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-10
Remote Loopback Test with Self-Test
Figure D-5. Remote Loopback Test with Self-Test
Performing a Remote Loopback Test with
Self-Test
To initiate the test, set up a data call and escape to command mode (+++). Then
type:
AT&T7
This test will continue for the period of time indicated in S-register S18. To
terminate the test before the test timer expires, type:
AT&T0
The system responds with the error count, then the completion signal:
000
OK
Remote DTE
Local DTE
8400B Plus
Transmitter
Test Circuit
Receiver
Remote
Data Endpoint
Receiver
Transmitter
S
W
I
T
C
H
ENTER
ENTER
020709_2.book Page 10 Friday, April 23, 1999 5:39 AM