Settings

    Use the transmission settings to control the power and rate used by the wireless interfaces. To configure the transmission settings, in the device navigation tree, select Wireless Settings, and then edit the default values for the following settings:

    • Transmit Power—This setting controls the power transmission and radio range. By default, the power level is set to full; available settings include an eighth, half, minimum, or quarter. You might need to edit this setting when using more than one wireless interface in the same location and frequency.
    • Data Rate for AP—This setting controls the wireless interface data transmission rate for sending frames. By default, the rate is set to best rate (the wireless interface uses the best rate first, and then automatically falls back to the next rate if transmission fails).
    • For 11b transmissions, available rates are 1, 2, 5.5, and 11mbps.
    • For 11g transmissions, available rates are 1, 2, 5.5, 6, 9, 11, 12, 18, 24, 36, 48, 54 Mbps.

    Published: 2013-01-02