and however communicated o r stored, while ma king more efficient use of hardware
and/or software than pre viou s encryption standards. It i s also included in IEEE 802.11i
standard. Compare with AES, TKIP is a tem po rary protocol for replacing WEP security
until manufacturers impl ement AES at the ha rdware level.
10. Can Wireless products support printer sharing？
Wireless products perform the same function as LAN p roducts. Therefore, Wireless
products can work with Netware, Windows 2000, or othe r LAN operating system s to
support printer or file sharing.
11. W oul d t h e in forma ti on b e in terce pte d w hile tra nsmi tti n g o n ai r？
WLAN features two-fold p rotection in security. On the h ardware side, as with Direct
Sequence Spread Spect rum technology, it has the inherent security feature of
scrambling. On the softwa re side, WLAN series offe r the enc ryption function (WEP) to
enhance security and Acc e ss Control. Users can set it up depending upon their need s.
12. What is DSSS？Wha t is FHSS？And what are their differences？
Frequency-hopping spread-spectrum (FHSS) uses a narrowband carrier that changes
frequency in a patte rn that is known to both t ransmitter and receiver. Properly
synchronized, the net eff ect is to maintain a single logi cal channel. To an unintende d
receiver, FHSS appears to be short-duration impul se noise. Direct-sequence spread-
spectrum (DSSS) gene rates a redundant bit pattern for each bit to be transmitted. Thi s
bit pattern is called a chip (or chipping code). T he longer the chip i s, the gre ater the
probability that the original data can be recovered. Even if one or more bits in the chip
are damaged during t ransmission, statistical techniques embedded in the radio can
recover the original data without-the need for retran smi ssion. To an unintended
receiver, DSSS appea r s a s low power wideband noise and i s rejected (ignored) by
most narrowband receive rs.
13. What is Spread Spectru m？
Spread Spectrum technology i s a wideband radio frequenc y technique developed by
the military for use in reliable, secure, mission-critical communication systems. It is
designed to trade off band width efficiency for reliability, integrity, and security. In othe r
words, more bandwidth i s consumed than in the ca se of narrowband transmission, but
the trade off produ ce s a signal that is, in effec t, loude r and thus easier to dete ct,
provided that the receiver knows the parameters of the spread-spectrum signal being
broadcast. If a re ceive r is not tuned to the right f requency, a spread –spectrum signal
looks like background noi se. There are two main alte rna ti ve s, Direct Sequence Spread
Spectrum (DSSS) and F requen cy Ho ppi ng Spread Spectrum (FHSS ).
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