IBM Network Control Program
- IBM Network Control Program
The IBM Network Control Program (NCP) ran on an IBM 3704, 3705 or 3745. It caused the machine to become a Systems Network Architecture (SNA) Physical Unit Type 4 (PU4). A PU4 usually had SDLC links to remote cluster controllers (PU1/PU2) and optional SDLC links to other PU4s. Polling and addressing of the cluster controllers was performed by the NCP without mainframe intervention.
A local NCP connected to a System/370 channel via single address. A remote NCP had no direct connection to a mainframe. Instead a connection was made through a local NCP via SNA packet switching. NCP provided the link control and Network layer functions of a Wide area network.
Further reading
*cite paper | author=W. S. Hobgood | title=The role of the Network Control Program in Systems Network Architecture | publisher=IBM Systems Journal | year=1976 | version=Vol 15, No 1 |url=http://www.research.ibm.com/journal/sj/151/ibmsj1501E.pdf | accessdate=2006-08-26
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