Siemens ADSL C-110 Quick Start Manual page 21

Domain name system. This is not an actual internet protocol, but a system for translating
node names (for example www.nasa.org) into numerical addresses (for example
192.168.2.1).
DSL
Digital Subscriber Line. Network Technology that transmits using a broad bandwidth over
short distances using traditional telephone copper pairs. There are four types of DSL: ADSL,
HDSL, SDSL and VDSL. Each of these uses two specific devices (similar to modems) at each
end of the transmission. As most ADSL technology does not use all of the bandwidth available
on the copper pair, there is space for a voice channel (for example: for normal telephone
calls). See also ADSL, HDSL, SDSL and VDSL.
FTP
File Transfer Protocol. Principal element of the group (TCP/IP) of Internet protocols, used to
transfer files from Internet servers to user computers.
IPoA (RFC 1577)
Classical IP over ATM.
ISP
Internet Service Provider. Company that manages Internet access. It is possible to access the
Internet by connecting your computer (via a modem or router) to an ISP server, using special
T1 telephone lines. A peer-to-peer (point-to-point) connection is used with the bandwidth of
1.5 Mbps divided into 24 channels of 64 kb each. The larger ISPs may have several T1 lines.
ISPs often offer additional services such as hosting & housing, e-commerce solutions and sup-
port to their customers.
LAN
Local Area Network. Network or group of network segments confined to a building or campus
that connects computers and peripherals (such as printers, faxes and scanners) installed at
the same location (for example: same building, including on different floors) or at neighbor-
ing locations (for example: two adjacent buildings). LANs usually work at high speed, for
example: Ethernet has a data transfer speed of 10 Mbps or 100 Mbps in the case of Fast
Ethernet. Compare WAN.
MAC
Media Access Control. The MAC is a radio control protocol in a wireless LAN (WLAN) network
card. It corresponds to level 2 – OSI reference model data link layer. IEEE standard 802.11
specifies the MAC protocol for the division of physical resources, formats and the addressing
of packets and identification of errors.
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