User's Manual

Wireless PCMCIA Card

described in the IEEE 802 .11 standard.

ü Can Wireless products support printer sharing

？

Wireless products perform the same function as LAN

products. Therefore, Wireless products can work with

Netware, Windows NT/2000, or other LAN operating

systems to support printer or file sharing.

ü 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 series offer the

encryption function (WEP) to enhance security and

Access Control. Users can set it up depending upon their

needs.

ü What is DSSS

？

What is FHSS

？

And what are their

differences

？

Frequency-hopping spread-spectrum (FHSS) uses a

narrowband carrier that changes frequency in a pattern

that is known to both transmitter and receiver. Properly

synchronized, the net effect is to maintain a single logical

channel. To an unintended receiver, FHSS appears to be

short-duration impulse noise. Direct-sequence

spread-spectrum (DSSS) generates a redundant bit pattern

for each bit to be transmitted. This bit pattern is called a

chip (or chipping code). The longer the chip, the greater

the probability that the original data can be recovered.

Even if one or more bits in the chip 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.