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Acronyms begining with I IDCT   Inverse Discrete Cosine Transform IDFT   Inverse Discrete Fourier Transform IEEE   Institute of Electrical and Electronics Engineers IF   Intermediate Frequency IFFT   Inverse Fast Fourier Transform IGA   Improved Gaussian Approximation IIR   Infinite Impulse Respone IM   Intermodulation IMFET   Internally Matched Field Effect Transistor IMSI   International Mobile Subscriber Identity IMT-2000   International Mobile Telecommunication 2000 IMTS   Improved Mobile Telephone Service IP   Internet Protocol IP3   Third Order Intercept Point IS-54   EIA Interim Standard for US Digital Cellular Time Division Multiple Access (TDMA) IS-95   EIA Interim Standard for US Digital Cellular Code Division Multiple Access (CDMA) IS-136   EIA Interim Standard 136 US Digital Cellular (USDC) w/ Digital Control Channels ISDN   Integrated Services Digital Network ISI   Intersymbol Interference ISM   Industrial, Scientific, and Medical ISUP   ISDN User Part ITFS   Instructional Television Fixed Service ITU   International Telecommunications Union IXC   Interexchange Carrier

this page last updated: 1 October 1999