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Page 111 / 197 Scroll up to view Page 106 - 110
Wireless LAN—Getting Technical
FRITZ!Box 7490
111
Wireless Auto Channel
With the wireless auto channel function, the FRITZ!Box auto-
matically searches for the channel subject to the least inter-
ference. This process takes into consideration interference
from radio networks in the vicinity (wireless access points)
and potential sources of interference (for instance video
bridges, baby monitors, microwave ovens). Should problems
with interference persist despite this function, try to identify
the source of interference and switch it off manually.
5-GHz Frequency Band
The FRITZ!Box can operate in parallel in the 5-GHz frequency
band. This frequency range is used much less often than the
most common 2.4-GHz frequency range.
In the 5-GHz frequency band the FRITZ!Box supports automat-
ic channel switching by DFS (Dynamic Frequency Selection).
DFS ensures that the channels from 52 to 140 are kept free
for higher-priority users, like weather radar systems. If you
are operating your FRITZ!Box in one of these channels, it mon-
itors the selected channel periodically for higher-priority us-
ers, and, if necessary, switches to a different channel. Note
that the FRITZ!Box waits up to ten minutes, as legally re-
quired, before occupying a free channel. During this period
you cannot register any wireless devices. The wireless LAN
connection is then established automatically.
A prerequisite for use of the 5-GHz frequency band is that
wireless devices used in the network support this frequency
range in accordance with the IEEE 802.11a, IEEE 8002.11n or
IEEE 802.11ac standard.
In the 5-GHz frequency band, two large ranges of frequencies
can be used: 5.15 GHz to 5.35 GHZ, and 5.47 GHz to
5.805 GHz. In the EU, up to 19 channels are available in these
areas:
5150—5350 MHz (channels 36, 40, 44, 48, 52, 56, 60 and
64)
5470—5725 MHz (channels 100, 104, 108, 112, 116, 120,
124, 128, 132, 136 and 140)
Different conditions may apply for the individual ranges.
Page 112 / 197
FRITZ!Box 7490
112
Wireless LAN—Getting Technical
2.4 GHz and 5 GHz
The FRITZ!Box works in the wireless network in the 2.4-GHz
range and parallel in the 5-GHz range. Both frequency ranges
can be used simultaneously for wireless LAN connections.
This means you always have the optimum data connection at
your disposal:
For applications that rely on a steady, high throughput rate
(“streaming”), use the 5-GHz frequency band. This radio
band provides more channels, and these channels do not
overlap, as well as experiencing significantly less external in-
terference.
For applications that require a low to normal throughput rate
(for instance, reading and writing e-mail), use the 2.4-GHz fre-
quency band.
Bandwidth
Depending on which generation of the IEEE 802.11n standard
is used, the FRITZ!Box can transport 300 to 450 Mbit/s over
wireless LAN. Up to 1300 Mbit/s are possible with the
IEEE 802.11ac standard. If not enough space is available in
the radio spectrum to allow interference-free transmission on
the channel with bandwidth of 40/80 MHz, the FRITZ!Box au-
tomatically reduces bandwidths to 20/40 MHz (“fallback”)
with a correspondingly lower transmission capacity.
For connections in accordance with the 802.11ac standard
with three separate data streams (three antennas), higher da-
ta throughput can be achieved with greater bandwidth:
Standard
Channel Bandwidth (MHz)
802.11ac
Automatic selection of 20, 40 or 80
802.11n
Automatic selection of 20 or 40
802.11a
20 (always)
Bandwidth (MHz)
Maximum Data Throughput (Mbit/s)
20
216
40
450
80
1300
Page 113 / 197
Wireless LAN—Getting Technical
FRITZ!Box 7490
113
Increasing bandwidths also increases the probability of inter-
ference by wireless networks in the vicinity. Large bandwidths
reduce the frequency range available to other wireless net-
works in the vicinity.
Allocation of the Wireless LAN Channels in the 2.4-GHz Range
Allocation of the Wireless LAN Channels in the 5-GHz Range
Channel
Frequency (GHz)
Channel
Frequency (GHz)
1
2.412
8
2.447
2
2.417
9
2.452
3
2.422
10
2.457
4
2.427
11
2.462
5
2.432
12
2.467
6
2.437
13
2.472
7
2.442
Channel
Frequency (GHz)
Channel
Frequency (GHz)
36
5.18
108
5.54
40
5.20
112
5.56
44
5.22
116
5.58
48
5.24
120
5.60
52
5.26
124
5.62
56
5.28
128
5.64
60
5.30
132
5.66
64
5.32
136
5.68
100
5.50
140
5.70 (20 MHz band-
width only)
104
5.52
Page 114 / 197
FRITZ!Box 7490
114
FRITZ!Box as a Telephone System
16
FRITZ!Box as a Telephone System
This chapter describes how to use the FRITZ!Box as a telephone sys-
tem.
16.1
Telephone Book
How Can I Use the Telephone Book?
•
Quick-dial: With quick-dial numbers you assign in the
telephone book entries you can make calls on all tele-
phones.
•
FRITZ!Fon: The telephone book is available in the menu
of your FRITZ!Fon cordless telephones. You can set up a
separate telephone book for each FRITZ!Fon.
•
Click to Dial: With Click to Dial you can place calls by just
clicking telephone book entries with the mouse.
Creating a New Telephone Book Entry
1.
Open the FRITZ!Box user interface, see
page 32
.
2.
Select “Telephony / Telephone Book”.
3.
Click “New Entry”.
4.
Enter the information on the contact.
In the first telephone book you can also enter a quick-
dial number.
In the Help of the FRITZ!Box user interface
you can
find detailed instructions.
5.
Save with “OK”.
Creating a New Telephone Book for FRITZ!Fon
1.
Open the FRITZ!Box user interface, see
page 32
.
2.
Select “Telephony / Telephone Book”.
3.
Click the “New Telephone Book” link.
4.
Select “Create as new”.
Page 115 / 197
Telephone Book
FRITZ!Box 7490
115
5.
Under “Telephone Assignment”, select all FRITZ!Fon
cordless telephones on which you would like to use the
telephone book.
6.
Save with “OK”.
The telephone book is available in the menu of the FRITZ!Fon
cordless telephones.
Configuring Online Telephone Books (e.g. Google
Contacts)
1.
Open the FRITZ!Box user interface, see
page 32
.
2.
Select “Telephony / Telephone Book”.
3.
Click the “New Telephone Book” link.
4.
Select “Use the telephone book of an e-mail account”.
5.
Select a provider and enter the e-mail address and pass-
word.
6.
Under “Telephone Assignment”, select all FRITZ!Fon
cordless telephones on which you would like to use the
telephone book.
7.
Save with “OK”.
8.
For Google contacts you can also select contact groups.
In the Help of the FRITZ!Box user interface
you can
find detailed instructions.
The telephone book is available in the menu of the FRITZ!Fon
cordless telephones.
Synchronizing Online Contacts
The FRITZ!Box automatically synchronizes the telephone
book in the FRITZ!Box with the online telephone book every
24 hours.
You can also synchronize the telephone books at any time
with the click of a button.
In the Help of the FRITZ!Box user interface
you can find
detailed instructions.

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