Data Link Protocols Asynchronous Protocols XMODEM frame ...
Data Link Protocols Asynchronous Protocols XMODEM frame ...
Data Link Protocols Asynchronous Protocols XMODEM frame ...
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IBM’s Binary SynchronousCommunication (BSC)• Character-oriented protocol• Half-duplex, stop-and-wait ARQ• 2 <strong>frame</strong> types• <strong>Data</strong> <strong>frame</strong>(data transmission)• Control <strong>frame</strong>(connect/disconnect and flow/error control)A simple BSC data <strong>frame</strong>SYN = Synchronous idle = 0010110STX = Start of text = 0000010ETX = End of text = 00000117of 538of 53A BSC <strong>frame</strong> with a headerA multiblock <strong>frame</strong>Header Fields:• address (sender/receiver)• #<strong>frame</strong> identifier (0/1 for stop-and-wait ARQ)ITB = Intermediate text block9of 5310 of 53Multi<strong>frame</strong> transmissionControl <strong>frame</strong>ETB = End of transmission Block11 of 53Note: Control Frame is used to send command* Establish connection* Maintaining flow & error control* terminating connection12 of 532
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