User's Guide
Table Of Contents
- Table of Contents
- About This Document
- 1. Introduction
- 2. Installation
- 3. Configuration and Operation
- 4. Troubleshooting
- A. AT Command Set
- B. Dial Modifiers
- C. S-Registers
- D. Isolating Problems Using Loopback Data Tests
- E. Quick-Reference Summaries
- Glossary
- Index
8400B Plus Data Module User’s Guide
555-020-709
Issue 2
November 1996
Isolating Problems Using Loopback Data Tests
D-4
Local Loopback Test
Performing a Local Loopback Test
To initiate the test, type:
AT&T1
Type any string of characters. Compare the characters on the screen with those
you typed. If the data does not match, troubleshoot your EIA Connector cord
and terminal. If these are operating correctly, your data module may be
defective. Call the Lucent Technologies Technical Service Center at
1 800 242-2121.
This test will continue for the period of time indicated in S-register S18. To
terminate the test before the test timer expires, type:
+++
The system responds with:
OK
Type:
AT&T0
The system responds with:
OK
ENTER
ENTER
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