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Problem Solving A-1

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

A-2

Normal Powerup

A-4

Problem Solving Using the LEDs

A-5

Problem Solving Using the Seven-Segment Display

A-9

Troubleshooting Tips When Using Your Built-in Modems

A-11

Содержание DECserver 900MC

Страница 1: ...rver 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 doc...

Страница 2: ...t such radio frequency interference Operation of this equipment in a residential area may cause interference in which case the user at his own expense will be required to take whatever measures may be...

Страница 3: ...ssociated Documents xii Correspondence xiv Documentation Comments xiv Online Services xiv How to Order Additional Documentation xv Safety Overview xvii 1 Product Introduction Overview 1 1 Introduction...

Страница 4: ...Port Cable Overview 3 1 Introduction 3 1 In This Chapter 3 1 Signaling Standards 3 2 Setup Port Device Cabling 3 3 Connecting the Setup Port 3 4 4 Configuring the Module in a DEChub 900 Overview 4 1 I...

Страница 5: ...erties 6 3 Sending Commands to the Modem 6 7 Upgrading Modem Firmware 6 8 Changing the Country Location 6 10 7 Configuring the Modems Ports Using the Console Commands Overview 7 1 Introduction 7 1 In...

Страница 6: ...sing the LEDs A 5 Problem Solving Using the Seven Segment Display A 9 Troubleshooting Tips When Using Your Built in Modems A 11 B Connector and Cable Assignments Overview B 1 Introduction B 1 In This...

Страница 7: ...ments Overview E 1 Introduction E 1 In This Appendix E 1 Regulatory Requirements E 2 Information Requested by the Telephone Company E 3 Canadian Department of Communications Requirements E 4 Canadian...

Страница 8: ...l Components 2 3 2 2 Back Panel Components 2 6 7 1 Country Codes 7 3 A 1 Module LED States A 2 A 2 Port State LEDs A 3 A 3 Problem Solving Using the LEDs A 5 B 1 Compatible Cables for DECserver 900MC...

Страница 9: ...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 Intended Audience...

Страница 10: ...r Manager Chapter 7 Provides information on how to configure the module s built in modems using console commands Chapter 8 Provides information on how to remove the module from the DEChub 900 MultiSwi...

Страница 11: ...indicates system output Boldface Boldface type in examples indicates user input Return Indicates that you should press the Return key Term Definition Ethernet DIGITAL s term for its product compatibil...

Страница 12: ...rack mount options and cabling DECserver Network Access Software Installation or DECserver Network Access Server Getting Started Provides information on how to install the operational software for DEC...

Страница 13: ...arVISN Product Overview Provides an overview of clearVISN an explanation of each application and descriptions of all concepts necessary to understand and use the application efficiently clearVISN Conf...

Страница 14: ...locate product specific information refer to the following online services BBS To read the Bulletin Board System set your modem to 8 bits no parity 1 stop bit and dial 508 486 5777 U S WWW The Digita...

Страница 15: ...TAL By Mail USA and Puerto Rico DIGITAL EQUIPMENT CORPORATION P O Box CS2008 Nashua New Hampshire 03061 Place prepaid orders from Puerto Rico with the local Digital subsidiary 809 754 7575 By Mail Can...

Страница 16: ...xvi...

Страница 17: ...en die beachtet werden m ssen um den Benutzer vor Schaden zu bewahren ACHTUNG Enth lt Informationen die beachtet werden m ssen um die Gerate vor Schaden zu bewahren DANGER Signale les informations des...

Страница 18: ...m Vorgang werden alle Konfigurationseinstellungen gel scht und die Werkseinstellungen wieder eingesetzt Alle Konfigurationsdaten gehen verloren ATTENTION Cette action supprime tous les param tres de c...

Страница 19: ...Introduction 1 1 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 1 2 Feat...

Страница 20: ...tion The DECserver 900MC contains one serial port and eight modem ports Each modem port is equipped with a built in Microcom DeskPorte Fast modem Each DeskPorte Fast modem provides the following featu...

Страница 21: ...y with Digital s clearVISN MultiChassis Manager application Protocols and Standards The module supports the following protocols and standards Compatibility with the proposed ITU T V 34 protocol 14400...

Страница 22: ...automatically answer incoming calls using various modulation protocols Trellis coded modulation for forward error correction Near and far end echo cancellation Preset factory configuration switches f...

Страница 23: ...ction 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 Th...

Страница 24: ...ling the Module 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 t...

Страница 25: ...4 Network Activity LED Flashes or remains on depending on network activity 5 Seven Segment Display Provides error and status information regarding testing loading and power conditions see Appendix A P...

Страница 26: ...ronous device The serial port connector is known as the console port and referred to as Port 9 by the software 10 Modem Port Connectors 8 pin MJ Connects the built in modem to a two wire telephone lin...

Страница 27: ...Installing the Module 2 5 Module Components Figure 2 1 Front Panel LEDs and Connector 1 2 3 4 5 6 7 8 Ethernet DECserver 900MC 1 2 3 4 5 6 7 8 NPB 0692 96F 1 2 3 4 6 5 7 8 10 9...

Страница 28: ...t Provides a chassis grounding connection to the module when the module is installed into a DEChub 900 MultiSwitch or a DEChub ONE docking station 4 Manufacturing label Lists the module s part number...

Страница 29: ...Installing the Module 2 7 Module Components Figure 2 2 Back Panel Features...

Страница 30: ...stall 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 display Figure 2 3 If any of the modul...

Страница 31: ...2 4 Seating the Module Step Action 1 Place the module s mounting tab 1 into a mounting slot on the DEChub 900 MultiSwitch 2 Pull up on the release lever 2 to its unlocked position 3 Pivot the module o...

Страница 32: ...cations of the module s LEDs refer to Figure 2 1 Verify that the module s Power LED and the Module OK LED light within 1 minute The LEDs light in the following stages NOTE If the LEDs do not operate a...

Страница 33: ...ector and Cable Assignments To connect the port cables to the module complete the following steps Figure 2 5 Connecting the Cable NOTE The DECserver 900MC does not support the out of band management O...

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Страница 35: ...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 3 2...

Страница 36: ...s 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 set...

Страница 37: ...rminal or personal computer Use the following cables and adapters to connect the setup port to a setup port device 1 xx indicates cable length in meters If the setup port device is Use this cable With...

Страница 38: ...onnect a personal computer or a terminal 3 to the setup port 2 on the DEChub 900 MultiSwitch complete the following steps Step Action 1 Ensure that the transmit and receive baud rates on the setup por...

Страница 39: ...ting the Setup Port Figure 3 1 Setup Port Cabling Components The following legend identifies the setup port cabling Item Description 1 OBM Port 2 Setup Port 3 Setup Port Device BN24H H8571 J H8575 A 2...

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Страница 41: ...how to configure your DECserver 900MC when it resides in a DEChub 900 MultiSwitch In this Chapter Topic Page DEChub 900 MultiSwitch INSTALLATION MENU 4 2 5 Start Redirect Mode 4 3 Using Menus to Conf...

Страница 42: ...ess 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 Multi...

Страница 43: ...DEChub 900 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...

Страница 44: ...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 t...

Страница 45: ...AUTION This action deletes all configured settings and replaces them with factory default values All configuration settings will be lost NOTE Allow approximately 3 to 5 minutes for the module to reboo...

Страница 46: ...nfiguration storage parameters at their current values NOTE Allow approximately 1 minute for the module to restart The following example shows the dialog associated with this option Enter selection 2...

Страница 47: ...ollowing example shows the display associated with this option Enter selection 3 DECserver 900MC Network Access SW V2 1 HW V1 4 RO V6 4 0 SW BL11 LAT V5 1 LOAD IMAGE WWENG2 SysUpTime 00 49 59 0 resets...

Страница 48: ...he dialog associated with this option The following pages describe the IP Configuration options Topic Page 1 Set SNMP Read Write Community 4 9 2 Set In Band Interface IP Address 4 10 Enter selection 4...

Страница 49: ...ction 1 DECserver 900MC SET SMNP READ WRITE COMMUNITY Format The format for a community name is a string consisting of 4 to 31 printable ASCII characters that describes the relationship between an SNM...

Страница 50: ...for SNMP communications with management stations located on the same subnet as the module The factory default setting is no in band address The following example shows the dialog associated with this...

Страница 51: ...uction 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 Cha...

Страница 52: ...The Flash RAM card is keyed and cannot be inserted improperly To insert the Flash RAM card complete the following steps Figure 5 1 Inserting the Flash RAM Card Step Action 1 Locate the Flash RAM slot...

Страница 53: ...al 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...

Страница 54: ......

Страница 55: ...e modem properties update the modem firmware and send commands manually to the modem You can perform many of these Access Server Manager functions using the DECserver Network Access Software console c...

Страница 56: ...ayed click on New 2 Enter the DECserver 900MC s Internet address or select it from the drop down list if you entered the address into the NetRider BootP Loader database 3 Enter a name for the DECserve...

Страница 57: ...Command page to manually send commands to one or more modems Use the Firmware page to upgrade the modem firmware Use the Country page to set the country location for the modem Setting Modem Propertie...

Страница 58: ...he Modem Ports Using the Access Server Manager 3 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...

Страница 59: ...ses 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 Flow Control check use flow control and select hardwar...

Страница 60: ...in order for the modem to accept commands and causes the modem to hang up if the DTR is not present Save configuration Tells the modem to save the modem settings to a user profile commonly referred t...

Страница 61: ...eps Step Action 1 Select the access server from the Access Server Manager Browser and click on Open 2 From the Configuration page a Click on Modems b Click on Configure 3 Click on the Command tab in t...

Страница 62: ...learing the Status Box Click on Clear to delete any messages that appear in the Status box 7 Click on Close when finished Step Action 1 Insert the Modem firmware diskette into a diskette drive or copy...

Страница 63: ...omplete a firmware upgrade This means it may take 48 60 minutes to upgrade all eight ports 5 From the drop down list select the port whose firmware you want to upgrade or click on Select All to send u...

Страница 64: ...the 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 com...

Страница 65: ...Configuring the Modem 4 From the drop down list select the country where you are using the DECserver 900MC access server 5 Click on Set Country Now 6 Click on Close Note The DECserver 900MC must be r...

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Страница 67: ...on to configure the DECserver 900MC modems see Chapter 6 Configuring the Modem Ports Using the Access Server Manager However you can perform some functions using the DECserver Network Access Software...

Страница 68: ...y all of the valid country codes and the current country location setting Setting the Country Code Before connecting the modem to a telephone line set the country code for the country in which the DEC...

Страница 69: ...odes Country Code Country Code Australia 20 Japan 13 Austria 22 Netherlands 5 Belgium 23 New Zealand 11 Czech Republic 18 Norway 8 Denmark 10 Poland 19 Finland 9 South Africa 16 France 25 Spain 6 Germ...

Страница 70: ...stics to the factory defaults use the following command LOGOUT PORT port list FACTORY Example This example shows how to log out ports 2 through 8 and reset the port characteristics to their factory de...

Страница 71: ...erence manual Example This example shows how to establish a service on modem port 1 called modems connect to the service and enter a modem command The modem responds with OK indicating it is ready to...

Страница 72: ......

Страница 73: ...oduction 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...

Страница 74: ...ng the Module 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 Et he rn et DECserver 9...

Страница 75: ...hub 900 complete the following steps Figure 8 2 Unseating the Module Step Action 1 Hold the module and lift the release lever 1 located at the top of the DEChub 900 slot 2 While holding up the release...

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Страница 77: ...ions and provides problem solving information The sections of this appendix are listed below In This Appendix Topic Page LED Descriptions A 2 Normal Powerup A 4 Problem Solving Using the LEDs A 5 Prob...

Страница 78: ...rk Table A 1 shows the states that are possible for each of the module s LEDs Table A 1 Module LED States LED Name ICONS Off On Flashing Power No power to module Module receiving power Faulty power co...

Страница 79: ...Off Orange Green Port State Module is online but the built in modem on the port is not in use Note The term online refers to the module operatingwith the DECserver Network Access Software code Port i...

Страница 80: ...nge All other LEDs light and then turn off This verifies that the individual LEDs are operational 2 The module initiates its built in self test The seven segment display indicates the self test status...

Страница 81: ...DEChub 900 power LED is off the cause of the problem is the DEChub 900 power supply See the troubleshooting procedures in the DEChub 900 MultiSwitch Owner s Manual If the DEChub power LED is on and th...

Страница 82: ...e lever momentarily to repeat the self test If self test fails again replace the module Module OK LED is flashing Non fatal error See the error message on the console port Fan is faulty Call your DIGI...

Страница 83: ...ED blinks momentarily during the LED powerup self test The module or another unit in the DEChub may not be connected to an active segment Connect a known active segment to any unit in the DEChub If th...

Страница 84: ...rver 900MC Reload the DECserver 900MC with Version 2 1 or later of the DECserver Network Access Software After correctly installing the module on a DEChub 900 the information display does not read DEC...

Страница 85: ...NOTES When the display codes are rotating the DECserver 900MC is receiving power The rotating code is referred to as the race track pattern When the display codes are off the DECserver 900MC is not re...

Страница 86: ...al testing SIM 1 testing SIM 2 testing Internal testing Network interface external testing Software is loading from Flash RAM or is updating Flash RAM Server is requesting software from network Attemp...

Страница 87: ...ighest mutually supported speed is the maximum connect speed possible Modem does not dial out Ensure the telephone cable connections are secure If the software displays NO DIALTONE enter the ATX3 comm...

Страница 88: ...our connection succeeds the problem is the quality of your phone lines If your file transfer rate is slow experiment with the Cn command for different forms of data compression Certain types of files...

Страница 89: ...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 po...

Страница 90: ...ed modems to the DECserver 900MC console port H8585 AB MJ8 to DB25 male modem adapter Use this adapter with the BN25G cable to connect low speed modems to the DECserver 900MC console port H8585 AA MJ8...

Страница 91: ...s indicated in Table B 2 Figure B 1 8 Pin MJ Description for Console Port 1 To change default values refer to the Network Access Server Management manual Table B 2 DECserver 900MC Console Port Pin Ass...

Страница 92: ...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 Figure B 2 8 Pin MJ...

Страница 93: ...ix C Product Specifications Overview Introduction This appendix lists the specifications and available parts for the DECserver 900MC In This Appendix Topic Page Product Specifications C 2 Acoustical S...

Страница 94: ...ronment Operating Temperature1 5 C to 50 C 41 F to 122 F Relative Humidity 10 to 95 noncondensing Altitude Operating Non operating Sea level to 2400 m 8 000 ft Sea level to 4900 m 16 000 ft Power 25 6...

Страница 95: ...Equipment Corporation representatives 1 B 10 dBA 1 Aktuelle Werte f r spezielle Ausr stungsstufen sind ber die Digital Equipment Vertretungen erh ltlich 1 B 10 dBA Table C 2 Acoustics Declared values...

Страница 96: ...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 9 DEChub ONE 15 pin D Sub AUI Connector 1 DEC...

Страница 97: ...ndix 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...

Страница 98: ...tiation attempts when configured for auto reliable mode Uses Dynamic Transmit Level Adjustment to automatically calculate optimal transmit levels to compensate for cellular telephone signal distortion...

Страница 99: ...crocom SX 2400 modems operating at Class 3 service transmits data at 2600 bps MNP Class 4 Uses synchronous framing techniques plus improvements developed by Microcom Adaptive Packet Assembly and Optim...

Страница 100: ...throughput resulting in error free transmission over 2 wire dial up or leased lines at effective throughputs as high as 11000 bps on the AX 9600 Plus and 19200 bps on the AX 9624c with data compressio...

Страница 101: ...irements Overview Introduction This appendix contains information on regulatory requirements In This Appendix Topic Page Regulatory Requirements E 2 Information Requested by the Telephone Company E 3...

Страница 102: ...use damage to the telephone network If this device is not functioning properly disconnect it until the problem has been fixed Otherwise the telephone company may temporarily disconnect service Repair...

Страница 103: ...which the device is connected Ringer equivalence number REN found on the FCC sticker attached to the device The REN determines the number of devices which may be connected to the same telephone number...

Страница 104: ...ns may not prevent degradation of service in some situations Repairs to certified equipment should be made by an authorized Canadian maintenance facility designated by the supplier Any repairs or alte...

Страница 105: ...issions from digital apparatus set out in the Radio Interference Regulations of the Canadian Department of Communications Le pr sent appareil num rique n met pas de bruits radio lectriques d passant l...

Страница 106: ......

Страница 107: ...is 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 F 2 Comman...

Страница 108: ...Forces the modem to go off hook in answer mode regardless of the value of register S0 If result codes are enabled your computer displays RING long form or 2 short form when it receives a call An Auto...

Страница 109: ...settings interfere with V 42 negotiations With this command N3 C2 must also be set A Request Remote Access Initiates a request for remote access When you type AT A the requesting modem waits 10 secon...

Страница 110: ...l Port Bps Rate Where n 75 300 600 1200 2400 4800 9600 19200 38400 57600 115200 bps Sets the serial port bps rate when issued Bn Modem Port Bps Rate Where n 75 300 600 1200 2400 4800 7200 9600 12000 1...

Страница 111: ...the modem to establish a reliable connection using either MNP Class 5 Data Compression or V 42bis compression depending on the capability of the remote modem Setting this command to 1 or 2 restricts...

Страница 112: ...On before the connect message is sent Specifies whether CTS DSR and DCD go On before or after a connect message Use this command with T14 CnAuto Reliable Buffer C0 Does not buffer data during link neg...

Страница 113: ...do not have to wait for the 3 second auto reliable window to expire before data can pass NOTES When either C1 or C2 is set reliable and normal connections may result independently of bps rate adjustme...

Страница 114: ...ou can use several modifiers with the same telephone number Dial modifiers include J Link Negotiation Perform link negotiation at 1200 bps for the current connection only This dial modifier is equival...

Страница 115: ...rent P or T modifier or reset the modem Also you can combine P and T dial modifiers within a dial string Example Pulse dial a local telephone number and tone dial an access code and telephone number b...

Страница 116: ...Before Dialing Inserted between characters in a dial string and causes the modem to wait for the register S7 time delay for at least one ring followed by five seconds of silence before acting on the...

Страница 117: ...n LAPM reliable mode for the current connection only Q Dial in LAPM Mode with Fallback to Normal Placed anywhere in the dial string causes the modem to override the current operating mode and dial in...

Страница 118: ...necting When carrier drops the modem attempts for n seconds to empty its receive buffer before disconnecting If its buffers are empty or if n 0 the modem disconnects without delay If a physical discon...

Страница 119: ...ate mode when DTR is raised Dn where n 1 2 or 3 must also be set D2 Modem goes off hook in originate mode and dials the first stored telephone number when either DTR is raised or the T D button is pre...

Страница 120: ...ds and follows connection status during connection Use the following table when your computer requires DSR and CTS to be Off It shows C and D settings and the result of combining the two commands C D...

Страница 121: ...ds before hanging up The TST indicator lights during auto retraining The modem can retrain during connections at 2400 bps or higher Use ATO1 to force the retrain sequence when E0 is set NOTE The modem...

Страница 122: ...the modem port during normal mode connections when N0 is set when the serial port is configured for asynchronous transmission of 11 bit characters Both modems must be set to the same number of data bi...

Страница 123: ...answering modems must be set to opposite V 23 split speed mode command settings set F1 on the modem transmitting at 75 bps and F2 on the modem transmitting at 1200 bps For example if you set your mode...

Страница 124: ...dem or a V 23 1200 1200 bps half duplex modem When F3 is set the modem can only establish normal or direct 1200 bps half duplex connections The S command shows MODEM BPS V 23 when the modem establishe...

Страница 125: ...ntrol characters on the serial port When F1 is set and primary flow control enabled on the serial port the modem sends two flow control characters one primary and one secondary to the host for flow co...

Страница 126: ...e new modem speed and Fn commands This section lists the commands to configure the modem for each modulation protocol and mode Modem connection speeds are in parentheses Protocol When F0 is set Issue...

Страница 127: ...ed Gn Guard Tone G0 Disables guard tone G1 Sets guard tone on the answering modem to 550 Hz G2 Sets guard tone on the answering modem to 1800 Hz NOTE Outside the United States and Canada some phone sy...

Страница 128: ...S The reliable mode has its own method of flow control and ignores the G setting However Qn settings remain active Both modems must have the same primary flow control characters set during normal conn...

Страница 129: ...res or until a connection is reestablished NOTE Your modem will try 9 redials see the D command so do not set H greater than 2 Hn Link Negotiation Speed H0 Link negotiation occurs at the highest suppo...

Страница 130: ...NQ ACK protocol Set the modem at the host to H1 Set the modem at the terminal to H2 Enable either XON XOFF Q1 or hardware Q3 flow control on the serial port on both modems to prevent data loss Establi...

Страница 131: ...ord or edit an existing one by using the I command Passwords must contain exactly five alphanumeric characters The modem ignores upper case or lower case and parity You must type the old password corr...

Страница 132: ...sword Passwords must contain exactly five alphanumeric characters The modem ignores upper case or lower case and parity You can enter up to fifty passwords for both the originating and answering modem...

Страница 133: ...o logon sequences L1 L5 J1 Clears the Dial Access Security database restores the factory default auto logon sequences L1 L5 and clears the Connection Security Password Database Also clears stored tele...

Страница 134: ...h bps rate adjustment enabled the serial port speed adjusts to 9600 bps If the connection speed is above 14400 bps the serial port adjusts to 19200 bps If you set the serial port to the modem s highes...

Страница 135: ...Kermit or UUCP must be enabled on both the originating and answering modems You can use the Kermit and UUCP protocols only during an MNP reliable connection with or without data compression The protoc...

Страница 136: ...system1 Empty data buffers send Break to remote system Send Break to remote system set modem to command state Empty data buffers send Break to serial port K1 Empty data buffers send Break to remote sy...

Страница 137: ...to establish a connection With L3 set modem operation complies with the proposed annex to the ITU T V 32 specification for automoding when interworking with V 22bis and V 22 modems T13 defines how lon...

Страница 138: ...ell103 Bell103 Bell103 Bell103 Bell103 Modem Setting on Answering Modem Mode Setting on Originating Modem V 23 a V 23 b V 23 c V 21 Bell212A Bell103 V 34 14400 28800 V 22 a V 32bis 4800 14400 V 22 a V...

Страница 139: ...s F 33 AT Commands V 21 75 300 V 21 V 21 Bell212A 1200 Bell212A Bell212A Bell103 300 Bell103 Bell103 Modem Setting on Answering Modem Mode Setting on Originating Modem V 23 a V 23 b V 23 c V 21 Bell21...

Страница 140: ...modem speed and the connection speed are identical Modem Speed Possible Connection Speed 300 300 600 600 1200 1200 2400 1200 2400 4800 4800 7200 4800 7200 9600 4800 7200 9600 12000 4800 7200 9600 1200...

Страница 141: ...ephone site modems M1 For cell side cellular modems Forces adjustment of power level Adjusts the power levels during link negotiation for reliable connections to accommodate signaling requirements of...

Страница 142: ...tial transmit level of 10 dBm M35 Use an initial transmit level of 35 dBm Selects the initial transmition level for your connection You can set levels from 10 dBm through 35 dBm The command is structu...

Страница 143: ...ink immediately after making a connection During an MNP reliable link both modems should use flow control on the serial port When the modem detects a transmission error it holds data in a buffer attem...

Страница 144: ...eliable mode with fallback to normal mode N5 attempts to establish an LAPM reliable connection If the LAPM connection attempt fails the modem falls back to a normal connection LAPM reliable mode with...

Страница 145: ...train sequence when operating at 2400 bps or higher and then returns to connect state Type ATO1 to reduce errors due to loss of equalization when excessive bit error rates are present Originating Mode...

Страница 146: ...etermine whether to operate in originate or answer mode when you press the T D button you type AT T2 it is in leased line mode NOTE The modem saves the O value when you set it You do not have to enter...

Страница 147: ...port parity during a connection When parity is required for a connection and is different than the parity set by the AT sequence the parity must be set at the same time the dial command is issued and...

Страница 148: ...password and nnnnn equals the new password Sets a new password or changes an existing password Issue this command at least once to enable the modem s connection security operation for the first time I...

Страница 149: ...vel 0 and Level 1 passwords are set to null at the factory The following prompts appear when you issue this command Passwords must contain exactly five alphanumeric characters The modem ignores upper...

Страница 150: ...puter at 8 data bits no parity When P2 is set all received data is passed through to the computer with parity corrected to match the serial port parity NOTE The P command is used only for 10 bit data...

Страница 151: ...modem can fall back from a V 32bis or V 32 MNP reliable connection to a V 22bis MNP reliable connection at 2400 bps or a V 22 MNP reliable connection at 1200 bps Fallback may occur when poor telephon...

Страница 152: ...ontrol instructs your computer to resume transmitting data to the modem For reliable connections retransmissions can reduce the effective modem port speed If this occurs flow control prevents buffer o...

Страница 153: ...until a connection is established and ignores RTS while not connected Rn Read All Registers R0 Displays the contents of all S registers in decimal and hexadecimal integers in tabular format R1 Displa...

Страница 154: ...appears Rn Simulate Ring R0 Modem does not simulate ring or act on pulse leads R1 If DTR is low and D1 D2 or D3 is set the modem simulates ring until DTR is raised If DTR is high or if D0 is set the m...

Страница 155: ...a remote access session To request a remote access session using this character establish a connection and type the attention character four times in succession do not type a carriage return The A com...

Страница 156: ...loopback with self test T8 Local analog loopback with self test NOTE The modem does not support Tn commands for Bell 103 V 13 V 21 and V 23 modes T0 Ends a test in progress without terminating a conne...

Страница 157: ...attern and verifies these characters Upon completion of the test the modem reports errors to the local device This command is available only when the modem is in normal or direct mode and set to 1200...

Страница 158: ...nging from 11 bit characters to 10 bit characters and from 10 bit to 11 bit When the serial port speed is set to 38400 bps or higher it cannot be changed until you enter an AT U command or reset the m...

Страница 159: ...00 bps set AT U4800 The modem will only make connections at 4800 bps or higher Vn Result Code Form V0 Sends short form result codes V1 Sends long form result codes Selects whether the modem sends long...

Страница 160: ...rts this command in Dial Access Security R does not need to be set Vn Error Correction Result Code Form V0 Uses standard long form result codes CONNECT speed V1 Adds REL to long form error correction...

Страница 161: ...ns When either V3 or V4 is set the actual modem bps rate displays for 4800 7200 and 12000 bps reliable connections V Display Bootstrap Revision Requests modem to display its current flash memory boots...

Страница 162: ...or W2 set the modem dials digit 0 with 10 pulses When W1 is set digit 0 is dialed with 1 pulse Wn Store Current Configuration Stores current user profile n where n 0 to 3 Default is 0 Stores the acti...

Страница 163: ...Description E Enable Remote Access I Modem Identifier P Remote Access Password R Enable Remote Access Security S Remote Access Attention Character Command Description H Edit Dial Access Security Data...

Страница 164: ...ignals Displays CONNECT when it establishes a connection Smartmodem 300 compatible X1 Modem ignores dial tone and busy signals Sends a connect result code including bps rate when it establishes a conn...

Страница 165: ...ation sets how long the modem waits before turning on DSR Data Set Ready NOTES The X command takes effect when R1 is set If the DSR signal is already On before the connection the X command is ignored...

Страница 166: ...from the remote system before the modem is ready to receive more data resulting in a loss of data Yn Long Space Disconnect Y0 Disables long space disconnect on receipt of H T D toggle or DTR drop if D...

Страница 167: ...rity and bps rate to match the local computer Also restores commands and registers that you last saved with either the W or W command or the factory defaults if you have not entered an W or W To reset...

Страница 168: ...and used was ATS0 2 issuing AT 4 changes the value of register S0 from 2 to 4 Display the Value of the Last Referenced S Register Displays the value of the last S register referenced in a read write o...

Страница 169: ...e number of rings that occur before the modem answers a call If no ring occurs within eight seconds after the last ring the ring counter resets to 0 S2 Escape Code Character Range 0 255 ASCII decimal...

Страница 170: ...h W use W to save it S4 Line Feed Character Range 0 127 ASCII decimal Default 10 linefeed Sets the character recognized as a line feed The line feed character follows the carriage return at the end of...

Страница 171: ...modem does not store this register with W use W to save it S7 Wait for Carrier After Dial Range 0 255 seconds Default 60 seconds Sets the length of time that the modem waits for carrier from remote m...

Страница 172: ...e 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 Default 6 0 6 seconds Determines how long a signal mu...

Страница 173: ...ctions as if carrier is always present After disconnecting the modem waits for a minimum of five seconds before going off hook again in originate mode NOTES The modem does not store this register with...

Страница 174: ...emote access attention sequence must be less than this guard time If register S12 is set to 0 the time it takes to enter the escape code or remote access attention sequence does not affect recognition...

Страница 175: ...form 1 long form 4 dumb mode 0 smart mode 1 dumb mode 5 dial methods 0 tone dial 1 pulse dial 6 not used 7 originate answer 0 answer mode 1 originate mode Bit Position Function Decimal Value 0 local a...

Страница 176: ...tests at 1200 bps or higher S18 Test Timer Range 0 255 seconds Default 0 seconds disables timer Sets how long the modem conducts a loopback diagnostic test Register S18 is available only in normal or...

Страница 177: ...ransition after delay specified in S26 R0 1 on hook CTS On off hook CTS Off until connection After connection CTS On for duration of carrier signal R1 2 ITU T V 13 emulates half duplex over a full dup...

Страница 178: ...ons F 72 AT Commands S22 Bit Mapped Register Bit Position Function Decimal Value Description 4 5 6 result code 0 same as X0 options 4 same as X1 5 same as X2 6 same as X3 7 same as X4 7 make break rat...

Страница 179: ...s Bit Position Function Decimal Value Description 0 RespondtoRemote Digital Loopback 0 disabled 1 enabled 1 2 3 Serial Port Bps 0 0 to 300 bps 1 600 bps 2 1200 bps 3 2400 bps 4 4800 bps 5 9600 bps 6 1...

Страница 180: ...or M3 set the modem ignores an On to Off transition of DTR that is less than the register S25 time delay Asynchronous synchronous time delay Register S25 has two functions when M1 is set First it sets...

Страница 181: ...chronous mode M1 2 synchronous dial stored number mode M2 3 synchronous manual dial mode M3 2 3 leased line operation 0 leased line off L0 1 2 wire leased line on L1 or L3 2 4 wire leased line on L2 o...

Страница 182: ...blish a V 32 V 22bis or V 22 connection T1 determines how long the modem attempts to establish a V 23 split speed connection before attempting a V 21 or V 23 half duplex connection During this period...

Страница 183: ...the modem waits after detecting answer tone before proceeding with the connection When T3 is set to 0 the originating modem does not wait for answer tone T4 n Timer for Line Turnaround Delay Carrier O...

Страница 184: ...seconds Setting T7 0 disables this timer This command takes effect only when the modem falls back to a normal mode V 23 half duplex connection Sets the amount of time the modem waits before hanging u...

Страница 185: ...secondary XON flow control on the modem s serial port For secondary flow control to take effect you must set either F1 Q1 or F1 Q4 T12 n Secondary XOFF Flow Control Character Range Where n is a decim...

Страница 186: ...mode retrains 1 CTS is lowered during synchronous and direct mode retrains 1 0 CTS is not affected by leased line restoral or dial backup operation 1 CTS is lowered during leased line restoral or dial...

Страница 187: ...s connections Reduces the time required to establish a connection by setting T17 to a value less than 28 this increases the modem s sensitivity to noise on the line Reduces the modem s sensitivity to...

Страница 188: ...255 see below for the valid values for n Default 1 This command controls MNP link control and is used as follows T22 DSR Timer Range Where n is an integer from 0 to 255 in increments of 12 5 millisec...

Страница 189: ...At the start of a V 32 connection makes modem examine line quality and set speed accordingly 2 disabled 5 7 not used Bit Position Function Description 0 0 Enables 2 second billing delay 1 Disables 2...

Страница 190: ...sition Function Description 0 0 does not record CND number or display CND message in S report 1 records CND number and displays CND message in S report 1 0 disables Alternate CND message format 1 enab...

Страница 191: ...lt V 34 connection speed 4 Lower V 34 connection speed about 1 speed below default 5 Lowest V 34 connection speed about 2 speeds below default This register allows the user to change the V 34 connecti...

Страница 192: ...ve 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 See also register T50 Bit Position Function Description 0 0 Ty...

Страница 193: ...NG message to the host Also lets you optionally send a unique message RING1 RING2 RING3 RING4 to further identify which line is receiving the RING signal See also register T49 Bit Position Function De...

Страница 194: ......

Страница 195: ...nel Enhancements ACE Optimizes performance of the modem when operating under poor line quality conditions Analog transmission Transmission method by which data is sent as a continuous range of changes...

Страница 196: ...digital loop 1A and analog V 54 loop 3 loopbacks LAPM connections Bell 212A Bell 212A protocol is for 1200 bps full duplex connections Bps rate The rate at which information is sent A unit of measure...

Страница 197: ...side or central site Command response The OK response character that is sent to your terminal or computer to indicate the modem is ready to enter AT mode commands Command state The state the modem is...

Страница 198: ...ectrical current that represents a 0 or 1 data bit Computers and terminals use digital transmission Distinctive Ring A service available from some telephone companies that allows the detection of four...

Страница 199: ...nsmitted in two directions simultaneously Guard time An interval of time that must be present before the first character and after the last character of the escape code in order for the modem to recog...

Страница 200: ...odulation ITU T V 32bis An MNP or LAPM error free asynchronous connection at 14400 12000 9600 7200 or 4800 bps with another modem that supports MNP or LAPM The ITU T V 32bis specification enhances V 3...

Страница 201: ...hecking and correction Modem MOdulator DEModulator A device that permits a computer to communicate with other computers or terminals over analog telephone lines The local modem converts digital input...

Страница 202: ...e system Optimized Data Phase Redesign of the MNP protocol header which reduces the number of overhead bytes per data packet Originate modem The modem that emits carrier in response to answer tone fro...

Страница 203: ...usually indicating that the computer is ready to begin sending data to the modem Serial port The port through which digital signals are exchanged between the modem and the local computer Smart mode T...

Страница 204: ......

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Digital Equipment DECserver 900MC, Руководство по установке и настройке

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