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X.25/ACC Update Guide > Chapter 2 Preparing to upgrade your system

For X.29 PAD Services users

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The upgrade procedure only impacts internal X.25 drivers. The figure below illustrates how the SAM and PAD Services user space programs are dependent on the product's upper interfaces (X.25 configuration files and BSD Sockets). These modules are not affected by the upgrade procedure. This is why PAD Services users can be certain that their applications will operate properly with X.25 Streams.

Users of PAD Services interact with X.25 software through the X.29 PAD Services module. Configuration and system administration tasks are performed through SAM.

Maintenance considerations

Although SAM is able to configure all PAD Services parameters, after a system reboot or shutdown it cannot re-start the PAD Services daemon processes (x29server, x29printd and x29uucpd). You can start these daemons manually or you can set up your system to have them run automatically at reboot.

Using padem

The padem (PAD Emulation) program uses the BSD API to send outbound call request packets. X.25 Classic sends outbound call requests (via padem) to the first card in the system. X.25 Streams sends call requests to any card that is available at connection time.

HP recommends that you identify which card padem will use by specifying it in your X.29 configuration file, or by entering its name at the padem prompt (refer to your padem man pages for more on this).

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