TA7104 /7108 Hardware Installation
155/1531-ANF 90114 C 2017-03-08
25
7
APPENDIX C - GLOSSARY
10 BaseT
An Ethernet local area network that works on twisted pair wiring.
100 BaseT
A newer version of Ethernet that operates at 10 times the speed of a 10 BaseT Ethernet.
Domain Name Server (DNS)
Internet service that translates domain names into IP addresses. To use a domain name, a DNS
service must translate the name into the corresponding IP address. For instance, the domain name
might translate to 198.105.232.4.
Dual-Tone Multi-Frequency (DTMF)
In telephone systems, multi-frequency signaling in which a standard set combinations of two specific
voice band frequencies, one from a group of four low frequencies and the other from a group of four
higher frequencies, are used. Although some military telephones have 16 keys, telephones using
DTMF usually have 12 keys. Each key corresponds to a different pair of frequencies. Each pair of
frequencies corresponds to one
of the ten decimal digits, or to the symbol “#” or “*”, the “*” being
reserved for special purposes.
Dynamic Host Configuration Protocol (DHCP)
TCP/IP protocol that enables PCs and workstations to get temporary or permanent IP addresses (out
of a pool) from centrally-administered servers.
Federal Communications Commission (FCC)
U.S. government regulatory body for radio, television, interstate telecommunications services, and
international services originating in the United States.
Foreign Exchange Service/Station (FXS)
A network-provided service in which a telephone in a given local exchange area is connected, via a
pr
ivate line, to a central office in another, i.e., “foreign”, exchange, rather than the local exchange
area’s central office. This is the station (telephone) end of an FX circuit. An FXS port will provide dial
tone and ring voltage.
International Telecommunication Union (ITU)
Organization based in Geneva, Switzerland, that is the most important telecom standards-setting body
in the world.
Internet Protocol (IP)
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)
