SonicWALL SonicPoint-N Dual-Band Getting Started Manual page 10

802.11 Comparison Chart
The following table compares signal characteristics as they
apply to the current 802.11 standards:
802.11a
USA Channels 23
EU Channels 23
Japan Channels 15
Frequency Band 5GHz
Max. Data Rate 54Mbps
Radius (Range) 90ft/25m
*Of the channels available with this technology, only three (3) are discrete.
Radio Frequency Barriers
Determining the location of RF barriers can be a painful part of
the placement process, but keep in mind that they can be used
beneficially to block signals where you do not want coverage.
The following tables list common RF barrier types:
Barrier Type
Open air
Glass, drywall, cube partitions
Stone floors and walls (brick/marble/granite)
802.11b 802.11g 802.11n
11* 11* 11*
13* 13* 13*
14* 14* 14*
2.4GHz 2.4GHz 2.4/5GHz
11Mbps 54Mbps 180Mbps
120ft/ 120ft/ 240ft/
35m 35m 70m
RF Signal
Blocking
Very Low
Low
Medium
Barrier Type
Concrete, security glass, stacked books/paper
Metal, metal mesh (chicken wire), re-enforced
concrete, water
Faraday cage
RF Interference
The following table lists several common sources of RF
interference:
Interference Source Possible RF
Interference
2.4GHz phones Entire range (hundreds
of feet)
Bluetooth devices Within 30 feet
Microwave oven** Within 10-20 feet
Scientific and medical Short distance, varies
equipment
Off-network access Entire range
points
RF reflective objects Long-range wireless
bridging
**Most newer model microwave ovens have sufficient shielding to negate possible
RF interference.
SonicWALL SonicPoint Getting Started Guide
RF Signal
Blocking
High
Very High
Extremely High
Band(s)
Affected
802.11b/g/n
802.11b/g/n
802.11b/g/n
802.11b/g/n
All
All
Page 10