Checks the cable from the Gateway-ST to the local modem.
•
Modem loopback tests:
Check the communications link either to the modem at the Gateway-ST
end or to the modem at the IBM end. Use a digital loopback test on the
local modem and an analog loopback test on the remote modem.
Use the SNANCP loopback tests in either of the following cases:
•
You have been receiving Gateway-ST error messages.
•
You have not been able to locate a problem by using the NCP loopback
tests.
For all SNANCP tests, ensure that the line state is OFF. Use the following
command to verify the state of the line:
SNANCP> SHOW LINE
line-id STATUS
If the line state is not OFF, issue the following SNANCP command:
SNANCP> SET LINE
line-id STATE OFF
Refer to the DECnet SNA Gateway-CT and ST Management book for
information on SNANCP commands.
2.2.1 Controller Loopback Test
Use this loopback test to check the communications device on the Gateway-ST.
To use the controller loopback test, enter the following command:
SNANCP> LOOP LINE
line-id AT CONTROLLER
If this test fails, there is a fault with the communications device. Ask your
Digital Customer Service representative to check the device.
If this test is successful, run the cable loopback test to further isolate the
problem.
Using Loopback Tests 2–9
