Toshiba Satellite 5000 Series, Руководство пользователя

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G-3
A
PPENDIX
G
Table F-5 Radio characteristics
R-F Frequency Band 2.4GHz (2400-2483.5 MHz)
Modulation Technique Direct Sequence Spread Spectrum
■
CCK for High & Medium Transmit Rate
■
DQPSK for Standard Transmit Rate
■
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.
Appendix G