FRITZ WLAN 7360 v2 Router Manual PDF (Setup & Configuration Guide)

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Glossary

157

Glossary

ADSL

short for Asymmetric Digital Subscriber Line

ADSL (G.992.1/G992.2) was developed on the basis of DSL

technology in order to satisfy the increasing demand for high-

er throughput rates during uploading and downloading.

designates a fast kind of data transmission that works with

standard copper cables and transports signals in both direc-

tions at different speeds (upstream at 640 Kbit/s and down-

stream at up to 9 Mbit/s).

ADSL2

short for Asymmetric Digital Subscriber Line 2

ADSL2 (G.992.3) is a further development of the ADSL stan-

dard.

ADSL2 offers range much greater than did the first ADSL gen-

eration, and is significantly more robust than ADSL, as it can

simply disable single carrier frequencies when they produce

interference. This feature allows ADSL2 to prevent synchroni-

zation losses.

With a throughput rate of up to 12 Mbit/s downstream,

ADSL2 offers considerably greater bandwidth than ADSL.

ADSL2 is completely downward compatible, meaning that ter-

minal equipment compliant with ADSL can also be operated

on ADSL2 lines, although they cannot exploit the advantages

of ADSL2.

In practice ADSL2 has become less important since the

ADSL2+ standard has made higher throughput rates possible.

ADSL2+

short for Asymmetric Digital Subscriber Line 2 with extended

bandwidth

ADSL2+ (G.992.5) is a further development of the ADSL stan-

dard.

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158

Glossary

ADSL2+ offers a doubled frequency range used for down-

stream transmission, and thus double the maximum band-

width achievable for downstream to 24 Mbit/s.

ADSL2+ is completely downward compatible, meaning that

terminal devices compliant with ADSL and ADSL2 can also be

operated on ADSL2+ lines, although they cannot exploit the

advantages of ADSL2+.

bandwidth management

Bandwidth management distributes the available bandwidth

of an Internet connection among various Internet applica-

tions.

The bandwidth management of the FRITZ!Box ensures that

the speech quality during telephone calls over the Internet is

not reduced by surfing activity. The FRITZ!Box adjusts all up-

loads and downloads to the currently available bandwidth.

Furthermore, the FRITZ!Box grants Internet telephony connec-

tions a higher priority than Internet data connections. This

largely prevents undesired disruptions during Internet tele-

phone calls.

cable modem

A cable modem is a device that transmits data over cable tele-

vision networks. It is used integrate broadband Internet con-

nections over cable connections (cable Internet). The cable

modem is located between the cable connection and the In-

ternet router at the customer’s premises. The computer is

connected either via LAN or the USB port. Some cable mo-

dems are combined with a WLAN access point that establish-

es a radio connection to the computer.

DDNS

short for Dynamic Domain Name System

DDNS is a service which allows a computer always to be

reached under the same domain name despite constantly

changing public IP addresses. This means the home network

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Glossary

159

can always be reached from the Internet, regardless of the

user’s location. Even private users have an economical way of

placing their own Internet offers on their computer at home.

Every time the Internet connection is established, the Internet

Service Provider assigns a new public IP address.

Each time the IP address changes, the current IP address is

transmitted to a special DDNS server. Except for the few sec-

onds between the cancellation of the old IP address and the

notification of the new IP address, the computer can always

be reached at the selected domain name.

DECT

short for Digital Enhanced Cordless Telecommunications

DECT is a European standard for cordless telephony which

was drafted by the European Telecommunications Standards

Institute in 1991 and officially adopted in 1992. DECT defines

the air interface between a mobile handset and its base sta-

tion, and supports both voice transmission and data trans-

mission with flexible transfer speeds.

default gateway

gateway

(

see glossary

)

DHCP

short for Dynamic Host Configuration Protocol

DHCP is a protocol for dynamically negotiating the operating

parameters of the TCP/IP protocol

(

see glossary

). The com-

puters in a local IP network (DHCP clients) access the DHCP

server as part of their operating systems’ start procedure.

The central administration of the TCP/IP operation parame-

ters makes it possible to avoid address conflicts caused by IP

addresses (

see glossary

) accidentally assigned more than

once.

DHCP is used in IPv4 networks (

see glossary

).

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160

Glossary

DHCP server

The DHCP server assigns each client an IP address that is has

not yet been assigned at the present time. The DHCP server

also informs the client of the IP addresses of the DNS server

to be used and of the default gateway. In assigning the IP ad-

dresses the DHCP server selects from a prescribed range of IP

addresses.

DHCP is used in IPv4 networks (

see glossary

).

DNS

short for Domain Name System

Domain Name Service takes care of determining the IP ad-

dress for a given domain name. This Domain Name Service

runs on every computer. It accepts the domain name entered

by a user and inquires about the corresponding IP address at

a DNS server known to the service. If a DNS server cannot an-

swer the inquiry itself, it can inquire about the IP address

(DNS resolution) at other DNS servers.

If the Domain Name Service receives negative information

from the DNS server (domain name not known), it can send

inquiries to other DNS servers it knows or return a corre-

sponding error message to the user. If it receives the desired

IP address instead, the application can use the IP address to

retrieve the destination desired by the user.

This hierarchical system of DNS servers is known as the Do-

main Name System. The addresses of the DNS servers at

which the Domain Name Service is to inquire by default gen-

erally are handed over to the computer by the Internet Service

Provider automatically whenever a connection to the Internet

is established.

download

Download designates the transfer of files from the Internet to

a computer.

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