The signal level at a receiver input terminal, such as the input terminal of a computer, a radio receiver, or a photodetector. Common abbreviationRSL.Note 1: The signal bandwidth and the established reference level must be specified. Note 2: The received signal level (RSL) usually is expressed (a) in dB with respect to one milliwatt (1 mW), i.e., with respect to zero (0) dBm for electronic signals and (b) in dB with respect to one microwatt (1 μW), i.e., with respect to zero (0) dBμW for optical signals. See also bandwidth,  computer,  dB,  dBm,  dBμ W,  electronic signal,  input,  level,  microwatt,  milliwatt,  optical power,  optical signal,  photodetector,  power level,  radio receiver,  receive,  receiver,  reference level,  signal,  signal level,  specify,  terminal,  zero.