Planet WNL-9320 Инструкция по эксплуатации онлайн [41/41] 65801

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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).

14. What is WMM?

Wi-Fi Multimedia (WMM), a group of features for wireless networks that improve the user

experience for audio, video and voice applications. WMM is based on a subset of the IEEE

802.11e WLAN QoS draft standard. WMM adds prioritized capabilities to Wi-Fi networks and

optimizes their performance when multiple concurring applications, each with different latency

and throughput requirements, compete for network resources. By using WMM, end-user

satisfaction is maintained in a wider variety of environments and traffic conditions. WMM makes it

possible for home network users and enterprise network managers to decide which data streams

are most important and assign them a higher traffic priority.

15. What is WMM Power Save?

WMM Power Save is a set of features for Wi-Fi networks that increase the efficiency and

flexibility of data transmission in order to conserve power. WMM Power Save has been optimized

for mobile devices running latency-sensitive applications such as voice, audio, or video, but can

benefit any Wi-Fi device. WMM Power Save uses mechanisms included in the IEEE 802.11e

standard and is an enhancement of IEEE 802.11 legacy power saves. With WMM Power Save,

the same amount of data can be transmitted in a shorter time while allowing the Wi-Fi device to

remain longer in a low-power “dozing” state.

16. What is GI?

GI stands for Guard Interval. It’s a measure to protect wireless devices from cross- interference.

If there are two wireless devices using the same or near channel, and they are close enough,

radio interference will occur and reduce the radio resource usability.

17. What is STBC?

STBC stands for Space-Time Block Coding, which is a technique used to transfer multiple copies

of data by multiple antenna, to improve data transfer performance. By using multiple antennas,

not only data transfer rate is improved, but also the wireless stability.