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Gateway
Connects two different Networks with one another, e.g. router as Internet gateway.
For phone calls from VoIP to the telephone network, a gateway has to be connected to
the IP network and the telephone network (gateway/VoIP provider). It forwards calls
from VoIP to the telephone network as required.
Gateway Provider
See SIP provider.
Global IP Address
See IP address.
GSM
Global System for Mobile Communication
Originally, European standard for mobile networks. GSM can now be described as a
worldwide standard. In the USA and Japan national standards are now more frequently
supported than in the past.
H
Headset
Combination of microphone and headphone. A headset makes handsfree talking more
comfortable. There are headsets available which are connected to the handset by a
cable.
HTTP Proxy
Server via which the Network subscribers can process their Internet traffic.
Hub
Uses one Infrastructure network to connect several Network subscribers. All data
sent to the hub by one network subscriber is forwarded to all network subscribers.
See also: Gateway, Router.
I
IEEE
Institute of Electrical and Electronics Engineers
International body that defines standards in electronics and electrotechnology, con-
cerned in particular with the standardisation of LAN technology, transmission protocols,
data transfer rate and wiring.
Infrastructure network
Network with central structure: all Network subscribers communicate via a central
Router.
Internet
Global WAN. A series of protocols have been defined for exchanging data, known by the
name TCP/IP.
All Network subscribers can be identified by their IP addresses. DNS assigns a Domain
name to the IP address.
Important services on the Internet include the World Wide Web (WWW), e-mail, file
transfer and discussion forums.
Internet Service Provider
Enables access to the Internet for a fee.
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