ACC HDLC/LAP-B (ABM) User's Guide

Chapter 3 31

Using HDLC/LAP-B (ABM) Protocol

Application Message Headers

Normal HDL C/LAP-B (ABM) Mode

All application data is transmitted (or received) as the I-field of an

information frame. All headers and/or trailers are supplied by the

protocol for outgoing messages a nd removed by the protocol for incoming

messages. Only the I-field data to be transferred is dealt with by the

application program, which need not even be aware that HDLC/LAP-B

(ABM) is being used for the communications.