HP CommonIO Products Bedienungsanleitung Seite 133

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PAD Services
Remote PAD Support (x29server)
Chapter 6 133
Figure 6-3 Remote PAD Support
The x29server remote PAD support provides capabilities for:
Managing call acceptance.
Launching applications automatically.
Ensuring system security.
Monitoring access and data transfers.
When x29server begins execution, it examines the PAD support section
(pad_spt) of the /etc/x25/x29hosts file. The PAD support section
contains user-configurable parameters for all devices. See Appendix B,
X.25 Configuration Files and Examples, for an example of the x29hosts
file.
Call Acceptance Mechanism and System Security
The x29server process operates in conjunction with devices declared in
the set of pad_spt (PAD support) entries contained in the x29hosts file.
It continually “listens” to the network and initializes communications
channels at the user level when a call request is received. x29server can
handle a large number of calls because each communication channel is
managed by an independent process.
T
T
T
PAD
HP 9000 host
Packet-Switching
Network
X.25
Level III
Pseudo-
terminal
drivers
(PTYs)
Kernel
User Level
BSD Sockets
x29server
Applications
UNIX
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