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Peripherals consumer modems product pcba motherboards assembly electronics contract manufacturing services OEM CEM EMS experience company—China Shenzhen TopscomADSL (asymmetric digital subscriber line) modems, a more recent development, are not limited to the telephone's voiceband audio frequencies. Early proprietary ADSL modems used carrierless amplitude phase (CAP) modulation. All standardized asymmetric DSL variants, including ANSI T1.413 Issue 2, G.dmt, ADSL2, ADSL2+, VDSL2, and G.fast, use discrete multi-tone (DMT) modulation, also called (coded) orthogonal frequency-division multiplexing