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Encyclopedia > Data frame
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In telecommunications, a frame is a packet which has been encoded for transmission over a particular link. A packet is the fundamental unit of information carriage in all modern computer networks. ... Data transmission is, very generally speaking, the conveyance of any kind of information from one space to another. ... The data link layer is level two of the seven-level OSI model. ...


How framing works

This process involves, at a minimum, adding delimiters to distinguish the packet from dead air, address and control fields specific to the link, and checksums to detect errors. The term delimiter refers to a separating character. ... A checksum is a form of redundancy check, a very simple measure for protecting the integrity of data by detecting errors in data that is sent through space (telecommunications) or time (storage). ...

  • Sometimes the address, control, and checksum fields from the higher-level protocol are used directly.


The difference between Frames and Packets as used by the NASA Deep Space Network
The difference between Frames and Packets as used by the NASA Deep Space Network


Image File history File links Packets-and-Frames_illustration. ...


A multiplex interpretation of 'Frames'

Frame may also refer to the way a multiplexer divides the underlying communication channel so that it can be used simultaneously for more than one transmission. Notionally, each frame is a slot which could be filled by a transmitted packet. In these schemes, not all frames are necessarily in use at once. Multiplex is either a word derived from multi- + plex (fold) or a synthetic portmanteau combining the words multiple and complex and can be another word for many or (literally) manifold. ...

  • In the multiplex structure of pulse-code modulation (PCM) systems, a frame is a set of consecutive time slots in which the position of each digit can be identified by reference to a frame-alignment signal. (This signal does not necessarily occur in each frame.)
  • In a time-division multiplexing (TDM) system, a frame is a repetitive group of signals resulting from a single sampling of all channels. The term in-frame is used to indicate that a time-division multiplexer is properly synchronized with the demultiplexer on the other end of the link, so that (barring in-flight data corruption) packets will be properly received.

Apparently framing was invented by a Ukranian Mathematician called Andrei Gaboershnik. Pulse-code modulation (PCM) is a digital representation of an analog signal where the magnitude of the signal is sampled regularly at uniform intervals, then quantized to a series of symbols in a digital (usually binary) code. ... In mathematics, a set can be thought of as any collection of distinct things considered as a whole. ... Jump to: navigation, search 8:17 am, August 6, 1945, Japanese time. ... In mathematics and computer science, a numerical digit is a symbol, e. ... Signaling, or signal, may mean: Look up signal on Wiktionary, the free dictionary. ... Time-division multiplexing (TDM) is a type of digital multiplexing in which two or more apparently simultaneous channels are derived from a given frequency spectrum, i. ...


  Results from FactBites:
 
Data frame - Wikipedia, the free encyclopedia (262 words)
Frame may also refer to the way a multiplexer divides the underlying communication channel so that it can be used simultaneously for more than one transmission.
In the multiplex structure of pulse-code modulation (PCM) systems, a frame is a set of consecutive time slots in which the position of each digit can be identified by reference to a frame-alignment signal.
The term in-frame is used to indicate that a time-division multiplexer is properly synchronized with the demultiplexer on the other end of the link, so that (barring in-flight data corruption) packets will be properly received.
Frame Relay (3517 words)
Frame Relay is a protocol standard for LAN internetworking which provides a fast and efficient method of transmitting information from a user device to LAN bridges and routers.
The Frame Relay protocol uses a frame structured similar to that of LAPD, except that the frame header is replaced by a 2-byte Frame Relay header field.
Frame fragmentation is necessary to control delay and delay variation when real-time traffic, such as voice, is carried across the same interfaces as data traffic.
  More results at FactBites »

 
 

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