ZyXEL Communications PLA-401 - V3.0.5 Spécifications télécharger pdf (Page 4)

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ZyXEL NWA3560-N

Dual-Radio Business Access Point

The Rise and Rise of Dual Band WiFi

Market research has shown that not only is IEEE 802.11n establishing itself as the WiFi

technology of choice but to guarantee connectivity in today's multi device, always

available on the web environment choosing the right frequency band is critical to

ensure ubiquitous connectivity in your WLAN deployment.

Signal interference problems

One of the main issues with installing Wireless

LAN networks is the popularity of the technology.

2.4Ghz Wireless LAN networks can experience RF

interference from microwaves, cordless phones

and more importantly in recent times are very

susceptible to interference from other 2.4Ghz

Wireless LAN networks. The signal interference

degrades the performance of the network by

blocking or disconnecting users or access points

from communicating. It is not easy to reduce

established 2.4Ghz interference as you cannot

make businesses on other oors in your building

or near you stop using WiFi, so you should

consider deployment of the 5Ghz Frequency

band. The IEEE 802.11a 5Ghz frequency band

operates at lower levels when compared to

the 2.4Ghz frequency band which reduces

interference and oers higher 802.11n data rates.

Performance v connectivity

From a performance perspective the 5Ghz

frequency has a much greater spectrum available

which means you would get a signicant increase

in performance over the 2.4Ghz frequency. This is

achieved by the use of the 802.11n technologies

optional 40Mhz channels instead of the more

traditional 20Mhz and is the only way to really

achieve the highest quoted performance and

speeds of an 802.11n network.

From a supported WiFi client and device

perspective the rst devices that support the

802.11n a/b/g/n wireless LAN technologies are

becoming available on the marketplace and

new versions of the most popular tablets are

also quoted as supporting both the 5Ghz and

the 2.4Ghz frequency to enhance performance

Evolution of connectivity

Historically when a business user entered a

location where wireless LAN networking was

available life was simple. The user probably had

one device usually a laptop that they wished to

connect so that a link could be established to

their oce for e-mail or connection to servers or

resources within the business. The wireless was

probably only available in a limited amount of

locations and was restricted to certain areas of

that location. This meant the risk of interference

or lack of connectivity hardly ever occurred.

Today as that same business user enters the

location of his choice he can spend the next 20

minutes connecting his laptop, tablet, smart

phone and e-reader to the available wireless LAN

internet connection. Then once he has started this

process often he realises that there is insucient

bandwidth and possibly insucient available

associations for him to connect. So why is this?

Overcoming the overcrowding issues

Most installed wireless LAN Networks prior to

2011 operated using the 2.4Ghz Spectrum or

Frequency band. These installations along with

the IEEE 802.11 standard of WLAN as a technology

became prolic with 802.11b and 802.11g

variants as the WLAN standards based technology

market leaders. This alongside the massive install

base of 2.4Ghz clients in the shape of laptops and

now more recently tablets and smart devices

made the choice of which spectrum to use when

designing a wireless network quite simple. The

alternative in more recent years has been the

IEEE 802.11a variant, which utilises the higher

5GHz frequency. Installations were less common

due to interoperability with common client

devices however due to overcrowding in the

2.4Ghz Spectrum and enhancements in WiFi chip

technology the IEEE 802.11a 5Ghz frequency is

signicantly growing in popularity.

WIRELESS

N series Network Diagram

POWE R

12VD C

RESE T

CONSO LE

WDS

WLAN

ETHN

PWR/SYS

POWER

12VDC

RESET

ONSOLE

WDS

WLAN

ETHN

PWR/SY

POWER

12VDC

RESET

ONSOLE

WDS

WLAN

ETHN

PWR/SY

POWER

12VDC

RESET

ONSOLE

WDS

WLAN

ETHN

PWR/SYS

POWER

12VDC

RESET

CONSOL E

WDS

WLAN

ETHN

PWR/SYS

POWER

12VDC

RESET

ONSOLE

WDS

WLAN

ETHN

PWR/SYS

POWER

12VDC

RESET

CONSOL E

WDS

WLAN

ETHN

PWR/SY

POWER

12VDC

RESET

ONSOLE

WDS

WLAN

ETHN

PWR/SYS

POWER

12VDC

RESET

CONSOL E

WDS

WLAN

ETHN

PWR/SYS

WLAN Controller

Redundancy

Assignment

1 + 24

Controller Managed APs

NWA3160-N

802.11 a/b/g/n

Business Access Point

NWA3560-N

802.11 a/b/g/n

Dual Radio Business Access Point

NWA3550-N

802.11 a/b/g/n

Dual-Radio Outdoor

Business Access Point

ZyXEL NWA3550-N

Dual-Radio Outdoor Business Access Point

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ZyXEL Communications PLA-401 - V3.0.5 Spécifications Page 4

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