238 List of terms
553-3001-358/555-4001-135 Standard 02.00 July 2006
DRAM
Dynamic Random Access Memory. A high density type of
semi-conductor memory. It typically has slower access time than
SRAM and requires external memory refresh circuitry.
DSP
Digital Signal Processing. A specialized computer chip that performs
speedy and complex operations on digitized waveforms. Useful in
processing sound and video.
DTMF
Dual Tone Multi-frequency. A term describing push-button or
touch-tone dialing.
EMC
Electro-Magnetic Compatibility. Refers to equipment units that
perform their functions without causing or suffering unacceptable
electromagnetic interference from other equipment in the same
environment.
EMI
Electro-Magnetic Interference. Unwanted electromagnetic coupling,
such as a ham radio heard on an electric organ or church music
heard in hearing aids. Also known as “static”.
Firmware
Hardwired logic, software, data, and programming instructions such
as that stored by threading wires through ferrite cores. May also refer
to software programmed in the factory or burnt in the field, and is
semi-permanently stored within ROM.
Flash memory
Electrically erasable memory that is non-volatile (not affected by
power disruptions).
FTP
File Transfer Protocol.
HTTP
Hypertext Transfer Protocol.
ICB
Integrated Conference Bridge.
IP
Internet Protocol.
IPE
Intelligent Peripheral Equipment. A range of cards that contain micro-
processors that provide off-loading of the CPU function and the