Service manual

69Chapter 7 Upgrades and Troubleshooting
Cyclades-TS Installation & Service Manual
step 1) signal_ras stop.
step 2) Perform all hardware tests needed.
step 3) signal_ras start.
Port Test
Either a cross cable or a loop-back connector is necessary for this test. Their pinout diagrams are supplied in
appendix B. Connect the loop-back connector to the modem cable and then connect the modem cable to the
port to be tested (or connect a cross cable between two ports to be tested). In the case of the TS100, connect
the DB-25 loop-back connector to the console cable using a DB-9 - DB-25 convertor. When tstest senses the
presence of the cable or connector, the test will be run automatically and the result shown on the screen.
Each line of data correponds to a port in test. The last 4 columns (DATA, CTS, DCD, and DSR) indicate errors.
The values in these columns should be zero. The figure below is an example of the output screen.
<- 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 diagram 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