Rockwell Automation 1783-WAPxxx Stratix 5100 Wireless Access Point User Manual - Manual (Page 256)

256 Rockwell Automation Publication 1783-UM006A-EN-P - May 2014
Chapter 7 Configuring Radio Settings
Each 2.4 GHz channel covers 22 MHz. The bandwidth for channels 1, 6, and 11
does not overlap, so you can set up multiple access points in the same vicinity
without causing interference. Both 802.11b and 802.11g 2.4 GHz radios use the
same channels and frequencies.
The 5 GHz radio operates on eight channels from 5180…5320 MHz. Each
channel covers 20 MHz, and the bandwidth for the channels overlaps slightly. For
best performance, use channels that are not adjacent (44 and 46, for example) for
radios that are close to each other.
Because they change frequently, channel settings are not in this document. For
up-to-date information on channel settings for your access point or bridge, see
Channels and Maximum Power Settings for Cisco Aironet Autonomous Access
Points and Bridges
.
802.11n Channel Widths 802.11n lets both 20 Mhz and 40 Mhz channel widths consisting of 2 contiguous
non-overlapping channels (for example, 2.4 GHz channels 1 and 6)
One of the 20 Mhz channels is called the control channel. Legacy clients and 20
Mhz high throughput clients use the control channel. Beacons can be sent only
on this channel. The second 20 Mhz channel is called the extension channel. 40
Mhz stations use this channel and the control channel simultaneously.
A 40 Mhz channel is specified as a channel and extension, such as 1,1. In this
example, the control channel is channel 1 and the extension channel is above it.
Beginning in privileged EXEC mode, follow these steps to set the wireless access
point channel width:
1. Enter global configuration mode.
configure terminal
2. Enter interface configuration mode for the radio interface.
The 2.4 GHz radio and the 802.11n 2.4 GHz is radio 0.
The 5 GHz radio and the 802.11n 5 GHz is radio 1.
interface dot11radio {0 | 1}
3. Set the default channel for the wireless access point radio.
To search for the
least-congested channel on startup, enter least-congested .
• Use the
width option to specify a bandwidth to use.
This option is available for 1140 and 1250 series access point and consists
of three available settings: 20, 40-above, and 40-below. choosing 20 sets the
channel width to 20 MHz. Choosing 40-above sets the channel width to
TIP Too many access points in the same vicinity creates radio congestion that can
reduce throughput. A careful site survey can determine the best placement of
access points for maximum radio coverage and throughput.