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

56 Chapter 4

TermDSM Commands

DI[AG] XE[XTERNAL]

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: