Barco ClickShare Instrukcja Użytkownika Pobierz pdf (Strona 3)

Wi-Fi and Security Considerations for ClickShare

Page 3 of 14

ClickShare allows the use of IEEE802.11n, which has

significant advantages compared to legacy wireless

technologies – for example, it offers improved performance,

coverage and robustness compared to older IEEE802.11

standards (IEEE802.11a/b/g). Another advantage is that it can

use both the 2.4GHz and the (less crowded) 5GHz bands.

However, it is still a wireless technology, so successful

deployment requires careful planning based on a knowledge of

the technology.

Key advantages of IEEE802.11n include:

•

Frame aggregation: 802.11n boosts MAC (media access

control) layer performance by allowing 802.11n devices to

aggregate several packets into a single packet, which

avoids the wasted overhead between frames.

•

MIMO (multiple input, multiple output): this technology

uses multiple antennas at both the transmitter and the

receiver. MIMO exploits the fact that RF signals reflect off

objects in their path, causing multi-path interference.

MIMO transmits separate data streams at the same

frequency but over different spatial channels (spatial

multiplexing), thereby turning multipath into an

advantage by making the channel more efficient.

•

Channel bonding: in contrast to 802.11a and 802.11g,

802.11n can bond two 20MHz channels together to form a

single 40MHz channel, which boosts the maximum

throughput significantly.

Some legacy hardware sensors used in enterprise wireless

intrusion detection systems (IDS) may not be able to detect

802.11n APs. The same applies for network management

tools. Be sure that the spectrum analyzers that are used

support MIMO spatial streams.

Real world performance depends on many factors, including

environmental interference, system design, radio

configuration, network design and building construction. We

have designed ClickShare using best practices, but the

environment always plays an important role. Factors that limit

the performance of an IEEE802.11n system include:

•

Legacy station support: 802.11n access points can be

configured to interoperate with legacy IEEE802.11b/g/a

devices. However, this reduces performance, because the

legacy systems typically consume more “air time”, so that

the faster 802.11n endpoints must wait for the slower

legacy systems before they can use the WLAN.

•

Multi-path reflections: 802.11n uses multi-path reflections

to its advantage. Therefore, environments with little or no

multi-path reflections reduce IEEE802.11n’s performance.

•

No channel bonding: without channel bonding, the

IEEE802.11n infrastructure is used below its full potential.

Therefore, in the 5GHz band, IEEE802.11n can be

IEEE802.11N

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