Information transfer format (I-Frame) – It transports the numbered frames in a sequential manner, which contain the information field.There are three types of frames information, supervisory and unnumbered. The HDLC uses a group of commands and responses for its working. Checksum field -In this field, the bits are reserved for the performing the cyclic redundancy code.Data field – This field is used to hold the information.Control field – The bits in the control field is intended for the sequence number and acknowledgements.
#POINT TO POINT PROTOCOL EXPLAINED ISO#
Both SDLC and HDLC protocol are developed by IBM and submitted to the ANSI and ISO for the acceptance as the international standards. SDLC is the predecessor of the HDLC which stands for the Synchronous Data Link Control protocol. The encapsulation of the data means to change the format of the of the data. HDLC (High-level Data Link Control) is a WAN protocol intended to perform the encapsulation of the data in the data link layer.