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- A device that interfaces concatenated E&M signal paths. Note 1: A PLR converts a ground, received from the E lead of one signal path, to -48 Vdc, which is applied to the M lead of the concatenated signal path. Note 2: In many commercial carrier systems, the channel bank cards or modules have a "PLR" option that permits the direct connection, i.e., concatenation, of E&M signaling paths, without the need for separate PLR equipment.
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- adaptive differential pulse-code modulation (ADPCM), carrier (cxr), chirping, Di Group, 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-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)