US Robotics Courier V.34 User manual

COURIER
HIGH SPEED MODEM
Courier V.34 Dual Standard Fax
USER MANUAL

COURIER HIGH SPEED MODEMS
ii How to Use This Manual
HOW TO USE THIS MANUAL
This manual contains operating instructions for Courier Dual
Standard V.34 and Courier V.34 modems.
These modems have many similar features except for the
signaling they use to connect with remote modems at high
speeds: V.32/V.32 terbo, HST, V.FC, or V.34. Courier HST Dual
Standard modems use any type of signaling, depending on the
type of remote modem. V.34 modems can connect at rates up to
28.8K bps.
Below is a brief description of the manual's contents.
•Chapter 1Operating and Compatibility Features
•Chapter 2Installation
•Chapter 3Internal Modem Installation
•Chapter 4Data Mode Commands
•Chapter 5Fax Mode and Call Selection
•Chapter 6Queries and Help commands to display
current settings, operational summaries, and other data
•Background information on protocols, error control,
and throughput
•Summaries and tables
•Alphabetical Command Summary
•Dial Security operations
•Troubleshooting
•Online synchronous and V.25 bis synchronous
operations
•Additional features such as HST Cellular and
voice/data switch
•Procedures for modem testing
•Procedures for upgrading your modem via software
downloads
•Glossary
•Warranty/Service/Certification information

COURIER HIGH SPEED MODEMS
How to Use This Manual iii
A NOTE ON COMMUNICATIONS 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 sometimes, and their software at other times,
depending on the task at hand. Review at least Chapter 4 so
that you have a basic understanding of the modem's require-
ments and operation.

U.S. Robotics, the U.S. Robotics logo, and HST are registered
trademarks of U.S. Robotics, Inc. Courier HST Dual Standard
Fax, Courier V.32 terbo Fax, Total Control, and Adaptive Speed
Leveling (ASL) are trademarks of U.S. Robotics, Inc. V.Fast
Class and V.FC are trademarks of Rockwell International. Any
trademarks, tradenames, service marks or service names owned
or registered by any other company and used in this manual are
the property of their respective companies.

COURIER HIGH SPEED MODEMS
Table of Contents v
TABLE OF CONTENTS
How to Use this Manual ii
Table of Contents v
Limited Warranty ix
FCC Registration Numbers x
IC (Industry Canada) x
Connecting to the Telephone Company x
Radio and Television Interference x
For Canadian Modem Users xi
PART I. INSTALLATION AND OPERATION
Chapter 1Features and Compatibility
Introduction 1-1
Features 1-1
Compatibility 1-6
Fax Standards 1-7
Other Compatibility Features 1-7
Chapter 2External Modem Set-Up
Switches on the Modem 2-1
Front Panel Indicators on the Modem 2-2
Package Components 2-2
What You Need 2-2
An RS-232 Cable 2-2
Communications Software. . . 2-3
Telephone Adapter. . . 2-3
You Should. . . 2-3
Refer to Appendix F. . . 2-3
Refer to Appendix G. . . 2-4
Installing the Modem 2-4
Testing the Installation 2-6
Chapter 3Internal Modem Setup
Package Components 3-1
What You Need 3-1
Communications Software. . . 3-1
A Telephone Adapter 3-2
You Should. . . 3-2
Refer to Appendix F. . . 3-2
Refer to Appendix G. . . 3-2
Before Installing the Modem 3-2
Select a Serial Port 3-3
Select an Interrupt Request (IRQ) 3-4

COURIER HIGH SPEED MODEMS
vi Table of Contents
Reset the Jumpers 3-5
Set DIP Switches 3-6
Installing the Modem 3-6
Testing the Installation 3-8
Chapter 4Data Mode Command Summary
Command Set Usage 4-1
Basic Commands 4-3
Dialing/Answering 4-4
Dialing 4-4
Dial Options 4-4
Cancel Dialing 4-6
Store Phone Numbers 4-7
Redialing 4-7
Answer Mode 4-8
Hanging Up 4-9
Setting/Using Defaults 4-11
Customizing NVRAM 4-12
Resetting the Modem 4-13
Configuration 4-13
Echo/Speaker 4-13
Result Codes 4-14
Additional Result Code Sets 4-17
Modulation 4-19
Error Control/Data Compression 4-19
Data Rates 4-21
RS-232 Signal Operations 4-23
Flow Control 4-24
S-Registers 4-29
Inquiry and Help 4-30
Testing 4-30
International Calls (&Gn, &Pn)4-30
Miscellaneous Commands 4-31
Chapter 5Fax Operations and Call Detection
Fax Operations 5-1
Notes to Programmers 5-3
Call Detection 5-4
Chapter 6Queries and Help Screens
User Inquiries (In)6-1
S-Register Query (Sr?) 6-7
Phone Number Query (&Zn?) 6-7

COURIER HIGH SPEED MODEMS
Table of Contents vii
Last-Dialed Number Inquiry (DL?) 6-8
Stored Command String Query (&ZC?) 6-8
Help Screens 6-8
Stop/Restart Display 6-8
Cancel Display 6-8
Basic Command Set ($) 6-8
Extended Command Set (&$) 6-9
Dialing (D$) 6-10
S-Register Functions (S$) 6-10
Percent Commands (%$) 6-11
PART II. REFERENCE
Appendix ALink Negotiation (Handshaking)
and Error Control
V.34 Handshaking A-1
V.Fast Class (V.FC) Handshaking A-2
U.S. Robotics V.32 terbo to U.S. Robotics V.32 terbo A-2
Other V. Protocol Operations A-3
Dual Standard Handshaking A-4
Error Control and Throughput A-4
V.42 Handshaking A-5
MNP Handshaking A-5
Data Compression A-5
Flow Control A-6
Throughput Guidelines A-7
Typical Throughput A-8
Appendix BSummaries and Tables
The RS-232 Interface B-2
Front Panel Indicators B-5
DIP Switch Summary B-7
Default Settings B-9
Factory Templates
&F1 Hardware Flow Control (Default) B-10
&F2 Software Flow Control B-11
&F3 HST Cellular B-12
&F0 No Flow Control B-13
NVRAM Options B-14
S-Register Summary B-15
ASCII Chart B-28

COURIER HIGH SPEED MODEMS
viii Table of Contents
Appendix CAlphabetical Command Summary
Command Set Usage C-1
Basic Command Set C-2
Ampersand (&) Command Set C-9
Percent (%) Command Sets C-18
Appendix DDial Security/Remote Access
Dial Security D-1
Remote Access D-10
Appendix ETroubleshooting
Appendix FSynchronous and Leased Line Operations
Synchronous F-1
V.25 bis F-4
Online synchronous F-9
Dedicated Line and Leased Line Operations F-15
Appendix GAdditional Operations
Cellular Operations G-2
Voice/Data (External Modems Only) G-4
Hewlett Packard 3000 Installations G-8
MI/MIC Operations (External Modems Only) G-9
Appendix HModem Testing
Testing with &T H-1
Ending a Test&T0, S18 H-1
Analog Loopback&T1, &T8 H-2
&T2 H-4
Digital Loopback&T3 H-4
&T4, &T5 H-5
Remote Digital Loopback&T6, &T7 H-5
Testing with Register S16 H-8
Analog LoopbackS16=1D H-9
Dial TestS16=2 H-9
Test PatternS16=4 H-10
Remote Digital LoopbackS16=8 H-10
Appendix ISoftware Upgrades
Appendix JGlossary
Appendix KTechnical Specifications
Index

COURIER HIGH SPEED MODEMS
Warranty Information ix
LIMITED WARRANTY
U.S. Robotics, Inc., warrants to the original consumer or other
end user purchaser that this product is free from defects in
materials or workmanship for a period of two years from the
date of purchase. During the warranty period, and upon proof
of purchase, the product will be repaired or replaced (with the
same or similar model) at our option, without charge for either
parts or labor. This warranty shall not apply if the product is
modified, tampered with, misused, or subjected to abnormal
working conditions.
REPAIR OR REPLACEMENT AS PROVIDED UNDER THIS
WARRANTY IS THE EXCLUSIVE REMEDY OF THE PUR-
CHASER. THIS WARRANTY IS IN LIEU OF ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING ANY
IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR USE OR PURPOSE, AND U.S.
ROBOTICS SHALL IN NO EVENT BE LIABLE TO
PURCHASER FOR INDIRECT OR CONSEQUENTIAL
DAMAGES OF ANY KIND OR CHARACTER.
Some states do not allow the exclusion or limitation of
incidental or consequential damages or allow limitations on
how long an implied warranty lasts, so the above limitations or
exclusion may not apply to you. This warranty gives you
specific legal rights. You may also have other rights which vary
from state to state.
Should you encounter problems in operating this device, follow
the instructions in Appendix E in Part II of this manual. The
appendix contains solutions to operating problems as well as
procedures to follow if there is an apparent modem
malfunction.

COURIER HIGH SPEED MODEMS
xWarranty Information
FCC REGISTRATION
FCC68: CJEUSA-73130-FA-E
RINGER EQUIVALENCE: 0.4B
FCC15:
CJE-0263 (External modem)
CJE-158-243 (Internal modem)
CJE-0151-243 (Daughterboard)
IC (INDUSTRY CANADA)
This digital apparatus does not exceed the Class B limits for
radio noise emissions from digital apparatus set out in the radio
interference regulations of Industry Canada (formerly Canadian
Department of Communications).
Le present appareil numerique n'emet pas de bruits radio-
electriques depassant les limites applicables aux appareils
numeriques de la classe B prescrites dans le Reglement sur le
brouillage radioelectrique edicte par le ministere des
Communications du Canada.
CONNECTING TO THE TELEPHONE COMPANY
It is not necessary to notify the telephone company before
installing the modem. However, the telephone company may
request the telephone number(s) to which the Courier is
connected and the FCC information printed above.
If the modem is malfunctioning, it may affect the telephone
lines. In this case, disconnect the modem until the source of the
difficulty is traced. Do not use the modem on party or coin
telephone lines.
RADIO AND TELEVISION INTERFERENCE
This equipment generates and uses radio frequency energy,
and, if not installed and used properly in strict accordance with
the manufacturer's instructions, may cause interference to radio
and television reception. Courier high speed modems have
been tested and found to comply with the limits for a Class B
computing device in accordance with the specifications in Part

COURIER HIGH SPEED MODEMS
Regulatory Information xi
15 of FCC rules, which are designed to provide reasonable
protection against such interference in a residential installation.
However, there is no guarantee that interference will not occur
in a particular installation. If this device does cause interference
to radio or television reception, which you can determine by
monitoring reception when the modem is on and off, try to
correct the problem with one or more of the following
measures.
•Reorient the receiving antenna.
•Relocate the computer with respect to the receiver.
•Relocate the computer and/or the receiver so that they
are on separate branch circuits.
If necessary, consult your dealer or an experienced radio/
television technician for additional suggestions. You may find
the following booklet, prepared by the Federal Communications
Commission, helpful:
How to Identify and Resolve Radio-TV Interference
Problems
Stock No. 004-000-0345-4
U.S. Government Printing Office
Washington, DC 20402
In accordance with Part 15 of the FCC rules, any modification to
or tampering with this device that causes harmful interference
to others may be reason for prohibiting future operation.
FOR CANADIAN MODEM USERS
The Industry Canada (formerly DOC) label identifies certified
equipment. This certification means that the equipment meets
certain telecommunications network protective, operational,
and safety requirements. The department does not guarantee
the equipment will operate to a user's satisfaction.
Before installing this equipment, make sure you are permitted
to connect it to the facilities of the local telecommunications
company. You must also install the equipment using an
acceptable method of connection. In some cases, you may also
extend the company's inside wiring for single line individual
service by means of a certified connector assembly (telephone
extension cord). You should be aware, however, that

COURIER HIGH SPEED MODEMS
xii Regulatory Information
compliance with the above conditions may not prevent
degradation of service in some situations.
Repairs to certified equipment should be made by an
authorized Canadian maintenance facility designated by the
supplier. Any repairs or alterations made by a user to this
equipment, or equipment malfunctions, may give the
telecommunications company cause to request the user to
disconnect the equipment.
For your own protection, make sure that the electrical ground
connections of the power utility, telephone lines, and internal
metallic water pipe system, if present, are connected together.
This precaution may be particularly important in rural areas.
WARNING: Do not attempt to make such connections
yourself; contact the appropriate electric inspection authority or
electrician.
Courier High Speed Modems Load Number: 5
The Load Number (LN) assigned to each terminal device
denotes the percentage of the total load to be connected to the
telephone loop used by the device, without overloading. The
termination on a loop may consist of any combination of
devices, subject only to the requirement that the total of the
Load Numbers of all the devices not exceed 100.

COURIER HIGH SPEED MODEMS
Features and Compatibility 1-1
CHAPTER 1. FEATURES AND COMPATIBILITY
INTRODUCTION
Congratulations! The Courier modem you've purchased repre-
sents powerful, advanced electronic design that offers excep-
tional reliability, compatibility and flexibility at all standard
rates up to 28,800 or 28.8K bits per second (bps). The
transmission rate between the computer and modem,
depending on your equipment and software support, can be as
high as 115.2K bps.
Features
The following features and capabilities assure you of superior
reliability and performance.
Connections up to 28.8K bps
With the V.34 standard and the V.Fast Class modulation
scheme, two modems can connect at rates up to 28.8K bps,
twice as fast as the rates of standard ITU-T (formerly CCITT)
V.32 bis modems, which are limited to calls of 14.4K bps or less.
Software Upgrades
Courier high speed modems are now software upgradable,
allowing you quick, easy access to the latest advances in data
communication technology. See Appendix I.
Quick Connect
In V.32 terbo mode, Courier high speed modems can handshake
and start transmitting much faster than typical training times
that range between 9 and 18 seconds for other modems.

COURIER HIGH SPEED MODEMS
1-2Features and Compatibility
Universal Connect
Courier high speed modems automatically detect and connect
at the fastest available speed.
Adaptive Speed Leveling (ASL)
Like most high speed modems, Courier modems fall back to the
next lower speed—for example, 19.2K, then 16.8K in V.terbo
mode—if poor line conditions warrant. In addition, Courier
V.32 bis, and V.32 terbo modems detect improved line conditions
and shift upward again to the next higher speed. both transmit
and receive channels adapt independently, each detecting and
adjusting to line conditions. ASL keeps the modems online,
always operating at the highest possible speed, and constantly
ensuring data integrity.
Fax Capability
You can use your modem with Class 1 or Class 2.0 facsimile
software to exchange faxes with millions of Group III fax
machines worldwide. See Chapter 5.
Error ControlV.42/MNP
Data integrity is ensured when the modems connect with
remote modems that use the V.42 (LAPM), HST, or MNP error
control protocols. Error control is available on calls at 1200 bps
and above.
Data CompressionV.42 bis/MNP5
Data compression enables potential throughput of up to 115.2K
bps on 28.8K bps connections. Couriers connecting under V.42
or HST error control use V.42 bis compression. Couriers
connecting under MNP error control use MNP Level 5
compression. Typical throughput of text and other types of files
using V.42 bis is provided in Appendix A.

COURIER HIGH SPEED MODEMS
Features and Compatibility 1-3
Flow Control/Variable Serial Port Rates
Flow control, required under error control, also allows the local
serial port (DTE) rate to be set higher than the link (connection)
rate, enabling greater efficiency and throughput. If your
equipment and software support high rates, data can be sent
from the computer to the modem at 115.2K, 57.6K, 38.4K or
19.2K bps, regardless of the link rate.
Voice/Data Switch
A switch on the modem's front panel allows you to change from
voice to data and back again, without issuing a command. See
Appendix G.
Stored Command String
If you don't ordinarily use voice and data in the same call, you
can assign the voice/data switch a different function that
normally requires a command, such as resetting the modem or
executing a stored command string. See Voice/Data in Appendix
G for instructions on use of the voice/data switch.
Asynchronous/Synchronous Capability
Courier high speed modems operate synchronously as well as
asynchronously. A personal computer equipped with a
synchronous interface adapter can call computers that use
standard synchronous protocols. See Appendix F for more
information.
Synchronous Operations with V.25 bis
Used with computers that have a synchronous card and port,
Courier high speed modems combine the power of older
modems and automatic calling units in the mainframe
environment. They make synchronous connections by utilizing
V.25 bis, character-oriented (similar to BISYNC) and HDLC
protocols. See Appendix F for more information.
Dial Security
With Dial Security, you will be able to prevent unauthorized
access to a system with the use of Autopass, Prompting, and
Dialback. See Appendix D for more information.

COURIER HIGH SPEED MODEMS
1-4Features and Compatibility
Programmable Nonvolatile Memory
You can tailor your own default settings and store them in non-
volatile random access memory (NVRAM). Each time the
Courier is powered on or reset, it operates at the settings you've
specified. See Chapter 4, Appendix B, and Appendix C.
Link Rate Negotiation
The Courier automatically lowers its link rate to match a lower
rate of a remote modem, in both Originate and Answer Modes,
allowing connections with a wide range of installed modems.
Link Diagnostics
After each call, you can display a Link Diagnostics screen con-
taining information about the last call, including the number of
data characters transferred, line statistics, the call's rate and the
reason the call was disconnected. See Chapter 6.
Modem Diagnostics
ITU-T V.54 loopback testing with the &T command options, and
earlier Courier Register S16 test options are available. The
modem performs three loopback tests: analog, digital, and
remote digital. See Appendix H for information.
Inactivity Timer
You can set the modem to automatically hang up after a speci-
fied number of minutes if there is no activity on the phone line.
See Register S19 in Appendix B.
Call Duration Reporting
The modem records the duration of your calls in hours,
minutes, and seconds. This feature enables you to display and
print an audit of your calling activities. You can optionally use
the modem clock as a real-time clock. See the I3 and I6 screens
in Chapter 6 and the K command in Chapter 4 and Appendix C.
Call Progress Detection
An optional set of result codes (screen messages) lets you know
when a line is busy, a person rather than a modem has
answered the phone, there is no dial tone, or the distant phone
is ringing.

COURIER HIGH SPEED MODEMS
Features and Compatibility 1-5
Modem Settings Displays
On command, the modem displays its current settings, a handy
way to check your transmission rate, S-Registers and other
operational controls. The modem also displays the defaults
stored in nonvolatile memory as well as its default
configuration templates. See Chapter 6.
HELP Screens
The modem displays screens that summarize the command sets,
Dial command options, and S-Register functions. See Chapter
6.
Bottom Panel Reference
Command summaries and other information are printed on the
bottom of the modem case. A Dual In-Line Package (DIP)
switch guide makes it easy to tailor the switch settings to your
terminal or software requirements.
Dialing the Last-Dialed Number
The modem has a buffer that stores each dialed number until it
is cleared by another Dial command. A few keystrokes cause
the modem to redial the number in the buffer without your
having to enter the number again. See the DL command in
Appendix C.
Automated Redialing
You can put the modem into Repeat Mode to continuously
redial if a previous dial attempt fails to connect. This is espe-
cially useful in dialing services whose lines are often busy. See
Chapter 4.
Quote Mode
Set the modem to Quote Mode if you want it to dial an alpha-
betic acronym instead of a numeric number. See Chapter 4.

COURIER HIGH SPEED MODEMS
1-6Features and Compatibility
COMPATIBILITY
The Courier adheres to the following modulation schemes and
standards, ensuring compatibility with a wide base of installed
modems. Unless otherwise indicated, Dual Standard V.34
modems conform to the listed standards.
NOTE: The International Telecommunication Union (ITU-T)
was formerly the International Telegraph and Telephone
Consultative Committee (CCITT).
ITU-T V.34 28.8K/26.4K/24K/21.6K/19.2K/16.8K/14.4K/12K/
9600/7200/4800/2400 bps
V.FC 28.8K/26.4K/24K/21.6K/19.2K/16.8K/14.4K bps
V.32 terbo 21.6K/19.2K/16.8K/14.4K/12K/9600/
7200/4800 bps
HST 16.8K/14.4K/12K/9600/7200/4800 bps (Dual
Standard modems in HST mode with ASL up
to 21.6K bps)
HST Cellular Cellular connections at 12K/9600/7200/
4800/2400/1200/300 bps (Dual Standard
modems in HST mode)
ITU-T V.32 bis 14.4K/12K/9600/7200/4800 bps
ITU-T V.32 9600/4800 bps
ITU-T V.22 bis 2400 bps
Bell 212A 1200 bps (also V.22)
ITU-T V.23 1200 bps with 75 bps back channel (some U.K.
and European phone systems)
ITU-T V.25 Answer sequence for calls originating outside
the U.S. and Canada
ITU-T V.25 bis For synchronous communications using
HDLC and character-oriented protocols
Bell 103 300 bps (ITU-T V.21 optional)
ITU-T V.42 LAPM error control, 1200 bps and higher
ITU-T V.42 bis Data compression, 1200 bps and higher

COURIER HIGH SPEED MODEMS
Features and Compatibility 1-7
MNP Levels 2, 3 and 4 error control, level 5 data
compression, 1200 bps and higher
ITU-T V.54 Analog, digital and remote digital loopback
testing
Fax Standards
The Courier modem provides Group III-compatibility when
combined with Class 1 or Class 2.0 fax software. In addition,
the modem adheres to the following standards.
TIA/EIA-578 Service Class 1 Asynchronous Facsimile
DCE Control Standard
TIA/EIA-592 Service Class 2.0 Asynchronous Facsimile
DCE Control Standard
ITU-T V.17 14.4K/12K bps
ITU-T V.29 9600/7200 bps
ITU-T V.27 ter 4800/2400 bps
ITU-T V.21 300 bps
Other Compatibility Features
Other compatibility features include the following standards
and certification:
•Can be used with any computer or terminal that is com-
patible with the RS-232 standard interface.
•Can be used with any computer or terminal that uses
ASCII, the standard character code supported by most
equipment manufacturers.
•Is fully FCC- and IC-certified for the uses described in
this manual.

COURIER HIGH SPEED MODEMS
External Modem Set Up 2-1
CHAPTER 2. MODEM SET UP
HS AA CD OH RD SD TR MR RS CS SYN ARQ/
FAX VOICE/DATA V.34 Fax with
V.FC and V.32 bis
Figure 2.1—Courier V.34 Modem
Reminder
To prevent overheating, do not cover the vents on the top of the
modem case.
SWITCHES ON THE MODEM
Voice/Data
This push-button switch is used primarily to switch between
voice and data communications during a call. Detailed
instructions are in the Voice/Data Calls section in Appendix G.