User Guide

Table Of Contents
Bridge GUI Guide: Network Configuration
62
5 GHz and 2.4 GHz Options
Radios installed as Radio 1 in radio-equipped Fortress Bridges
(refer to Table 3.3, above) can operate in either the 5 GHz
802.11a frequency band or the 802.11g 2.4 GHz band of the
radio spectrum, according to your selection in the
Band field.
By default, a dual-band radio installed as Radio 1 in a multi-
radio Bridge is configured to operate in the 2.4 GHz 802.11g
band. The single dual-band radio installed in the ES210 is
configured to operate in the 802.11a band by default.
CAUTION:
The
4.400–4.750 GHz
frequency range is regu-
lated by the U.S. Depart-
ment of Defense. Use of
military band radios is
strictly forbidden out-
side of U.S. military ap-
plications and authority.
In Bridges equipped with more than one radio, the additional
radio(s) can function in only a single frequency band: the
5 GHz 802.11a band in standard-equipment radios, or the
4.4 GHz military band in Bridges that support this option.
The radio
Band setting is among those subject to the relevant
regulatory domain (Section 3.3.1.3). In some cases, in order to
bring the Bridge into compliance, dual-band radios could be
automatically fixed on the 802.11g band and radios fixed on the
802.11a band could be disabled altogether. Refer to Section
3.3.2 for more operational detail, and consult your local
regulatory authority for the applicable specifications and
requirements for radio devices and transmissions.
802.11n Options
NOTE: Although
fully compatible
with the IEEE standard,
Bridge 802.11n-capable
radios cannot perform
MIMO (Multiple-Input
Multiple-Output), or
spatial multiplexing, at
this time.
BSSs configured on the radio(s) installed in certain Bridge
models are additionally capable of 802.11n operation (refer to
Table 3.3 on page 57), as defined by this recent IEEE
amendment to the 802.11 standards.
The ES210 Bridge’s
Station Mode function (refer to Section
3.3.5) does not support 802.11n operation. You must set the
ES210 radio’s
Band to 802.11a or 802.11g before you can add a
Station Interface to the ES210 radio.
A Bridge radio BSS configured to use the 802.11n standard is
fully interoperable with other 802.11n network devices.
Figure 3.6. 802.11n-capable, dual-band radio
Band
options, ES210, ES440, ES820
Selecting an 802.11n option in a radio’s Band field permits the
Bridge to take advantage of radio enhancements and traffic
handling efficiencies defined in the newer standard, including
both 20 MHz and 40 MHz channel widths, frame aggregation