This topic describes the multi-leaving functions of NJE. After NJE records are placed into transmission buffers, the buffers are sent in a stream to a remote node. Each buffer begins with a 2-byte RCB/SCRB control field that defines the stream (SYSIN 1-7 or SYSOUT 1-7) to which this packet belongs. BSC and CTC packets begin with a BCB and two FCS bytes. The first SCB (compressed data) follows the RCB/SRCB field. Because SNA packets are compressed after you append the RCB/SRCB, the RCB/SRCB is only a logical beginning: the packet on the link really begins with an SNA SCB byte.