Mediatrix C7 Series – Digital Gateway
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A PPENDIX
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 www.example.com
might translate to 198.105.232.4.
Dual-Tone Multi-Frequency (DTMF)
In telephone systems, multi-frequency signalling 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 private
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.
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