FRITZ WLAN 7490 Router Manual PDF (Setup & Configuration Guide)

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106

Wireless LAN—Getting Technical

IEEE 802.11a

Because this standard works exclusively in the seldom used

5-GHz range, it offers the opportunity to transmit data rela-

tively free of interference from external influences. Wireless

devices that support 802.11a are much less common than

devices that work in accordance with the 802.11b/g stan-

dard.

IEEE 802.11b

With a maximum throughput rate of 11 Mbit/s, this is the old-

est wireless standard. Older wireless devices of the first gen-

eration can communicate with the FRITZ!Box using 802.11b.

However, if the wireless device supports newer standards

such as 802.11g, the latest standard should be used.

IEEE 802.11g

In this wireless LAN standard data are transmitted in the 2.4-

GHz range at a maximum gross throughput of 54 Mbit/s. This

standard is compatible with a wide range of wireless devices.

However, due to heavy use of the 2.4-GHz range, interference

is more common than in the less-used 5-GHz range.

IEEE 802.11n

This standard allows for high throughput rates and ranges.

The FRITZ!Box supports 802.11n in the 2.4-GHz frequency

band, and parallel in the 5-GHz frequency band. Modulation

processes and antenna techniques like MIMO (Multiple In-

put, Multiple Output) use whichever frequency band is avail-

able more effectively than the older standards.

Thanks to compatibility with the 802.11g standard, you can

also continue to use older wireless devices.

The use of the 802.11n standard—and thus the availability

of higher throughput rates—is possible only if the wireless

LAN connection is secured using the WPA2 security mecha-

nism (AES-CCMP).

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Wireless LAN—Getting Technical

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107

IEEE 802.11ac

This standard provides for transmission rates in the gigabit

range. The high throughput rates are achieved using wider

wireless LAN channels, deeper modulation and more MIMO

streams. Channels can be 20, 40, or 80 MHz wide. Modula-

tions of up to 8 bit/256QAM are applied. The standard uses

only the 5-GHz range, which reduces interference with other

users.

The standard is compatible with the 802.11a and 802.11n

standards, which means it can be used with older wireless

devices.

The FRITZ!Box 7490 has a second access point responsible

for the 2.4-GHz range. This allows wireless devices compati-

ble with the 802.11b/g/n to be used as well.

Setting the Right Standard in the FRITZ!Box

The throughput rate that can be achieved in your wireless ra-

dio network depends on the wireless standards used by the

integrated wireless devices. These wireless standards must

also be set in the FRITZ!Box. Proceed as follows to check

which wireless LAN standards are set and change them if

needed:

1.

Open the FRITZ!Box user interface, see

page 32

.

2.

Enable the advanced view.

3.

Open “WLAN / Radio Channel” and select which wireless

LAN standards should be used for both frequency

bands.

Note the following for the configuration of this setting:

•

Your FRITZ!Box 7490 can make two wireless networks

available simultaneously for data transmission. One of

the wireless radio networks works in the 2.4-GHz fre-

quency band, and the other in the 5-GHz frequency

The use of the 802.11ac standard—and thus the availability

of higher throughput rates—is possible only if the wireless

LAN connection is secured using the WPA2 security mecha-

nism (AES-CCMP).

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Wireless LAN—Getting Technical

band. This means the FRITZ!Box can be implemented as

an especially flexible wireless access point for the vari-

ous wireless devices and applications in your network.

•

Set the standards of the two wireless radio networks in

the FRITZ!Box such that they are compatible with all of

the wireless LAN devices used in the wireless network.

Make a note of which standards the wireless devices in your

network are compatible with and then adjust the FRITZ!Box

settings according to the following information:

11n, 11g

In your radio network there are wireless LAN devices that are

compatible with one or both of the following standards:

•

802.11n

•

802.11g

In this case set the wireless LAN standard for the 2.4-GHz fre-

quency band to: 802.11n+g

11g, 11b

In your radio network there are wireless LAN devices that are

compatible with one or both of the following standards:

•

802.11g

•

802.11b

In this case set the wireless LAN standard for the 2.4-GHz fre-

quency band to: 802.11b+g

11n, 11g, 11b

In your radio network there are wireless LAN devices that are

compatible with one or all of the following standards:

•

802.11n

•

802.11g

•

802.11b

In this case set the wireless LAN standard for the 2.4-GHz fre-

quency band to: 802.11n+b+g

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Wireless LAN—Getting Technical

FRITZ!Box 7490

109

11n, 11a

In your radio network there are wireless LAN devices that are

compatible with one or both of the following standards:

•

802.11n

•

802.11a

Set the wireless LAN standard for the 5-GHz frequency band

to: 802.11n+a

11ac

In your radio network there are wireless devices that support

the 802.11ac standard:

Set the wireless LAN standard for the 5-GHz frequency band

to: 802.11ac

An unused frequency band can be disabled in the FRITZ!Box

in order to reduce energy consumption without losing wire-

less LAN connections.

The Standard for Security

IEEE 802.11i

The WPA2 security mechanism is defined in the IEEE 802.11i

standard. WPA2 is an extension of the familiar security mech-

anism WPA (Wi-Fi Protected Access).

The main feature of the extension of WPA to WPA2 is the AES-

CCMP encryption process.

Mechanism

Encryption

WPA

TKIP (Temporary Key Integrity Protocol)

WPA2

TKIP

AES-CCMP

based on the extremely secure AES (Advanced

Encryption Standard) procedure. CCMP

(Counter Mode with CBC-MAC Protocol) de-

fines how the AES procedure is applied to

wireless LAN packets.

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Wireless LAN—Getting Technical

FRITZ!Box supports the AES encryption procedure as part of

the WPA2 mechanism, and the TKIP encryption procedure as

part of the WPA mechanism. This means that the FRITZ!Box

can be used in combination with any wireless devices that al-

so support WPA2 with AES or WPA with TKIP.

Frequency Ranges

Wireless LAN uses the frequency ranges at 2.4 GHz and 5 GHz

for transmission.

With the FRITZ!Box 7490 you can establish wireless LAN con-

nections in both frequency ranges at the same time.

2.4-GHz Frequency Band

In the 2.4-GHz frequency band wireless LAN works in the

same range as Bluetooth, microwave devices and various

other devices like radio-controlled toys, garage-door openers

and video bridges. This means that interference may occur

within wireless networks operated in the vicinity of such de-

vices. Generally this has adverse effects on the transmission

rate, including aborted connections.

A channel can have a bandwidth of 20 MHz (throughput of up

to 216 Mbit/s) or 40 MHz (throughput of up to 450 Mbit/s).

Channels located directly next to each other in the 2.4-GHz

band may overlap and result in mutual interference. For in-

stance, if several wireless networks are operated close to

each other in the 2.4-GHz frequency range with a bandwidth

of 20 MHz, a distance of at least five channels should be left

empty between each two channels used. This means that if

channel 1 is selected for one wireless network, the

channels 6 through 13 can be selected for a second wireless

network. This maintains the minimum distance between

channels.

Should interference in a wireless network persist, the first

step should be to select a different channel.

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