Configuring Antennas; Configuring Channels - Juniper NETWORK AND SECURITY MANAGER 2010.4 - CONFIGURING SCREENOS DEVICES GUIDE REV 01 Manual

Configuring Antennas

Configuring Channels

Copyright © 2010, Juniper Networks, Inc.
Antenna settings
Channel settings
Operation Mode settings
Transmission Power and Rate settings
The following topics will detail each radio settings:
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.
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
Chapter 14: WAN, ADSL, Dial, and Wireless
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