Data communications, computer networks, and open systems
The long awaited revision of Halsall's bestselling introduction to data communications, networks, and open systems. In addition to completely revising the material on networking, networking management, and open distributed processing, application protocols have been expanded to include MHS, X400, VT, EDI, and X500.
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PART ONE DATA COMMUNICATIONS
The electrical interface
15 other sections not shown
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ACSE application process application protocol associated binary bit rate block BPDUs bridge buffer byte cable Chapter character circuit client communication connection connectionless contents data link data transfer datagram defined destination device encoding error control example exchange field flow control frame FTAM function gateway HDLC header hence I-frame identifier idle RQ indication initial interconnection interface known mode modem network layer normally NS-user NSAP octets operation packet parameters port procedure protocol data units protocol entity protocol layers PSTN receipt received remote request retransmission ring routing scheme segment sequence diagram sequence number server service access point service element service primitives session layer shown in Figure signal specific standards station subnet synchronization TCP/IP terminal timer token token bus token ring topology TPDU transmission transmitted transport layer user data user service