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Glossary
86 1/1551-CRH 102 168 Uen Rev A 2008-12-16
calling line identity,for example the phone
number, of the caller.
DHCP – Dynamic Host Configuration
Protocol
A protocol used by networked computers
(clients) to obtain IP addresses and other
parameters such as the default gateway,
subnet mask, and IP addresses of DNS
servers from a DHCP server.
DHCP server
A configuration server, capable of configuring
network devices with a variety of information,
such as IP addresses, required for their
operation.
DNS – Domain Name System (or Service)
The distributed name/address mechanism
used in the Internet. It comprises distributed
online databases that contain mappings
between human-readable names and IP
addresses, and servers, which provide
translation services to client applications.
DTMF – Dual Tone Multi Frequency
The telephone signaling method used over
the line in the voice-frequency band to the call
switching center. The version of DTMF used
for telephone “tone dialing” is known by the
trademarked term “Touch-Tone”.
EDGE – Enhanced Data rates for Global
Evolution
A technology that gives GSM the capacity to
handle services for the third generation of
mobile telephony. EDGE provides three times
the data capacity of GPRS.
Encryption
Encryption is an effective way to achieve data
security by translating data into a secret code.
Encryption key
A sequence of characters used for data
encryption. The encrypted data can only be
sent and received by users with access to the
encryption key.
Ethernet
The most common LAN technology, used in
wired networks.
FTP – File Transfer Protocol
A protocol for exchanging files over the
Internet. FTP is most commonly used to
download and upload files from and to
servers.
Gateway
A network point that acts as an entrance to
another network.
GPRS – General Packet Radio Service
A packet-based mobile communications
system building on GSM. Advantages over
standard GSM include higher data
transmission speeds, more efficient use of
radio resources and continuous connection to
the network to facilitate more advanced non-
voice services.
GSM – Global System for Mobile
Communication
The second generation mobile system
originally developed in Europe. GSM is
oriented to voice and circuit mode data.
Host
A device (usually a computer) that is
connected to a TCP/IP network, including the
Internet. Each host has a unique IP address.
Host name
The DNS name of a device on a network,
used to simplify the process of locating
computers on a network.
HSPA – High Speed Packet Access
A mobile broadband technology that improves
the performance of networks based on the
Universal Mobile Telecommunications
System (UMTS).
IGD – Internet Gateway Device
See UPnP IGD.
IEEE – Institute of Electrical and