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International body that develops worldwide standards for telecommunications technologies.
LAN (local-area network)
LANs connect workstations, servers, terminals, printers and other devices in a single building or
other geographically limited area. LANs use special operating systems to transmit data at high
speeds. Several LANs form wide area networks (WAN).
LTU
Line termination unit.
MSDL (Multispeed DSL)
Special method of DSL structure, allowing to adapt the information exchange speed and
bandwidth frequency of the line signal depending on the line quality and length.
NTU
Network termination unit.
PVC
Private virtual circuit.
POTS (Plain old telephone service)
International term for analog telephone lines.
RJ11
Four- or six-pin connector, used for telephone connections and fax machines and other types of
network analog connections.
RJ45
Eight-pin connector used in LANs and data transmission systems.
RS232
EIA standard for 25-pin (simpler version – 9-pin) interface used to connect computers or
terminals with communication equipment (modem, fax, etc.).
SDSL (Symmetric Digital Subscriber Line)
Symmetrical DSL provides high-speed (0.1…2048 Mbit/s and more) bi-directional transmission
over one twisted pair. The transmission rates in both directions are equal.
SNMP (Simple Network Management Protocol)
Network administration protocol, which is widely used nowadays. The network management is
included in the TCP/IP stack.
Splitter
Devices representing a combination of filters and allowing transmitting analog telephone signals
together with digital data.
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