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PAD Services
Introduction
Chapter 6 131
Recommendation X.29 is the protocol for the exchange of messages
between the host and PADs.
Recommendation X.3 defines a set of parameters that control PAD
operation. The following illustration shows the relationship between
each of these recommendations.
Figure 6-1 PAD Support Protocols
PAD services and the HP 9000 host
All of the PAD services can be seen as a pipe through which data is
passed from X.25 to the PTY (Pseudo Type) terminal and vice versa (see
the illustration below). Terminal data is not modified, but the X.25
headers are stripped before data reaches the PTY.
Packet Switching
Network
T
HOST
PAD
X.25 X.25
X.29
X.3
X.28
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