Multiplex communications – Wide area network – Packet switching
Patent
1988-02-29
1990-01-09
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 60, H04J 326
Patent
active
048933074
ABSTRACT:
The invention disclosed herein provides the basic operation capabilities of SNA data communications for host-to-remote terminal sessions across a packet switched network such as the Defense Data Network (DDN). The problem that is presented by the integration of these two technologies is that SNA is a connection oriented technology and DDN is a connctionless technology that requires an Internetting Protocol (IP) header on all information transmitted through the network and across multiple networks. One of the concepts of the invention is the definition of a localized SNA network to each SNA host by the channel attached front end processors (FEPs). These FEPs present a SNA LU2 definition to the host to allow it to carry out regular SNA sessions over the packet switched network to remote terminal users. The second concept is providing primary SNA PU5 support, in the Remote Access Facilities (RAF). This enables each RAF to control all the SNA terminals and devices attached to it as a separate network. The RAF and the FEP working together imbed the SNA protocols in the IP datagrams and provide the proper SNA connections and control. This technique allows any terminal to access any host for which it has authorization.
REFERENCES:
patent: 4679189 (1987-07-01), Olson et al.
patent: 4706081 (1987-11-01), Hart et al.
F. N. Parr et al., "Protocol Boundary for SNA Terminals with Condensed State Information," IBM TDB, Aug. 1982, pp. 1317-1319.
R. C. Campbell et al., "Series/1 Terminal Interface Processor System Program," IBM TDB, Nov. 1985, pp. 2316-2318.
M. P. Caraballo et al., "Programmable Communications Processor," IBM TDB, Mar. 1985, pp. 6323-6324.
A. Cohen et al., "3275 Dial SNA Gateway Facility," IBM TDB, Mar. 1986, p. 4378.
B. Gavis et al., "Technique for Optimal Assignment of Traffic to Routes in Telecommunication Networks," IBM TDB, Apr. 1983, pp. 5970-5973.
Marsili Michael P.
McKay Douglas B.
Morten Richard M.
Hoel John E.
International Business Machines - Corporation
Marcelo Melvin
Olms Douglas W.
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