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4.3.5 Diagnostic Tests
Having exhausted item 4.3.1 to 4.3.4, the functionality of each of the compos-
ite link components can be verified by using the diagnostic test facilities on the
DECmux II and the MUXserver 100. Figure 4-3 summarizes all the loopback
tests available from the MUXserver 100 supervisor port. The 'LOOP' command
and the 'START TEST PORT n LOOPBACK' command are entered in re-
sponse to the LOCAL> prompt. All the others are selected by means of the
TEST command in the communications sub-directory (that is, in response to
the COM> prompt).
4.3.5.1 Diagnostic Tests with the Composite Link Installed -
•
On the MUXserver 100
With all the composite link components connected, log on to the
'privileged mode' of the supervisor port and enter 'COM' to access
the COMMUNICATIONS sub-directory of commands.
Select the 'TEST' command and answer 'YES' to the prompted ques-
tion. Select the 'Composite Port External Test' (Test No 3) in re-
sponse to the displayed prompt and select the failed composite port
(that is, 'A' if Port A is the suspect connection). This test will verify
the functionality of this link.
Refer to Chapter 7, Section 7.2.2.4 (Offline Test 4 - Composite
External Port Test) for details of the 'Composite External Port' test.
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CHAPTER 4 MUXserver 100 TROUBLESHOOTING
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