250 List of termsDNDirectory Number.DRAMDynamic Random Access Memory. A high density type of semi-conductormemory. It typically has slower access time than SRAM and requiresexternal memory refresh circuitry.DSPDigital Signal Processing. A specialized computer chip that performs speedyand complex operations on digitized waveforms. Useful in processing soundand video.DTMFDual Tone Multi-frequency. A term describing push-button or touch-tonedialing.EMCElectro-Magnetic Compatibility. Refers to equipment units that performtheir functions without causing or suffering unacceptable electromagneticinterference from other equipment in the same environment.EMIElectro-Magnetic Interference. Unwanted electromagnetic coupling, such asa ham radio heard on an electric organ or church music heard in hearingaids. Also known as "static".FirmwareHardwired logic, software, data, and programming instructions such as thatstored by threading wires through ferrite cores. May also refer to softwareprogrammed in the factory or burnt in the field, and is semi-permanentlystored within ROM.Flash memoryElectrically erasable memory that is non-volatile (not affected by powerdisruptions).FTPFile Transfer Protocol.HTTPHypertext Transfer Protocol.ICBIntegrated Conference Bridge.Nortel Communication Server 1000/Communication Server 2100 Solution/Meridian SL-100Nortel Integrated Conference Bridge: Service Implementation FundamentalsNN43001-558/555-4001-135 01.02 StandardICB Release 4 20 June 2007Copyright © 2007, Nortel Networks.
