Between 1981 and 1984, the research laboratories of the Nippon Telegraph and Telephone Public Corporation (currently NTT) began development of a communications control processor (CCP) for the DIPS-11/5E Series to succeed the 7400 Series CCP. Prototypes of the CCP-IIE DIPS large communication controller and the CCP-IE DIPS small communication controller were completed, respectively, in 1985 and 1986.
The main features of the CCP for the DIPS-11/5E Series were as follows: (1) use of a general-purpose DIPS architecture for improving functionality of communication processing features, diversion and sharing of communication software developed for DIPS small systems, and use of the Integrated Communication Adapter (ICA) system developed for small systems, particularly in the communication control part where real-time performance requirements were particularly stringent; (2) achievement of high-speed computer communication by directly housing super-digital dedicated lines (a service that began in 1984) and providing spares for directly housing lines to handle the start of network services such as INS Net; and (3) use of a high-speed optic loop to connect with multiple host computers and thereby achieve a CCP complete group switching system for CCP failures to improve system reliability.
