Manual Lancom L-320agn Wireless (page 14 of 97) (English)

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LANCOM L-32x Access Point series

 Chapter 1: Introduction

These two features increase the maximum useable bandwidth of 54 Mbps for

802.11a/g to 65 Mbps for 802.11n. This increase is not exactly spectacular,

but it can be further improved by using the following features:

MIMO technology

MIMO (multiple input multiple output) is the most important new technology

contained in 802.11n. MIMO uses several transmitters and several receivers

to transmit up to four parallel data streams on the same transmission channel

(currently only two parallel data streams have been implemented). The result

is an increase in data throughput and improved wireless coverage.

For example, the Access Point splits the data into two groups which are then

sent simultaneously via separate antennas to the WLAN client. Data through-

put can therefore be doubled using two transmitting and receiving antennas.

But how can several signals be transmitted on a single channel simultane-

ously? This was considered impossible with previous WLAN applications.

Let us consider how data is transmitted in "normal" wireless LAN networks:

Depending on antenna type, an Access Point's antenna broadcasts data in

several directions simultaneously. These electromagnetic waves are reflected

Gross bandwidth

Payload rate for 802.11a/b/g: 1/2

Checksum Payload data

Payload rate for 802.11a/b/g: 3/4

Maximum payload rate for 802.11n: 5/6

MIMO AP 802.11n

MIMO Client 802.11n

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Lancom L-320agn Wireless Manual

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