Introduction to Tandem X.25 Capabilities

X25AM Connectivity
Tandem X.25 Features and Capabilities
065307 Tandem Computers Incorporated 2–17
Connecting to a PAD
without a PSDN
You can also use X25AM to connect a Tandem system to multiple terminals over a
single X25AM line by connecting the X25AM line to a PAD (Figure 2-7), and by
defining the terminals as ITI subdevices. The PAD acts as a sort of multiplexer,
connecting a single X25AM line to multiple asynchronous terminals or PCs. This type
of connection eliminates the need for multiple cables to the host computer, and allows
the terminals to benefit from the higher speed of the bit-synchronous communications
line. It also allows terminals to be located a greater distance away from the host.
Figure 2-7. Connecting to a PAD without a PSDN
Tandem
NonStop System
ITI
X25AM
025
PAD
Local Terminals
ITI Subdevices
X25AM
Bit-Synchronous Line
Asynchronous
Lines