gtps2m3cACF/SNA Data Communications Reference

Bracket Support

Bracket support is provided primarily for use with devices attached to the 3274/3276 cluster controllers. Brackets identify the beginning and end of a conversation between a logical unit and a host application. A bracketed conversation continues, uninterrupted, until the host application ends it with an "end bracket" indicator. The logical unit initiates the conversation with a begin bracket indicator in the input message. Bracket support is not available for:

LU                        TPF          Comments
 
Message 1 -----BB------->              Begin bracket = BB
          <-------------- Reply
 
Message 2 -------------->
          <----EB-------- Reply        End bracket = EB