2.3.2 General Test Procedure
Test one line at a time, starting from the synchronous port on the
DEC MicroServer and working towards the remote modem. Use the tests in
the following order:
1.
Synchronous port on the DEC MicroServer or the DEC MicroServer–SP
2.
Adapter cable
3.
Modem cable
4.
Local modem
5.
Remote modem
The first test to fail shows where the communications link is faulty. For
example, if the tests on the DEC MicroServer port and the adapter cable
succeed but the test on the modem cable fails, it is likely that the modem cable
is faulty.
2.3.3 The test Command
To do the testing, use the DEC MicroServer’s remote console facilities. (See
Appendix D for information on the DEC MicroServer’s remote console facility
and commands.) Use the TEST command to perform each loopback test. Each
time you use the TEST command to perform a loopback test, it displays one of
the following messages:
•
If the test is successful:
Successful Data Loopback on Channel
n
•
If the test fails:
Data Loopback Test Failed on Channel
n
In both messages, the appropriate port number appears in place of n.
2.3.4 Sample Test Procedure
The following sections describe how to test a DEC MicroServer communications
link with the loopback test.
2–12 Using Loopback Tests
