Managing Systems and Workgroups: A Guide for HP-UX System Administrators
Configuring a System
Adding Peripherals
Chapter 3 263
— An alternate method to test the terminal hardware is to swap the
suspect terminal with a known good one. This will help identify
problems within the terminal that are not caught by the terminal
selftest.
NOTE Be sure to swap only the terminal (along with its keyboard and
mouse). You want the known good terminal at the end of the
SAME cable that the suspect terminal was plugged into). Also,
plug the suspect terminal (with its keyboard and mouse) into the
same cable that the known good terminal was plugged into and
see if it functions there.
— If the known good terminal doesn’t function on the suspect
terminal’s cable, and the suspect terminal is working fine in its
new location, you can be confident that the terminal itself is
functioning properly and the problem is elsewhere.
— The next thing7 to check is the cable connecting the terminal to
the computer. Swap the suspect cable with a known good one.
NOTE Since you know the terminal at the end of each cable is working,
you only have to swap the ends of the cables where they connect
to the computer. If the problem remains with the terminal it was
associated with prior to the cable swap, you probably have a
broken or miswired cable. If the problem transfers to the other
terminal (and the previously bad terminal/cable combination
works in its new location), then the problem is most likely with
your MUX, port, or interface card.
Other Terminal Problems
The other type of problem you’re likely to run into with terminals is that
of garbage on the screen. Garbage on the screen comes in two types:
garbage intermixed with valid data characters and complete garbage.
What to check for when garbage is mixed with valid data The
following is a list of possible reasons for garbage characters intermixed
with your valid data: