Multi-Tech Systems MT4X56USB manual

Four USB V .90 Modems MultiModemUSB Model MT4X56USB User Guide[...]

User Guide 88310952 Revision C MultiModem USB (Model MT4X56 USB ) This publication may not be reproduced, in whole or in part, without prior expressed written permission from Multi-T ech Systems, Inc. All rights reserved. Copyright © 1999, by Multi-T ech Systems, Inc. Multi-T ech Systems, Inc. makes no representations or warranties with respect to[...]

Contents Chapter 1 - Introduction and Description Introduction ................................................................................................................... .................................... 6 Features ...........................................................................................................................[...]

Loopback T ests ................................................................................................................. .............................. 60 Local Analog Loopback T est (V .54 Loop 3) ....................................................................................... ........ 61 Remote Digital Loopback T est (V .54 Loop 2[...]

Four USB V .90 Modems Chapter 1 - Introduction and Description[...]

MultiModemUSB User Guide MT4X56USB 6 Introduction The MultiModemUSB, model MT4X56USB, is a Universal Serial Bus (USB) Concentrator that contains four full-featured V .90 modems and a USB port which allows additional MultiModemUSBs to be daisy-chained together . These features allow any system running Windows 95/98, Windows NT 4.0, or Windows 2000 a[...]

Chapter 1 - Introduction and Description MT4X56USB 7 T echnical Specifications The MT4X56USB conforms to the following specifications. USB Ports • Interface: USB T ype A and T ype B • Speed: up to 12 Mbs Modems • Ports: 4 • Data Rates and Standards: 56 Kbps downloading from V .90/K56flex servers; V .90/K56flex, enhanced V .34, V .32bis, and[...]

MultiModemUSB User Guide MT4X56USB 8 Chapter 3 - Software Loading and Configuration This chapter provides the necessary information to verify if your system supports USB and describes the process for installing the appropriate device drivers. Chapter 4 - A T Commands, S-Registers and Result Codes This chapter describes the commands used to control [...]

Chapter 1 - Introduction and Description MT4X56USB 9 Front Panel The front panel has four groups of LEDs that provide the status of the four port connections, plus a LED that provides the status of Hub activity and and a LED that provides the status of System activity . Figure 1-2. Front Panel Modem Ports (Ports 1, 2, 3, and 4) Modem LEDs are Green[...]

MultiModemUSB User Guide MT4X56USB 10 Back Panel The cable connections for the MT4X56USB are made at the back panel. Three groups of cables are used; four ports for RJ-1 1 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. USB - A POWER USB - B [...]

Four USB V .90 Modems Chapter 2 - Installation[...]

MultiModemUSB User Guide MT4X56USB 12 Unpacking The shipping box contains the MT4X56USB, four RJ-1 1 cables, one USB cable, an external power supply and cable, your Quick Start Guide, and three disks (i.e., three disks for the MT4X56USB driver software and one disk for the MT4X56USB User Guide). Inspect the contents for signs of any shipping damage[...]

Chapter 2 - Installation MT4X56USB 13 Cabling your MT4X56USB Cabling your MT4X56USB involves making the proper cable and power connections. Figure 2-2 shows the back panel connectors and the associated cable connections. T o connect the cables to your MT4X56USB, do the following. 1. Connect the power supply to the MT4X56USB and a live AC outlet. T [...]

MultiModemUSB User Guide MT4X56USB 14[...]

Four USB V .90 Modems Chapter 3 - Software Loading and Configuration[...]

MultiModemUSB User Guide MT4X56USB 16 Introduction MT4X56USB software installation consists of verifying that your system supports USB and then installing the appropriate device drivers. Multitech provides the driver software on two diskettes. Disk 1 contains the driver software for Windows 98/95, Disk 2 contains the driver software for Windows NT [...]

Chapter 3 - Software Loading and Configuration MT4X56USB 17 6. The Add New Hardware W izard dialog box displays the message “What do you want Windows to do?”. Ensure that the default is enabled (Search for the best driver for your device.) and click Next > . 7. The Add New Hardware Wizard dialog box displays the message “Windows will searc[...]

MultiModemUSB User Guide MT4X56USB 18 9. The driver files are copied to your Windows System directory . 10. Once the files have been copied to your PC, the Add New Hardware W izard dialog box is displayed and indicates that Windows has finished installing the software for your hardware device. Click Finish. Several screens are displayed indicating [...]

Chapter 3 - Software Loading and Configuration MT4X56USB 19 MT4X56USB Drivers for Windows 95 This section details the process for loading the software. For Windows 95, only version OSR2.1, Revision C, offers support for USB peripherals. If you are unsure that your Windows 95 system supports USB, refer to the “System USB Support” section at the [...]

MultiModemUSB User Guide MT4X56USB 20 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. T ype A: in the “Copy files from” field and click OK . The driver files will be copied to your system. 8. Several screens are displayed indicating that port[...]

Chapter 3 - Software Loading and Configuration MT4X56USB 21 MT4X56USB Drivers for Windows NT 4.0 Because NT 4.0 does not support USB, Multi-T ech provides a USB stack that will be installed along with the necessary drivers. T o do this, you must have have NT Service Pack 3.00 or higher and an account that has administrative privileges. Note : “Pl[...]

MultiModemUSB User Guide MT4X56USB 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. 1 1. Reboot your system. Note : The System LED sh[...]

Chapter 3 - Software Loading and Configuration MT4X56USB 23 MT4X56USB Drivers for Windows 2000 This section provides the procedure for loading MT4X56USB driver software in a Windows 2000 operating system. Note : “Plug-and-Play” operations are supported in a Windows 2000 operating system. 1. Power up your Windows 2000 system. 2. Ensure that the [...]

MultiModemUSB User Guide MT4X56USB 24 6. The Found New Hardware Wizard dialog box displays the message “Locate Driver Files.” Click (check) the box next to “Floppy disk drives” and then click Next > . 7. Windows locates the driver files on the disk and displays the Add New Hardware Wizard dialog box. Click Next > . 8. Microsoft displa[...]

Chapter 3 - Software Loading and Configuration MT4X56USB 25 1 1. The Found New Hardware Wizard dialog box is displayed. It initiates a second search to create the new COM ports. Follow the instructions on the screen. Click Next > . 12. The Found New Hardware Wizard dialog box displays the message “Install Hardware Device Drivers.” Ensure tha[...]

MultiModemUSB User Guide MT4X56USB 26 14. The Found New Hardware W izard dialog box is displayed with the message “Driver Files Search Results.” Click Next > . 15. The Found New Hardware Wizard dialog box is displayed with the message “Windows has finished installing the software for this device.” Click Finish . Several screens are displ[...]

Chapter 3 - Software Loading and Configuration MT4X56USB 27 Installing Y our V .90 Modems After the software drivers are installed, you will need to install your V .90 modems. The installation procedures are identical for Windows 95 and Windows 98. The procedure for Windows NT is more involved and differences will be noted below . The procedures fo[...]

MultiModemUSB User Guide MT4X56USB 28 3. The Install New Modem dialog box is displayed indicating that Windows NT ( or just “Windows” for Windows 95/98) will now try to detect your modem. READ CAREFULL Y! • For Windows 95 / 98 operating systems, ensure that the “Don’t detect my modem; I will select it” option is NOT enabled (the check b[...]

Chapter 3 - Software Loading and Configuration MT4X56USB 29 5. The Install New Modem dialog box is displayed identifying the modem you had selected. Enable the “Selected ports” option and highlight the Communications ports required (e.g., COM5, COM6, COM7, and COM8), then click Next > . 6. The program installs the modems and prompts you to r[...]

MultiModemUSB User Guide MT4X56USB 30 8. The Install New Modem dialog box is displayed indicating that the modem has been set up successfully . Click Finish . 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 [...]

Chapter 3 - Software Loading and Configuration MT4X56USB 31 Installing Y our V .90 Modems (Windows 2000) Follow the procedures below to install your V .90 modems in a Windows 2000 operating system. 1. Click Start | Settings | Control Panel | Phone and Modems option. 2. The Location Information dialog box is displayed. Note : This is for first-time [...]

MultiModemUSB User Guide MT4X56USB 32 5. The Add/Remove Hardware Wizard dialog box is displayed. 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 [...]

Chapter 3 - Software Loading and Configuration MT4X56USB 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 .[...]

MultiModemUSB User Guide MT4X56USB 34 Windows 95/98 Configuration Utility The Windows 95 and Windows 98 Configuration utilities are located in your Windows System directory . These utilities allow you to manage various resources of your MT4X56USB. Y ou can: • check the version numbers and other information regarding the drivers, • uninstall the[...]

Chapter 3 - Software Loading and Configuration MT4X56USB 35 3. From the MultiModemUSB USB Properties dialog box, click V ersion . The V ersion tab is displayed. The V ersion 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 dialo[...]

MultiModemUSB User Guide MT4X56USB 36 Windows NT 4.0/2000 Configuration Utility The Windows NT 4.0 and Windows 2000 Configuration utilities are located in your Windows System directory . Note : The steps below display Windows NT 4.0 dialog boxes. The Windows 2000 dialog boxes are similar . These utilities allow you to manage various resources of yo[...]

Chapter 3 - Software Loading and Configuration MT4X56USB 37 3. From the MultiModemUSB USB Properties dialog box, click V ersion . The V ersion tab is displayed. The V ersion tab contains a list of all of the MT4X56USB files, each file's version number , size, date created, and a brief description. 4. T o remove the program files, use the Add/R[...]

MultiModemUSB User Guide MT4X56USB 38[...]

Four USB V .90 Modems Chapter 4 - A T Commands, S-Registers and Result Codes[...]

MultiModemUSB User Guide MT4X56USB 40 Introduction The A T commands are used to control the operation of your modem. They are called AT commands because each command must be preceded by the characters AT to get the AT tention of the modem. A T commands can be issued only when the modem is in command mode or online command mode. The modem is in comm[...]

Chapter 4 - A T Commands, S-Registers and Result Codes MT4X56USB 41 Command: B n Communication Standard Setting V alues: n = 0–3, 15, 16 Default: 1 and 16 Description: B0 Select ITU-T V .22 mode when modem is at 1200 bps. B1 Select Bell 212A when modem is at 1200 bps. B2 Deselect V .23 reverse channel (same as B3 ). B3 Deselect V .23 reverse chan[...]

MultiModemUSB User Guide MT4X56USB 42 Command: I n Information Request V alues: n = 0–5, 9, 1 1 Default: None Description: I0 Display V .90 protocol supported, modem model, and controller firmware version. I1 Calculate and display ROM checksum (e.g., 12AB ). I2 Check ROM and verify the checksum, displaying OK or ERROR . I3 Display V .90 protocol [...]

Chapter 4 - A T Commands, S-Registers and Result Codes MT4X56USB 43 Command: T T one Dialing V alues: P , T Default: T Description: Configures the modem for DTMF (touch-tone) dialing. Dialed digits are tone dialed until a P command or dial modifier is received. Command: V n Result Code Format V alues: n = 0 or 1 Default: 1 Description: V0 Displays [...]

MultiModemUSB User Guide MT4X56USB 44 Command: &G n V .22bis Guard T one Control V alues: n = 0, 1, or 2 Default: 0 Description: &G0 Disable guard tone. &G1 Set guard tone to 550 Hz. &G2 Set guard tone to 1800 Hz. Note: The &G command is not used in North America. Command: &J n Auxiliary Relay Control V alues: n = 0 Default:[...]

Chapter 4 - A T Commands, S-Registers and Result Codes MT4X56USB 45 Command: &W n Store Current Configuration V alues: n = 0 Default: None Description: &W0 Stores current modem settings in nonvolatile memory and causes them to be loaded at power-on or following the A TZ command instead of the factory defaults. See also the &F command. &[...]

MultiModemUSB User Guide MT4X56USB 46 Command: K n Break Control V alues: n = 0–5 Default: 5 Description: Controls the response of the modem to a break received from the computer , the remote modem, or the B commnd. The response is different for each of three dif ferent states. Data mode. The modem receives the break from the computer: K0 Ente[...]

Chapter 4 - A T Commands, S-Registers and Result Codes MT4X56USB 47 Command: V n Protocol Result Code V alues: n = 0, 1, or 2 Default: 1 Description: V0 Disable the appending of the protocol result code to the DCE speed. V1 Enable the appending of the protocol result code to the DCE speed. V2 Same as V1 . Command: X n XON/XOFF Pass-Through V [...]

MultiModemUSB User Guide MT4X56USB 48 Command: +++A T<CR> Escape Sequence V alues: n/a Description: Puts the modem in command mode (and optionally issues a command) while remaining online. T ype +++A T and up to ten command characters, then press ENTER. Used mostly to issue the hang-up command: +++A TH<CR> . Command: %%%A T<CR> Re[...]

Chapter 4 - A T Commands, S-Registers and Result Codes MT4X56USB 49 S-Registers Certain modem values, or parameters, are stored in memory locations called S-registers. Use the S command to read or to alter the contents of S-registers (see previous section). Register Unit Range Default Description S0 1 ring 0, 1–255 1 Sets the number of rings unti[...]

MultiModemUSB User Guide MT4X56USB 50 S38 decimal 0–23 1 Sets “downstream” data rate where K56flex provides rates of 32,000 to 56,000 in 2,000 bps increments, V .90 provides rates of 28,000 to 56,000 bps in increments of 1,333 bps. 0 = V .90 disabled 1 = V .90 autorate K56flex rates 2 = 28,000 bps 2 = 32,000 bps 3 = 29,333 bps 3 = 34,000 bps [...]

Chapter 4 - A T Commands, S-Registers and Result Codes MT4X56USB 51 Result Codes In command mode your modem can send responses called result codes to your computer . Result codes are used by communications programs and can also appear on your monitor . T erse V erbose Description 0O K Command executed 1 CONNECT Modem connected to line 2 RING Ring s[...]

MultiModemUSB User Guide MT4X56USB 52 * EC is added to these result codes when the extended result codes configuration option is enabled. EC is replaced by one of the following codes, depending on the type of error control connection: V42bis —V .42 error control (LAP-M) and V .42bis data compression V42 —V .42 error control (LAP-M) only MNP5 ?[...]

Four USB V .90 Modems Chapter 5 - Remote Configuration[...]

MultiModemUSB User Guide MT4X56USB 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 A T commands to a remote MT4x56USB for maintenance or troubleshooting as if you were on- site. Remote Config[...]

Chapter 5 - Remote Configuration and Management MT4X56USB 55 Changing the Remote Escape Character T o increase security , you can change a remote modem’ s remote configuration escape character . The remote configuration escape character is stored in register S9 . The factory default is 37, which is the ASCII code for the percent character (%). Se[...]

MultiModemUSB User Guide MT4X56USB 56[...]

Four USB V .90 Modems Chapter 6 - T roubleshooting[...]

MultiModemUSB User Guide MT4X56USB 58 Introduction Y our 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. However [...]

Chapter 6 - T roubleshooting MT4X56USB 59 • a wrong number • no modem at the other end • a faulty modem, computer , or software at the other end • incompatibility between modems Y ou can narrow the list of possibilities by using extended result codes. Extended result codes are enabled by default. If they have been disabled, enter A TV1X4 an[...]

MultiModemUSB User Guide MT4X56USB 60 • If you have extension phones on the same line as your modem, you or someone else can interrupt the connection by picking up another phone. If this is a frequent problem, disconnect the extension phones before using the modem, or install another phone line especially for the modem. • Check for loose connec[...]

Chapter 6 - T roubleshooting MT4X56USB 61 Local Analog Loopback T est (V .54 Loop 3) In this test, data from your computer or terminal is sent to your modem’ s transmitter , converted into analog form, looped back to the modem’s receiver , converted into digital form, and then sent to your monitor for verification. No connection to the phone li[...]

MultiModemUSB User Guide MT4X56USB 62 Remote Digital Loopback T est (V .54 Loop 2) The remote digital loopback test tests the phone lines and the circuits of both your modem and a remote modem. In this test, your modem must be on line with another modem that is set up to respond to a request for remote digital loopback. (Note that some modems might[...]

Chapter 6 - T roubleshooting MT4X56USB 63 Local Digital Loopback T est (V .54 Loop 2) The local digital loopback test is identical to the remote digital loopback test with one exception. Instead of using your modem to signal a remote modem to place itself in digital loopback mode, your modem is placed in digital loopback mode while the remote modem[...]

MultiModemUSB User Guide MT4X56USB 64 Windows 95/98 T roubleshooting If after installing the Microsoft USB supplement ( usbsupp.ex e), Windows Plug-and-Play does not auto-detect the modem, perform the following steps: 1. Open the System icon from the control panel and select the Device Manager T ab. 2. Double-click the Universal Serial Bus Controll[...]

Four USB V .90 Modems Chapter 7 - Upgrade Procedure[...]

MultiModemUSB User Guide MT4X56USB 66 Introduction Y our modem is controlled by semi-permanent software (firmware) that is stored in flash memory . Firmware is nonvolatile; it remains stored in memory when the modem is turned off. However , it can be changed by either the manufacturer or the user as bugs are fixed or new features are added. Since t[...]

Chapter 7 - Upgrade Procedure MT4X56USB 67 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-T ech Web Site 1. If you are not [...]

MultiModemUSB User Guide MT4X56USB 68 Step 6: Upgrade the Modem’ s Firmware At various times, Multi-T ech may add enhancements and/or fixes to the modem firmware. Flash technology allows you to load these upgrades into the PROM. Do the following. 1. Download FLASHPRO.ZIP and a new .HEX file from the Multi-T ech FTP or W eb site. 2. Unzip the FLAS[...]

Four USB V .90 Modems Chapter 8 - Service, W arranty and T ech Support[...]

MultiModemUSB User Guide MT4X56USB 70 Introduction This chapter provides the information necessary for receiving service or support for your MT4X56USB. The chapter includes Multi-T ech’s license agreement, a description of the warranty , and provides instructions for contacting the Service Department, T echnical Support group, and various Multi-T[...]

Chapter 8 - Service, W arranty and T ech Support MT4X56USB 71 Limited W arranty Multi-T ech Systems, Inc. (“MTS”) warrants that its products will be free from defects in material or workmanship for a period of two years from the date of purchase, or if proof of purchase is not provided, two years from date of shipment. MTS MAKES NO OTHER W ARRA[...]

MultiModemUSB User Guide MT4X56USB 72 Contacting T ech Support via E-mail If you prefer to receive service on-line, via the internet, you can contact T ech Support via e-mail at the following address: http://www .multitech.com/ Service If your tech support specialist decides that service is required, your MT4X56USB may be sent (freight prepaid) to [...]

Four USB V .90 Modems Appendices[...]

MultiModemUSB User Guide MT4X56USB 74 Appendix A - Regulatory Information Class B Statement FCC Part 15 This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential instal[...]

Appendices MT4X56USB 75 FCC Part 68 T elecom 1. This equipment complies with Part 68 of the Federal Communications Commission (FCC) rules. On the outside surface of this equipment is a label that contains, among other information, the FCC registration number and ringer equivalence number (REN). If requested, this information must be provided to the[...]

MultiModemUSB User Guide MT4X56USB 76 F AX Branding Statement The T elephone Consumer Protection Act of 1991 makes it unlawful for any person to use a computer or other electronic device, including fax machines, to send any message unless such message clearly contains the following information: • Date and time the message is sent • Identificati[...]

Appendices MT4X56USB 77 EMC, Safety and T erminal Directive Compliance The CE mark is affixed to this product to confirm compliance with the following European Community Directives: Council Directive 89/336/EEC of 3 May 1989 on the approximation of the laws of Member States relating to electromagnetic compatibility . and Council Directive 73/23/EEC[...]

MultiModemUSB User Guide MT4X56USB 78 Appendix B - V .90 Support Introduction V .90 is the ITU designation for what had formerly been called V .pcm. The ITU recommendation V .90 was determined at a meeting in Geneva ending February 6, 1998. V .90 will replace K56flex and other proprietary solutions for PCM connections. Dual-mode client modem code w[...]

Four USB V .90 Modems Glossary of T erms[...]

MultiModemUSB User Guide MT4X56USB 80 A Analog signal: A waveform which has amplitude, frequency and phase, and which takes on a range of values between its maximum and minimum points. Analog T ransmission: One of two types of telecommunications which uses an analog signal as a carrier of voice, data, video, etc. An analog signal becomes a carrier [...]

Glossary MT4X56USB 81 Bus Enumeration : Detecting and identifying Universal Serial Bus devices. Byte: The unit of information a computer can handle at one time. The most common understanding is that a byte consists of 8 binary digits (bits), because that’s what computers can handle. A byte holds the equivalent of a single character (such as the l[...]

MultiModemUSB User Guide MT4X56USB 82 Congestion: A network condition where there is too much data traffic. The ITU I.233 standard defines congestion managemennt in terms of speed and burstiness. Congestion notification: The function in frame relay that ensures that user data transmitted at a rate higher than the CIR are allowed to slow down to the[...]

Glossary MT4X56USB 83 Digital Signal: A discrete or discontinuous signal (e.g., a sequence of voltage pulses). Digital devices, such as terminals and computers, transmit data as a series of electrical pulses which have discrete jumps rather than gradual changes. Digital Signaling Rates (DSn): A hierarchical system for transmission rates, where “D[...]

MultiModemUSB User Guide MT4X56USB 84 Extended Super Frame (ESF): One of two popular formats for framing bits on a T1 line. ESF framing has a 24-frame super-frame, where robbed bit signaling is inserted in the LSB (bit 8 of the DS-0 byte) of frames 6, 12, 18 and 24. ESF has more T1 error measurement capabilities than D4 framing. Both ESF and B8ZS a[...]

Glossary MT4X56USB 85 Host Controller : The host’s Universal Serial Bus interface. A hardware device that provides the interface to the Host Controller Driver (HCD) and the USB bus. Host Controller Driver (HCD) : Software that provides an interface to the USB Driver and the Host Controller . (The interface to the Host Controller is defined by the[...]

MultiModemUSB User Guide MT4X56USB 86 L LAPB: Link Access Procedure Balanced; based on the X.25 Layer 2 specification. A full-duplex, point-to-point, bit- synchronous protocol commonly used as a data link control protocol to interface X.25 DTEs. LAPB is the link initialization procedure that establishes and maintains communications between the DTE [...]

Glossary MT4X56USB 87 Multiplexer (Mux): 1. A device that takes several input signals and combines them into a single output signal in such a manner that each of the input signals can be recovered. 2. A device capable of interleaving the events of two or more activities or capable of distributing the events of an interleaved sequence to the respect[...]

MultiModemUSB User Guide MT4X56USB 88 Packet Mode: Refers to the switching of chunks of information for different users using statistical multiplexing to send them over the same transmission facility . Parity bit: An extra bit attached to each byte of synchronous data used to detect errors in transmission. Permanent Virtual Circuit (PVC): A connect[...]

Glossary MT4X56USB 89 Rate Enforcement: The concept in frame relay where frames sent faster than the CIR are to be carried only if the bandwidth is available, otherwise they are to be discarded. (The frame relay network assumes that anything exceeding the CIR is of low priority .) Rate enforcement makes sure that the network will not get so congest[...]

MultiModemUSB User Guide MT4X56USB 90 Synchronous Data Link Control (SDLC): A discipline conforming to subsets of the Advanced Data Communications Control Procedures (ADCCP) of the American National Standards Institute (ANSI) and High-level Data Link Control (HDLC) of the International Organization for Standardization, for managing synchronous, cod[...]

Glossary MT4X56USB 91 T ransmission Control Protocol (TCP): A communications protocol used in Internet and in any network that follows the US Department of Defense standards for internetwork protocol. TCP provides a reliable host-to-host protocol between hosts in packet-switched communications networks and in interconnected systems of such networks[...]

MultiModemUSB User Guide MT4X56USB 92 USB: See Universal Serial Bus. USBD : See Universal Serial Bus Driver . USB Performance categories : Low Speed (Interactive Devices at 10-100 Kb/s); Medium Speed (Phone, Audio, Compressed Video at 500Kb/s - 10Mbp/s); High Speed (V ideo, Disk at 25-500 Mb/s) V V .25bis: An ITU-T standard for synchronous communic[...]

MT4X56USB 93 Index Index Symbols 56K operation digital loss when used with PBX ........................ 50 disabling the auto rate ....................................... 50 A Abort timer ............................................................. 49 Analog loopback test ............................................. 61 Answer command ............[...]

MT4X56USB 94 MultiModemUSB User Guide Commission Decision "CTR21" ............................. 77 Communication Standard command ..................... 41 Communications Mode command ......................... 44 Communications programs ............................ 40, 58 Configuration selecting reset configuration ........................[...]

MT4X56USB 95 Index For Windows 95 ................................................. 19 For Windows 98 ................................................. 16 For Windows NT 4.0 .......................................... 21 Local analog loopback test .................................... 61 Local digital loopback test ...................................[...]

MT4X56USB 96 MultiModemUSB User Guide Select Maximum MNP Block Size command ........ 45 Select Stored Configuration command .................. 45 Service .................................................................. 72 Set Register V alue command ................................ 42 Setup password ...............................................[...]