Migrating X.25 over ACC to X.25 over PSI

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PSPDN Packet Switched Public Data Network
NLI Network Layer Interface
SAM System Administration Manager
WAN Wide Area Network
X.25/ACC X.25 over ACC adapter/ hardware
X.25/ PSI X.25 over PSI network adapter
X.25 Overview
The Hewlett-Packard X.25 link product provides the hardware and software components to enable
HP 9000 systems and Integrity systems to communicate with other HP and non-HP systems over
X.25 packet switching networks.
The X.25 link implements the CCITT X.25 Recommendations and includes the components
necessary to connect HP 9000 systems and Integrity systems to a public or private packet switching
network or to another system in a back-to-back configuration that conforms to the CCITT X.25
Recommendations (1980, 1984 or 1988). The CCITT X.25 Recommendations specify the protocols
to be used between a Data Terminal Equipment (DTE) and a Packet Switched Public Data Network
(PSPDN), when accessed by a dedicated circuit.
The X.25 software provides two sets of APIs, NLI and X.25CCITT Socket, to write user applications.
This software also supports IP datagram transmission over X.25 protocol. The X.25 architecture
implements three layers of the OSI model. The three layers in the X.25 architecture are the physical
layer, the data link layer and the packet layer. Figure 1 illustrates the X.25 architecture (showing
X.25/ACC and X.25/PSI).