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7.2.2.7 Offline Test 7 - Echo Test -
This test requests the operator to enter
ports and their line characteristics. The input format is identical to Offline Test
2 (See Section 7.2.2.2).
After the last port details have been entered, RETURN is typed in response to
the prompt for port number. The test then starts immediately. No further in-
formation will be displayed on the screen during the test, other than that
shown in Figure 7-6. The test operates continuously until the HALT
(CONTROL-C) command is executed on the supervisor port.
To test each of the selected ports, connect a terminal set to the correct speed
and characteristics, to the port. All characters typed on the keyboard should be
echoed on the terminal exactly as input.
DFMZA
8 LINE STAT MUX
OFFLINE DIAGNOSTIC
Echo test
Port No
0
1
2
3
4
5
6
7
SPEED
9600 4800
ERR
300
110
ERR
ERR
1200
CHAR LEN
8
8
*
7
7
*
*
8
STOP BTS
1
1
*
2
2
*
*
1
PARITY
N
N
*
0
E
*
*
N
Figure 7-6 Asynchronous Port Echo Test
7.2.2.8 Offline Test 8 - Modem Control Test -
This test exercises the modem
control signals of the eight asynchronous ports and the two composite ports.
Ensure that a loopback connector (Part No. H325) is inserted in all eight asyn-
chronous ports and the two composite RS-232-C ports. The DSR A and B indi-
cators should be on. When selected, the test runs immediately and the
cumulative number of passes is displayed as shown in Figure 7-7.
If
a hardware
fault exists or a loopback connector is not fitted, messages reporting the failure
will appear at the bottom of the screen.
The test continues until the HALT command (CONTROL-C) is executed.
CHAPTER 7 DIAGNOSTICS
23
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