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Unied Access Point Administrator’s Guide

Page 43

October 2017

Section 4 - Managing the Access Point

Field Description

Mode The Mode denes the Physical Layer (PHY) standard the radio uses.

Note: The modes available depend on the country code setting and the radio selected.

Select one of the following modes for radio 1:

•) IEEE 802.11a is a PHY standard that species operating in the 5 GHz U-NII band

using orthogonal frequency division multiplexing (OFDM). It supports data rates

ranging from 6 to 54 Mbps.

•) IEEE 802.11a/n operates in the 5 GHz ISM band and includes support for both

802.11a and 802.11n devices. IEEE 802.11n is an extension of the 802.11 standard

that includes multiple-input multiple-output (MIMO) technology. IEEE 802.11n

supports data ranges of up to 248 Mbps and nearly twice the indoor range of 802.11

b, 802.11g, and 802.11a.

•) 5 GHz IEEE 802.11n is the recommended mode for networks with 802.11n devices

that operate in the 5 GHz frequency that do not need to support 802.11a devices.

IEEE 802.11n can achieve a higher throughput when it does not need to be

compatible with legacy devices (802.11a).

Select one of the following modes for radio 2:

•) IEEE 802.11b/g operates in the 2.4 GHz ISM band. IEEE 802.11b is an enhancement

of the initial 802.11 PHY to include 5.5 Mbps and 11 Mbps data rates. It uses direct

sequence spread spectrum (DSSS) or frequency hopping spread spectrum (FHSS)

as well as complementary code keying (CCK) to provide the higher data rates. It

supports data rates ranging from 1 to 11 Mbps. IEEE 802.11g is a higher speed

extension (up to 54 Mbps) to the 802.11b PHY. It uses orthogonal frequency division

multiplexing (OFDM). It supports data rates ranging from 1 to 54 Mbps.

•) IEEE 802.11b/g/n operates in the 2.4 GHz ISM band and includes support for 802.11b,

802.11g, and 802.11n devices.

•) 2.4 GHz IEEE 802.11n is the recommended mode for networks with 802.11n devices

that operate in the 2.4 GHz frequency that do not need to support 802.11b/g

devices. IEEE 802.11n can achieve a higher throughput when it does not need to be

compatible with legacy devices (802.11b/g).

•) IEEE 802.11a/n/ac: All the 802.11a, 802.11n and 802.11ac clients operating in the 5

GHz frequency can connect to the AP.

•) IEEE 802.11n/ac: 802.11n clients and 802.11ac clients operating in the 5 GHz

frequency can connect to the AP.

Channel Select the Channel.

The range of available channels is determined by the mode of the radio interface and the

country code setting. If you select Auto for the channel setting, the AP scans available

channels and selects a channel where no trafc is detected.

The channel denes the portion of the radio spectrum the radio uses for transmitting and

receiving. Each mode offers a number of channels, depending on how the spectrum is

licensed by national and transnational authorities such as the Federal Communications

Commission (FCC) or the International Telecommunication Union (ITU-R).

When automatic channel assignment is enabled on the Channel Management page for

Clustering, the channel policy for the radio is automatically set to static mode, and the Auto

option is not available for the Channel eld. This allows the automatic channel feature to set

the channels for the radios in the cluster.

Channel Bandwidth

(802.11n and

802.11ac modes

only)

The 802.11n specication allows a 40 MHz wide channel in addition to the legacy 20 MHz

channel available with other modes. The 40 MHz channel enables higher data rates but

leaves fewer channels available for use by other 2.4 GHz and 5 GHz devices.

The 802.11ac specication allows an 80 MHz-wide channel in addition to the 20 MHz and 40

MHz channels.

Set the eld to 20 MHz to restrict the use of the channel bandwidth to a 20 MHz channel.

For the 802.11ac mode, set the eld to 40 MHz to prevent the radio from using the 80 MHz

channel bandwidth.

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