Toshiba 2000 User Manual page 189

R-F Frequency Band
Modulation Technique
Spreading
Bit Error Rate (BER)
Nominal Output Power
Transmit Rate
Receiver Sensitivity
Delay Spread
(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.
Table F-5 Radio characteristics
2.4GHz (2400-2483.5 MHz)
Direct Sequence Spread Spectrum
CCK for High & Medium Transmit Rate
DQPSK for Standard Transmit Rate
DBPSK for Low Transmit Rate
11-chip Barker Sequence
Better than 10
15 dBm
High
Speed
11 Mb/s
-83 dBm
65 ns
-5
Medium Standard Low
Speed Speed
5.5 Mb/s 2 Mb/s
-87 dBm -91 dBm
225 ns 400 ns
Appendix F
Speed
1Mb/s
-94 dBm
500 ns
F-17