A.5 FAQ

Question

Answer

Wireless Broadband Router

Can I run an application from a remote computer over the wireless network?

This will depend on whether or not the application is designed to be used over a network. Consult the application’s user guide to determine if it supports operation over a network.

Question

Answer

Can I play computer games with other members of the wireless network?

Yes, as long as the game supports multiple players over a LAN (local area network).

Refer to the game’s user guide for more information.

Question

What is Spread Spectrum?

 

 

 

 

 

 

Answer

Spread Spectrum technology is a wideband radio frequency

 

 

technique developed by the military for use in reliable, secure,

 

 

mission-critical communications 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).

 

 

 

 

 

Question

What is DSSS? What is FHSS? And what

are their

 

 

differences?

 

 

Answer

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

 

 

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