User guide

6-24 Encore Multi-port DSU/CSU User GuideÑJuly, 1997
6
Invalid Data is Received with a Mostly Good Menu Display
¥ Reduce the baud rate on the DSU/CSUs and terminal if you are using the maximum
(9600 baud) for communicating with a very large number of DSU/CSUs.
¥ If the cable from the network to the terminal exceeds the 50 ft. maximum, Þx the
length.
¥ Verify that none of the DSU/CSUs are missing an ID and that no two DSU/CSUs
have the same unit ID.
Additional Troubleshooting Tips
If you do not have any test equipment, you must rely on the network to do most of the
troubleshooting for you. You can run several tests from your systemÕs internal
diagnostics.
Running Loopbacks
Running a loopback test enables you to isolate sections of the DSU/CSU to determine
if the DSU/CSU is defective or, in some cases, other outside forces are at work.
No test is 100-percent complete and a small portion of the DSU/CSU remains untested.
The DSU/CSU may allow only one active loopback at a time.
Table 6-6 Additional Troubleshooting Techniques
Problem Description and Location
Running Loopbacks on page 6-24
Running the Pattern Test on page 6-25