US Robotics COURIER User manual

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lli1 'ilobotics ®
COURIER ™
HIGH SPEED
MODEMS
COURIER HST Dual Standard™ with ASL™
COURIER
HST Dual Standard FAX™ with ASL™
COURIER
V.32 bis™ with ASL™
COURIER V.
32 bis FAX™ with ASL™
COURIER HST™
with ASLTM
COURIER HST FAX™ with ASL™
USER'S
MANUAL
~

lliHllobotics ®
COURIER ™
HIGH SPEED
MODEMS
COURIER HST Dual Standard™ with ASL™
COURIER
HST Dual Standard FAX™ with ASL™
COURIER
V.32 bis™ with ASL™
COURIER
\/. 32 bis FAX™ with ASL™
COURIER HST™
with ASL™
COURIER
HST FAX™ with ASL™
USER'S
MANUAL
~1992 by U.S. Robotic., Inc.
8100 North McCormick Blvd.
Skokie,
IL 60076
All Rights Reserved

COURIER HIGH SPEED MODEMS
HOW TO USE THIS MANUAL
This manual contains operating instructions for Courier V.32 bis,
Courier HST, and Courier HST Dual Standard modems. These
modems have identical features except for the signaling they use
to connect with remote modems at high speeds: V.32/V.32 bis or
HST. Courier HST Dual Standard modems use either type of
signaling, depending on the type of remote modem.
As you use the manual, keep the following guidelines in mind.
• The modem is shipped ready for most dial-up applica-
tions except for its flow control setting,
which depends
on the type of software and machine you're using. After
you've set up the modem and tested its operation
(Chapter 2) review the Quick-Start instructions in
Chapter 3 for brief configuration guidelines.
• If you've purchased a Courier V.32 bis modem,
disregard the instructions in this manual concerning
HST operations. Conversely, if you've purchased a
Courier HST modem, disregard the instructions
concerning V.32/V.32 bis operations.
• All Courier high speed modems connect automatically
with remote modems operating at 14.4K/12K/9600/
7200/ 4800/2400/1200/300 bps, as long as the remote
modems observe the standards listed under
Compatibility in Chapter 1. Courier HST modems also
connect
with other Courier HST modems at 16.SK bps.
A NOTE ON COMMUN/CATIONS SOFTWARE
If you're using a computer rather than a terminal, you need
communications software. Many brands are available, all of
which are based on the modem's AT command set.
Some users prefer their communications software to take control
of the modem, and are more comfortable with a program that
makes the modem almost transparent. Others prefer a program
that allows them to use the modem's AT command set some-
times, and their software at other times, depending on the task at
hand. Whichever you prefer, review at least the Quick Start
(Chapter 3) so that you have a basic understanding of the
modem's requirements and operation.
ii How to Use This Manual
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COURIER HIGH SPEED MODEMS
USER PATHS
The paths shown in the diagram are suggestions only, designed
for new and experienced users. Note that there is no separate
path for HST-mode or V.32 bis mode operation.
All
Users
Ch.1
Features &
Compatibility
Ch. 2
Set-up &
Testing
I
Synchronous
Calls
Ch. 7
Synch.
Operations
New
Users
I
Ch. 4
Interface
Controls
I
Ch. 5
Internal
Controls
I
Ch. 6
Dialing &
Answering
,__
Asynchronous Calls
r- - ,
I I
-I Glossary I
L-,--1
r-1-,
I Ch. 8 I
I
Inquiries/ I
HELP
L __ _j
App. A
Error Control,
Compression
I
Advanced
Users
Ch. 3
Quick
Start
In Ch. 4
Throughput
Guidelines
In App. B
Default
Settings
r--,
I In Ch. 8 I
ATl6--Link I
I Diagnostics
L __ _j
Dashed lines indicate optional references. Additional points of reference:
Page Page
3-1 HST and V.32/V.32 bis Modes E-2
Fax Operations
(Fax modems only)
B-4 Front Panel Indicators
B-9 Nonvolatile
Memory-Storing
Your Defaults
B-12 S-Registers
E-3 Voice/Data Switch
Quick Configuration Guide
Quick Reference Card
How to Use This Manual iii

The USRobotics logo and HST are registered trademarks of U.S.
Robotics, Inc.
Courier HST, Courier HST Fax, Courier HST Dual
Standard, Courier HST Dual Standard Fax, Courier V.32 bis,
Courier V.32 bis Fax, Total Control, and Adaptive Speed
Leveling (ASL) are
trademarks of U.S. Robotics, Inc. Apple is a
registered
trademark of Apple Computer, Inc. Hewlett Packard
3000 is a trademark of Hewlett Packard Company. IBM PC,
PC/XT,
PC/ AT and Systems Network Architecture (SNA) are
trademarks of International Business Machines Corp. Microcom
Networking Protocol (MNP) is a trademark of Microcom, Inc.
Touch-Tone is a
trademark of American Telephone and
Telegraph.
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COURIER HIGH SPEED MODEMS
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-TABLE OF CONTENTS
How to Use this Manual
ii
Table of
Contents
v
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Limited Warranty
x
FCC Registration
Numbers xi
DOC (Canada) XI
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Connecting to the Telephone Company
XI
Radio and Television Interference xii
For Canadian Modem Users xiii
PART I. INSTALLATION AND OPERATION
Chapter 1-Features and Compatibility
Introduction
1-1
Compatibility
1-4
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Chapter 2-Set-Up and Testing
Package Components
2-1
Operational Requirements
2-1
-RS-232
Requirements
2-2
Switches 2-3
Front Panel Indicators
2-4
-Installing
the Modem
2-4
Testing
the Installation 2-7
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Chapter 3-Quick Start: Asynchronous Calls
Asynchronous I Synchronous Communication
3-1
Initial Modem Settings
3-1
Recommended Settings 3-2
Alternative Settings 3-3
Data Format
3-4
Storing Defaults in Nonvolatile Memory
3-5
-Dialing 3-5
Link Rate
Negotiation
3-5
Online Fallback 3-6
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Chapter 4-Interface Controls
Terminology
4-1
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Changing Settings 4-2
High Speed Modulation: V.32 bis/HST
4-2
Modulation at 2400 bps and Below 4-3
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Throughput Guidelines
4-3
Table of Contents v

COURIER HIGH SPEED MODEMS -
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Error Control (&Mn)
4-5
With Auto Answer
4-6
Flow Control Overview
4-6
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Transmit Data Buffer Sizes
4-6
Received Data Buffer Size
4-6
Transmit Data Flow Control (&Hn)
4-7
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When it is Required
4-7
Hardware Control
4-7
Software Control
4-7
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Guidelines
4-8
Received Data Flow Control
4-9
Hardware Control (Rn)
4-9
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Software Control (&In)
4-9
Guidelines
4-11
Data Compression (&Kn)
4-12
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Data Rate Commands
4-13
Software Requirements
4-13
DTE Rate Select (&Bn)
4-14
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Link Rate Select (&Nn)
4-15
Data Set Ready (&Sn)
4-16
Data Terminal Ready (&On)
4-17
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Carrier Detect (&Cn)
4-18
Rack Controller Unit Access (%Rn)
4-18
Touch-Tone Recognition (% Tn)
4-18
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Chapter 5-Internal Controls
Setting/Using Defaults
5-1
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Writing Defaults to NVRAM (&W)
5-1
Loading the Factory Defaults (&F)
5-2
Reset (Z)
5-3
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Storing a Command String (&ZC=s)
5-3
Storing Telephone Numbers (&Zn=s)
5-4
Result Codes
5-4
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Response Modes (Vn)
5-5
Quiet Mode (Qn)
5-5
Additional Result Code Subsets (&An)
5-6
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Result Code Sets (Xn)
5-7
Local Echo
5-9
Command Mode Local Echo (En)
5-9
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Online Local Echo (Fn)
5-9
The Audio Monitor
5-10
Speaker Control (Mn)
5-10
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Modem Clock Usage (Kn)
5-11
vi
Table of Contents
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COURIER HIGH SPEED MODEMS
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Transmitter Enable/Disable (Cn)
5-11
Break
Handling (&Yn) 5-11
-S-Registers 5-12
Chapter 6-Asynchronous Dialing and Answering
Before Connecting
6-1
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Modula ti on I Standards
6-1
Setting the Transmission Rate 6-2
Data Format
6-2
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Error Control
6-2
Placing Calls 6-3
Dial (D) 6-3
-Cancel Dialing 6-3
Dialing Type,
Pulse or Tone
6-4
Adaptive Dialing (X2-X7) 6-4
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Pause(,)
6-4
Slash(/) 6-5
Wait for Another Dial Tone (W) 6-5
-Dial
and Return to Command Mode (;)
6-5
Dialing Letters(") 6-5
Transferring Calls (!) 6-6
Wait for an Answer(@) 6-6
Reversing
Originate/ Answer Frequencies (R)
6-7
Dialing a
Stored Number (DSn) 6-7
-Redialing 6-7
Dial
the Last Dialed Number (DL) 6-8
Re-execute
the Last Command (A/)
6-8
Automated Redialing(>, A>) 6-8
Continuous Repeat (>) 6-9
Continuous Re-Execute (A>) 6-9
Exiting
Repeat Mode
6-9
Escape
Code Operations ( +++)
6-9
Modem Response to +++
6-10
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Returning Online ( 0)
6-11
Hanging Up (Hn) 6-11
Automatic Answering
6-11
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Suppressing Auto Answer
6-12
Points to
Remember
6-12
International Calls 6-12
Handshaking Options (Bn) 6-12
Guard Tone (&Gn) 6-13
Pulse Dial Make/Break Ratio (&Pn)
6-13
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-Table
of Contents vii

COURIER HIGH SPEED MODEMS -
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Chapter 7-Synchronous Operations
Overview
7-1
Data Rate Synchronization 7-1
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Protocol Compatibility 7-1
Requirements 7-1
What You Need to Know 7-2 -
The RS-232 Interface 7-2
The Synchronous Adapter Card 7-2
Setting
the Modem
7-3 -
Modulation/Link Rate Guidelines 7-3
Flow
Control Guidelines
7-4
Transmit Clock Source (Xn) 7-4 -
Synchronous Mode (&Ml)
7-5
Dialing
Out
7-5
Answering
7-6 -
Hanging Up 7-6
Chapter 8-Queries and Help Screens
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User Inquiries (In)
8-1
S-Register Query (Sr?) 8-6
Phone Number Query (&Zn?) 8-6
Last-Dialed Number Inquiry (DL?) 8-6 -
Help Screens 8-6
Stop /Restart Display
8-6
Cancel
Display 8-7 -
Basic Command Set ($)
8-7
Extended Command Set(&$) 8-7
Dialing (D$) 8-8 -
S-Register Functions (S$)
8-9
PART II. REFERENCE -
Appendix A-Link Negotiation (Handshaking)
and Error Control
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Link Negotiation (Handshaking)
A-1
HST Mode
A-1
V.32
bis Mode
A-3 -
Dual Standard Handshaking
A-5
Error
Control and Throughput
A-5
CCITT V.42
Handshaking
A-6 -
MNP Handshaking
A-6
Data
Compression
A-6
Flow
Control
A-7 -
viii Table
of Contents -

COURIER HIGH SPEED MODEMS
Throughput Guidelines A-7
Achievable Throughput
A-9
Appendix B-Summaries and Tables
The RS-232 Interface
B-2
Front Panel Indicators
B-4
DIP Switch Summary
B-6
Default Settings
B-9
S-Register Summary
B-12
-ASCII
Chart
B-21
Appendix C-Alphabetical Command Summary
Requirements
C-1
-Basic
Command Set
C-1
Ampersand Command Set C-6
Percent Command Set C-11
-Remote Access
Commands
C-11
Appendix D-Problems and Solutions
D-1
Appendix E-Fax and Other Operations
Fax Operations
E-2
Voice/Data
E-3
Remote Configuration
E-7
High Speed I Low Speed Protocol E-13
Dedicated Line and Leased Line Operation
E-16
Hewlett Packard 3000 Installations E-19
Ml/MIC Operations
E-20
Appendix F-Modem Testing
Testing with &T
F-1
Ending a Test-&TO, S18
F-1
Analog Loopback-&Tl, &TS
F-2
&T2 F-4
Digital Loopback-&T3
F-4
&T4, &TS
F-5
Remote Digital Loopback-&T6, &T7 F-5
Testing with Register S16 F-8
Analog Loopback-S16=1D
F-8
.....
Dial Test-S16=2
F-9
Test Pattern-S16=4
F-9
Remote Digital Loopback-S16=8
F-10
Appendix G-Glossary
G-1
Appendix H-Technical Specifications
H-1
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Index
-Table
of Contents
ix