D-Link DWC-1000 User Manual 109
Section 4 - Advanced WLAN Conguration
Field Description
RF Scan Sentry
Select this option to allow the radio to operate in sentry mode. When the RF
Scan Sentry option= ON, the radio primarily performs dedicated RF scanning.
The radio passively listens for beacons and trac exchange between clients and
other access points, but does not accept connections from wireless clients.
In sentry mode, all VAPs are disabled. Networks that deploy sentry APs or radios
can detect devices on the network quicker and perform more thorough security
analysis. In this mode, the radio switches from one channel to the next. The
length of time spent on each channel is controlled by the scan duration. The
default scan duration is 10 milliseconds.
RF Scan Interval
This eld controls the length of time between channel changes during the RF
Scan.
RF Scan Sentry Channels
The radio can scan channels in the radio frequency used by the 802.11b/g band
(2.4 GHz), the 802.11a band (5 GHz), or both bands. Select the channel band for
the radio to scan.
Note: The band selection applies only to radios in sentry mode and is dependent
upon the capabilities of the radio.
Mode
The Mode denes the Physical Layer (PHY) standard the radio uses.
Select one of the following modes for each radio interface:
• IEEE 802.11a is a PHY standard that species 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 802.11b/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 802.11a/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.
• 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.
• 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 or 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 or
802.11a).
• 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
802.11a or 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 or
802.11a).
• IEEE 802.11n/ac operates in 5GHz ISM band and includes support both 11n
and 11ac devices.
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