Digital multiplex hierarchy
Encyclopedia
In telecommunication
s, 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.
Telecommunication
Telecommunication is the transmission of information over significant distances to communicate. In earlier times, telecommunications involved the use of visual signals, such as beacons, smoke signals, semaphore telegraphs, signal flags, and optical heliographs, or audio messages via coded...
s, a digital multiplex hierarchy is a hierarchy consisting of an ordered repetition of tandem
Tandem
Tandem is an arrangement where a team of machines, animals or people are lined up one behind another, all facing in the same direction....
digital multiplexers that produce signals of successively higher data
Data
The term data refers to qualitative or quantitative attributes of a variable or set of variables. Data are typically the results of measurements and can be the basis of graphs, images, or observations of a set of variables. Data are often viewed as the lowest level of abstraction from which...
rates at each level of the hierarchy.
Digital multiplexing
Multiplexing
The multiplexed signal is transmitted over a communication channel, which may be a physical transmission medium. The multiplexing divides the capacity of the low-level communication channel into several higher-level logical channels, one for each message signal or data stream to be transferred...
hierarchies may be implemented in many different configurations depending on; (a) the number of channels desired, (b) the signaling system
System
System is a set of interacting or interdependent components forming an integrated whole....
to be used, and (c) the bit rate
Bit rate
In telecommunications and computing, bit rate is the number of bits that are conveyed or processed per unit of time....
allowed by the communications
Telecommunication
Telecommunication is the transmission of information over significant distances to communicate. In earlier times, telecommunications involved the use of visual signals, such as beacons, smoke signals, semaphore telegraphs, signal flags, and optical heliographs, or audio messages via coded...
media.
Some currently available digital multiplexers have been designated as Dl-, DS-, or M-series
Digital Signal Designation
Digital Signal Designation is the classification of digital bit rates in the digital multiplex hierarchy used in transport of signals from one location to another in telecommunications.-North America:...
, all of which operate at T-carrier
T-carrier
In telecommunications, T-carrier, sometimes abbreviated as T-CXR, is the generic designator for any of several digitally multiplexed telecommunications carrier systems originally developed by Bell Labs and used in North America, Japan, and South Korea....
rates.
In the design of digital multiplex hierarchies, care must be exercised to ensure interoperability
Interoperability
Interoperability is a property referring to the ability of diverse systems and organizations to work together . The term is often used in a technical systems engineering sense, or alternatively in a broad sense, taking into account social, political, and organizational factors that impact system to...
of the multiplexers used in the hierarchy.