1. Manuals
  2. Brands
  3. Digital Equipment Manuals
  4. Server
  5. DECserver 900MC
  6. Installation and configuration manual

Digital Equipment DECserver 900MC Installation And Configuration Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
DECserver 900MC
Installation and Configuration
Part Number: EK-DSRVX-IC. A01
February 1997
This manual describes how to install and configure the DECserver 900MC.
Revision/Update Information:
This is a new document.

Advertisement

Table of Contents
loading

Related Manuals for Digital Equipment DECserver 900MC

Summary of Contents for Digital Equipment DECserver 900MC

  • Page 1 DECserver 900MC Installation and Configuration Part Number: EK-DSRVX-IC. A01 February 1997 This manual describes how to install and configure the DECserver 900MC. Revision/Update Information: This is a new document.
  • Page 2 Digital Equipment Corporation makes no representations that the use of its products in the manner described in this publication will not infringe on existing or future patent rights, nor do the descriptions contained in this publication imply the granting of licenses to make, use, or sell equipment or software in accordance with the description.

  • Page 3: Table Of Contents

    What is the DECserver 900MC? ........
  • Page 4 2 Installing the Module Overview ..............2-1 Introduction .
  • Page 5 Adding the DECserver 900MC to the Database ........
  • Page 6 8 Removing the Module Overview ..............8-1 Introduction .
  • Page 7 D Microcom Networking Protocol Overview ..............D-1 Introduction.
  • Page 8 A-3 Problem Solving Using the LEDs ..........A-5 B-1 Compatible Cables for DECserver 900MC Console Port ......B-2 B-2 DECserver 900MC Console Port Pin Assignments.

  • Page 9: Preface

    Preface Overview Purpose of This Document This manual describes how to install, configure, and use the DECserver 900MC module. It also provides problem solving, connector and cable assignments, product specifications, AT commands, and information on the Microcom Networking Protocol (MNP).

  • Page 10: Organization

    Organization This manual is organized as follows: Section Description Chapter 1 Provides an overview of the DECserver 900MC module and describes its features. Chapter 2 Provides instructions for installing the DECserver 900MC module in a DEChub 900 MultiSwitch. Chapter 3 Provides instructions for installing the setup port on the DECserver 900MC.

  • Page 11: Conventions And Terms

    Conventions and Terms Overview This book uses the following conventions. Convention Description This special type in examples indicates system Special Type output. Boldface Boldface type in examples indicates user input. <Return> Indicates that you should press the Return key. Terms Used in This Manual This book uses the following terms: Term Definition...

  • Page 12: Associated Documents

    Associated Documents The following documents provide related information about the module. For information on how to order additional documentation, see the ordering information provided in this preface. Title and Order Description DEChub 900 MultiSwitch Provides installation, use, security, and Owner’s Manual troubleshooting information for the DEChub 900 MultiSwitch.
  • Page 13 Title and Order Description clearVISN Installation Provides pre- and post-installation information, as well as actual installation procedures for each application. clearVISN Product Provides an overview of clearVISN, an Overview explanation of each application and descriptions of all concepts necessary to understand and use the application efficiently.

  • Page 14: Correspondence

    To read the Bulletin Board System, set your modem to 8 bits, no parity, 1 stop bit and dial 508-486-5777 (U.S.) The Digital Equipment Corporation Network Products Business Home Page on the World Wide Web is located at the following addresses: North America: http://www.networks.digital.com...

  • Page 15: How To Order Additional Documentation

    P.O. Box CS2008 Puerto Rico) Nashua, New Hampshire 03061 (Place prepaid orders from Puerto Rico with the local Digital subsidiary: 809-754-7575) By Mail DIGITAL EQUIPMENT of CANADA LTD. (Canada) 940 Belfast Road Ottawa, Ontario, Canada K1G 4C2 Attn.: A&SG Business Manager Internationally DIGITAL EQUIPMENT CORPORATION Attn.: A&SG Business Manager...

  • Page 17: Safety

    Safety Overview Any warning or caution that appears in this manual is defined as follows:. WARNING Contains information to prevent personal injury. CAUTION Contains information to prevent damage to equipment. VORSICHT Enthält Informationen, die beachtet werden müssen um den Benutzer vor Schaden zu bewahren. ACHTUNG Enthält Informationen, die beachtet werden müssen um die Gerate vor Schaden zu bewahren.
  • Page 18 The cautions that must be observed for the hardware described in this manual are listed below in English, German, French, and Spanish. CAUTION This action deletes all configured settings and replaces them with factory default values. All configuration settings will be lost. ACHTUNG Bei diesem Vorgang werden alle Konfigurationseinstellungen gelöscht und die...

  • Page 19: Product Introduction

    Chapter 1 Product Introduction Overview Introduction This chapter describes the DECserver 900MC module and its features. In This Chapter Topic Page What is the DECserver 900MC? Features Product Introduction 1-1...

  • Page 20: What Is The Decserver 900Mc

    (MB) of memory and runs Version 2.1 (or greater) of the DECserver Network Access Server (DNAS) software. You can install and configure the DECserver 900MC in a DEChub 900 MultiSwitch (also referred to as DEChub 900) or as a stand-alone unit in a DEChub ONE or DEChub ONE-MX docking station.

  • Page 21: Features

    Features Features Your DECserver 900MC includes the following features. Hot Swap The module’s hot swap capability allows you to install or remove the module from a DEChub 900 without turning off power to the hub. Configuration and Management The module offers the following configuration and management options: •...

  • Page 22: Special Features

    Features Special Features The module’s built-in modems include the following special features: • Enhanced operation in cellular environments • Multi-protocol auto-answering to automatically answer incoming calls using various modulation protocols • Trellis coded modulation for forward error correction • Near and far end echo cancellation •...

  • Page 23: Installing The Module

    Installing the Module Overview Introduction This chapter explains how to install the DECserver 900MC in a DEChub 900 Multiswitch. To install the module as a standalone unit, refer to the DEChub One (or DEChub ONE-MX) Installation manual. In This Chapter...

  • Page 24: Module Components

    Module Components Module Components This section describes the front and back panels of the DECserver 900MC module and the components of each panel. For problem-solving information using the LEDs, refer to Appendix A, Problem Solving. 2-2 Installing the Module...

  • Page 25: Front Panel Features

    Module Components Front Panel Features Table 2-1 describes the front-panel components that are illustrated in Figure 2-1. Table 2-1: Front Panel Components Item Icon Name Description Power LED Lights when the module has power. Module OK Lights when the module passes self-test.
  • Page 26 Module Components Table 2-1: Front Panel Components Item Icon Name Description Serial Port Provides connection for an Connector asynchronous device. The serial port connector is known as the console port and referred to as Port 9 by the software. Modem Port Connects the built-in modem to a Connectors two-wire telephone line.
  • Page 27 Module Components Figure 2-1: Front Panel LEDs and Connector Ethernet NPB-0692-96F Installing the Module 2-5...

  • Page 28: Back Panel Features

    Module Components Back Panel Features Table 2-2 describes the back panel components that are illustrated in Figure 2-2. Table 2-2: Back Panel Components Item Name Description Locking tab Locks the module into a DEChub 900 backplane or into a DEChub ONE docking station.

  • Page 29: Back Panel Features

    Module Components Figure 2-2: Back Panel Features Installing the Module 2-7...

  • Page 30: How To Install The Module

    How to Install the Module How to Install the Module The hot-swap feature allows you to install the module into the DEChub 900 without turning off power to the hub. Seating the module initiates the module’s powerup sequence if enough power is available. To install the module, complete the following tasks: Task 1: Compare the Power Ratings Compare the module’s power ratings with the values shown in the Hub Manager Status...

  • Page 31: Task 2: Seat The Module

    How to Install the Module Task 2: Seat the Module To seat the module into the DEChub 900 MultiSwitch, complete the following steps: Step Action Place the module’s mounting tab (1) into a mounting slot on the DEChub 900 MultiSwitch. Pull up on the release lever (2) to its unlocked position.

  • Page 32: Task 3: Verify Initial Led Operation

    How to Install the Module Task 3: Verify Initial LED Operation If this is a new installation, turn on the power to the DEChub 900 MultiSwitch. If the module was installed while the DEChub 900 was powered up, seating the module will initiate the module’s power up sequence.

  • Page 33: Task 4: Connect Port Cables

    Figure 2-5: Connecting the Cable e rn E th NPB-0694-96F NOTE The DECserver 900MC does not support the out-of-band management (OBM) port or the setup port on the DEChub One. However, console redirect is supported. Installing the Module 2-11...

  • Page 35: Installing The Setup Port Cable

    Chapter 3 Installing the Setup Port Cable Overview Introduction This chapter describes how to connect the DECserver 900MC module to the setup port on a DEChub 900 MultiSwitch. In This Chapter Topic Page Signaling Standards Setup Port Device Cabling Connecting the Setup Port...

  • Page 36: Signaling Standards

    Signaling Standards Signaling Standards Signals from the DEChub 900 Hub setup port conform to the EIA-232D signaling standard at 9600 baud. To the user, the port appears as a data terminal equipment (DTE) device. The DEChub 900 Hub Manager setup port is compatible with devices that use the EIA- 423 signaling standard.

  • Page 37: Setup Port Device Cabling

    Setup Port Device Cabling Setup Port Device Cabling The setup port (Figure 3-1) on the DEChub 900 MultiSwitch can be connected to a setup port device (a terminal or personal computer). Use the following cables and adapters to connect the setup port to a setup port device: If the setup port Use this cable...

  • Page 38: Connecting The Setup Port

    Connecting the Setup Port Connecting the Setup Port To connect a personal computer or a terminal (3) to the setup port (2) on the DEChub 900 MultiSwitch , complete the following steps: Step Action Ensure that the transmit and receive baud rates on the setup port device (3) are set to 9600 baud.

  • Page 39: Setup Port Cabling Components

    Connecting the Setup Port Figure 3-1: Setup Port Cabling Components DEChub 900 Multiswitch H8571-J BN24H H8575-A NPB-0714-96F The following legend identifies the setup port cabling: Item Description OBM Port Setup Port Setup Port Device Installing the Setup Port Cable 3-5...

  • Page 41: Configuring The Module In A Dechub 900

    Chapter 4 Configuring the Module in a DEChub 900 Overview Introduction This chapter describes how to configure your DECserver 900MC when it resides in a DEChub 900 MultiSwitch. In this Chapter Topic Page DEChub 900 MultiSwitch INSTALLATION MENU [5] Start Redirect Mode...

  • Page 42: Dechub 900 Multiswitch Installation Menu

    DEChub 900 MultiSwitch INSTALLATION MENU DEChub 900 MultiSwitch INSTALLATION MENU The following example shows the DEChub 900 MultiSwitch INSTALLATION MENU. To access the module’s installation menu, you must choose the following option: [5] Start Redirect Mode. The following example shows the dialog associated with this option: DEChub 900 MultiSwitch ========================================================= DEChub 900 MultiSwitch INSTALLATION MENU...

  • Page 43: Start Redirect Mode

    MultiSwitch INSTALLATION MENU, the screen prompts you for a slot number as shown in the following example. After you enter the number of the slot in which the DECserver 900MC is installed (3, in this example), the console is redirected to this slot.

  • Page 44: Using Menus To Configure The Module

    Using Menus to Configure the Module Using Menus to Configure the Module The following screen shows the options available from the DECserver 900MC INSTALLATION MENU when the module is operating in a DEChub 900 configuration. NOTE When your module is installed in the DEChub 900, the slot number where the module is installed appears at the top of the menu.

  • Page 45: Reset With Factory Defaults

    Memory (NVRAM) parameters to be initialized to factory default values followed by a module reset. If you need to reboot the module and retain the current settings, choose option [2] from the DECserver 900MC INSTALLATION MENU. CAUTION This action deletes all configured settings and replaces them with factory default values.

  • Page 46: Reset With Current Settings

    Allow approximately 1 minute for the module to restart. The following example shows the dialog associated with this option: Enter selection: - slot 3 DECserver 900MC ============================================================= RESET WITH CURRENT SETTINGS This selection will reset your system with the current configuration settings.

  • Page 47: Show Current Settings

    This option shows the module’s current settings. If the module is being configured for the first time, some fields are blank. The following example shows the display associated with this option. Enter selection : 3 DECserver 900MC - slot 3 ================================================================= DECserver 900MC,Network Access SW V2.1,HW=V1.4,RO=V6.4-0,SW=BL11, LAT V5.1, LOAD IMAGE:...

  • Page 48: Configure Ip

    [4] Configure IP This option provides you with IP configuration selections. The following example shows the dialog associated with this option: Enter selection : 4 - slot 3 DECserver 900MC ========================================================= IP CONFIGURATION Set SNMP Read/Write Community Set In-Band Interface IP Address...

  • Page 49: Set Snmp Read/Write Community

    The following example shows the dialog associated with this option: Enter selection : 1 - slot 3 DECserver 900MC ================================================================ SET SMNP READ/WRITE COMMUNITY Format: The format for a community name is a string, consisting...

  • Page 50: Set In-Band Interface Ip Address

    The factory default setting is no in-band address. The following example shows the dialog associated with this option: Enter selection : 2 - slot 3 DECserver 900MC ================================================================= IN-BAND INTERFACE IP ADDRESS CONFIGURATION Format: The standard 4 octet dotted decimal notation in which each octet of the address is represented as a decimal separated by a ’.’...

  • Page 51: Installing Flash Ram

    Chapter 5 Installing Flash RAM Overview Introduction This chapter describes how to use a Flash RAM card for loading or upgrading the operational software. The Flash RAM card can be hot swapped and may be inserted and removed at anytime. In This Chapter Topic Page...

  • Page 52: Inserting The Flash Ram Card

    Inserting the Flash RAM Card Inserting the Flash RAM Card The Flash RAM card when properly inserted will protrude from the front panel about 1/4 inch. The Flash RAM card is keyed and cannot be inserted improperly. To insert the Flash RAM card, complete the following steps: Step Action Locate the Flash RAM slot on the front of the module (Figure 5-1).

  • Page 53: Booting The Module

    Booting the Module Booting the Module Once the Flash RAM card is in place, load the operational software by powering the module. Once you boot the DECserver 900MC, the Flash RAM card may be left in place or removed. NOTE You can update Flash RAM by issuing the INITIALIZE FROM ETHERNET IMAGE xxx UPDATE FLASHRAM command from the DECserver 900MC.

  • Page 55: Configuring The Modem Ports Using The Access Server Manager

    Overview Introduction In order to use the DeskPorte Fast+ built-in modems on the DECserver 900MC, you must first configure them. DIGITAL recommends that you use the Access Server Manager application to configure the DECserver 900MC modems. You can also use the Access Server Manager to change modem properties, update the modem firmware, and send commands manually to the modem.

  • Page 56: Adding The Decserver 900Mc To The Database

    Adding the DECserver 900MC to the Database Adding the DECserver 900MC to the Database To configure the DECserver 900MC modems using the Access Server Manager application, you have to: 1) Add the DECserver 900MC to the Access Server Manager’s database.

  • Page 57: Configuring The Modem

    Configuring the Modem Configuring the Modem After starting the Access Server Manager application and opening the Modem dialog, you can: • Use the Configure page to set modem properties for each modem. • Use the Command page to manually send commands to one or more modems. •...
  • Page 58 Configuring the Modem Step Action From the Configuration page in the Modem dialog, select the port whose modem you want to configure or click on Select All to configure all of the modem ports. Click on Properties. 6-4 Configuring the Modem Ports Using the Access Server Manager...
  • Page 59 Configuring the Modem Step Action On the General page, set any or all of the following values: • Phone Uses — tone or pulse dialing. • Serial Port — enter port speed or click on use port settings to set modem speed to be the same as the port speed settings.
  • Page 60 Configuring the Modem Step Action On the Commands page, set the following modem commands, if required. In most cases, you can accept the default settings. • Factory Init — Resets the modem to factory default settings. • DSR follows connect — Sets the DSR (Data Set Ready) state when a connection is established.

  • Page 61: Sending Commands To The Modem

    Configuring the Modem Sending Commands to the Modem To manually send commands to the modem on one or more ports, start the Access Server Manager application and complete the following steps: Step Action Select the access server from the Access Server Manager Browser and click on Open.

  • Page 62: Upgrading Modem Firmware

    Configuring the Modem Step Action Click on Send. (The command you send and the modem’s response appear in the Status box.) Clearing the Status Box: Click on Clear to delete any messages that appear in the Status box. Click on Close when finished. Upgrading Modem Firmware Start the Access Server Manger application and do the following: Step...
  • Page 63 Configuring the Modem Step Action From the drop-down list, select the port whose firmware you want to upgrade or click on Select All to send upgrade firmware on all ports Click on Upgrade Firmware and select the firmware file that you want to use.

  • Page 64: Changing The Country Location

    DECserver 900MC module is used. NOTE The DECserver 900MC must be rebooted in order for the country code to take effect. To change the country code, start the Access Server Manager application and complete...
  • Page 65 From the drop-down list, select the country where you are using the DECserver 900MC access server Click on Set Country Now. Click on Close. Note: The DECserver 900MC must be rebooted in order for the country code to take effect. Configuring the Modem Ports Using the Access Server Manager 6-11...

  • Page 67: Configuring The Modems Ports Using The Console Commands

    Console Commands Overview Introduction In order to use the DeskPorte Fast+ built-in modems on the DECserver 900MC, you must first configure them. DIGITAL recommends that you use the Access Server Manager application to configure the DECserver 900MC modems (see Chapter 6, Configuring the Modem Ports Using the Access Server Manager).

  • Page 68: Setting The Country Code

    Setting the Country Code Before connecting the modem to a telephone line, set the country code for the country in which the DECserver 900MC is used. NOTE In order for the new country code to take effect, you must reboot the DECserver 900MC.

  • Page 69: Setting The Country Code

    Setting the Country Code Table 7-1: Country Codes Country Code Country Code Australia Japan Austria Netherlands Belgium New Zealand Czech Republic Norway Denmark Poland Finland South Africa France Spain Germany Sweden Ireland Switzerland Israel United Kingdom Italy United States Italy SIP Configuring the Modems Ports Using the Console Commands 7-3...

  • Page 70: Logging Out Ports

    Logging Out Ports Logging Out Ports Introduction You can log out a port and reset the port characteristics to their factory defaults or you can log out a port and send a reset signal to the port. Logging Out a Port and Resetting Port Characteristics to Factory Defaults To log out a port and reset the port’s characteristics to the factory defaults, use the following command: LOGOUT PORT port-list FACTORY...

  • Page 71: Communicating With The Modem

    Communicating With the Modem Communicating With the Modem DIGITAL recommends that you use the Access Server Manager application to configure the modem or send commands directly to the modem. If necessary, you can communicate with the modem using a local or remote console. To communicate directly with the modem using the console port, complete the following steps.

  • Page 73: Removing The Module

    Chapter 8 Removing the Module Overview Introduction This chapter describes how to remove the module from a DEChub 900 MultiSwitch. To remove the module from a standalone unit, refer to the DEChub ONE (or DEChub ONE-MX) Installation manual. In This Chapter Topic Page Removing the Cable...

  • Page 74: Removing The Cable

    Removing the Cable Removing the Cable To remove cables from the module, press the release tab (1) on the cable plug, then pull out the cable (see Figure 8-1). Figure 8-1: Removing the Cable e rn E th NPB-0771-96F 8-2 Removing the Module...

  • Page 75: Unseating The Module

    Unseating the Module Unseating the Module To unseat the module from the DEChub 900, complete the following steps: Step Action Hold the module and lift the release lever (1) located at the top of the DEChub 900 slot. While holding up the release lever (2), pivot the module back on its bottom mounting tab (3).

  • Page 77: A Problem Solving

    Appendix A Problem Solving Overview Introduction This appendix describes the LED functions and provides problem solving information. The sections of this appendix are listed below. In This Appendix Topic Page LED Descriptions Normal Powerup Problem Solving Using the LEDs Problem Solving Using the Seven-Segment Display Troubleshooting Tips When Using Your Built-in Modems A-11 Problem Solving A-1...

  • Page 78: Led Descriptions

    LED Descriptions LED Descriptions The module and port LEDs provide dynamic indications of the status of the module and ports. The LEDs can be in various states and can change color depending on the operational status of the module or port and the level of activity on the network. Module LED States The module’s LEDs can be in various states (off, on, or flashing) and can change color depending on the operational status of the module or the level of activity on the...

  • Page 79: Port Led States

    LED Descriptions Port LED States The module also contains an LED on each port. The port LED’s can be in various states (off, orange, or green). Table A-2 shows the possible states for the port LEDs. Table A-2: Port State LEDs LED Name Orange Green...

  • Page 80: Normal Powerup

    Normal Powerup Normal Powerup When the module’s power is initially turned on, the following events occur: Event Description The Power LED lights and remains lit. The Port LEDs turn orange. All other LEDs light and then turn off. This verifies that the individual LEDs are operational.

  • Page 81: Problem Solving Using The Leds

    Problem Solving Using the LEDs Problem Solving Using the LEDs When diagnosing a problem with the module, note that the problem is often indicated by the states of the module LEDs. Table A-3 lists the states of the LEDs for various error conditions that can occur during initial installation of the device, along with probable causes and corrective actions to take.
  • Page 82 Problem Solving Using the LEDs Table A-3: Problem Solving Using the LEDs Symptom Probable Cause Corrective Action Power LED is flashing. The module Lift the release lever, connection is faulty. then reseat the module. Faulty DEChub 900 Reinstall the module into slot connection.
  • Page 83 Problem Solving Using the LEDs Table A-3: Problem Solving Using the LEDs Symptom Probable Cause Corrective Action The Network Activity There is low network Ensure that the network LED is off. activity or no network is active. If the Network activity.
  • Page 84 DEChub 900, the Access Software was or later of the DECserver information display does loaded into the Network Access not read: DECserver 900MC. Software. DECserver 900MC but the "race track" pattern is displayed. After correctly installing Defective module. Replace the module.

  • Page 85: Problem Solving Using The Seven-Segment Display

    (The rotating code is referred to as the "race track" pattern.) • When the display codes are off, the DECserver 900MC is not receiving power or the display is broken. In Figure A-1, the first column indicates a horizontal view (standalone). The second column indicates a vertical view (hub) of the codes.

  • Page 86: Seven-Segment Display Codes

    Problem Solving Using the Seven-Segment Display Figure A-1: Seven-Segment Display Codes Initial power is on Initializing Internal testing SIM 1 testing SIM 2 testing Internal testing Internal testing Internal testing Internal testing Network interface external testing Software is loading from Flash RAM or is updating Flash RAM Server is requesting software from network Attempting to retry software load...

  • Page 87: Troubleshooting Tips When Using Your Built-In Modems

    Troubleshooting Tips When Using Your Built-in Modems Troubleshooting Tips When Using Your Built-in Modems This section lists information to aid you when using your built-in modems. For more information on the DECserver Network Access Software, see the Network Access Server Release Notes. For more information on AT command syntax, see Appendix F, AT Commands.
  • Page 88 Troubleshooting Tips When Using Your Built-in Modems Symptom Corrective Action Modem throughput is slower If you are calling another Microcom V.34 than expected. modem and cannot connect at 33400 bps, lower your modem-port speed using the %Bn command. If your connection succeeds, the problem is the quality of your phone lines.

  • Page 89: B Connector And Cable Assignments

    Chapter 2, Installing the Module describes how to connect the port cables. The DECserver 900MC contains nine-ports, 1 asynchronous port and 8 built-in modem ports. The asynchronous port is used as the console port and is known as Port 9 by the DECserver Network Access Software.

  • Page 90: Compatible Cables For The Console Port

    Compatible Cables for the Console Port Compatible Cables for the Console Port This section lists and describes compatible cables for the DECserver 900MC console port. Before connecting cables to the DECserver 900MC console ports, verify the supported modem signals with the person managing the DECserver 900MC. This information is necessary to determine which cables to use.

  • Page 91: 8-Pin Mj Console Connector Information

    900MC uses an 8-pin MJ connector on the console port, which can be configured by the software to support the pin signals indicated in Table B-2. Figure B-1: 8-Pin MJ Description for Console Port NPG-8719-95F Table B-2: DECserver 900MC Console Port Pin Assignments Pins Signal Name Software...

  • Page 92: 8-Pin Mj Telephone Connector Information

    8-Pin MJ Telephone Connector Information This section contains information on the 8-pin MJ telephone connector. The DECserver 900MC uses an 8-pin MJ connector on Ports 1 through 8. Both MP8 and MP6 phone cables are supported. The signal information is displayed in Table B-3.

  • Page 93: C Product Specifications

    Appendix C Product Specifications Overview Introduction This appendix lists the specifications and available parts for the DECserver 900MC. In This Appendix Topic Page Product Specifications Acoustical Specifications Connectors Product Specifications C-1...

  • Page 94: Product Specifications

    Product Specifications Product Specifications Table C-1 lists the product specifications for the DECserver 900MC module. Table C-1: Product Specifications Parameter Specification Environment 5° C to 50° C (41 ° F to 122 ° F) Operating Temperature Relative Humidity 10% to 95% noncondensing Altitude •...

  • Page 95: Schallemissionswerte Werteangaben Nach Iso 9296 Und Iso 7779/Din En277792

    (1 B = 10 dBA). Table C-3 lists the acoustical specifications measured in full conformance with ISO 9296 and ISO 7779/DIN EN27779 for the DECserver 900MC module in German. Table C-3: Schallemissionswerte Werteangaben nach ISO 9296 und ISO 7779/DIN EN277792...

  • Page 96: Connectors

    Connectors Connectors Table C-4 lists the connectors for DECserver 900MC, DEChub ONE, and DEChub ONE-MX. Table C-4: Connectors for the DECserver 900MC Connectors Quantity DECserver 900MC 8-pin MJ DEChub ONE 15-pin D-Sub (AUI Connector) DEChub ONE-MX 15-pin D-Sub (AUI) Redundant power connector (D-Sub)

  • Page 97: D Microcom Networking Protocol

    Appendix D Microcom Networking Protocol Overview Introduction This appendix briefly describes each Microcom Networking Protocol (MNP) class and its features. In This Appendix Topic Page MNP Class 10 and MNP Class 5 Other Classes of MNP Microcom Networking Protocol D-1...

  • Page 98: Mnp Class 10 And Mnp Class 5

    MNP Class 10 and MNP Class 5 MNP Class 10 and MNP Class 5 Each built-in modem on the DECserver 900MC supports Microcom Networking Protocol (MNP) Class 10 and MNP Class 5 Data Compression. The modem is compatible with all Microcom MNP products. Its enhanced MNP service is completely transparent to the user.

  • Page 99: Other Classes Of Mnp

    Other Classes of MNP Other Classes of MNP There are several other classes of MNP. Table D-2 contains a description of each class. Table D-2: Other MNP Classes Class Name Description MNP Class 2 Uses standard asynchronous framing techniques for data transmission and error correction.
  • Page 100 Other Classes of MNP Table D-2: Other MNP Classes Class Name Description MNP Class 6 Allows half-duplex, fast-train high-speed reliable connections with other MNP Class 6 modems at speeds of 4800 to 9600 bps. Universal Link Negotiation allows the modem to automatically connect with other MNP modems at the highest common speed and protocol.

  • Page 101: E Regulatory Requirements

    Appendix E Regulatory Requirements Overview Introduction This appendix contains information on regulatory requirements. In This Appendix Topic Page Regulatory Requirements Information Requested by the Telephone Company Canadian Department of Communications Requirements Regulatory Requirements E-1...
  • Page 102 Otherwise, the telephone company may temporarily disconnect service. Repair of the modem can only be carried out by Digital Equipment Corporation. It is the responsibility of the user requiring service to report the need for service to Digital Equipment Corporation.

  • Page 103: Information Requested By The Telephone Company

    Information Requested by the Telephone Company Information Requested by the Telephone Company If the telephone company requests information about the equipment connected to their lines, you should provide them with the following information: • Telephone number to which the device is connected. •...

  • Page 104: Canadian Department Of Communications Requirements

    Canadian Department of Communications Requirements Canadian Department of Communications Requirements The Canadian Department of Communications 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 the user’s satisfaction. Before installing this equipment, users should ensure that it is permissible to be connected to the facilities of the local telecommunications company.

  • Page 105: Canadian Emi Limits

    Canadian Department of Communications Requirements Canadian EMI Limits This digital apparatus does not exceed the Class A limits for radio noise emissions from digital apparatus set out in the Radio Interference Regulations of the Canadian Department of Communications. Le présent appareil numérique n'émet pas de bruits radioélectriques dépassant les limites applicables aux appareils numériques de la class A prescrites dans le Règlement sur le brouillage radioélectrique édicté...

  • Page 107: Overview

    Appendix F AT Commands Overview Introduction This appendix lists the modem AT commands in alphabetical order. It also contains the commands to change or read registers and the register descriptions. In This Appendix Topic Page AT Commands Commands to Change or Read Registers F-62 Register Descriptions F-63...
  • Page 108 AT Commands AT Commands This section lists all the modem AT commands in alphabetical order. A command argument printed in bold is the command default setting. In most cases, you will not need to change the default setting. NOTE The A/ command is the only command not preceded by “AT” and not followed by a carriage return.
  • Page 109 AT Commands %A n Auto-Reliable Fallback Character Where n is an integer between 0 and 127 indicating an ASCII character (default is 0, the auto-reliable fallback character is disabled). Sets the ASCII character recognized as the auto-reliable fallback character on the answering modem.
  • Page 110 AT Commands \An Maximum MNP Block Size Sets maximum block size for MNP stream link connections. 0 = Sets block size up to a maximum of 64 characters 1 = Sets block size up to a maximum of 128 characters 2 = Sets block size up to a maximum of 192 characters 3 = Sets block size up to a maximum of 256 characters -AnAuto-Retrain Threshold...
  • Page 111 AT Commands \B n Transmit Break Where n is an integer between 1 and 9 indicating the time (in increments of 100 milliseconds) to send the Break. (Default is 300 milliseconds). During a reliable link the Break always equals 300 milliseconds Transmits a Break to the remote system from command state.
  • Page 112 AT Commands &C n Serial Port DCD Control &C0 DCD always On. &C1 DCD follows the state of the carrier from the remote system; DCD turns On after the connect message. &C2 DCD On except momentarily at disconnect. Controls the Carrier Detect (DCD) signal on the serial port. Use this command if your computer requires DCD to be Off at certain times.
  • Page 113 AT Commands Determines whether the answering modem set to auto-reliable mode and auto-answer buffers data from the remote modem during the 3 seconds when it tries to establish a reliable connection. When the modem receives calls both from modems that support MNP and from modems that do not, set \C2.
  • Page 114 AT Commands D <dial string> Dial Where <dial string> is a string of up to 98 characters. Valid dial string characters are: 0-9, dial modifiers, and for tone dialing A, B, C, D, #, and *. The modem ignores invalid characters. Dial strings longer than 98 characters produce an error message. Dials a telephone number and attempts to establish a connection.
  • Page 115 AT Commands (Cell-Side Cellular Call) Sets the modem to operate with a cell-side (remote) cellular phone, for the current connection only. This has the same effect as including the cellular string \N2)M1:E0@M18*H1 in the dial command. These settings use the MNP reliable mode, force power adjustment for cell-side calls, select an initial transmit level of -18 dBm, and force link negotiation to occur at 1200 bps.
  • Page 116 AT Commands Example Pulse dial a local telephone number and tone dial an access code and telephone number by typing: ATD P5551234 T33 56789 (Wait for Dial Tone Before Dialing) Inserted between digits in a dial string, causes the modem to wait for a second dial tone up to the register S7 time delay before dialing the number.
  • Page 117 AT Commands (Bong Detect) Detects an AT&T BELLCORE service prompt to enter a calling card number and authorization. When the modem encounters a “$” modifier within a dial string, it waits to receive this “bong” signal. Once it detects it, the modem continues processing the dial string.
  • Page 118 AT Commands DL Redial the Last Telephone Number Dialed Redials the last telephone number that the modem dialed. D/ n Dial a Stored Telephone Number Where n is a two-digit integer between 01 and 40 that specifies a telephone number previously stored in the directory with the &Zn= or \Pn command.
  • Page 119 AT Commands -D Repeat Dial -D <dial string> Where <dial string> is a string of up to 98 characters. Valid dial string characters are: 0-9, dial modifiers, and for tone dial, #, A, B, C, D and *. The modem ignores invalid characters.
  • Page 120 AT Commands NOTES • Hardware flow control overrides &C and \D settings for CTS. (See \Q.) • The modem ignores &C and \D settings while connected in V.23 half-duplex direct mode (%F3) or ITU-T V.13 (&R2). • When \D4 is set, &D should be set to a value greater than 0. •...
  • Page 121 AT Commands &C Result DCD On (Off for a few seconds at disconnect only), DSR On, CTS On DCD, DSR, and CTS On (Off for a few seconds at disconnect) DCD, DSR, and CTS On (Off for a few seconds at disconnect) DCD Off at disconnect then On, DSR complies with the ITU-T recommendations, CTS On...
  • Page 122 AT Commands *E n Enable Remote Access Disables remote access. Enables remote access. Determines how the modem responds to a request for remote access. Remote access is available only during a normal connection or during an MNP reliable connection without data compression. NOTE The modem does not support remote access during LAPM reliable connections.
  • Page 123 AT Commands \E n Data Echo Does not echo data sent by the local computer. Echoes data sent by the local computer. When operating in connect state, determines whether the modem echoes characters sent from the local computer. \E1 functions only during normal mode connections. %F n V.23 Mode Allows multi-protocol answering;...
  • Page 124 AT Commands NOTES • The connect message displayed when a V.23 half-duplex connection is established is CONNECT V.23 HDX. • The connect message displayed when a V.23 split-speed connection is established is CONNECT V.23. • When the originating modem is set to normal mode, you must send a few characters to the answer modem before the modem can fall back to a V.23 half- duplex connection.
  • Page 125 AT Commands NOTES • If a direct connection results, the computer must be set to split speed to match the modem speeds. • All V.23 connections are available only for direct and normal connections. &F Restore Factory Defaults First restores the factory default settings and, if Bank 2, Switch 5 is up, sets the options selected by the configuration switches.
  • Page 126 AT Commands %G n Independent Serial Port/Modem Port Speed Serial port speed determines modem port speed. %B command determines modem port speed. Determines whether the modem port speed updates to match the serial port speed with each AT command. When %G1 is set, the modem port speed does not update, and you must change it with a %B or %Fn command.
  • Page 127 AT Commands Protocol When %F0 is set: Issue %G1: Issue %G0: V.34 (26400 bps) at 26400 bps %B26400 V.34 (28800 bps) at 28800 bps %B28800 NOTE For the modem to achieve the highest possible throughput available, set the modem port speed by typing AT%G1%Bn (where n equals the desired speed). &G n Guard Tone &G0 Disables guard tone.
  • Page 128 AT Commands \G n Modem Port Flow Control Disables modem port flow control. Sets modem port flow control to XON/XOFF. Sets modem port flow control to unidirectional XON/XOFF. Sets the flow control method used to pace data between modems during a normal mode connection.
  • Page 129 AT Commands )H n Automatic Dial Connection Restoral Timer Where n is an integer from 0 to 255 minutes (Default is 0 (disabled)). When a connection fails, specifies how long the local modem tries to re-establish the physical data link with the remote modem. It also specifies how long the remote modem waits for the local modem to re-establish the link.
  • Page 130 AT Commands \H n Hewlett Packard ENQ/ACK HP ENQ/ACK protocol disabled. HP ENQ/ACK protocol enabled during MNP reliable link; modem emulates terminal. HP ENQ/ACK protocol enabled during MNP reliable link; modem emulates host. Hewlett Packard ENQ/ACK support allows the modem to emulate the ENQ/ACK protocol when an MNP reliable link is established.
  • Page 131 AT Commands $I Display Dial Access Security Database Allows the security administrator to display the Dial Access Security database. %I n Edit Connection Security Password (Asynchronous Mode) Edit Connection Security password n, where n = 0 to 49. (Default is no password.) Allows the security administrator to set a new password or change the existing password.
  • Page 132 AT Commands Default sequence 5 is: D2A20’ Connection Password:’ P2 ’^M^J’Z Where: Means: D2A20 ’Connection send the string Connection Password: to the remote user Password:’P2 and wait for a string containing the user’s password. Echo periods to the remote user. If a string is not received within 20 seconds, abort and disconnect.
  • Page 133 AT Commands *I Modem Identifier Sets the modem identifier that displays as part of the remote access session banner. You can also display the identifier with the \S command. When you enter the *I command, the ID: prompt appears. The identifier can consist of up to 25 ASCII characters. It truncates after the twenty- fifth character.
  • Page 134 AT Commands \J n Bps Rate Adjust Disables the bps rate adjustment feature. Enables the bps rate adjustment feature. After establishing a connection with \J1 set, the modem automatically adjusts its serial port speed to match the connection’s speed until that connection terminates. If your computer does not automatically change to the adjusted bps rate, you must manually change the bps rate to the new setting.
  • Page 135 AT Commands -K n MNP Extended Services Disables MNP Extended Services. Enables MNP Extended Services. Enables MNP Extended Services without MNP indication during the answer detect phase. MNP Extended Services allow two modems that support them to use MNP data services that are not available with LAPM.
  • Page 136 AT Commands The following table illustrates the \Kn command. Command Local DTE Local DTE Local modem Remote sends Break sends \B n ; sends Break modem during reliable local modem during Direct sends or normal in command connection Break connection mode, during during reliable or...
  • Page 137 AT Commands $L n Logon Sequence Edit logon sequence n, where n = 1-9. Allows you to edit logon sequences to be used during normal or reliable connections in either originate mode or auto-answer mode. If a Security Database password has been set, you must enter the correct password before you can edit a logon sequence.
  • Page 138 AT Commands Modem Setting Answering Modem Mode Setting V.22[b] V.22[a] V.22bis V.32 V.32bis V.34 Originating Modem V.23[a] (xmt 75) V.23[b] V.23[b] V.23[b] V.23[b] V.23[b] V.23[b] (xmt 1200) V.23[c] (half- V.23[c] V.23[c] V.23[c] V.23[c] V.23[c] duplex) V.21(75-300) V.21 V.21 V.21 V.21 V.21 Bell212A (1200) V.22[a]...
  • Page 139 AT Commands Modem Setting Answering Modem Mode Setting V.23[a] V.23[b] V.23[c] V.21 Bell212A Bell103 Originating Modem V.21(75-300) V.21 V.21 Bell212A (1200) Bell212A Bell212A Bell103 (300) Bell103 Bell103 AT Commands F-33...
  • Page 140 AT Commands To restrict the possible connections that can result, either %L0 or %L2 can be set on either the originating or answering modem. The following table shows the possible connection speeds if %L0- is set: Modem Speed Possible Connection Speed 1200 1200 2400...
  • Page 141 AT Commands $M n Connection Security Password Control The originating modem sends the Connection Security password; the answering modem does not verify the Connection Security password. The originating modem sends the Connection Security password; the answering modem verifies the Connection Security password for all connections. If the originator’s password does not match one of the answerer’s passwords, the connection fails.
  • Page 142 AT Commands During LAPM V.42bis connections when -M1 is set, the connection message is CONNECT LAPM/V42BIS. During LAPM connections with no compression active, the message is CONNECT LAPM. When -M1 is set, the message during normal and direct connections is CONNECT. The modem ignores this command with short-form result codes enabled by V0.
  • Page 143 AT Commands Normal mode (\N0) can communicate with nearly any modem. Error correction does not take place in normal mode. Direct mode (\N1) does not buffer data and ignores flow control. Also, in connect state, the serial port always adjusts to the speed of the connection, regardless of the setting of \Jn.
  • Page 144 AT Commands NOTE If both modems are set to auto-reliable mode, a normal connection or no connection could result due to noise on the telephone line. LAPM reliable mode (\N4) uses the LAPM reliable link to provide error detection and automatic retransmission of data if an error occurs.
  • Page 145 AT Commands Originating Modem Answering Modem normal direct/normal normal normal normal/ direct normal/ normal/ direct direct direct normal direct/normal LAPM LAPM LAPM LAPM LAPM LAPM LAPM LAPM normal direct/normal LAPM LAPM LAPM LAPM LAPM LAPM LAPM LAPM NOTE The modem does not support LAPM error correction for Bell 103, V.21, and V.23 connections.
  • Page 146 AT Commands NOTE Issuing ATO1 during a remote access session returns ERROR. $O n Originate/Answer Control Determines whether originate or answer mode as set by the O/A button. Disables O/A button and forces originate mode. Disables O/A button and forces answer mode. The modem reads the O/A button to determine whether to operate in originate or answer mode when: •...
  • Page 147 AT Commands -O n Serial Port Parity 7 data bits, odd parity. 7 data bits, even parity. 7 data bits, mark parity. 7 data bits, space parity. 8 data bits, no parity. 8 data bits, odd parity. 8 data bits, even parity. 8 data bits, mark parity.
  • Page 148 AT Commands The following prompts appear when you issue the $P command: Prompt: Response: OLD PASSWORD: Type the existing password for verification. Press Enter. If a password has not been set, just press Enter. NEW PASSWORD: Type a new password and press Enter NEW PASSWORD: For verification, type the new password and press Enter again.
  • Page 149 AT Commands &P n Dial Pulse Ratio &P0 Make = 39%, Break = 61%. &P1 Make = 33%, Break = 67%. Controls the ratio of the off-hook (make) to on-hook (break) interval that the modem uses for pulse dialing. *P n Remote Access Passwords Sets Level 0 remote access password.
  • Page 150 AT Commands -P n Check Parity Ignores parity of special characters. Processes special characters only if their parity matches that of the serial port. Processes special characters only if their parity matches that of the serial port. Recognizes modem port flow-control characters, however, regardless of whether their parity matches the serial port parity.
  • Page 151 AT Commands *Q Recover Remote Access Configuration Discards configuration changes you made during a Level 1 remote-access session but did not save with an *U. The *Q or *U commands do not affect commands that configure remote-access operation or telephone numbers that you added or changed. NOTE When you modify stored telephone numbers during a remote-access session, your changes take effect immediately.
  • Page 152 AT Commands \Q n Serial Port Flow Control Disables flow control. Enables bi-directional XON/XOFF flow control. Enables unidirectional hardware flow control; the modem uses CTS to control the terminal. Enables bi-directional hardware flow control. Enables unidirectional XON/XOFF flow control. Keeps CTS Off until connection for unidirectional hardware flow control Keeps CTS Off until connection for bi-directional hardware flow control;...
  • Page 153 AT Commands \Q4: Enables unidirectional XON/XOFF flow control. The modem serial port generates, but does not respond to, XON/XOFF flow control characters. This setting allows for computers to transmit data that has XON and XOFF data characters. The computer can still be set to respond to XON/XOFF flow control characters sent to it from the modem during serial port flow control.
  • Page 154 AT Commands *R n Enable Remote Access Security Disables remote access security. Enables remote access security. Control remote access security. With remote access security on and passwords set, password entry determines whether the modem grants Level 0 or Level 1 access at the start of a remote access session.
  • Page 155 AT Commands %S n Display Switch Settings Displays Bank 1 switch settings. Displays Bank 2 switch settings. Displays internal switch settings. &S n DSR Options &S0 DSR is always on. &S1 DSR complies with ITU-T recommendations. Controls the Data Set Ready (DSR) signal on the serial port. NOTE &S0 is equivalent to setting \D0.
  • Page 156 AT Commands \S Read Online Status Displays a list of modem commands and their current settings. This command also displays the active connection type, as well as the elapsed connect time and the telephone number most recently dialed. The \S command displays several screens. Press any key to move to the next screen. To cancel the display, type the line-delete character –...
  • Page 157 AT Commands &T6: Instructs the remote modem to initiate a Remote Digital Loopback test. This command is available only when the modem is connected in normal or direct mode and set to 1200 bps or higher. &T7: Instructs the remote modem to enter a Remote Digital Loopback with Self-Test. Upon completion of the test, the modem reports errors to the local device.
  • Page 158 AT Commands %U n Clear Serial Port Speed When issued, allows the current serial port speed (19200 bps or lower) to change to another speed. Always keeps the current serial port speed. To change the serial port speed, you must enter %U1 each time you change the serial port speed.
  • Page 159 AT Commands :U n DCD Time Delay Where n is an integer from 0 to 255 representing periods of 12.5 milliseconds. Default is 0. During MI/MIC operation, sets how long the modem waits before turning on DCD (carrier detect). NOTES •...
  • Page 160 AT Commands -V Split Serial Port Speed with Multi-Protocol Auto-Answer Enables V.23 split serial port speed connections within the multi-protocol auto-answer feature. Disables V.23 split serial port speed connections within the multi-protocol auto- answer feature. Determines whether the serial port uses split transmit and receive speed operation when using the multi-protocol auto-answer feature.
  • Page 161 AT Commands Use \V1, \V2, \V3 or \V4 when your software supports error correction result codes. Use V0\V3 if your communications software requires Hayes-compatible connection result codes. Note that when V1 is set to select long-form result codes \V3 is equivalent to \V1.
  • Page 162 AT Commands %W n Pulse Digit Command n pulse digits dialed for each number. n+1 pulse digits dialed for each number. 10-n pulse digits dialed for each number. For pulse dialing, determines whether the modem dials each number in a dial string n pulses, n+1 pulses, or 10-n pulses.
  • Page 163 AT Commands The following table lists the remote access settings: Command Description Enable Remote Access Modem Identifier Remote Access Password Enable Remote Access Security Remote Access Attention Character The following table lists the auto-logon settings: Command Description Edit Dial Access Security Database Logon Sequence Security Database Password The following table lists other commands:...
  • Page 164 AT Commands *W n Store Complete Configuration Stores complete user profile n (where n = 0 to 3) (Default is 0). Stores all active commands and registers as well as the restricted S-registers not stored with &W. (See the &W command description.) Save telephone numbers independently with the \Pn and &Zn= commands.
  • Page 165 AT Commands NOTE The “W” dial modifier causes the modem to wait for dial tone regardless of the X setting. *X Exit Remote Access Moves remote access down one level. When you enter an *X command during a Level 1 remote access session, access moves down to Level 0. When you enter it during a Level 0 session, the remote access session terminates and the originating modem returns to connect state.
  • Page 166 AT Commands NOTE With \X0 set and XON/XOFF flow control enabled, local devices such as computers or printers may send XON and XOFF characters to the modem serial port. If the modem is already controlling the flow of data to the remote system, local flow control characters will not interfere with the connection.
  • Page 167 AT Commands &Y n Designate Default User Profile Selects user profile n (where n = 0 to 3). (Default is 0). Designates which of four user profiles loads into active configuration at power up, reset, or when DTR drops when &D3 is set. The modem saves this command immediately after you enter it;...
  • Page 168 Commands to Change or Read Registers Commands to Change or Read Registers This section explains how to change S-register and :T-register values and describes each register. Some registers control a single function. Other registers control several functions and are bit mapped. Use bit mapped registers for reading modem status only. Use commands or switches to change the modem’s settings.
  • Page 169 Register Descriptions Register Descriptions This section describes the registers in numerical order (S0 to S27 and T0 to T50). S0 Ring to Auto-Answer On Range: 0 - 255 rings Default: 1 ring (auto-answer enabled) Sets the number of rings required before the modem answers. ATS0=0 disables auto- answer.
  • Page 170 Register Descriptions S3 Carriage Return Character Range: 0 - 127, ASCII decimal Default: 13 (carriage return) Sets the character recognized as a carriage return. The carriage return terminates command lines and result codes. NOTE The modem does not store this register with &W; use *W to save it. S4 Line Feed Character Range: 0 - 127, ASCII decimal...
  • Page 171 Register Descriptions S6 Wait Before Dialing Range: 2 - 255 seconds Default: 2 seconds Sets the length of the pause after off hook before the modem dials. The modem always pauses for a minimum of two seconds, even if S6 is set less than 2. NOTES •...
  • Page 172 Register Descriptions S8 Pause Time for Dial Delay Range: 0 - 255 seconds Default: 2 seconds Sets the length of time to pause when the modem encounters the comma pause dial modifier (“,”). NOTE The modem does not store this register with &W; use *W to save it. S9 Carrier Detect Response Time Range: 0 - 255 tenths of a second...
  • Page 173 Register Descriptions S10 Delay for Hang Up After Carrier Loss Range: 0 - 255 tenths of a second Default: 60 (6 seconds) Sets the length of time the modem waits before hanging up after loss of carrier, allowing for a temporary loss. Both modems should have equal S10 values. Otherwise, disconnect occurs when the lower value is reached.
  • Page 174 Register Descriptions S12 Escape Code Guard Time and Remote Access Attention Sequence Guard Time Range: 0 - 255 (fiftieths of a second) Default: 50 (1 second) Sets the minimum “quiet” time that must be present before and after entering the three- character escape code or the remote access attention sequence.
  • Page 175 Register Descriptions S14 Bit Mapped Register Bit Position Function Decimal Value not used command echo 0 no echo 1 echo result codes 0 result codes 1 no result codes result type 0 short form 1 long form dumb mode 0 smart mode 1 dumb mode dial methods 0 tone dial...
  • Page 176 Register Descriptions Bit Position Function Decimal Value initiate remote digital 0 disabled loopback with self-test 1 enabled initiate local analog 0 disabled loopback with self-test 1 enabled not used NOTES • The modem does not support diagnostic tests in Bell 103, V.13, V.21, or V.23 modes.
  • Page 177 Register Descriptions S21 Bit Mapped Register Function Decimal Value Position Telco Jack 0 default 1 not supported 1,21 CTS/RTS synchronous 0 on hook: CTS follows RTS off hook: CTS Off until connection After connection: CTS Off in response to On-to-Off RTS transition;...
  • Page 178 Register Descriptions S22 Bit Mapped Register Bit Position Function Decimal Description Value 4,5,6 result code same as X0 options same as X1 same as X2 same as X3 same as X4 make/break ratio 39/61 33/67 F-72 AT Commands...
  • Page 179 Register Descriptions S23 Bit Mapped Register Bit Position Function Decimal Description Value Respond to Remote disabled Digital Loopback enabled 1,2,3 Serial Port Bps 0 to 300 bps 600 bps 1200 bps 2400 bps 4800 bps 9600 bps 19200 bps 38400, 57600, and 115200 bps Parity option even...
  • Page 180 Register Descriptions NOTE If you use register S23 to change the parity set automatically or set by -On, the same number of data and stop bits used before the change is retained. For example, if 8 data bits and even parity is set (-O6) and you change register S23 to odd parity, the 8 data bits and 1 parity bit are retained.
  • Page 181 Register Descriptions S27 Bit Mapped Register Bit Position Function Decimal Description Value transmission mode asynchronous mode (&M0) asynchronous/ synchronous mode (&M1) synchronous dial stored number mode (&M2) synchronous manual dial mode (&M3) leased-line leased line off operation (&L0) 2-wire leased line on (&L1 or &L3) 4-wire leased...
  • Page 182 Register Descriptions :T0= n Timer for V.22bis, V.22, and V.32 Modes During Multi-Protocol Answer Range: Where n is an integer from 0 to 255 representing tenths of a second Default: 40 (4 seconds) This command requires 1200 bps or higher operation with %F0%L1 set. Determines how long the modem attempts to establish a V.32, V.22bis, or V.22 connection before attempting to establish a V.23 split speed or V.21 connection.
  • Page 183 Register Descriptions NOTE If :T2 is set to 0, V.23 half-duplex connections are not attempted. The modem attempts to establish a connection for the length of time specified by register S7 before hanging up. :T3= n Timer for V.21 and V.23 Answer Tone Duration Range: Where n is an integer from 0 to 33 representing tenths of a second.
  • Page 184 Register Descriptions :T6= n Timer for DCD Turn On Delay Range: Where n is an integer from 0 to 255, representing milliseconds Default: 200 milliseconds (2 tenths of a second) This command takes effect during only normal mode V.23 half-duplex connections. Sets how long the modem waits after carrier goes on before it starts looking for data.
  • Page 185 Register Descriptions :T10= n Primary XOFF Flow Control Character Range: Where n is a decimal from 0 to 255, representing an 8-bit character. Default: 13 hexadecimal (or 19 decimal) <DC3> Defines the character used for primary XOFF flow control on the modem and serial ports.
  • Page 186 Register Descriptions :T14= n Connect Message Delay Timer Range: Where n is an integer from 0 to 255, in 100 millisecond intervals. Default: Specifies how long to wait before or after a connect message before CTS, DSR, DCD go high. Use this command with @Cn (where n=0 or 1). :T15= n V.24 Control Register Range: Where n is an integer from 0 to 255 (see chart below).
  • Page 187 Register Descriptions Function Description Position Raising DTR does not force the modem off hook in leased-line mode when the modem is idle, regardless of the &D setting No synchronous clocks until connection Synchronous clocks always On (only valid in synchronous by switch) DCD LED follows connection status DCD LED always follows modem carrier when &C1 is set...
  • Page 188 Register Descriptions :T18= n Busy Out When DTR is Low Timer Range: Where n is an integer from 0 to 255 seconds Default: When DTR is low, the modem goes off hook and busies out the line after the time set by :T18 expires.
  • Page 189 Register Descriptions :T23 Bit Mapped Register Bit Position Function Decimal Description Value not used Rate negotiation at At the start of a startup V.32 connection, makes modem examine line quality and set speed accordingly disabled not used :T26 Bit Mapped Register Bit Position Function Description...
  • Page 190 Register Descriptions :T28 Bit Mapped Register Default: This register is used with the #CID=n and *T commands for the Caller Number Delivery (CND) feature. To enable the recording of the CND number, Bit 0 must be set to 1 (On). Bit Position Function Description...
  • Page 191 Register Descriptions :T42= n V.34 Connection Speed Selection Default V.34 connection speed selection Highest V.34 connection speed selection (about 2 speeds above default) Higher V.34 connection speed selection (about 1 speed above default) Default V.34 connection speed Lower V.34 connection speed (about 1 speed below default) Lowest V.34 connection speed (about 2 speeds below default) This register allows the user to change the V.34 connection speed according to line quality.
  • Page 192 Register Descriptions :T49= n Bit Mapped Register Range: Where n is an integer from 0 to 255 Default: 15 (all types auto-answer using Distinctive Ring) Controls which of four Distinctive Ring types (Type 1, Type 2, Type 3, or Type 4) automatically answers when a RING signal is received.
  • Page 193 Register Descriptions :T50= n Bit Mapped Register Range: Where n is an integer from 0 to 255 Default: 15 (all types send RING message) Controls which of four Distinctive Ring types (Type 1, Type 2, Type 3, or Type 4) sends a RING message to the host.
  • Page 195 Glossary This glossary lists terms that relate to modem operations. The following table describes each term. Term Definition Adaptive Packet Assembly The process by which MNP automatically adjusts the size of data packets based on the quality of the telephone line. When the line quality is good and there are few retransmissions, the size of the packets increases.
  • Page 196 Term Definition Attention code The AT characters tell the modem that a command follows. Auto-answer mode The state in which the modem automatically answers the telephone when it rings. Auto-reliable mode The mode in which the modem can answer calls and establish an asynchronous connection both with modems that support MNP or LAPM error correction and with modems that do not support error correction.
  • Page 197 Term Definition CCITT (Now ITU-T) International Telegraph and Telephone Consultative Committee, the former name for the international organization that decides upon recommended communication protocol standards. See also ITU-T. Carrier Detect (CD) A V.24 (EIA232) signal sent from the modem to the local computer, usually indicating that the modem has detected a carrier signal over the communications line.
  • Page 198 Term Definition Clear To Send (CTS) A V.24 (EIA232) signal sent from the modem to the local computer, usually indicating that the modem is ready to receive data from the local computer. Data compression A technique that combines duplicate characters and recodes characters based on the frequency and/or order in which they appear, to achieve increased throughput.
  • Page 199 Term Definition Dynamic Transmit Level The capability to automatically calculate Adjustment optimal transmit levels to compensate for cellular telephone signal distortion. Electronic Industries Association. Escape code A series of three consecutive characters (preceded and followed by a guard time of one second or user-selectable setting) that is sent to the modem, causing it to exit connection state and enter command state.
  • Page 200 Term Definition ITU-T V.22 The V.22 protocol is used for 1200 bps and 600 bps full-duplex connections. The version of V.22 your modem supports is Alternative B. ITU-T V.22bis The V.22bis protocol enhances V.22 by adding 2400 bps full-duplex connections. ITU-T V.23 The modem supports two V.23 modes: one- way forward channel at 1200 bps with a 75 bps...
  • Page 201 Term Definition Link Access Procedure for An HDLC error correction protocol for use Modems (LAPM) with error-correcting modems. Part of the ITU- T V.42 protocol. Local computer The computer the modem is attached to via the serial port. Local system The modem and the computer it is attached to.
  • Page 202 Term Definition Noise Unwanted signal disturbances over a communication line, such as variation in voltage or current, that can affect the integrity of data transmitted over the line or cause the loss of connection. Normal operation A standard asynchronous connection that does not use error correction, established with any V.34, V.32bis, V.32, V.23, V.22bis, V.22, V.21, Bell 212A, or Bell 103 modem.
  • Page 203 Term Definition Reliable operation An MNP or LAPM error-free connection with another MNP or LAPM modem. Remote system Any computer with which you communicate using the modem and a communications line. Result code A message the modem sends to the local computer containing information about the state of the modem.

Table of Contents