Multi-Tech Systems MT5634ZBAV.90, MT5634ZBA-VV.90, MT5634ZBAV.92 User Manual

MultiModemZBA

Global MT5634ZBA-Series

MT5634ZBA–V.90

MT5634ZBA-V–V.90

MT5634ZBA–V.92

MT5634ZBA-V–V.92

User Guide

MultiModemZBA Global MT5634ZBA-Series User Guide

MT5634ZBA–V.90, MT5634ZBA-V–V.90, MT5634ZBA–V.92, MT5634ZBA-V–V.92

PN S000286A, Version A

Multi-Tech Systems, Inc. makes no representations or warranties with respect to the contents hereof and specifically disclaims any implied warranties of merchantability or fitness for any particular purpose. Furthermore, Multi-Tech Systems, Inc. reserves the right to revise this publication and to make changes from time to time in the content hereof without obligation of Multi-Tech Systems, Inc. to notify any person or organization of such revisions or changes.

Revisions

Revision Level Date Description

A 02/12/03 Initial release.

Trademarks

MultiModemZBA, Multi-Tech, and the Multi-Tech logo are trademarks of Multi-Tech Systems, Inc. Microsoft, Windows, Windows 95, Windows NT, and Windows 2000 are registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries.

Patents

This device covered by one or more of the following patents: 6,031,867; 6,012,113; 6,009,082; 5,905,794; 5,864,560; 5,815,567; 5,815,503; 5,812,534; 5,809,068; 5,790,532; 5,764,628; 5,764,627; 5,754,589; 5,724,356; 5,673,268; 5,673,257; 5,644,594; 5,628,030; 5,619,508; 5,617,423; 5,600,649; 5,592,586; 5,577,041; 5,574,725; 5,559,793; 5,546,448; 5,546,395; 5,535,204; 5,500,859; 5,471,470; 5,463,616; 5,453,986; 5,452,289; 5,450,425; D353, 598; 5,355,365; 5,309,562; 5,301,274 Other Patents Pending

World Headquarters

Multi-Tech Systems, Inc. 2205 Woodale Drive Mounds View, Minnesota 55112 Phone: 763-785-3500 or 800-328-9717 Fax: 763-785-9874

Technical Support Country By Email By Phone

France: support@multitech.fr (33) 1-64 61 09 81 India: support@multitechindia.com 91 (124) 6340778 U.K.: support@multitech.co.uk (44) 118 959 7774 U.S. and Canada: support@multitech.com (800) 972-2439 Rest of the World: support@multitech.com (763) 717-5863

Internet Address: http://www.multitech.com

Table of Contents

Chapter 1 - Introduction................................................................................................................................5

The Products ............................................................................................................................................5

The Features ............................................................................................................................................5

Features Table..........................................................................................................................................6

What Is in Your Modem Package.............................................................................................................7

Chapter 2 - Installation..................................................................................................................................8

Safety Warnings .......................................................................................................................................8

Step 1: Mount the Feet .............................................................................................................................8

Step 2: Change the Internal Jumpers.......................................................................................................8

Step 3: Connect the Modem to Your PC ................................................................................................10

Step 4: Install the Modem Driver ............................................................................................................12

Step 5: Configure the Modem for Your Country .....................................................................................13

Step 6: Install Data Communications Software ......................................................................................14

Step 7: Modem-on-Hold .........................................................................................................................14

Chapter 3 - Operation..................................................................................................................................15

About the Front Panel.............................................................................................................................15

PhoneTools Features .............................................................................................................................16

Leased-Line Operation ...........................................................................................................................16

V.92 Operation .......................................................................................................................................16

Connecting to the Internet ......................................................................................................................17

Chapter 4 - AT Commands, S-Registers, and Result Codes ..................................................................18

Chapter 5 - Remote Configuration.............................................................................................................19

Basic Procedure .....................................................................................................................................19

Setup ......................................................................................................................................................19

Chapter 6 - Callback Security.....................................................................................................................20

Changing the Setup Password...............................................................................................................20

Turning Callback Security On and Off....................................................................................................20

Setting Callback Security Message Parity..............................................................................................21

Assigning Callback Passwords and Phone Numbers ............................................................................21

Calling Procedures .................................................................................................................................22

Callback Assignments Form...................................................................................................................24

Chapter 7 - Troubleshooting ......................................................................................................................25

None of the Indicators Light....................................................................................................................25

The Modem Does Not Respond to Commands .....................................................................................25

The Modem Cannot Connect When Dialing...........................................................................................26

The Modem Disconnects While Online ..................................................................................................28

Modem Cannot Connect When Answering ............................................................................................29

File Transfer Is Slower Than It Should Be..............................................................................................29

Data Is Being Lost ..................................................................................................................................29

There Are Garbage Characters on the Monitor......................................................................................29

The Modem Doesn’t Work with Caller ID ...............................................................................................30

Fax and Data Software Can’t Run at the Same Time ............................................................................30

Appendix A - Technical Specifications .....................................................................................................31

Appendix B - Upgrading the Modem’s Firmware .....................................................................................33

Upgrade Overview..................................................................................................................................33

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Table of Contents

Appendix C - Regulatory Compliance.......................................................................................................35

FCC Part 15 Regulation .........................................................................................................................35

FCC Part 68 Telecom.............................................................................................................................36

Fax Branding Statement.........................................................................................................................37

Canadian Limitations Notice...................................................................................................................37

International Modem Restrictions...........................................................................................................38

EMC, Safety and R&TTE Directive Compliance ....................................................................................38

New Zealand Telecom Warning Notice..................................................................................................39

South African Statement.........................................................................................................................39

Appendix D - Installing a Modem Under Linux.........................................................................................40

Appendix E - Connecting to a Cisco Router.............................................................................................41

Appendix F - Warranty, Service, and Technical Support........................................................................43

Technical Support...................................................................................................................................46

Internet Sites...........................................................................................................................................46

Index .............................................................................................................................................................47

Multi-Tech Systems, Inc. MT5634ZBA-Series User Guide 4

Chapter 1 - Introduction

Congratulations on your purchase of the MultiModemZBA modem. You have acquired one of the finest intelligent voice/data/fax modems available today from one of the world’s oldest modem manufacturers: Multi-Tech Systems, Inc. This user guide will help you to install, configure, test and use your modem.

The Products

MT5634ZBA-V.90 MT5634ZBA-V-V.90 MT5634ZBA-V92 MT5634ZBA-V-V92

A desktop global data/fax modem supporting the V.90 protocol. A desktop global data/fax/voice modem supporting the V.90 protocol. A desktop global data/fax modem supporting the V.92 protocol. A desktop data/fax/voice modem supporting the V.92 protocol.

The Features

· Global Approval – With an MT5634ZBA global product, you need just one modem for worldwide

use. The MT5634ZBA has approvals in 40+ countries. This means one global product can ship virtually anywhere.

· Voice – (With Voice Models) The voice feature supports voice mail and a full-duplex speakerphone.

This allows you and the caller to speak and listen at the same time.

· Remote Configuration – Whether you provide connectivity for a sales office just miles away or for

multiple offices across the world, the MultiModemZBA lets you configure each remote modem from a central site. See Chapter 5 for a complete discussion.

· Callback Security – Callback security protects your network from unauthorized access. It also helps

control long-distance charges for remote offices and users requiring access to the central site LAN. When callback security is enabled, the remote callers enter a password, and then the central site’s modem calls back. See Chapter 6 for a complete discussion.

· Modem-on-Hold – Modem-on-Hold works with your telephone company’s Call Waiting service to put

a remote modem “on hold” while you answer a voice call. When you finish your conversation and hang up, the previous connection resumes, providing you have not exceeded the time limit. Among other things, this feature eliminates the problem of the modem disconnecting if someone calls you while Call Waiting is enabled.

· 2-Wire Leased-Line Support – A leased line is a private, permanent, telephone connection

between two points. Unlike normal dialup connections, a leased line is always active. The modems automatically connect when they are attached to the line and are turned on. Because a leased line is always active, one of the two modems on the line must be configured as the originate modem and the other as the answer modem. It does not matter which is which. In the event of an interruption, leased-line modems automatically reconnect when the data line or power is restored.

Multi-Tech Systems, Inc. MT5634ZBA-Series User Guide 5

Chapter 1 - Introduction

Features Table

FEATURES

MT5634

ZBA V.90

V.90/56K Max. Data Speed xx V.92/56K Max. Data Speed xx Modem-on-Hold (V.92 Feature) xx Global Approval in Many Countries for Worldwide Use xxxx Voice Support xx Callback Security xxxx 2-Wire Leased-Line Support xxxx DTMF Tone Detection xxxx Phone Number Storage for Automatic or DTR Dialing xxxx Common Features:

· V.90 or V.92 Related Features (see below)

· Remote Configuration

· Error Correction

· Caller ID (U.S. Only)

· Multi-Language Data/Fax Software for Windows

· Windows Plug and Play Operation

· Flash Memory for Easy Updates

· Self-Resetting Lightning Protection

· Ten Year Warranty

xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx

PRODUCTS

MT5634

ZBA-V

V.90

MT5634

ZBA V.92

MT5634

ZBA-V

V.92

Features Specific to V.90

· Speed – V.90/56K download speeds from V.90 servers and 33.6K upload speeds.

· Fax – Class 1 and 2 faxing at 14.4K.

· Compression – V.42 compression.

Features Specific to V.92

· Speed – V.92/56K download speeds and 48K upload speeds when connecting with V.92 server.

· Fax – Class 1, 1.0, 2, and 2.1 faxing at speeds to V.34/33.6K bps (Super G3).

· Compression – V.44 compression improves data throughput rates.

· Quick Connect – Quick connect can cut the time required for a dial-up modem to “handshake”

to an ISP or other connection in half.

· Modem-on-Hold – Modem-on-Hold allows the modem to work in conjunction with call waiting

provided by the phone company.

Please note that some V.92 features are turned off in the factory default configuration, and may need to be turned on, depending on your needs.

Multi-Tech Systems, Inc. MT5634ZBA-Series User Guide 6

Chapter 1 - Introduction

What Is in Your Modem Package

· An MT5634ZBA-Series modem

· A set of four self-adhesive plastic feet

· This Quick Start Guide

· A system CD containing modem drivers, a User Guide, an AT Command Reference Guide,

PhoneTools (a data communications program), and Acrobat Reader.

· A universal power supply

· A 9-pin to 25-pin serial cable

· An RJ-11 phone cable

· A power cord (country-specific)

Multi-Tech Systems, Inc. MT5634ZBA-Series User Guide 7

Chapter 2 - Installation

This chapter shows you step-by-step how to set up your Multi-Tech MT5634ZBA modem.

Safety Warnings

· Use this product only with UL- and CUL-listed computers (U.S.A. and Canada)

· To reduce the risk of fire, use only 26 AWG (.41mm) or larger telephone wiring.

· Never install telephone wiring during a lightning storm.

· Never install a telephone jack in a wet location unless the jack is specifically designed for wet

locations.

· Never touch uninsulated telephone wires or terminals unless the telephone line has been

disconnected at the network interface.

· Use caution when installing or modifying telephone lines.

· Avoid using a telephone during an electrical storm; there is a risk of electrical shock from lightning.

· Do not use a telephone in the vicinity of a gas leak.

Step 1: Mount the Feet

The modem comes with a set of self-adhesive plastic feet, which you can optionally mount on the modem. To install the feet, simply peel them from their paper strip and press them into the recesses on the bottom of the modem.

Step 2: Change the Internal Jumpers

This step is required only if:

· You intend to use the modem on a leased line.

· You intend to add a monophonic external speaker to your modem with the voice option. No changes

are needed for stereo.

This will require you to open the modem and move one or more jumpers on the modem’s printed circuit board.

Warning: The following procedure must be performed by authorized service personnel. Caution: The circuit board can be harmed by static electricity. Before you open the case, touch a grounded

object, such as the metal chassis of your computer, to discharge any static electricity in your body, then touch the metal shell of the modem’s RS-232 connector to ensure that there is no voltage difference between you and the modem.

Opening the Modem

1. If the modem is connected, turn it off and remove all connecting cables (including the power and line cables).

2. Turn the modem upside down.

3. On the bottom of the modem are two screws, which hold the case together. Remove both screws and set them aside.

4. Turn the modem right side up.

5. Remove the top part of the modem case.

6. To close the modem, reverse Steps 1–5.

Multi-Tech Systems, Inc. MT5634ZBA-Series User Guide 8

Chapter 2 - Installation

Location of the Jumpers

Jumper for Modem with Voice Option

Changing the Dial-Up/Leased-Line Jumper

As shipped from the factory, your modem is configured for normal dial-up operation. That is, the modem must dial a phone number to connect to another modem. To use the modem on a leased line, you must change jumper J10 to select leased line operation, and J11 to select whether it will be the originating or the answering modem. If dial-up operation is selected, J11 has no effect. See Chapter 3 for additional leased line information.

· The factory default is the answer position. This makes the modem the answering modem

on the leased line.

· To use the modem on a leased line, move the J10 jumper plug from the default dial-up position to the

leased line position.

· To make the modem the originating modem on the leased line, move the J11 jumper plug to the

originate position.

Changing the Voice Jumper

The speaker jumper (J8) is next to the external speaker jack.

· The factory default position of the voice jumper is set for a stereo speaker or sound card. A

jumper plug covers both pins of the J8 jumper.

· To use the modem with a monophonic external speaker, remove the jumper plug from the J8

jumper pins. You can store it by placing it on one jumper pin.

Multi-Tech Systems, Inc. MT5634ZBA-Series User Guide 9

Chapter 2 - Installation

Step 3: Connect the Modem to Your PC

Turn off your computer. Place the modem in a convenient location, and then connect it to your computer’s serial port, the telephone line or leased line, AC power, and, optionally, your telephone.

Connections - No Voice

Connections With Voice

Connect the Modem to Your PC

Plug one end of the serial cable into the RS232 connector on the modem and the other end into a serial port connector on your computer, such as COM1 or COM2.

Connect the Modem to the Telephone Line

Plug one end of the modular telephone cable into the modem’s LINE jack and the other end into a standard phone wall jack.

Important: The LINE jack is not interchangeable with the PHONE jack. Do not plug the telephone into the LINE jack or the line cable into the PHONE jack.

Note: Regulatory agencies may impose certain restrictions on equipment connected to public telephone systems. For more information, see Appendix A.

Connect the Two-Wire Leased Line (Leased Line Only)

Plug one end of a two-wire telephone cable into the modem’s LINE jack and the other end to a two-wire leased line wall jack or terminals.

Note: Before you can use the modem on a leased line, you must first change the internal jumpers.

See “Step 2: Change the Internal Jumpers.”

Connect the Modem to a Phone (Optional)

If you want to connect a phone to same line as the modem, plug it into the modem’s PHONE jack.

Important: The PHONE jack is not interchangeable with the LINE jack. Do not plug the telephone into the LINE jack or the line cable into the PHONE jack.

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Chapter 2 - Installation

Connect a Microphone (Voice Option)

For voice mail or speakerphone applications, plug an unamplified microphone into the MIC jack on the side of the modem. The microphone should have a stereo 1/8-inch mini plug. Do not use a monophonic microphone.

Connect Speakers (Voice Option)

For speakerphone or voice mail applications, use a 1/8-inch plug male-to-male stereo patch cord to connect the SPKR jack on the side of the modem to the LINE IN jack on your sound card. If your sound card does not have a LINE IN jack, use its MIC jack. The stereo male-to-male patch cord can be purchased at a local PC retail store.

If you do not have a sound card, you can plug an unamplified speaker directly into the SPKR jack.

Connect the Modem to the AC Power Outlet

The power switch is located on the right side of the modem. Make sure it is set to OFF. Plug the universal power supply into the PWR jack on the modem. Then plug one end of the countryspecific power supply cord into the universal power supply and the other end into a power outlet or power strip.

Note: Use only the power supply supplied with the modem. Use of any other power supply voids

the warranty and can damage the modem.

Power-On Test

Test the modem by turning it on. When you turn it on, the modem performs a diagnostic self-test, after which the 56 indicator should light. If this does not happen, check that the power switch is on, the power supply is solidly connected, and the AC outlet is live. If these measures do not work, see Chapter 7, “Troubleshooting.”

Surge Protectors and Lightning

Your modem has automatic, self-resetting protection to protect it from lightning-induced electrical spikes on the telephone line. Nonetheless, large power surges and nearby lightning strikes can damage or destroy your modem. Therefore, we recommend that you plug the modem into a surge protector rather than directly into a wall outlet, preferably a surge protector that provides protection against electrical spikes on the telephone line as well as on the power line. Note that not even a surge protector can guard against damage from a nearby lightning strike. During an electrical storm, it is safest to unplug your computer equipment from both the power outlet and the telephone line.

Multi-Tech Systems, Inc. MT5634ZBA-Series User Guide 11

Chapter 2 - Installation

Step 4: Install the Modem Driver

If you use Windows 95 or above, you must install the modem driver. The modem driver tells Windows how to control the modem. If you use a Linux operating system, please see Appendix D. If you use another operating system, please refer to its documentation for modem installation information.

Installing the Modem Driver

1. Make sure your modem is connected properly, and then turn on your computer. Windows

should detect your new modem and open the Install New Modem wizard.

Note: If Windows cannot find a modem, your modem may be turned off, it may be plugged into

the wrong connector on your computer, or the serial cable may be faulty. See “None of the LEDs Light When the Modem Is Turned On” and “The Modem Does Not Respond to Commands” in Chapter 7, “Troubleshooting.”

Insert the system CD into your CD-ROM drive, and then click OK.

Windows installs the modem driver.

4. Click Finish to exit.

For Windows NT, the Install New Modem wizard presents one additional prompt before Step 2. At

this prompt, select Don’t detect my modem; I will select it from a list. Then click Next. A dialog box with a list of manufacturers and a list of modem models appears. Select your modem.

Continue with Step 2 above.

Removing an Old Modem Driver

When a new modem replaces another modem, the old modem driver remains in Windows, and the old modem driver is still selected in Windows applications. Though you can change the application connection descriptions one at a time, it is easier to force Windows applications to use the new modem by removing the old modem driver from Windows.

Click the Start button, point to Settings, and click Control Panel.

Double-click the Modems icon to open the Modems Properties dialog box.

In the list box, select the old modem.

Click Remove, and then click Close.

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Chapter 2 - Installation

Step 5: Configure the Modem for Your Country

Different countries have different requirements for how modems must function. Therefore, before you use your modem, you must configure it to match the defaults of the country in which you are using it. You must also do this if you move the modem to another country after it has been configured for the first country. You can use one of two configuration methods:

Use the Global Wizard to Configure Your Modem

Use AT Commands to Configure Your Modem

Using the Global Wizard to Configure Your Modem

The Glo bal Wizard configuration utility is recommended for computers runn ing Windows 95 or newer.

Insert the MultiModemZBA system CD into the CD-ROM drive. The Autorun menu should

appear.

Click Initial Setup and Country Selection.

Choose either:

Run Global Wizard from CD. This will not load the wizard onto your hard drive, or Install Global Wizard on the HD. This will install the wizard onto your hard drive for future use.

The Global Wizard dialog box appeared. Click Next.

The Global Wizard searches for your modem and identifies it. Click Next.

Select the country in which the modem will be used. Click Next.

Review your choice of country. If it is correct, click Next to configure the modem.

When Global Wizard announces that the parameters have been set, click Finish to exit.

Using AT Commands to Configure Your Modem

Non-Windows users can configure the modem using AT commands. You must enter these commands in your communication program’s terminal window.

Run Phone Tools.

To configure the modem for a specific country:

Type AT%T19,0,nn, where nn is the country code in hexadecimal notation. Click E

Then save the code by typing the following command: AT&F&W.

Click E

To verify that the correct country has been configured, type:

ATI9 and click ENTER. The country code displays:

Country AT Command (hexadecimal) Result code (decimal)

Euro/NAM AT%T19,0,34 (default) 52

A list of country codes can be found on the Multi-Tech Web site at

http://www.multitech.com/GlobalModem/config.

NTER. The message OK displays.

Multi-Tech Systems, Inc. MT5634ZBA-Series User Guide 13

Chapter 2 - Installation

Step 6: Install Data Communications Software

Data communications software is designed to configure a modem so it can send and receive messages. Your Multi-Tech modem operates under the control of a data communications program, such as Phone Tools, included with the modem. The modem can also operate under other general-purpose data communication programs, such as Windows HyperTerminal. To install Phone Tools, insert the MT5634ZBA system CD into the CD-ROM drive; click the Phone Tools icon. You will be asked to choose your language. The software automatically loads onto your PC. To configure your modem, follow these steps:

After installing Phone Tools, run the program.

Find the dialog box or menu that lets you select your modem. (In Windows Terminal select

Choose your modem from the program’s modem list. If it isn’t listed, choose a generic modem and

modify the settings as necessary.

Change the modem initialization string, if necessary. The factory default configuration works well

for most purposes. To load the factory default configuration, use AT&F. To load a custom configuration that was saved using the &W command, use ATZ. For a Macintosh, the initialization string should include the &D0 command. If you do not want the modem to always answer the phone, add S0=0 to the string. To use Caller ID with the modem, add S0=2 to the string (Caller ID information is sent between the first and second rings, so the phone must ring at least twice before the modem picks up the line). Depending on the software, you might have to end the string with a carriage return character (^M).

Note: To change the modem’s default configuration, type new commands in the communication

program’s terminal window, adding the &W command to store them in the modem’s nonvolatile memory. For instance, to create a default configuration that turns off autoanswer, type AT&FS0=0&W. The new configuration loads automatically whenever the modem is turned on or receives the ATZ command.

Select the port the modem is connected to (normally COM1 or COM2). Select your serial port speed. This can be labeled “maximum speed,” “DTE bps,” or “baud rate.”

Ideally, if you use data compression, you should set your serial port baud rate to four times the modem’s maximum transmission speed or faster; however, few files can be compressed enough to require speeds that high, and not all serial ports can handle speeds that high.

If the communication program has an autobaud selection, make sure it is disabled. Autobaud

applies only to older modems, and can cause problems if enabled.

If the program allows you to edit the no-connect messages (NO CARRIER, BUSY, NO ANSWER,

NO DIALTONE), make sure there is no space between DIAL and TONE in NO DIALTONE.

For more information, refer to the software manuals or the software’s online help for other

configuration choices and for information on how to use the modem with other communication programs. In most cases you can accept the default values.

Step 7: Modem-on-Hold

This step applies to modems used in North America and V.92 modems only.

Modem-on-Hold is a feature that allows you to manage all your telephone communications while connected to the Internet over a single telephone line. Load it onto your PC from the system CD.

Important:

1. The modem driver must be installed before you install Modem-on-Hold.

2. Your ISP must support the Modem-on-Hold feature.

3. Your modem must be support V.92.

4. Your phone line must support call waiting. For information about setting up and using Modem-on-Hold, refer to the Modem-on-Hold ReadMe file. You

can also use the program’s online Help accessed by pressing F1 or the Help button; you can also rightmouse click on a menu item.

Multi-Tech Systems, Inc. MT5634ZBA-Series User Guide 14

Chapter 3 - Operation

About the Front Panel

The MultiModem V.92 Front Panel

The MultiModem V.90 Front Panel

The MultiModemZBA LED indicators on the front panel indicate status, configuration, and activity:

TD – Transmit Data. Flashes when the modem is transmitting data to another modem. RD – Receive Data. Flashes when the modem is receiving data. CD – Carrier Detect. Lights when the modem detects a valid carrier signal from another modem. It is on

when the modem is communicating with the other modem, and off when the link is broken.

56 – 56K Mode (56,000–28,000 bps). Lights whenever the modem is set for or connects using the V.90 or

V.92 protocol. The actual connection speed depends on ISP server capabilities and line conditions.

33 – V.34 Mode (33,600–16,800 bps). Lights whenever the modem connects using the V.34 protocol. 14 – V.32bis Mode (14,400–12,000 bps). Lights when the modem connects using the V.32bis protocol. The

modem can connect at lower than V.32bis speeds, but no speed indicator lights during the connection.

OH – Off-Hook. Lights when the modem is off-hook, which occurs when the modem is dialing, online, or

answering a call. Flashes when the modem pulse-dials.

TR – Terminal Ready. Lights when a communications program is using the modem. It means the modem is

ready for an outgoing or incoming call. It goes off when the communications program disconnects the serial port. When it goes off, a connected modem will also disconnect.

EC – Error Correction (V.42). Lights continuously when the modem is in V.42 error correction mode, and

flashes when compression is activated.

FX – Fax. Lights when the modem is in fax mode. Note: When you turn on the modem, the protocol indicators flash briefly as the modem does a self-test, after

which the 56 indicator lights. After a call, the indicator for the protocol used in the connection remains lit until another call is made or the modem is reset. If you connect at a rate under 14,400 bps, all protocol indicators remain off after the connection is broken, even though the modem is still turned on.

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