Installation guide

10-9
Terminal and Personal Computer Problems
c. From another port, enter the following command. Substitute the number of the port for 1:
Local> TEST PORT 1 LOOPBACK EXTERNAL
You can also specify an internal loopback to verify internal port hardware. Use the following
command:
Local> TEST PORT 1 LOOPBACK INTERNAL
If you are using the Remote Console Facility (RCF) or Console Carrier Requestor (CCR), use the
local switch character to stop the test. Otherwise, use the Break key.
d. If there are irregularities in the ASCII pattern, the port might be faulty. Refer to Chapter 29 for
service information.
For more information on the TEST PORT command, refer to the Network Access Software
Commands Reference Guide.
When you use the TEST PORT command for loopbacks, the input and the output
speeds for the port must be the same. If you do not specify a value for the COUNT
option in the TEST PORT command, the default count (23 lines) appears.
NOTE