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RAM RAM stands for "Random Access Memory" and refers to a computer's working memory.
Unlike a hard disk, RAM does not provide permanent storage. The data remains in the
RAM until the power supply is disconnected.
S0 bus for ISDN The S0 bus is an internationally standardised 4-wire bus which is connected downstream
of the NTBA (Network Termination for Basic Access) adapter and is responsible for the
connection of ISDN terminal devices. The S0 bus supports up to 12 connection sockets
and up to 8 ISDN terminal devices, though only 4 ISDN terminal devices without independ-
ent power supplies can be connected at the same time.
Server A server is a computer that provides applications and documents which are available to
other computers (clients).
SIM card SIM cards are phone cards for mobile phones. SIM cards are needed to make mobile
phone calls as a subscriber on a GSM network. The SIM card identifies the subscriber and
allows billing and usage logging.
Splitter A splitter separates speech traffic (e.g. telephone) from data traffic. An ADSL modem or
router can be plugged into the data traffic interface.
Subnet mask The subnet mask defines the size of a TCP/IP subnet. A subnet is created by dividing all
IP addresses into sub-networks.
DNS:
The Domain Name System is a naming scheme for computers connected to the Internet.
DNS naming is far more user-friendly than an IP address, as real names are easier to re-
member than abstract sequences of numbers. Name servers automatically convert DNS
addresses into the numerical IP address which is needed to forward the data packages.
TCP/IP TCP/IP is the standard Internet protocol and stands for "Transmission Control Protocol /
Internet Protocol". The Internet protocol defines the transmission path for the data packets.
The TCP sub-protocol ensures that all the sent bytes can be received correctly.
UMTS The term "Universal Mobile Telecommunications System" is better known by its abbrevia-
tion UMTS. UMTS is the 3rd generation mobile phone standard which allows significantly
higher data transfer rates than the GSM standard.
WCDMA Wideband CDMA (WCDMA) is a CDMA process (CDMA: Code Division Multiple Access),
whereby the transmitted signal has greater bandwidth and so is less vulnerable to narrow-
band interference. This also makes it possible to increase the transmission power per Hz.
WCDMA is used with UMTS, for example.
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