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High-Level Data Link Control

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High Level Data Link Control.A bit oriented Layer 2 protocol. Used by older stemcomputers to connect to each other. Was iported by ITU into the X.25 stack. It was modified by IBM to become the SDLC protocol that became the layer 2 protocol for SNA System Network Architecture. HDLC is now the basis for syncronous PPP (point to point protocol) used by many servers to connect over Wide Area Networking (WAN)


The format of the frame is that it begins and ends with an bit pattern 01111110 or hex 7E

then there is an address and a control field following with a data field that may be 0 to 5000 octets long.

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