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F-17
A
PPENDIX
F
Appendix F
Table F-5 Radio characteristics
R-F Frequency Band
2.4GHz (2400-2483.5 MHz)
Modulation Technique
Direct Sequence Spread Spectrum
n
CCK for High & Medium Transmit Rate
n
DQPSK for Standard Transmit Rate
n
DBPSK for Low Transmit Rate
Spreading
11-chip Barker Sequence
Bit Error Rate (BER)
Better than 10
-5
Nominal Output Power
15 dBm
Transmit Rate
High
Medium
Standard
Low
Speed
Speed
Speed
Speed
11 Mb/s
5.5 Mb/s
2 Mb/s
1Mb/s
Receiver Sensitivity
-83 dBm
-87 dBm
-91 dBm
-94 dBm
Delay Spread
65 ns
225 ns
400 ns
500 ns
(at FER of <1%)
The range of the Wireless signal is related to the Transmit Rate of the Wireless
communication. Communications at lower Transmit range may travel longer
distances.
NOTE: The range values listed in Table F-5 are typical distances as
measured at the TOSHIBA Wireless LAN laboratories. These values
provide rule-of-thumb guides. They may vary according to the actual
radio conditions at the location where the Wireless LAN product is
installed.
◆
The range of your Wireless devices can be affected when the antennas are
placed near metal surfaces and solid high-density materials.
◆
Range is also affected by obstacles in the signal path of the radio that may
either absorb or reflect the radio signal.
Table F-5 lists the typical ranges when used indoors in office environments such as
the following:
◆
In Open Office environments, where antennas can see each other, i.e. there are
no physical obstructions between them.
◆
In Semi-open Office environments, where work space is divided by shoulder-
height, hollow wall elements; antennas are at desktop level.
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