Purpose
IBM intended it to be used in three ways:
- Emulation of the older IBM 2703 Communications Controller and its predecessors. The relevant software was the Emulation Program or EP.
- Connection of Systems Network Architecture (SNA) devices to a mainframe. The relevant software was Network Control Program (NCP). When used in this fashion, the 3705 was considered an SNA PU4.
- Combining the two methods above in a configuration called a Partitioned Emulation Program or PEP.
Read more about this topic: IBM 3705 Communications Controller
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