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
Troubleshooting
4-3
How to Use This Chapter
Call disconnects
immediately after an
attempt to connect;
NO CARRIER may
be displayed on the
local terminal
device; green LED
turns off, red LED is
on.
The speed of the
far-end device is
higher than the
speed of the local
terminal device.
Change the speed of the local terminal
device to match that of the far-end
device. If the speed of the far-end
device is not known, set the local
terminal device to the highest speed
available.
The far-end device
is set up for
half-duplex or
synchronous
operation.
The 8400B Plus Data Module cannot
communicate with a far-end device that
is operating half-duplex or
synchronous. This problem can be
resolved only if the far-end device can
be reconfigured for full-duplex,
asynchronous operation.
Table 4-1. Troubleshooting Guidelines
Symptom Problem Solution
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