digital multiplex hierarchy

In telecommunication, a digital multiplex hierarchy is a hierarchy consisting of an ordered repetition of tandem digital multiplexers that produce signals of successively higher data rates at each level of the hierarchy. Digital multiplexing hierarchies may be implemented in many different configurations depending on (a) the number of channels desired, (b) the signaling system to be used, and (c) the bit rate allowed by the communications media. Some currently available digital multiplexers have been designated as Dl-, DS-, or M-series, all of which operate at T-carrier rates. In the design of digital multiplex hierarchies, care must be exercised to ensure interoperability of the multiplexers used in the hierarchy.

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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
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 signal 0
digital subscriber line
digital transmission group
digitizer
digroup
direct access
direct connect

direct distance dialing
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