Introduction to Tandem X.25 Capabilities

X25AM Connectivity
Tandem X.25 Features and Capabilities
2–14 065307 Tandem Computers Incorporated
messages issued from the network. X3PAD can also transfer data from Guardian files
to the network, or from the network to Guardian files.
The X3PAD program is based on CCITT Recommendation X.3, which describes the
functions of a PAD and the parameters associated with the asynchronous terminals
accessing the PAD. X3PAD also supports the procedures of Recommendation X.29,
which describes the communications between a PAD and a packet-mode DTE via a
PSDN. For detailed information on the default PAD parameter values for X3PAD,
and the commands you can use to change them, refer to the X25AM Programming
Manual.
A local asynchronous terminal is connected to the Tandem system through ATP6100,
another Tandem product that is automatically provided with all Tandem systems. A
local asynchronous terminal connection to X25AM using X3PAD is illustrated in
Figure 2-5.
Figure 2-5. Local Asynchronous Terminal Connection through X3PAD
Remote Host
(DEC, IBM, HP
or another
company's
system)
PTP
Protocol
Tandem
NonStop System
Asynchronous
Terminal
023
Packet-Switched
Network
Character Data
X.25
DataPackets
Character Data
PTP
X25AM
ATP6100
X3PAD
X.25
DataPackets
Terminal Commands
The terminal operator can issue commands to perform the following functions:
establish or disconnect a virtual circuit
receive or send Guardian files
set or display PAD operational parameters