Frame (telecommunications)

related topics
{system, computer, user}
{math, number, function}

In computer networking and telecommunication, a frame is a digital data transmission unit or data packet that includes frame synchronization, i.e. a sequence of bits or symbols making it possible for the receiver to detect the beginning and end of the packet in the stream of symbols or bits. If a receiver is connected to the system in the middle of a frame transmission, it ignores the data until it detects a new frame synchronization sequence.

In computer networking, a frame is a data packet on the Layer 2 of the OSI model.[1] A frame is "the unit of transmission in a link layer protocol, and consists of a link-layer header followed by a packet."[2] Examples are Ethernet frames (maximum 1500 byte plus overhead), PPP frames and V.42 modem frames.

In telecommunications, specifically time-division multiplex (TDM) and time-division multiple access (TDMA), a frame is a cyclically repeated data block that consists of a fixed number of time slots, one for each logical TDM channel or TDMA transmitter. In this consist, a frame is typically an entity at the physical layer. TDM application examples are SONET/SDH and the ISDN circuit switched B-channel. TDMA examples are the 2G and 3G circuit switched cellular voice services. The frame is also an entity for time-division duplex, where the mobile terminal may transmit during some timeslots and receive during others.

See also

References


Full article ▸

related documents
Atari Transputer Workstation
Basic rate interface
Burnt-in timecode
Session Layer
Data service unit
Automatic callback
Μ-law algorithm
Virtual machine
Control unit
BESM
Motorola 56000
Secure cryptoprocessor
Multiple document interface
Microsoft Groove
IBM 650
Sinclair ZX80
Apple Attachment Unit Interface
Single UNIX Specification
Finger protocol
Scalable Coherent Interface
Hitachi 6309
VESA Display Data Channel
Killer application
Line code
Packet analyzer
Arcadia 2001
Joint Tactical Information Distribution System
Broadcast domain
Internet Control Message Protocol
Manchester Mark I