Specifications
Appendix C - Glossary Administration Manual (SIP/MGCP Version)
AT-VP504E FXS 131
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.
Electronically
Erasable
Programmable Read
Only Memory
(EEPROM)
A read only memory device which can be erased and reprogrammed.
Typically, it is reprogrammed electronically (not electromagnetically)
with ultraviolet light.
Erasable
Programmable Read
Only Memory
(EPROM)
EPROM is a special type of memory that retains its contents until it is
exposed to ultraviolet light. The ultraviolet light clears its contents,
making it possible to reprogram the memory. To write to and erase an
EPROM, you need a special device called a PROM programmer or
PROM burner.
Far End Disconnect This term 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, and 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. A FXS line is normally connected to a standard
telephone, fax or modem.