Each Frame contains a 24-byte Frame Header, which contains fields describing the contents and handling of the Frame. The Frame Header format is shown in Figure 7.1 and includes the following fields:

R_CTL Routing Control used for categorizing the Frame function

D_ID Destination Identifier address identifier of the Frame s destination Port

S_ID Source Identifier address identifier of the Frame s source Port

CS_CTL Class Specific Control control information on Frame handling that depends on the Class of transmission.

TYPE data structure type categorization of the Frame s data

F_CTL Frame Control control information on Frame handling

SEQ_ID Sequence identifier unique identifier for the Frame s Sequence

DF_CTL Data Field control indication of optional header inclusion

SEQ_CNT Sequence count number of the Frame within its Sequence or Exchange

OX_ID Originator Exchange ID identification of Frame s Exchange at Originator also may be used for frame prioritization and preemption of dedicated connections.

RX_ID Responder Exchange ID identification of Frame s Exchange at Responder

Parameter Relative Offset in Data Frame, Frame information in Link Control Frame

A major function of the Frame Header fields is to uniquely identify Frames. No two Frames active at the same time can have the same identifier fields, to prevent the possibility of data corruption through Frame mis-identification. Each Frame is uniquely identified by the values in the S_ID, D_ID, OX_ID, RX_ID, SEQ_ID, and SEQ_CNT field values. The set of Frame ID values (S_ID, D_ID, OX_ID, RX_ID, and...