Media5 Mediatrix 4104, Reference Manual, Page: 440 / 466

Appendix E - Glossary Country Code (CC)
418 Mediatrix 4104
In this context, the area code corresponds to the Z portion of the numbering plan. Because virtually every
country has a different dialing plan nomenclature, it is recommended to identify the equivalent of an area code
for the location of your communication unit.
Country Code (CC)
In international direct telephone dialing, a code that consists of 1-, 2-, or 3-digit numbers in which the first digit
designates the region and succeeding digits, if any, designate the country.
Custom Local Area Signalling Services (CLASS)
One of an identified group of network-provided enhanced services. A CLASS group for a given network usually
includes several enhanced service offerings, such as incoming-call identification, call trace, call blocking,
automatic return of the most recent incoming call, call redial, and selective forwarding and programming to
permit distinctive ringing for incoming calls.
Digital Signal Processor (DSP)
Specialized computer chip designed to perform speedy and complex operations on digitized waveforms.
Useful in processing sound (like voice phone calls) and video.
Digital Subscriber Lines (DSL)
A technology for bringing high-bandwidth information to homes and small businesses over ordinary copper
telephone lines. xDSL refers to different variations of DSL, such as ADSL, HDSL, and RADSL.
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.
Echo Cancellation
Technique that allows for the isolation and filtering of unwanted signals caused by echoes from the main
transmitted signal.
Far End Disconnect
Refers to methods for detecting that a remote party has hung up. This is also known as Hangup Supervision.
There are several methods that may be used by a PBX/ACD/CO to signal that the remote party has hung up,
including cleardown tone, or a wink.
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.