Canyon cnp-wf518n1 Инструкция по эксплуатации онлайн [64/65] 151573

10. Can Wireless products support printer sharing?

Wireless products perform the same function as LAN products. Therefore,

Wireless products can work with Netware, Windows 2000, or other LAN

operating systems to support printer or file sharing.

11. 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.

12. 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 is, 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.

13. What is Spread Spectrum?

Spread Spectrum technology is a wideband radio frequency technique

developed by the military for use in reliable, secure, mission-critical

communication systems. It is designed to trade off bandwidth efficiency for

reliability, integrity, and security. In other words, more bandwidth is

consumed than in the case of narrowband transmission, but the trade off

produces a signal that is, in effect, louder and thus easier to detect, provided

that the receiver knows the parameters of the spread-spectrum signal being

broadcast. If a receiver is not tuned to the right frequency, a

spread –spectrum signal looks like background noise. There are two main

alternatives, Direct Sequence Spread Spectrum (DSSS) and Frequency

Hopping Spread Spectrum (FHSS).