NEC 2400 Integration Manual page 136

Abbreviations
D
DAC
dial access code
DC
direct current
DCE
data communications equipment
DCIU
data communications interface unit
DCP
digital communications protocol
DCS
distributed communications system
DID
direct inward dialing
DIP
data interface process
DMA
direct memory access
DN
directory number
DNIS
dialed number identification service
DSP
digital signal processor
DSU
data service unit
DTE
data terminal equipment
DTMF
dual tone multifrequency
DTR
data terminal ready
ABB-2 Issue 2 December 1995
E
EIA
Electronic Industries Association
ESD
electrostatic discharge
ESS
electronic switching system
EXT
Extension
F
FACE
framed access command environment
FIFO
first-in first-out
FOOS
facility out of service
FMLI
form and menu language interpreter
FKY
function key
G
GBCS
Global Business Communications Systems
H
Hz
hertz