Direct Distance Dialing

In telecommunication, direct distance dialing (DDD) is a network-provided service feature in which a call originator may, without operator assistance, call any other user outside the local calling area. DDD requires more digits in the number dialed than are required for calling within the local area. DDD also extends beyond the boundaries of national public telephone networks. Direct distance dialing (DDD) is a North American Numbering Plan term, and considered obsolete as calls are now rarely completed in any other manner. In the UK and other parts of the British Commonwealth, the equivalent term is or was "STD", for subscriber trunk dialling. Source: partly from Federal Standard 1037C and from MIL-STD-188

 

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demand assignment
demand factor
demand load
desensitation
design objective
detector
deterministic routing
d 4
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
directional coupler
directive gain
direct sequence spread spectrum
disengagement originator
dispersion limited operation
distortion
distortion limited operation
distributed database
distributed queue dual bus
distributed switching
disturbance voltage
diurnal phase shift
diversity reception
dod master clock
double ended synchronization
double sideband reduced carrier transmission
double sideband suppressed carrier transmission
doubly clad fiber
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