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are damaged during transmission, statistical techniques embedded in the radio can
recover the original data without the need for retransmission. To an unintended
receiver, DSSS appears as low power wideband noise and is rejected (ignored) by
most narrowband receivers.
5. Would the information be intercepted while transmitting on air?
WLAN features two-fold protection in security. On the hardware side, as with Direct
Sequence Spread Spectrum technology, it has the inherent security feature of
scrambling. On the software side, WLAN offers the encryption function (WEP) to
enhance security and access control.
6. What is WEP?
WEP is Wired Equivalent Privacy, a data privacy mechanism based on a 64-bit or 128-
bit shared key algorithm, as described in the IEEE 802.11 standard.
7. What is infrastructure mode?
When a wireless network is set to infrastructure mode, the wireless network is
configured to communicate with a wired network through a wireless access point.
8. What is roaming?
Roaming is the ability of a portable computer user to communicate continuously while
moving freely throughout an area greater than that covered by a single access point.
Before using the roaming function, the workstation must make sure that it is the same
channel number with the access point of dedicated coverage area.
9. What is ISM band?
The FCC and their counterparts outside of the U.S. have set aside bandwidth for
unlicensed use in the ISM (Industrial, Scientific and Medical) band. Spectrum in the
vicinity of 2.4 GHz, in particular, is being made available worldwide. This presents a
truly revolutionary opportunity to place convenient high-speed wireless capabilities in
the hands of users around the globe.
10. What is the IEEE 802.11g standard?
Approved in June, 2003 as an IEEE
standard for wireless local area networks
(WLAN
s), 802.11g offers wireless transmission over relatively short distances at up to
54 megabit
s per second (Mbps) compared with the 11 megabits per second of the
802.11b
(Wi-Fi) standard. Like 802.11b, 802.11g operates in the 2.4 GHz range and is
thus compatible with it.