An independent LU can communicate directly with a peer system and does not need the support of a host computer. Independent APPC LUs, as used in AS/400 APPN networks, provide the ability to run multiple, concurrent, parallel sessions between a local and remote LU pair.
When configuring independent APPC LUs, you should note that when SNA Server is used to communicate with a TP on a mainframe over an independent APPC LU, the host system must be running VTAM V3R2 or later. The version of NCP required on the mainframe is dependent on the type of FEP used. For 3725 systems, NCP V4R3 or later is required. For 3745 systems, NCP V5R2 or later is required.