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This article is about the more general meaning of the term "data stream". For the UK-specific DSL technology called "Datastream
Datastream

Datastream is the name of a type of broadband network connection in the United Kingdom. Datastream is a wholesale product in which the wholesale customer can purchase connectivity between their own point of presence and a number of end users....
", also see the IP Stream
Ipstream

IPstream is the most highly-used wholesale broadband Internet service in the United Kingdom. BT Wholesale sells the service to ISPs and IPTV providers, who use it to provide ADSL services to customers over BT Openreach telephone lines....
 article.


In telecommunications and computing
Computing

Computing is usually defined as the activity of using and developing computer technology, computer hardware and computer software. It is the computer-specific part of information technology....
, a data stream is a sequence of digitally encoded
Encoder

An encoder is a device, circuit, transducer, software program, algorithm or person that converts information from one format or code to another for the purposes of standardization, speed, secrecy, security, or saving space by shrinking size....
 coherent signals (packets of data
DATA

Debt, AIDS, Trade in Africa is a multinational Non-governmental organization founded in January 2002 in London by U2's Bono along with Robert Sargent Shriver III and activists from the Jubilee 2000 Drop the Debt campaign....
 or datapackets) used to transmit
Transmission (telecommunications)

In telecommunications, transmission is the process of sending, propagating and receiving an analogue or digital information signal over a physical point-to-point or point-to-multipoint transmission medium, either wired or wireless....
 or receive information
Information

Information as a Conveyed concept has a diversity of meanings, from everyday usage to technical settings. Generally speaking, the concept of information is closely related to notions of constraint, communication, control system, data, form, instruction, knowledge, Meaning , stimulation, pattern, perception, and knowledge representation....
 that is in transmission
Transmission (telecommunications)

In telecommunications, transmission is the process of sending, propagating and receiving an analogue or digital information signal over a physical point-to-point or point-to-multipoint transmission medium, either wired or wireless....
.

In electronics
Electronics

Electronics refers to the flow of charge through nonmetal electrical conductor , whereas electrical refers to the flow of charge through metal electrical conductor....
 and computer architecture
Computer architecture

Computer architecture in computer engineering is the conceptual design and fundamental operational structure of a computer system. It is a blueprint and functional description of requirements and design implementations for the various parts of a computer, focusing largely on the way by which the central processing unit performs internally an...
, a data stream determines for which time which data item is scheduled to enter or leave which port of a systolic array
Systolic array

In computer architecture, a systolic array is a pipe network arrangement of processing units called cells. It is a specialized form of parallel computing, where cells , compute data and store it independently of each other....
, a Reconfigurable Data Path Array or similar pipe network, or other processing unit or block.






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This article is about the more general meaning of the term "data stream". For the UK-specific DSL technology called "Datastream
Datastream

Datastream is the name of a type of broadband network connection in the United Kingdom. Datastream is a wholesale product in which the wholesale customer can purchase connectivity between their own point of presence and a number of end users....
", also see the IP Stream
Ipstream

IPstream is the most highly-used wholesale broadband Internet service in the United Kingdom. BT Wholesale sells the service to ISPs and IPTV providers, who use it to provide ADSL services to customers over BT Openreach telephone lines....
 article.


In telecommunications and computing
Computing

Computing is usually defined as the activity of using and developing computer technology, computer hardware and computer software. It is the computer-specific part of information technology....
, a data stream is a sequence of digitally encoded
Encoder

An encoder is a device, circuit, transducer, software program, algorithm or person that converts information from one format or code to another for the purposes of standardization, speed, secrecy, security, or saving space by shrinking size....
 coherent signals (packets of data
DATA

Debt, AIDS, Trade in Africa is a multinational Non-governmental organization founded in January 2002 in London by U2's Bono along with Robert Sargent Shriver III and activists from the Jubilee 2000 Drop the Debt campaign....
 or datapackets) used to transmit
Transmission (telecommunications)

In telecommunications, transmission is the process of sending, propagating and receiving an analogue or digital information signal over a physical point-to-point or point-to-multipoint transmission medium, either wired or wireless....
 or receive information
Information

Information as a Conveyed concept has a diversity of meanings, from everyday usage to technical settings. Generally speaking, the concept of information is closely related to notions of constraint, communication, control system, data, form, instruction, knowledge, Meaning , stimulation, pattern, perception, and knowledge representation....
 that is in transmission
Transmission (telecommunications)

In telecommunications, transmission is the process of sending, propagating and receiving an analogue or digital information signal over a physical point-to-point or point-to-multipoint transmission medium, either wired or wireless....
.

In electronics
Electronics

Electronics refers to the flow of charge through nonmetal electrical conductor , whereas electrical refers to the flow of charge through metal electrical conductor....
 and computer architecture
Computer architecture

Computer architecture in computer engineering is the conceptual design and fundamental operational structure of a computer system. It is a blueprint and functional description of requirements and design implementations for the various parts of a computer, focusing largely on the way by which the central processing unit performs internally an...
, a data stream determines for which time which data item is scheduled to enter or leave which port of a systolic array
Systolic array

In computer architecture, a systolic array is a pipe network arrangement of processing units called cells. It is a specialized form of parallel computing, where cells , compute data and store it independently of each other....
, a Reconfigurable Data Path Array or similar pipe network, or other processing unit or block. Often the data stream is seen as the counterpart of an instruction stream, since the von Neumann machine
Von Neumann architecture

The von Neumann architecture is a design model for a stored-program digital computer that uses a central processing unit and a single separate computer storage structure to hold both instructions and data ....
 is instruction-stream-driven, whereas its counterpart, the Anti machine
Anti machine

In computer science, anti machine refers to the basic machine paradigm for reconfigurable computing that is the counterpart of the Von Neumann architecture....
 is data-stream-driven.

The term "data stream" has many more meanings, such as by the definition from the context of systolic arrays.

In formal way: A data stream is an ordered pair where:

  1. is a sequence of tuple
    Tuple

    In mathematics, a tuple is a sequence of a specific number of values, called the components of the tuple. These components can be any kind of mathematical objects, where each component of a tuple is a value of a specified type....
    s,
  2. is the sequence of time intervals (i.e. Rational or Real numbers) and each .