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ADM Last modified: Wednesday, September 05, 2001
Short for add/drop multiplexing, a multiplexing function used in SONET optical technology but can also be used in electric signal transmissions. ADM allows new signals to come in and existing signals to be dropped from a carrier channel by passing through an add/drop multiplexer. The goal of ADM is to add and drop signals without disrupting the onward transmission of other signals.
	Related Categories Multiplexing Related Terms CDMA demultiplex EDFA FDM modulate multiplex multiplexer pulse code modulation SONET T-1 carrier T-3 carrier TDMA WCDMA WDM