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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, de-
pending on the type of remote modem.
As you use the manual, keep the
following guidelines in mind.
ù The modem is shipped ready for most
dial-up applications 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.
ù 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.
ù All Courier high speed modems
connect automatically with remote
modems operating at 14.4K/12K/9600/
7200/4800/2400/1200/300/110 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
16.8K bps.
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 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.
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.
Most users will be making asynchronous
calls. If you'll be making synchronous
calls to a mainframe, you'll find all
essential information in Chapter 7.
However, you may find it helpful to
review the more detailed operating
instructions in other chapters as well.
The USRobotics logo and HST are
registered trademarks of U.S. Robotics,
Inc. Courier HST, Courier HST Dual
Standard, Courier V.32 bis, 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.
COURIER HIGH SPEED MODEMS
TABLE OF CONTENTS
How to Use this Manual ii
Table of Contents v
Limited Warranty x
FCC Registration Numbers xi
Connecting to the Telephone Companyxi
DOC (Canada) xi
Radio and Television Interferencexii
For Canadian Modem Users xiii
PART I. INSTALLATION AND OPERATION
CHAPTER 1êFeatures and Compatibility
Introduction 1-1
Compatibility 1-4
CHAPTER 2êSet-Up and Testing
Package Components 2-1
Operational Requirements 2-1
RS-232 Requirements 2-2
Front Panel Switches 2-3
Front Panel Indicators 2-4
Installing the Modem 2-4
Testing the Installation 2-7
CHAPTER 3êQuick Start: Asynchronous
Calls
Asynchronous/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
CHAPTER 4êInterface Controls
Terminology 4-1
Table of Contents v
COURIER HIGH SPEED MODEMS
Changing Settings 4-2
High Speed Modulation: HST/V.32 bis 4
-2
Modulation at 2400 bps and Below4-3
Throughput Guidelines 4-3
Error Control 4-5
With Auto Answer 4-6
Flow Control Overview 4-6
Transmit Data Buffer Sizes 4-6
Received Data Buffer Size 4-6
Transmit Data Flow Control (&Hn)4-7
When it is Required 4-7
Hardware Control 4-7
Software Control 4-7
Guidelines 4-8
Received Data Flow Control 4-9
Hardware Control (Rn) 4-9
Software Control (&In) 4-9
Guidelines 4-11
Data Compression (&Kn) 4-12
Data Rate Commands 4-13
Software Requirements 4-13
DTE Rate Select (&Bn) 4-14
Link Rate Select (&Nn) 4-15
Guidelines for Low Speed Calls4-16
Data Set Ready (&Sn) 4-16
Data Terminal Ready (&Dn) 4-17
Carrier Detect (&Cn) 4-17
Rack Controller Unit Access (%Rn)4-18
Touch-Tone Recognition (%Tn) 4-18
CHAPTER 5êInternal Controls
Setting/Using Defaults 5-1
Writing Defaults to NVRAM (&W)5-1
Loading the Factory Defaults (&F) 5
-2
Reset (Z) 5-3
Storing Telephone Numbers (&Zn=s) 5
-3
Result Codes 5-4
Response Modes (Vn) 5-4
Quiet Mode (Qn) 5-5
vi Table of Contents
COURIER HIGH SPEED MODEMS
Additional Result Code Subsets (&An) 5
-5
Result Code Sets (Xn) 5-6
Local Echo 5-9
Command Mode Local Echo (En) 5-9
Online Local Echo (Fn) 5-9
The Audio Monitor 5-10
Speaker Control (Mn) 5-10
Modem Clock Usage (Kn) 5-11
Table of Contents vii
COURIER HIGH SPEED MODEMS
Transmitter Enable/Disable (Cn)5-11
Break Handling (&Yn) 5-11
S-Registers 5-12
CHAPTER 6êAsynchronous Dialing and
Answering
Before Connecting 6-1
Modulation/Standards 6-1
Setting the Transmission Rate6-2
Data Format 6-2
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
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
Returning Online (O) 6-11
Hanging Up (Hn) 6-11
Automatic Answering 6-11
Suppressing Auto Answer 6-12
Points to Remember 6-12
International Calls 6-12
Handshaking Options (Bn) 6-12
viii Table of Contents
COURIER HIGH SPEED MODEMS
Guard Tone (&Gn) 6-13
Pulse Dial Make/Break Ratio (&Pn) 6
-13
Table of Contents ix
COURIER HIGH SPEED MODEMS
Chapter 7êSynchronous Operations
Overview 7-1
Data Rate Synchronization 7-1
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 Guidelines7-3
Flow Control Guidelines 7-4
Transmit Clock Source (Xn) 7-4
Synchronous Mode (&M1) 7-5
Dialing Out 7-5
Answering 7-5
Hanging Up 7-6
Additional Terminology 7-6
Chapter 8êQueries and Help Screens
User Inquiries (In) 8-1
S-Register Query (Sr?) 8-6
Phone Number Query (&Zn?) 8-6
Last-Dialed Number Inquiry (&ZL?)8-6
Help Screens 8-6
Stop/Restart Display 8-6
Cancel Display 8-6
Basic Command Set ($) 8-7
Extended Command Set (&$) 8-7
Dialing (D$) 8-8
S-Register Functions (S$) 8-9
PART II. REFERENCE
Appendix AêLink Negotiation (Handshaking)
and Error Control
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
x Table of Contents
COURIER HIGH SPEED MODEMS
Flow Control A-7
Throughput Guidelines A-7
Achievable Throughput A-9
Appendix BêSummaries 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 CêAlphabetical Command Summary
Basic Command Set C-1
Extended Command Set C-6
Percent Command Set C-11
Appendix DêProblems and SolutionsD-1
If You Still Have Problems D-4
Appendix EêAdditional Operations
Voice/Data E-2
High Speed/Low Speed Protocol E-5
Dedicated Line and Leased Line Operation
E-8
Hewlett Packard 3000 InstallationsE-11
MI/MIC Operations E-12
Appendix FêModem Testing
Testing with &T F-1
Ending a Testê&T0, S18 F-1
Analog Loopbackê&T1, &T8 F-2
&T2 F-4
Digital Loopbackê&T3 F-4
&T4, &T5 F-5
Remote Digital Loopbackê&T6, &T7F-5
Testing with Register S16 F-8
Analog LoopbackêS16=1D F-8
Dial TestêS16=2 F-9
Test PatternêS16=4 F-9
Remote Digital LoopbackêS16=8F-10
Appendix GêGlossary G-1
Table of Contents xi
COURIER HIGH SPEED MODEMS
Appendix HêTechnical SpecificationsH-1
Index
xii Table of Contents
COURIER HIGH SPEED MODEMS
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 PURCHASER. 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, and you may also have other
rights which vary from state to state.
To obtain service under this warranty,
contact the U.S. Robotics Technical
Support Department at 800/982-5151 or by
x Warranty
COURIER HIGH SPEED MODEMS
mail at 8100 North McCormick Blvd.,
Skokie, Illinois, 60076-2920. You will
be given a Return Materials
Authorization (RMA) number to help us
keep track of your warranty request.
Once you have received your RMA number,
take or mail the product, postage
prepaid, to U.S. Robotics at the above
address. Include proof of the date of
purchase. IMPORTANT: If you ship your
unit, pack it securely, be sure your RMA
number is visible on the outside of the
package, and ship it charges prepaid and
insured.
Should you encounter problems in
operating this device, follow the
instructions in Appendix D 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.
Warranty page
COURIER HIGH SPEED MODEMS
FCC REGISTRATION
FCC68: CJE794-72748-MD-E
RINGER EQUIVALENCE: 0.4B
FCC15: CJE-0147-151
DOC (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
the 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 telephone company has any
questions or raises problems, ask them
to call the Technical Support
Department, USRobotics, Inc., 800/982-
5151.
If the modem is malfunctioning, it may
affect the telephone lines. In this
case, disconnect the modem until the
Regulatory Information xi
COURIER HIGH SPEED MODEMS
source of the difficulty is traced. Do
not use the modem on party or coin
telephone lines.
xii Regulatory Information
COURIER HIGH SPEED MODEMS
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 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:
Regulatory Information xiii
COURIER HIGH SPEED MODEMS
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.
xiv Regulatory Information
COURIER HIGH SPEED MODEMS
FOR CANADIAN MODEM USERS
The Canadian Department of
Communications (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 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
Regulatory Information xv
COURIER HIGH SPEED MODEMS
precaution may be particularly important
in rural areas.
CAUTION: Do not attempt to make such
connections yourself; contact the
appropriate electric inspection
authority or electrician.
Courier High Speed Modems Load
Number: 41B
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. An alphabetic suffix is also
specified in the Load Number for the
appropriate ringing type (A or B), if
applicable. For example, LN = 41B
designates a Load Number of 41 and a B-
type ringer.
xvi Regulatory Information
