Presentation services is the second layer of NJE protocols. It describes how an NJE transfer unit is packaged into one or more transmission buffers so that it can be transmitted across the network. Before transmitting an NJE transfer unit, the networking facility must:

• Obtain the logical record from spool, if necessary
• Segment the logical record into transmission buffers, if needed
• Compress the transmission buffers within transmission blocks
• Prepare NJE transmission buffers.