Planet WML-8315 Инструкция по эксплуатации онлайн [35/35] 65754
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.
14. 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).
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Содержание
- 1g wireless mimo pci adapter 1
- User s manual 1
- Wml 8315 wml 8315 1
- All brand and product names mentioned in this manual are trademarks and or registered trademarks of their respective holders 2
- Copyright 2
- Fcc caution 2
- Federal communication commission fcc radiation exposure statement 2
- Federal communication commission interference statement 2
- R tte compliance statement 2
- Safety 2
- Eu countries intended for use 3
- Revision 3
- Weee regulation 3
- Configuration utility 9 4
- Contents 4
- Installation procedure 3 4
- Introduction 1 4
- Troubleshooting 29 4
- Features 5
- Introduction 5
- Specifications 5
- Package contents 6
- Configuration utility installation 7
- Installation procedure 7
- Guidelines for the hardware installation 10
- Hardware installation 10
- Installation procedure 10
- Driver installation 11
- Configuration utility 13
- Site survey 14
- Profile 15
- Configuration 3 configuration 16
- Configure the profile 16
- Authentication and security 18
- X setting certification 20
- 1 client requests to login the network 21
- 2 login with username password 21
- 3 send username password to radius server 21
- 4 approve or deny user login to the lan 21
- Ieee 802 x access client 21
- Radius client 21
- Radius server 21
- X setting ca server 23
- Link status 24
- Statistics 25
- Advance 26
- Wmm function 30
- Advanced settings 32
- Troubleshooting 33
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