Only Type 6 logical units can be independent. All other LU types are dependent. However, not all LU 6.2 implementations are independent.
Not every LU 6.2/PU 2.1 implementation can work with independent LUs. There are some aspects of PU 2.1 that NCP requires with which not all PU 2.1 implementations will work correctly. This reflects the fact that not all midrange and PC SNA Gateway vendors had the latest NCP and VTAM for testing.
PU 2.1 support can be enhanced to work with ILUs without changes to CA XCOM Data Transport. NCP supports ILUs over SDLC, the most common configuration using ILUs. A local area network gateway attached through an SDLC link to a host can also use ILUs. NCP also supports ILUs over a token ring through the TIC.
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