HPlogo Troubleshooting Terminal, Printer, and Serial Device Connections: HP 3000 MPE/iX Computer Systems > Chapter 4 TermDSM Commands

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Determines if the SNP hardware and the physical connection is functioning properly. The external loopback test is executed only if the SNP is not started. External connections are required only for the V.35, the V.36, and the RS-422 interface. (External loopback is not available for the DTC 72MX.)

Security level: 2.

Syntax

XE[XTERNAL] dtcnum,cardnum

Parameters

dtcnum

The number TermDSM associates with a particular DTC. The DTC command lists each DTC with its assigned number. This list is also printed when you make a mistake while typing in a DTC number.

cardnum

Number of the interface card within the DTC to which the device is connected. The cards are numbered from zero beginning at the bottom of the DTC. (Note that SNP cards may not be mounted in slot 0 or 1 for DTC 16, and slot 0 for DTC 48.)

Description

Determines if the SNP hardware is functioning properly. This internal loopback test is executed only if the SNP is not started (X25 Level 1, 2, and 3). External connections are required only for the V.35, the V.36, and the RS-422 interface.

All loopback tests are disruptive in the sense they will abort any existing VC connections on that SNP. Other SNPs in the DTC will not be effected.

When the subcommand is entered the following question is asked:

     Do you want to stop looping if an error is found (yes/no)?

If you answer yes, the loopback tests will stop if an error is encountered. The following is then printed on the terminal:

     Please put a loopback hood on the port before answering the
     "How many times?" question. (TDSM 113)
     How many times do you want to repeat this operation?

Enter the number of times you want to run this diagnostic function. Enter a number between 1 and 65535. The following is then printed on the terminal:

     Type CONTROL - Y to stop the looping.

You can use subsystem break (normally [CTRL]-Y to stop the diagnostic at any time. The diagnostics prompt will be printed and you will be allowed to enter another subcommand.

If TermDSM knows that this test has failed, an error message will be printed listing the reason for the failure and how many milliseconds the test ran before failing. The diagnostics prompt will be printed and you will be allowed to enter another subcommand.



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