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Glossary
Distributed Function Terminal (DFT) 1) A protocol used for communication between a terminal and an IBM 3270 or IBM 3174 control unit that allows multiple concurrent logical terminal sessions. 2) A mode of operation that uses this protocol.
DLC See data link control.
DLCI See data link control identifier.
DMA (Direct Memory Access) A fast method of moving data between two subsystems without processor intervention.
DMS/DMS100 The name of a central office switch manufactured by Northern Telecom. These switches use Custom (proprietary) or National
DSR, data set ready
DSU See CSU/DSU (Channel Service Unit/ Data Service Unit).
DTE (Data Terminal Equipment) Equipment serving as the data source, the data sink, or both. Refers to terminals, computer ports, and printers. Also interface signals typically presented by this equipment.
DTR (Data Terminal Ready)
EIR Excess Information Rate
EIS The SNA Server Emulator Interface Specification.
Encapsulation Process by which an interface device places an end device’s
ETS European Telecommunications Standard from ETSI ETSI The European Telecommunications Standards Institute
EuroISDN The European implementation of Q.931, providing a common standard for ISDN signalling within Europe. Issued by ETSI under the ETS 300 series standards. Net3(BRI) and Net5(PRI). See NET (Normes Europeennes de Telecommunication).
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