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 In the Internet Protocol suite, a standard, connection-oriented, full-duplex, host-to-host protocol used over packet-switched computer communications networks. TCP corresponds closely to the ISO Open Systems Interconnection--Reference Model (OSI--RM) Layer 4 (Transport Layer). The OSI--RM uses TP-0 or TP-4 protocols for transmission control.\r\n
 
  
 Transmission Control Protocol/Internet Protocol - Two interrelated protocols that are part of the Internet protocol suite. TCP operates on the OSI Transport Layer and breaks data into packets. IP operates on the OSI Network Layer and routes packets. TCP/IP was originally developed by the U.S. Department of Defense.
 
  
 Time-division multiplexing - Digital multiplexing in which two or more apparently simultaneous channels are derived from a given frequency spectrum, i.e. , bit stream, by interleaving pulses representing bits from different channels. Successive pulses represent bits from successive channels, e.g., voice channels in a T1 system.
 
  
 Any transmission, emission, or reception of signs, signals, writings, images, sounds, or information of any nature by wire, radio, visual, or other electromagnetic systems.
 
  
 The branch of science devoted to the transmission, reception, and reproduction of sounds, such as speech and tones that represent digits for signaling. Transmission may be via various media, such as wire, optical fibers, or radio. Analog representations of sounds may be digitized, transmitted, and, on reception, converted back to analog form.Telephony originally entailed only the transmission of voice and voice-frequency data. Currently, it includes new services, such as the transmission of graphics information.
 
  
 The TCP/IP standard network virtual terminal protocol that is used for remote terminal connection service and that allows a user at one site to interact with systems at other sites as if that user terminal were directly connected to computers at those sites.
 
  
 A code used for the transmission and identification of time signals. In telecommunications systems, the format of the time code must be specified.
 
  
 Period of time during which certain activities are governed by specific regulations
 
  
 A network parameter related to an enforced event designed to occur at the conclusion of a predetermined elapsed time.
 
  
 In certain local-area-network protocols, a group of bits that serves as a symbol of authority, is passed among data stations, and is used to indicate the station that is temporarily in control of the transmission medium.
 
  
 A network access procedure in which a token passes from station to station and the only station allowed to transmit information is the station with the token.
 
  
 A quantitative measurement of the total messages and their length, expressed in CCS or other units, during a specified period of time.
 
  
 Any material substance, such as fiber-optic cable, twisted-wire pair, coaxial cable, dielectric-slab waveguide, water, and air, that can be used for the propagation of signals, usually in the form of modulated radio, light, or acoustic waves, from one point to another. By extension, free space can also be considered a transmission medium for electromagnetic waves, although it is not a material medium.
 
  
 In data communications systems, transmit flow control is control of the rate at which data are transmitted from a terminal so that the data can be received by another terminal. It may occur between data terminal equipment (DTE) and a switching center, via data circuit-terminating equipment (DCE), or between two DTEs. The transmission rate may be controlled because of network or DTE requirements.

Transmit flow control can occur independently in the two directions of data transfer, thus permitting the transfer rates in one direction to be different from the transfer rates in the other direction.

Transmit flow control can be either stop-and-go or use a sliding window.
 
  
 Layer 4 This layer responds to service requests from the Session Layer and issues service requests to the Network Layer. The purpose of the Transport Layer is to provide transparent transfer of data between end users, thus relieving the upper layers from any concern with providing reliable and cost-effective data transfer.