scope:

Scope and field of application

This International Standard is applicable to data stations employing HDLC balanced classes of procedures which provide the XID command/response capability with the two specific parameter fields, identified below. It is used to select a pair of operational link addresses when preassigned, system designated addresses are not known on an apriori basis; e.g., switched circuit data links. Additional XID frame functions (including the exchange of operational parameters, command/response support, higher layer information, etc.) may be accomplished in conjunction with data link layer address determination or following address determination, with additional XID frame exchanges.

NOTE - Address resolution procedures for situations where the remote DTE does not nave XID frame, "aU-statlon" address, or complete address support capabilities as defined in clause 4 below are not within the scope of this International Standard.