Siemens EF 711 Series Betriebsanweisung PDF herunterladen (Seite 93)

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101

Configuring the Wireless AP

SCALANCE WLC711

User Guide, V8.11, 07/2012, C79000-G8976-C260-03 3-5

Figure 3-2 MIMO in SCALANCE IWLAN 802.11n AP

Note:

MIMO should not be confused with the Diversity feature. While Diversity is the use of two antennas to

increase the odds that a better radio stream is received on either of the antennas, MIMO antennas radiate

and receive multi-streams of the same packet to achieve the increased throughput.

The Diversity feature is meant to offset the liability of RF corruption, arising out of multipath, whereas MIMO

converts the liability of multipath to its advantage.

Because the 802.11n AP operates with multiple antennas, it is capable of picking up even the

weakest signals from the client devices.

Channel Bonding

In addition to MIMO technology, the 802.11n AP makes a number of additional changes to the

radio to increase the effective throughput of the Wireless LAN. The radios of regular SCALANCE

IWLAN APs use radio channels that are 20 MHz wide. This means that the channels must be

spaced at 20 MHz to avoid interference. The radios of 802.11n AP can use two channels at the

same time to create a 40 MHz wide channel. By using the two 20 MHz channels in this manner, the

802.11n AP achieves more than double the throughput. The 40-MHz channels in 802.11n are two

adjacent 20-MHz channels, bonded together. This technique of using two channels at the same

time is called channel bonding.

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