Example image of eyePlorer eyePlorer map for 'Modem': Carrier wave Demodulation Digital Modulation Peripheral Signal (electronics) Data Analog signal Diode Radio Binary numeral system Plain old telephone service Telephone line Bit rate Baud Frequency-shift keying International Telecommunication Union ITU-T V-Series Recommendations Phase-shift keying V21 Cable modem DSL modem Microwave Serial communication Telecommunication Radio modem Optical fiber Wavelength-division multiplexing Submarine communications cable Data rate units Kibibyte Kilobyte Duplex (telecommunications) Hertz ASR-33 Teletype IBM 2741 AT&T Acoustic coupler Lawrence Livermore National Laboratory Novation CAT Hush-A-Phone v. United States United States United States Court of Appeals for the District of Columbia Circuit Carterfone Hayes Microcomputer Products Hayes command set Bulletin board system Fax Image file formats Computer software