TAILIEUCHUNG - PROTOCOL BASICS

Introduction In chapter 3: Circuits and techniques can be employed to transmit a frame of information between 2 DTEs Error detection schemes which allow the receiving DTE to determine the presence of any errors in the transmitted bit stream. | PROTOCOL BASICS Introduction In chapter 3: Circuits and techniques can be employed to transmit a frame of information between 2 DTEs Error detection schemes which allow the receiving DTE to determine the presence of any errors in the transmitted bit stream. Introduction Best-try transmission: when a transmission error is detected, the complete data block must be discard connectionless mode transmission Reliable transmission: in addition to detecting when errors are present, a defined set of rules or control procedures must be adopted by both communicating parties to ensure the reliable transfer of message connection mode transmission Introduction Data link control protocol: The combined error detection/correction cycle is known as error control Control mechanism (flow control and connection management) observed by two communicating parties Basic components of data link control protocols will be considered in this chapter Error Control Receiver checks the received frame for possible transmission errors returns a short control message to acknowledge its correct receipt Returns a short control message to request another copy of the frame is sent Automatic Repeat Request (ARQ) Error Control Automatic Repeat Request (ARQ) Idle RQ (Stop and wait ARQ): used with character-oriented (or byte-oriented) data transmission schemes Continuous RQ: used primarily with bit-oriented transmission schemes Selective repeat Go-back-N Idle RQ (stop and wait ARQ) The idle RQ control scheme has been defined to enable blocks (frames) of printable and formatting control characters to be reliably transferred In idle RQ The sender (source): primary (P) The receiver (destination): secondary (S) Information frames: I-frames Idle RQ (stop and wait ARQ) The idle RQ protocols operates in a half-duplex mode since the primary, after sending and I-frame, must wait until it receives and indication from the secondary as to whether the frame was correctly received or not 2 .

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