Appendix E - Upgrades and Troubleshooting
User Guide
363
<- Packets -> <- Errors ->
From
To
Sent Received
Passes
Data
CTS
DCD
DSR
2 <-> 2
35
35
35
0
0
0
0
4 <-> 5
35
35
35
0
0
0
0
5 <-> 4
35
35
35
0
0
0
0
When this test is run with a cable or connector without the DSR signal (see the pinout dia-
gram for the cable or connector being used), errors will appear in the DSR column. This does
not indicate a problem with the port. In the example above, tstest perceived that a loop-back
connector was attached to port 2 and that a cross cable was used to connect ports 4 and 5.
Port Conversation
This test sends and receives data on the selected port. One way to run this test is to place a
loop-back connector on the port to be tested and begin. Enter the number of the port and a
baud rate (9600 is a typical value). Type some letters, and if the letters appear on the screen,
the port is working. If the letters do not appear on the screen (which also occurs if the loop-
back connector is removed), the port is not functioning correctly.
A second method that can be used to test the port is to connect it to a modem with a straight
cable. Begin the test and type “at”. The modem should respond with “OK”, which will appear
on the screen. Other commands can be sent to the modem or to any other serial device. Press
Ctrl-Q to exit the terminal emulation test.
Test Signals Manually
This test confirms that signals are being sent and received on the selected port. Neither the
loop-back connector nor the cross cable are necessary. Enter the number of the port to be
tested and begin the test.
Figure 39: Initial test
