BG Protocol

Cipher Systems
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  Flow and Error Control Bore Gowda S.B Associate Professor E and C Engg. Dept. MIT, Manipal  Flow Control ã Flow control coordinates the amount of data that can be sent before receiving acknowledgement ã It is one of the most important functions of data link layer. ã Flow control is a set of procedures that tells the sender how much data it can transmit before it must wait for an acknowledgement from the receiver. ã Receiver has a limited speed at which it can process incoming data and a limited amount of memory in which to store incoming data. ã Receiver must inform the sender before the limits are reached and request that the transmitter to send fewer frames or stop temporarily. ã Since the rate of processing is often slower than the rate of transmission, receiver has a block of memory (buffer) for storing incoming data until they are processed.  Error Control ã Error control includes both error detection and error correction. ã It allows the receiver to inform the sender if a frame is lost or damaged during transmission and coordinates the retransmission of those frames by the sender. ã Error control in the data link layer is based on automatic repeat request (ARQ). Whenever an error is detected, specified frames are retransmitted.  Error and Flow Control Mechanisms   Assuming channel is error free   Not realistic…    No need for error control
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