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- A basic group of Pulse Code Modulation (PCM) channels assembled by Time Division Multiplex. In the United States it usually consists of 24 channels at 1.544 Mbs.
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- adaptive differential pulse-code modulation (ADPCM), carrier (cxr), chirping, digital modulation, hop, multipulse test signal, pulse-amplitude modulation (PAM), pulse carrier, pulse-duration modulation (PDM), pulse-frequency modulation (PFM), pulse-interval modulation, pulse-length modulation, pulse link repeater (PLR), pulse-position modulation (PPM), pulse-repetition-rate modulation, pulse-time modulation (PTM), pulse-width modulation (PWM), pulsed FM systems, sub-band adaptive differential pulse code modulation (SB-ADPCM)