DAA: Data Access Arrangement.
DAC: Digital to Analogue Converter.
DAB: Digital Audio Broadcasting.
DACS: Digital Access and Cross-connect System.
daisy chain: Connecting devices together on a network such that signals pass from one device to the next. See also cascaded system.
DAM: DECT Authentication Module.
DAMA: Demand Assignment Multiple Access
D-AMPS: Digital Advanced Mobile Phone System.
DAP: Directory Access Protocol.
DAR: Distributed Adaptive Routeing or Dynamically Adaptive Routeing or Dynamic Alternate Routeing.
dark current: The current which flows in a photodetector when bias is applied to it but no light is incident on it. Usually this current is small and it can vary with external conditions, such as the amount of bias, temperature, ...