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Data Link Protocols
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ACK-frame acknowledgement additional application associated bandwidth binary bit cell bit rate bit stream block buffer channel Chapter character circuit clock coaxial cable connection control scheme data communication data link data network data transfer defined described detected device digits encoding equipment error burst error control example exchange flow control frame contents frequency FTAM function HDLC hence I-frame identifier idle RQ indication initiate interface ISO Reference Model kbps known link layer logical MAC unit mode modem modulation network layer normally octets operation parameters parity bit physical priority procedure processing protocol entity protocol layers PSTN receipt received request ring selected sequence diagram sequence numbers service primitives session layer shown in Figure signal specific standards switched synchronous terminal timer token token bus token ring TPDU transmission medium transport layer typical UART user data