Frame is a unit of digital data transmission in computer and telecommunication networks. In a packet-switched system, a frame is a simple container for a network. In other telecommunication systems, frames are repeating structures that support time division multiplexing.
- Frame (HTML) - in web-design: the presentation of multiple HTML documents on a separate web page.
- Frame rate is the number of images displayed on the screen per time unit, usually expressed in FPS (frames per second)
- Frame (GUI), a box to save other widgets in the graphical user interface
A frame typically includes a synchronization feature that has a sequence of bits, ‘or symbols’, indicating the receiver, the received symbol, or the beginning and end of the upload data in the bit stream. If the receiver is connected to the system during transmission, it will ignore the information until it detects a new frame synchronization sequence.
In the OSI model of a computer network, a frame is a data unit of the link layer. The frame is the result of the last encapsulation layer before the data is transferred by the physical layer. Each frame is separated from the next frame by an interval. It is a series of bits, usually consisting of a frame synchronization, a packet payload, and a frame check sequence. Examples include Point-to-Point Protocol frames,Fiber Channel frames, Ethernet frames, and V.42 modem frames.
Typically, several frames of different sizes are nested within each other. For example, when using the PPP protocol in asynchronous serial communication, the 8 bits of each byte consist of a start bit and a stop bit, and the payload data bytes in the network packet are framed by the header and footer, several packets can be framed with bound bytes.
Time division multiplexing
In telecommunications, particularly time division multiplexing (TDM) and time division multiple access variants (TDMA), a frame is a cyclically repeated block of data consisting of a fixed number of time slots; each interval is time used for Logical TDM channels or TDMA transmitters. In this context, a framework is usually an entity at the physical layer. Examples of TDM applications are SONET / SDH circuit-switched B channels and ISDN, while TDMA examples are circuit-switched data used in early cellular voice services. This frame is also an entity for time division duplexing, wherein the handset can transmit during certain time slots while receiving other slots.