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7.2.2.3 Offline Test 3 - Asynchronou!; Internal Logic Test -
The
Asynchronous Internal Logic Test runs immediately after being selected. The
test will show a display similar to Figure 7-3. The number of successful passes
of the test are displayed. The test loops continuously until the HALT
(CONTROL-C) command is executed. The response to the HALT command
may take up to 30 seconds, as the conlmand will not be recognized until the
end of the current test cycle.
The test transmits data over all eight asynchronous ports. The data is looped
back internally to the port input and read from the input SILO by the mi-
croprocessor. The received data is comlpared against the originally transmitted
data. The test exercises each port at all the available speeds and port param-
eters. For this reason each test cycle ean take up to 30 seconds.
() FMZA
8 LINE: STAT MUX
OFFLINE DIAGNOSTIC
Asynchronous internal logic test
PASS
11
Figure 7-3 Asynchronous Internal Logic Test
7.2.2.4 Offline Test 4 - Composite ElCternal Port Test -
This test requests the
operator to select the composite port to be tested: A, B, or both, as shown in
Figure 7-4.
Before typing A, B, or RETURN, you must insert the appropriate loopback
connector for the system configuration currently in use. The configuration is
set up with the "SYSTEM" command.
If
it is set for long line drive and you
use an RS-232 loopback, expect errors. Also, if a loopback connector is con-
nected when not in maintenance mode, expect the error message
"SYNCHRONOUS PORT CONNECTION ERROR", because you have the
port looped back on itself.
The test then runs immediately and displays the number of passes. The test
will select either RS-232 MODEM/NO MODEM, or LONG LINE DRIVE, de-
pending on the system setup. The link speed will also be taken from the sys-
tem setup.
The operator must ensure that the channel(s) being tested are looped back.
Loopback may be achieved in a variety of ways. These are listed in order of
increasing distance from the DECmux II unit under test.
CHAPTER 7 DIAGNOSTICS
19
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