Verifying integrity of a dedicated serial line

For PPP to run over a dedicated serial line, check the line itself and its connections at each end:

• Verify the soundness of the line connections.

• Verify that the local and remote systems on the connection are set to use the same data transfer speed. For the local SCO system, check the value of the speed parameter for the endpoint in the /etc/ppphosts file. For the remote system, check the data transfer speed setting in its endpoint configuration.

• You have access to the remote system.

• The remote system is running the UNIX operating system.

1. Log in at both machines as root.

2. Disable PPP for this serial line at both machines.

3. Enable getty at the remote machine by executing the following command there:
   
   enable tty_number

4. At the local machine, edit the file /usr/lib/uucp/Devices to be sure that the tty port for the serial line being used is configured for direct access and both systems specify the same speed. For example:

      Direct tty1a - 9600 direct
   

5. Enter the following command on the source machine: cu -l tty_number.

   Your serial line is sound if the screen displays connected and the login prompt appears. Type ~. at the beginning of a line to exit the cu program.

   If there is no response, the problem probably lies with the cable. Check the cable's connections or try another cable. If an error message appears, see Chapter 7, ``Connecting to other computers with UUCP'' in the System Administration Guide.

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