18 Glossary
This describes the most important terms and abbreviations of this manual.
APN: Access Point Name, computer name that provides cellular subscribers
of the GPRS network with Internet access.
AT command: Commands to devices such as modems to set up this device.
Broadcast: Data packet that is sent to all participants of a network.
Caller ID: Phone number transmitted by the caller that can be evaluated by the
called device.
Client: Device that requets services from another device (server).
CLIP: Calling Line Identification Presentation is a service feature for incom-
ing calls in analogue and ISDN telephone networks as well as cellular
radio. The caller ID of the caller is transmitted to the recipient.
CHAP: Challenge Handshake Authentication Protocol; an authentication pro-
tocol often used for PPP connections.
DHCP: Dynamic Host Configuration Protocol; DHCP servers can dynamically
design an IP address and other parameters to DHCP clients on re-
quest.
Dial-in: The device can be called via a dial-in connection and then create a
connection to the LAN.
Dial-out: The device can use a dial-up connection to make calls and establish In-
ternet connections, for example.
DFÜ: Datenfernübertragung (remote data transmission); data can be ex-
changed between computers over considerable distances. The trans-
mission is often realised with modems and the PPP protocol.
DNS: Domain Name System; service used for the translation of domain
names into IP addresses.
Domain name: The domain is the name of an Internet site (e.g. insys-icom). It
consists of the name and an extension (Top Level Domain, e.g. .com),
(e.g. insys-icom.com).
EDGE: Enhanced Data Rates for GSM Evolution designates a technology for
increasing the data rate in GSM cellular networks by introducing an
additional modulation process. EDGE enhances GPRS to E-GPRS (En-
hanced GPRS) and HSCSD to ECSD.
Firewall: Network rules that block in particular data packets to certain sources
or destinations.
Gateway: This is a machine that works like a -> Router. In contrast to the router,
a gateway can also route data packets from different hardware net-
works.
GPRS: General Packet Radio Service; advancement of the -> GSM cellular
network to achieve higher data transmission rates.
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