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
-
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
~
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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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
-
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 -
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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

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 PUR-
CHASER. THIS WARRANTY
IS IN LIEU OF ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING ANY
IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS
FOR
AP ARTICULAR 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 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 Din 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.
x Warranty
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COURIER HIGH SPEED MODEMS
FCC REGISTRATION
DOC (CANADA)
FCC68: CJEUSA-73130-FA-E
RINGER EQUIVALENCE: 0.4B
FCC15: CJE-0151-147
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 source of the
difficulty is traced. Do not use the modem on party or coin
telephone lines.
Regulatory Information xi

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 I 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.
xii Regulatory Information
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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
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: 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.
Regulatory Information xiii

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COURIER HIGH SPEED MODEMS
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 14,400 bits per second (bps). Courier HST modems
connect with each other at up to 16,800 bps. The transmission
rate between the computer and modem, depending on your
equipment and software support, can be as high as 57,600 bps.
The following features
and capabilities assure you of superior
reliability and performance.
High Speed Calls-Adaptive Speed Leveling (ASL)
All Courier high speed modems-HST, V.32 bis and Dual Stan-
dard-connect at 9600, 12K and 14.4K bps, with 16.SK the
maximum rate on HST-to-HST connections. In addition, our
high-speed modems monitor phone line quality and perform
Adaptive Speed Leveling.
Like
most high speed modems, Courier modems fall back to the
next lower speed, for example, 12K, then 9600, if poor line
conditions warrant. Unlike other modems, however, that stay at
the lower rate for the rest of the call, Courier modems detect
improved line conditions and shift upward again to the next
higher speed. ASL keeps the modems online, always operating
at the highest possible speed, and constantly ensuring data
integrity.
Fax Capability-Courier Fax Modems
If you've chosen to purchase a Courier modem with fax capabil-
ities,
you can use your modem in Class 1 facsimile mode for
sending or receiving faxes.
Error Control-V.42/MNP
Data integrity is ensured when the modems connect with remote
modems that use the V.42 (LAPM), USR-HST, or MNP error
control protocols. Error control is available on calls at 1200 bps
and above.
Features and Compatibility 1-1

COURIER HIGH SPEED MODEMS
Data Compression-V.42 bis/MNP5
Data compression enables potential throughput of well over
SOK bps on 14.4K or 16.8K 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. Achievable
throughput of text and other types of
files is listed
in Appendix A.
Flow ControlNariable Interface Rates
Flow control, required under error control, also allows the local
computer interface rate to be set higher than the link rate,
enabling greater efficiency and throughput. If your equipment
and software support high rates, data can be sent from the com-
puter to the modem at 57.6K, 38.4K or 19.2K bps, regardless of
the link rate.
Voice/Data Switch
Users have always been able to phone and make arrangements
with another user before turning control of the call over to the
modems. A new feature, a switch on the modem's front panel,
allows you to change from voice to data and back again, without
issuing a command.
If you don't ordinarily use voice and data in the same call, you
can assign the switch a different function that normally requires
a command, such as resetting the modem or executing a stored
command string. See Appendix E, Voice/Data, for instructions on
voice/ data switching.
Stored Command String
You can store a command string in nonvolatile random access
memory that is executable at a touch of the voice/ data switch.
Asynchronous/Synchronous Capability
Courier high speed modems operate synchronously as well as
asynchronously. A personal computer equipped with a synchro-
nous interface adapter can call computers that use standard
synchronous protocols. See Chapter 7 for more information.
1-2 Features and Compatibility
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COURIER HIGH SPEED MODEMS
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, it operates at the settings you've
specified.
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.
Modem Diagnostics
New CCITT V.54 loopback testing with the &T command
options, and earlier Courier Register 516 test options are
available. The modem performs three loopback tests: analog,
digital,
and remote digital. See Appendix F 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.
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.
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.
Modem Settings Displays
On command, the modem displays its current settings, a handy
way to check your transmission rate, S-Registers and other oper-
ational controls. The modem also displays the defaults stored in
Features and Compatibility 1-3

COURIER HIGH SPEED MODEMS
nonvolatile memory and the factory defaults stored permanently
in read-only memory.
HELP Screens
The modem displays screens that summarize the command sets,
Dial command options, and S-register functions.
Bottom Panel Reference
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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 LastDialed 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. -
Automated Redialing
You can put the modem into Repeat Mode to continuously redial
if a previous dial attempt fails to connect. This is especially use-
ful in dialing services whose lines are often busy.
Quote Mode
Set the modem to Quote Mode if you want it to dial an alpha-
betic acronym instead of a numeric number.
COMPATIBILITY
The Courier adheres to the following standards, ensuring com-
patibility with a wide base of installed modems. Unless other-
wise indicated, HST, V.32 bis and Dual Standard modems all
conform to the listed standard.
USR-HST 16.SK, 14.4K/12K/9600/7200/4800 bps (Dual
Standard and HST modems)
CCITT V.32 bis 14.4K/12K/9600/7200/4800 bps (Dual
Standard and V.32 bis modems)
CCITT V.32 9600/ 4800 bps (Dual Standard and V.32 bis
modems)
CCITT V.22 bis 2400 bps
1-4 Features and Compatibility
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Bell 212A
CCITTV.23
CCITTV.25
Bell 103
CCITT V.42
COURIER HIGH SPEED MODEMS
1200 bps (also CCITT V.22)
1200 bps with 75 bps back channel (British
phone system)
Answer sequence for calls originating outside
the U.S. and Canada
300 bps (CCITT V .21 optional)
LAPM error control, 1200 bps and higher
CCITT V.42 bis Data compression, 1200 bps and higher
MNP Levels 2, 3 and 4 error control, level 5 data
compression, 1200 bps and higher
CCITT V.54 Analog, digital and remote digital loopback
testing
Fax Modems
TIA/EIA-578 Service Class 1 Asynchronous Facsimile DCE
Control Standard
CCITT V .29 9600I 7200 bps
CCITT V.27 ter 4800/2400 bps
CCITT V.21 300 bps
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.
• Connects in synchronous mode at standard rates with
any system using a synchronous protocol compatible
with your synchronous interface equipment.
• Is fully FCC- and DOC-certified for the uses described in
this manual.
Features and Compatibility 1-5