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Multitech MultiModem MT4X56USB User Manual

For v.90 modems
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Summary of Contents for Multitech MultiModem MT4X56USB

  • Page 1 MultiModemUSB Model MT4X56USB User Guide...
  • Page 2 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.

  • Page 3: Table Of Contents

    Loading your Driver Software ... 16 MT4X56USB Drivers for Windows 98 ... 16 MT4X56USB Drivers for Windows 95 ... 19 MT4X56USB Drivers for Windows NT 4.0 ... 21 MT4X56USB Drivers for Windows 2000 ... 23 Installing Your V.90 Modems ... 27 Installing Your V.90 Modems (Windows 2000) ...
  • Page 4 Chapter 7 - Upgrade Procedure Introduction ... 66 Upgrade Overview ... 66 Step 1: Identify the MT4X56USB Firmware ... 66 Step 2: Identify the Current Firmware Version ... 66 Step 3: Download the Upgrade File ... 67 Step 4: Extract the Upgrade Files ... 67 Step 5: Clear Your Stored Paramenters ...

  • Page 5: Chapter 1 - Introduction And Description

    Chapter 1 - Introduction and Description...

  • Page 6: Introduction

    Internet access, and double or even triple bandwidth by using more than one modem simultaneously with Multi-Link PPP bonding. The MT4X56USB includes a complete set of Internet business applications. The four dual-mode 56 Kbps modems support the new ITU V.90 standard and offer backward compatibility with K56flex.

  • Page 7: Technical Specifications

    • Relative humidity: 0 to 95% non-condensing Preview of this Guide This guide describes the MT4X56USB and explains how to install and configure the unit. The information contained in each chapter is as follows: Chapter 1 - Introduction and Description This chapter describes the MT4X56USB including features, technical specifications and a description of the front panel indicators and back panel connectors.

  • Page 8: Related Documentation

    Copies of the following guides are provided on the Manuals disk that ships with each MT4X56USB, and you can always find the latest version of these guides at Multi-Tech’s Web site.

  • Page 9: Front Panel

    Note: If the MT4X56USB is powered on but the USB cable is not attached, the Hub LED will be Off. When the USB cable is attached, the LED turns Green.

  • Page 10: Back Panel

    MultiModemUSB User Guide Back Panel The cable connections for the MT4X56USB are made at the back panel. Three groups of cables are used; four ports for RJ-11 modem connections, two types of USB connections, and a power connection. The cable connections are shown in Figure 1-3 and defined in the following groups.

  • Page 11: Chapter 2 - Installation

    Chapter 2 - Installation...

  • Page 12: Unpacking

    MT4X56USB User Guide). Inspect the contents for signs of any shipping damage. If damage is observed, do not power up the unit; contact Multi-Tech’s Technical Support for advice (refer to Chapter 8). If no damage is observed, place the MT4X56USB in its final location and perform the cabling procedure.

  • Page 13: Cabling Your Mt4X56Usb

    AC outlet. 2. Connect one end of the RJ-11 cable to Port 1 on the back of the MT4X56USB. Connect the other end to the line jack which provides access to the public phone system.
  • Page 14 MultiModemUSB User Guide MT4X56USB...

  • Page 15: Chapter 3 - Software Loading And Configuration

    Chapter 3 - Software Loading and Configuration...

  • Page 16: Introduction

    If you are using Windows 98, which fully supports USB, proceed to “Loading Your Driver Software.” If you are using Windows NT, proceed to “MT4X56USB Drivers for Windows NT” and if you are using Windows 2000, proceed to “MT4X56USB Drivers for Windows 2000”. If you are using Windows 95 OSR2.1 or above, please do the following to determine if your system supports USB:...
  • Page 17 Click (check) the box next to “Floppy disk drives” and then click Next >. 8. Windows locates the driver files on the disk and displays the Add New Hardware Wizard dialog box. Click Next >. MT4X56USB Chapter 3 - Software Loading and Configuration...
  • Page 18 Uninstalling MultiModemUSB in Windows 98 1. Double-click the edgeport.exe file in your Windows System directory. The MultiModem Properties dialog box is displayed. 2. Select the Advanced tab. 3. Click the Uninstall button. The drivers will be removed from your computer. MT4X56USB...

  • Page 19: Mt4X56Usb Drivers For Windows 95

    2. Ensure that the appropriate USB cable connection has been made to the periperal (Refer to the “Cabling Your MT4X56USB” section). 3. Connect the “D-shaped” end to the USB-B port on the back of the MT4X56USB now. 4. Windows detects the MT4X56USB and displays the Update Device Driver Wizard dialog box.
  • Page 20 MultiModemUSB User Guide 6. The Insert Disk dialog box is displayed. Insert MT4X56USB Driver Disk 1 into drive A and click OK. 7. The Copying Files… dialog box is displayed. Type A: in the “Copy files from” field and click OK. The driver files will be copied to your system.

  • Page 21: Mt4X56Usb Drivers For Windows Nt 4.0

    Note: “Plug-and-Play” operations are not supported in an NT 4.0 (or earlier) operating system. 1. Ensure that power to the MT4X56USB is on but that the USB cable remains disconnected. 2. Insert the MT4X56USB Disk 2 into drive A.
  • Page 22 9. After the program files have been copied to your hard drive, the Information dialog box is displayed indicating that the drivers have been successfully installed. Connect the USB cable to the MT4X56USB and click OK. 10. Remove the disk from the floppy drive.

  • Page 23: Mt4X56Usb Drivers For Windows 2000

    2. Ensure that the appropriate USB cable connection has been made to the peripheral (refer to the “Cabling Your MT4X56USB” section) and that the MT4X56USB is powered on. 3. Connect the D-shaped end of the USB cable to the USB-B port on the back of the MT4X56USB now.
  • Page 24 9. The driver files are copied to your Windows System directory. 10. Once the files have been copied to your PC, the Found New Hardware Wizard dialog box is displayed and indicates that Windows has completed installing the software for your MT4X56USB V.90 Fax/Modem. Click Finish. MT4X56USB...
  • Page 25 Ensure that the default “Search for the best driver for your device (recommended)” is selected, then click Next >. 13. The Found New Hardware Wizard dialog box is displayed with the message “Locate Driver Files.” Click the box for “Floppy disk drives” and click Next >. MT4X56USB Chapter 3 - Software Loading and Configuration...
  • Page 26 3. Follow the on-line instructions until the Devices window is displayed. Select the appropriate entries to be deleted and click Next >. 4. The Uninstall Device dialog box is diplayed asking you if you are sure that you want to uninstall this device. Click Yes and then Next >. MT4X56USB...

  • Page 27: Installing Your V.90 Modems

    1. Click Start | Settings | Control Panel | Modems. 2. The Modems Properties dialog box is displayed. Note: Windows 95/98 provides a Diagnostics tab option. From the General tab, click the Add button. MT4X56USB Chapter 3 - Software Loading and Configuration...
  • Page 28 (the check box is checked) and click Next >. Continue with step 4. 4. For Windows NT installations, the Install New Modem dialog box is displayed - Manufacturer and Model options. Select MultiTech Systems and MultiModem MT4X56USB, then click Next >. MT4X56USB...
  • Page 29 Click Next > for each of the four modems. Note: For first time installation, the application may display a Location Information dialog box. Fill out the necessary phone information and click Next >. MT4X56USB Chapter 3 - Software Loading and Configuration...
  • Page 30 9. The Modems Properties dialog box is displayed and lists the modems that are set up on the computer. Click Close to exit the program. Note for Windows NT 4.0: Once you have clicked Close, NT requires that you update Dial-up networking (RAS). Click Yes and follow the online instructions. MT4X56USB...

  • Page 31: Installing Your V.90 Modems (Windows 2000)

    3. The Phone and Modem Options dialog box is displayed. Click on the Modems tab. Click Add. 4. The Add/Remove Hardware Wizard dialog box is displayed. Check (click) the “Don’t detect my modem; I will select it from a list.” option and then click Next >. MT4X56USB Chapter 3 - Software Loading and Configuration...
  • Page 32 Insert Driver Disk 3 into drive A and click Have Disk. 6. The Add/Remove Hardware Wizard dialog box is displayed. Select (highlight) the MultiModem MT4X56USB modem and click Next >. 7. The Add/Remove Hardware Wizard dialog box is displayed. Select (highlight) the COM ports you installed and click Next >.
  • Page 33 9. The Found New hardware Wizard dialog box is displayed. Click Finish. 10. The Phone and Modems Options dialog box is displayed. Check to make certain that all four modems have been installed and then click OK. MT4X56USB Chapter 3 - Software Loading and Configuration...

  • Page 34: Windows 95/98 Configuration Utility

    1. Double-click the edgeport.exe file located in your Windows System directory. 2. The MultiModem Properties dialog box is displayed. While in the General tab, use your cursor to highlight your MT4X56USB and then click the Information or the Configure button.
  • Page 35 3. From the MultiModemUSB USB Properties dialog box, click Version. The Version tab is displayed. The Version tab contains a list of all of the MT4X56USB files, each file's version number, size, date created, and a brief description. 4. From the MultiModemUSB USB Properties dialog box, click Advanced. The Advanced tab is displayed.

  • Page 36: Windows Nt 4.0/2000 Configuration Utility

    1. Click Start | Programs | Multi-Tech USB Utilities | USB Configuration Utility. 2. The MultiModemUSB USB Properties dialog box (General tab) is displayed. While in the General tab, use your cursor to highlight your MT4X56USB and then click the Information or the Configure button.
  • Page 37 3. From the MultiModemUSB USB Properties dialog box, click Version. The Version tab is displayed. The Version tab contains a list of all of the MT4X56USB files, each file's version number, size, date created, and a brief description. 4. To remove the program files, use the Add/Remove program found in the Start menu under Settings | Control Panel.
  • Page 38 MultiModemUSB User Guide MT4X56USB...

  • Page 39: Chapter 4 - At Commands, S-Registers And Result Codes

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

  • Page 40: Introduction

    Description: Answer incoming call immediately. Command: A/ Repeat Last Command Values: Description: Repeat the last command string. Do not precede this command with AT. Do not press E ) key to execute most commands. NTER ETURN to execute. NTER MT4X56USB...
  • Page 41 Disable online data character echo (included for backward compatibility with some software). Command: Hook Control Values: n = 0 or 1 Default: Description: H0 Go on-hook (hang up). Go off-hook (make the phone line busy). MT4X56USB Chapter 4 - AT Commands, S-Registers and Result Codes...
  • Page 42 Set value of register Sr to value of n, where n is entered in decimal format. E.g., S0=1. Command: Read Register Value Values: r = S-register number Default: None Description: Read value of register Sr and display it in 3-digit decimal form. E.g., S2? gives the response 043. MT4X56USB...
  • Page 43 If DTR drops, the modem hangs up and resets as if an ATZ command were issued. Command: &Fn Load Factory Settings Values: n = 0 Default: None Description: &F0 Load factory settings as active configuration. Note: See also the Z command. MT4X56USB Chapter 4 - AT Commands, S-Registers and Result Codes...
  • Page 44 Note: To stop a test, you must use the escape sequence (+++AT) before typing AT&T0. Command: &V Display Current Settings Values: Description: Displays the active modem settings, including the callback security settings if callback security is enabled. If the setup password has been entered, it also displays the callback security passwords. MT4X56USB...
  • Page 45 Data Buffer Control Values: n = 0 Default: Description: \J0 Enable data buffer—serial port speed is independent of connect speed. Disable data buffer—serial port speed is forced to the line speed. MT4X56USB Chapter 4 - AT Commands, S-Registers and Result Codes...
  • Page 46 Sets the time (in minutes) after the last character is sent or received that the modem waits before disconnecting. A value of zero disables the timer. Applies only in buffer mode. Note: You can also set the inactivity timer by changing the value of S30. MT4X56USB...
  • Page 47 MTSMODEM Description: Enters the remote configuration setup password. Command: #S=x Store Setup Password Values: x= password (1–8 characters, case sensitive) Default: MTSMODEM Description: Stores a new remote configuration setup password. MT4X56USB Chapter 4 - AT Commands, S-Registers and Result Codes...
  • Page 48 Type +++AT and up to ten command characters, then press ENTER. Used mostly to issue the hang-up command: +++ATH<CR>. Command: %%%AT<CR>Remote Configuration Escape Sequence Values: Description: Initiates remote configuration mode while online with remote modem. The remote configuration escape character (%) is defined in register S13. MT4X56USB...

  • Page 49: S-Registers

    0–1 decimal 0–7 decimal 0–19 * These values may be different outside North America. MT4X56USB Chapter 4 - AT Commands, S-Registers and Result Codes Default Description Sets the number of rings until the modem answers. ATS0=0 disables autoanswer completely. Counts the rings that have occurred.
  • Page 50 8 = 44,000 bps 9 = 46,000 bps 10 = 48,000 bps 11 = 50,000 bps 12 = 52,000 bps 13 = 54,000 bps 14 = 56,000 bps S48=128 Do not use Async MNP or hangup MNP or async MT4X56USB...

  • Page 51: Result Codes

    CONNECT 42666 CONNECT 45333 CONNECT 46666 CONNECT 49333 CONNECT 50666 CONNECT 53333 CONNECT 54666 MT4X56USB Chapter 4 - AT Commands, S-Registers and Result Codes Description Command executed Modem connected to line Ring signal detected Carrier signal lost or not detected...
  • Page 52 V42bis —V.42 error control (LAP-M) and V.42bis data compression V42 —V.42 error control (LAP-M) only MNP5 —MNP 4 error control and MNP 5 data compression MNP4 —MNP 4 error control only NoEC —No error control protocol). For more information on scripting, click the Help button. MT4X56USB...

  • Page 53: Chapter 5 - Remote Configuration

    Chapter 5 - Remote Configuration...

  • Page 54: Introduction

    Remote configuration is a network management tool that enables you to configure modems anywhere in your network from one location. With password-protected remote configuration, you can issue AT commands to a remote MT4x56USB for maintenance or troubleshooting as if you were on- site.
  • Page 55 3. Save the new value by typing AT&W and pressing ENTER. 4. Type ATO<CR> to exit remote configuration. Remote Configuration Commands These commands, documented in Chapter 4 of this manual, enable you to configure various Remote Configuration parameters: #Sx, #S=x, and %%%AT. MT4X56USB...
  • Page 56 MultiModemUSB User Guide MT4X56USB...

  • Page 57: Chapter 6 - Troubleshooting

    Chapter 6 - Troubleshooting...

  • Page 58: Introduction

    MultiModemUSB User Guide Introduction Your MT4X56USB was thoroughly tested at the factory before it was shipped. If you are unable to make a successful connection with one of the V.90 modem ports, or if you experience data loss or garbled characters during your connection, it is possible that a particular modem is defective.

  • Page 59: The Modem Disconnects While Online

    (e.g., ATDT*70,—note the comma, which inserts a pause before the number is dialed). To change the dial prefix in Windows 98 HyperTerminal, select Call from the Call menu, click Dialing Properties, check This location has Call Waiting, and select the correct code for your phone service. MT4X56USB Chapter 6 - Troubleshooting...

  • Page 60: The Modem Cannot Connect When Answering

    The remote digital loopback test allows you to verify that the remote computer or terminal, the remote modem, the serial ports, the telephone line, and the local modem are functioning properly. Note: All loopback tests operate at all speeds except 300 bps. MT4X56USB...

  • Page 61: Local Analog Loopback Test (V.54 Loop 3)

    Figure 6-1. Local analog loopback test. Test procedure 1. Connect the MT4X56USB to your computer. Using your communication program, set the desired baud rate and go into terminal mode. 2. Type AT&T1 and press ENTER. This places your modem in analog loopback mode in the originate mode.

  • Page 62: Remote Digital Loopback Test (V.54 Loop 2)

    AT&T and press ENTER to exit the test, then type ATO and press ENTER to return on line. If you wish to terminate the call, type ATH and press ENTER to hang up. MT4X56USB...

  • Page 63: Local Digital Loopback Test (V.54 Loop 2)

    AT&T and press ENTER to exit the test, then type ATO and press ENTER to return on line. If you wish to terminate the call, type ATH and press ENTER to hang up. MT4X56USB Chapter 6 - Troubleshooting...

  • Page 64: Windows 95/98 Troubleshooting

    Note: Windows 95 version 4.0.950 or 4.0.950a does not support the upgrade path to USB. Microsoft does not provide an upgrade path to OSR2 from earlier versions of Windows. OSR2 must be preinstalled by your PC vendor. Contact your PC vendor for more information. MT4X56USB...

  • Page 65: Chapter 7 - Upgrade Procedure

    Chapter 7 - Upgrade Procedure...

  • Page 66: Introduction

    LT V.90 1.0 MT4X56USB Serial Data/Fax/Voice modem Version 4.07a Step 2: Identify the Current Firmware Version Identify the current version of the firmware at the Multi-Tech Web site. If your MT4X56USB already has the current firmware, there is no need to update it.

  • Page 67: Step 3: Download The Upgrade File

    5. If the Current Revision number is larger than the firmware version number found in “Step 1: Identify the MT4X56USB Firmware,” your MT4X56USB has an older firmware version. Continue with “Step 3: Download the Upgrade File.” Step 3: Download the Upgrade File Multi-Tech Web Site 1.

  • Page 68: Step 6: Upgrade The Modem's Firmware

    7. If you need more assistance programming FLASHPRO, contact our Technical Support department. Step 7: Restore Your Parameters Your modem is now updated. You can now open your terminal program to reprogram your modem parameters, if necessary, or to confirm the update by typing ATI in the terminal window. MT4X56USB...

  • Page 69: Chapter 8 - Service, Warranty And Tech Support

    Chapter 8 - Service, Warranty and Tech Support...

  • Page 70: Introduction

    The software is furnished to the Licensee for execution and use on a single computer system only and may be copied (with the inclusion of the Multi-Tech Systems, Inc. copyright notice) only for use on that computer system. The Licensee hereby agrees not to provide or otherwise make available any portion of this software in any form to any third party without the prior express written approval of Multi-Tech Systems, Inc.

  • Page 71: Limited Warranty

    MTS WILL NOT BE LIABLE FOR CONSEQUENTIAL DAMAGES AND UNDER NO CIRCUMSTANCES WILL ITS LIABILITY EXCEED THE PURCHASE PRICE FOR DEFECTIVE PRODUCTS. On-line Warranty Registration If you would like to register your MT4X56USB electronically, you can do so at the following address: http://www.multitech.com/register/ Tech Support Multi-Tech has an excellent staff of technical support personnel available to help you get the most out of your Multi-Tech product.

  • Page 72: Contacting Tech Support Via E-Mail

    If you need to inquire about the status of the returned product, be prepared to provide the serial number of the product sent. Send your MT4X56USB to this address: You should also check with the supplier of your MT4X56USB on the availability of loaner units and/or local service in your area. MULTI-TECH SYSTEMS, INC.

  • Page 73: Appendices

    Appendices...

  • Page 74: Appendix A - Regulatory Information

    Industry Canada This Class B digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations. Cet appareil numerique de la classe B respecte toutes les exigences du Reglement sur le material brouilleur du Canada. Class B Statement MT4X56USB...

  • Page 75: Fcc Part 68 Telecom

    7. No repairs are to be made by you. Repairs are to be made only by Multi-Tech Systems or its licensees. Unauthorized repairs void registration and warranty.

  • Page 76: Fax Branding Statement

    This precaution may be particularly important in rural areas. Caution: Users should not attempt to make such connections themselves, but should contact the appropriate electric inspection authority, or electrician, as appropriate. MT4X56USB...

  • Page 77: Emc, Safety And Terminal Directive Compliance

    Some dialing and answering defaults and restrictions may vary for international modems. Changing settings may cause a modem to become non-compliant with national telecom requirements in specific countries. Also note that some software packages may have features or lack restrictions that may cause the modem to become non-compliant. MT4X56USB Appendices...

  • Page 78: Appendix B - V.90 Support

    3. Try limiting the speed with the S37 (sets the maximum upstream speed) and S38 (sets the maximum downstream speed) commands. 4. Perform basic modem/line troubleshooting (check the phone line for noise, try a different line, try another device on the same line, etc.) MT4X56USB...

  • Page 79: Glossary Of Terms

    Glossary of Terms...
  • Page 80 Keyboards, serial ports, muxes and printers are a few examples of the devices that contain buffers. Bus: A common channel between hardware devices either internally between components in a computer, or externally between stations in a communications network. MT4X56USB...
  • Page 81 (unless that character is the prime compression character). 3. In Data Facility Hierarchical Storage Manager, the process of moving data instead of allocated space during migration and recall in order to release unused space. 4. Contrast with decompression. COMx Port: A serial communications port on a PC. MT4X56USB...
  • Page 82 Digital Service, level 1 (DS1): The 1.544M bps voice standard (derived from an older Bell System standard) for digitized voice transmission in North America. The 1.544M bps consists of 24 digitally-encoded 64 Kbps voice channels (north America) and 2.048M bps (30 channels) elsewhere. MT4X56USB...
  • Page 83 The use of FECN and BECN is called explicit congestion management. Some end-to-end protocols use FECN or BECN, but usually not both options together. With this method, a congestion condition is identified and fixed before it becomes critical. Contrast with “implicit congesion”. MT4X56USB...
  • Page 84 High-level Data Link Control (HDLC): An ISO standard, bit-oriented data communications protocol that provides nearly error-free data transfers. Host: The host computer system where the Universal Serial Bus host controller is installed. This includes the host hardware platform (CPU, bus, etc.) and the operating system in use. MT4X56USB...
  • Page 85 Key Service Unit (KSU): A small device containing the switching electronics for a business key telephone system (KTS). Key Set: A phone set with several buttons for call holding, line pickup, intercom, autodialing, etc. Also called a touchtone phone (Ericsson) and a KTS (Key Telephone Set). MT4X56USB...
  • Page 86 Modems can be internal and fit into an expansion slot, or external and connect to a serial port. MT4X56USB...
  • Page 87 CCITT X.25 recommendation. Packet Assembler/Dissembler (PAD): Used by devices to communicate over X.25 networks by building or stripping X.25 information on or from a packet. Packet Data: The information format (“packetized”) used for packet-mode calls. MT4X56USB...
  • Page 88 Random Access Memory (RAM): A computer’s primary workspace. All data must be stored in RAM (even for a short while), before software can use the processor to manipulate the data. Before a PC can do anything useful it must move programs from disk to RAM. When you turn it off, all information in RAM is lost. MT4X56USB...
  • Page 89 This connection lasts for the duration of the call, after which each segment can be used as part of a different channel. Contrast with leased line. Switched Network: A network in which a temporary connection is established from one point via one or more segments. MT4X56USB...
  • Page 90 Tone dialing: One of two methods of dialing a telephone, usually associated with Touch-Tone® (push button) phones. Compare with pulse dialing. Topology: Physical layout of network components (cables, stations, gateways, and hubs). Three basic interconnection topologies are star, ring, and bus networks. MT4X56USB...
  • Page 91 Unshielded Twisted Pair (UTP): Telephone-type wiring. Tansmission media for 10Base-T. Upstream: The direction of data flow towards the host. An upstream port is the port on a device electrically closest to the host that generates upstream data traffic from the hub. Upstream ports receive downstream data traffic. MT4X56USB...
  • Page 92 Contrast “Red Alarm” and “Blue Alarm”. Zero Byte Time Slot Interchange (ZBTSI): A method for allowing 64 Kbps unrestricted user data (allowing all 0s in the user data). An alternative to (but not as popular as) B8ZS. MT4X56USB...

  • Page 93: Index

    Bell 212A mode ... 41 Blacklisting ... 47 Break Control command ... 46 Break signal ... 46 Cable connectors ... 10 Cabling your MT4X56USB ... 13 Call Waiting ... 59 Callback security displaying settings ... 44 setup password ... 47 storing a dialing command ...
  • Page 94 Inactivity timer ... 49 Inactivity Timer command ... 46 Indicators ... 58 Information Request command ... 42 Initialization strings ... 40, 59 Installing MT4X56USB Drivers Windows 2000 ... 23 Windows 95 ... 19 Windows 98 ... 16 Windows NT ... 21, 23 Installing V.90 modems...
  • Page 95 Protocol Result Code command ... 47 MT4X56USB Pulse Dialing command ... 42 Rate, maximum data ... 49 Read Register Value command ... 42 Recording MT4X56USB information ... 71 Registration Number (FCC) ... 75 Regulatory information ... 74 Remote configuration Changing the escape character ... 55 Commands ...
  • Page 96 Uninstalling MultiModemUSB in Windows 2000 ... 26 Uninstalling MultiModemUSB in Windows 9 ... 18 Uninstalling MultiModemUSB in Windows 95 ... 20 Uninstalling MultiModemUSB in Windows NT 4.0 . 22 Unpacking the MT4X56USB ... 12 Upgrade MT4X56USB firmware Overview ... 66 Procedure ... 66 Upgrading the modem ...

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