Edimax EW-7708Pn Datasheet download pdf (Page 69)

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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 save. 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.

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Edimax EW-7708Pn Datasheet Page 69