Troubleshooting Terminal, Printer and Serial Device Connections - Edition 4 (32022-90030)

30 Chapter 2
Troubleshooting Procedures
Testing the DTC
Testing the DTC
If the DTC is suspected as the cause, TermDSM can be used to
determine the hardware or software component involved. It also
provides DTC dump and reset functions.
CAUTION TermDSM functions described in this section cause all sessions on the
DTC to abort. Data for each session can be lost. Verify that users are
logged off before attempting these tests.
Security level 1 (SM or DI capability) is required for the following
functions. For details on using TermDSM, refer to Chapter 3,
“Introduction to TermDSM,” and Chapter 4, “TermDSM Commands.”
The DUMP DTC command writes data to a disk file from the software
managers serving all the ports on the DTC. The dump file can be read
by an HP support representative for detailed diagnosis of software
faults. After the dump, the DTC selftest is run automatically.
The DTC selftest exercises the following: the DTC processor card, the
serial interface cards, and the connector cards. The selftest runs for
about 2 minutes. After the selftest, the DTC is downloaded and reset
automatically. If you are running TermDSM at the console, messages
will be displayed informing you of the download.
The selftest isolates faults within Field Replaceable Units (FRU) in the
DTC. The faults are indicated by TermDSM messages and by error
codes shown on the DTC’s LED display. For information on servicing
FRUs and reading DTC error codes, refer to the appropriate DTC
Installation and Service Manual for your type of DTC.