d-4

In telecommunication, a D-4 is a framing standard for traditional time-division multiplexing, which standard describes user channels multiplexed onto a trunk that has been segmented (framed) into 24 bytes of 8 bits each. Note: The multiplexing function is performed in the D-4 framing structure by interleaving bits of consecutive bytes as they are presented from individual circuits into each D-4 frame. Source: from Federal Standard 1037C

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data service unit
data signaling rate
data transmission circuit
date time group
db (car)
db(a)
dbm
dbrn
data circuit terminating equipment
decollimation
decrypt

degradation
degree of isochronous distortion
degree of start stop distortion
dejitterizer
delay
delay encoding
delay line
delta modulation
demand assignment
demand factor
demand load

desensitation
design objective
detector
deterministic routing
pulse dialing
dial up
dielectric
dielectric strength
differential encoding
differential manchester encoding
diffraction grating

digital access and cross connect system
digital filter
digital milliwatt
digital multiplex hierarchy
digital signal 0
digital subscriber line
digital transmission group
digitizer
digroup
direct access
direct connect