TA7102 Hardware Installation
153/1531-ANF 901 14 B 2017-03-08
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A standard describing software that keeps track of the Internet’s addresses for different nodes, routes
outgoing messages, and recognizes incoming messages.
Light Emitting Diode (LED)
A semiconductor diode that emits light when a current is passed through it.
Local Area Network (LAN)
Data-only communications network confined to a limited geographic area, with moderate to high data
rates. See also WAN.
Media Access Control (MAC) Address
A layer 2 address, 6 bytes long, associated with a particular network device; used to identify devices in
a network; also called hardware or physical address.
Network
A group of computers, terminals, and other devices and the hardware and software that enable them
to exchange data and share resources over short or long distances. A network can consist of any
combination of local area networks (LAN) or wide area networks (WAN).
Private Branch Exchange (PBX)
A small to medium sized telephone system and switch that provides communications between onsite
telephones and exterior communications networks.
Protocol
A formal set of rules developed by international standards bodies, LAN equipment vendors, or groups
governing the format, control, and timing of network communications. A set of conventions dealing
with transmissions between two systems. Typically defines how to implement a group of services in
one or two layers of the OSI reference model. Protocols can describe low-level details of machine-to-
machine interfaces or high-level exchanges between allocation programs.
Public Switched Telephone Network (PSTN)
The local telephone company network that carries voice data over analog telephone lines.
Router
A specialized switching device which allows customers to link different geographically dispersed local
area networks and computer systems. This is achieved even though it encompasses different types of
traffic under different protocols, creating a single, more efficient, enterprise-wide network.
Switched Circuit Network (SCN)
A communication network, such as the public switched telephone network (PSTN), in which any user
may be connected to any other user through the use of message, circuit, or packet switching and
control devices.
