Introduction to Tandem X.25 Capabilities

X25AM Connectivity
Tandem X.25 Features and Capabilities
065307 Tandem Computers Incorporated 2–15
Connecting Remote
Asynchronous Terminals
To connect a Tandem system to a remote terminal through a PSDN, you define the
terminal as an X25AM Interactive Terminal Interface (ITI) subdevice. The ITI protocol
allows users at remote locations to communicate with an application process as
though the terminal were connected directly to the computer system through an
asynchronous controller. A remote asynchronous terminal connection to X25AM is
shown in Figure 2-6.
Figure 2-6. Remote Asynchronous Terminal
Character Data
PAD
Tandem
NonStop System
Conversation
or
Block-Mode
Terminal
024
Packet-Switched
Network
ITI
X25AM
Application
DataPackets
ITI supports both conversation-mode and block-mode terminals, including:
6510
6520
6530
teletype-compatible
The terminals interface to the network through a standard PAD interface, which can
be located either at the terminal or within the PSDN. The Tandem host system
communicates to the PSDN as a packet-mode DTE.
PAD Parameters
For detailed information on the default PAD parameter values used by the ITI
protocol, and SETMODE calls that you can use to change them, refer to the X25AM
Programming Manual.