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ROUBLESHOOTING AND

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The introductory screen of the 3Com BBS will
look like the screen shot below. The BBS
gives you access to customer and technical
support documents and the BBS library. The
library contains hundreds of helpful files and
tips to help simplify using your modem.

When you are ready to leave the BBS, type

G

(for “good-bye”) from the main menu.

3Com offers a number of other online technical
support options. Choose any one of the
following options for help with and/or more
information on your new modem.

Internet FTP

Provides free library containing the same files
as the BBS site. FTP to

ftp.usr.com.

Internet on Demand

Provides automatic technical support through a
library containing product information, quick
reference cards, and installation help. To
obtain an index of available documents, send a
blank e-mail to

[email protected]

. To have a

specific document e-mailed to you, send the
document's number in the subject field.

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Содержание 005683-00 -

Страница 1: ...spective owners 1998 3Com Corporation 7770 North Frontage Road Skokie IL 60077 2690 All Rights Reserved IMPORTANT In accordance with the ITU T standard for 56K transmissions this modem is capable of 56 Kbps downloads However due to FCC rules which restrict power output of the service providers modems current download speeds are limited to 53 Kbps Actual speeds may vary depending on line conditions...

Страница 2: ... Prepare For Plug and Play 14 Checking Your Version of Windows 95 14 Checking Your System s Resources 16 How to Insert the Modem 17 Installing the Winmodem Software in Windows 950a 21 Installing the Winmodem Software in Windows 950b 22 Un Installing the Winmodem Software in Windows 26 Software Installation and Testing 29 Software Installation and Registration Using the Update Wizard 29 Starting th...

Страница 3: ...Starting Modem Station 37 Using Detect New Modems 39 Using Terminal 40 Using Modem Configurator 43 Using Modem to Computer 46 Using the Extended Information Screens 50 U S Robotics Update Wizard 56 Installing the Wizard 57 Updating Your Modem 57 Troubleshooting and Online Help Resources 58 Problems and Solutions 58 Online Help Resources 69 Are You Still Having Problems 72 If You Need to Return the...

Страница 4: ...on 88 Manufacturer s Declaration of Conformity 88 Caution to the User 89 Canada IC 89 UL Listing CUL Listing 89 Connecting to the Telephone Company 90 Fax Branding 90 Radio and Television Interference 91 For Canadian Modem Users 92 Limited Warranty 95 ...

Страница 5: ...ology or x2 technology This modem will give you the most compatibility with high speed downloads from service providers that offer the ITU 56K standard technology or x2 technology to their customers 3Com is working with providers everywhere to quickly upgrade their service to the ITU 56K standard Capable of receiving up to 56 Kbps and sending up to 31 2 Kbps Due to FCC regulations receiving speeds...

Страница 6: ...ards EIA 578 Class 1 FAX EIA 592 Class 2 0 FAX Front Channel Link Rates 28000 29333 30666 32000 33333 34666 36000 37333 38666 40000 41333 42666 44000 45333 46666 48000 49333 50666 52000 53333 54666 56000 57333 Back Channel Link Rates 4800 7200 9600 12000 14400 16800 19200 21600 24000 26400 28800 31200 33600 V 34 Link Rates 4800 7200 9600 12000 14400 16800 19200 21600 24000 26400 28800 31200 33600 ...

Страница 7: ... the accompanying software under Windows 3 x These instructions are for users of either Windows 3 1 Windows 3 11 or Windows for Workgroups You ll need these items from your U S Robotics modem box the modem a phone cord Connections CD Winmodem disk Installation Guide Plus a screwdriver not included ...

Страница 8: ...our PC How to Insert the Modem NOTE Before installing your modem write down its serial number You ll find the serial number underneath the bar code on the white sticker on the modem and on the outside of the box the modem came in If you ever need to call our customer support department a customer support representative will ask you for the serial number This will help him or her identify your mode...

Страница 9: ...uter may look different from the drawing on the right but the basic principle for removing the cover should be the same Refer to your computer manufacturer s manual if you need further instructions 4 Find an empty ISA expansion slot at least as long as the gold edge of your modem ISA slots have black plastic grooves lined with silver metal Unscrew and remove the expansion slot cover the long narro...

Страница 10: ...ure to seat the modem properly Sometimes a gentle back and forth motion helps get the modem all the way into the slot If you feel resistance the modem may not be properly lined up with the slot Do not force it Take the modem all the way out and try again 6 Once the modem is seated secure it using the screw you removed in step 3 7 Put the computer s cover back on and replace the screws 8 If you cur...

Страница 11: ...e 10 Plug the other end of the cable into the wall jack 11 If you want to use a telephone on the same line as the modem plug the telephone s cable into the modem s PHONE jack 12 Plug the power cords cables and peripherals back into the computer and turn the computer on 13 If Windows does not start automatically please start it now Modem Initialization Your Winmodem came with a diskette that contai...

Страница 12: ...on diskette 2 Click on Program Manager Now click File and select Run In the Command Line text box type a install exe Click OK 3 The next screen will tell you where the Winmodem installation files will be located Click Continue to copy the Winmodem files to this directory If you wish to copy the Winmodem files to a different directory type the path to that directory in the Install to text box ...

Страница 13: ...k Yes 5 This screen lets you know the installation software is being loaded to your hard drive Let it finish 6 This screen tells you that modifications have been made to your Windows system files Click OK 7 This screen tells you that the software will automatically detect available communications ports for the Winmodem Click OK ...

Страница 14: ...one for the Winmodem Highlight the first or lowest one and then click OK Be sure to write the number of the free COM port you select See the troubleshooting section of this manual if the software does not locate an available COM port 9 Your Winmodem software has been installed Click Restart Windows to finish the process ...

Страница 15: ...a new Winmodem group you will instead see the Configuration screen You will have to choose an available I O address and an available IRQ Do not select Let plug and play configure For the I O address Choose any on the list For the IRQ The COM port IRQ combinations shown here work with most computer set ups COM IRQ 1 4 2 3 3 5 7 or 9 4 5 7 or 9 ...

Страница 16: ... O address you will get an error message Choose another I O address in the Configuration dialog box that appears If you chose an unavailable IRQ you may encounter problems when your communications software program tells you it cannot find the modem At that point choose another IRQ in the Configuration dialog box You can find it by clicking the Configurator icon in the Winmodem group in the Program...

Страница 17: ...hen click Control Panel 2 Double click the System icon 3 When the System Properties screen appears click the Device Manager tab 4 Double click Computer and the Computer Properties screen appears Select the option at the top of the screen to show Interrupt Requests IRQs You will see the IRQs your system is currently using If IRQs 3 4 5 and 7 are being used you need to free an IRQ before you begin i...

Страница 18: ...crewdriver not included NOTE These instructions are for Windows 95 users Windows 3 x users should go to the Windows 3 x Installation section of this manual on page 3 How to Prepare for Plug and Play Installation Checking Your Version of Windows 95 To install your Winmodem properly you must first know which version of Windows 95 you have Please follow these instructions to check ...

Страница 19: ... Windows 2 Select Properties 3 Find your version number in the upper right corner of the General screen shown below In this example the Windows version is 950a Make a note of the version you are have You will follow different instructions later depending on which version you have ...

Страница 20: ... Settings and then click Control Panel 2 Double click the System icon 3 When the System Properties screen appears click the Device Manager tab 4 Double click Computer and the Computer Properties screen appears 5 Select the Interrupt request IRQ option at the top of the screen You will see the IRQs your system is currently using If IRQs 3 4 5 and 7 are being used you need to free an IRQ before you ...

Страница 21: ...ug it from the electrical outlet 3 Unplug any peripheral devices printer monitor keyboard mouse etc from the computer TIP Before you unplug anything label the cords or make a sketch of how things are connected This can be helpful when you plug things back in later CAUTION To avoid risk of electric shock make sure your computer and all peripheral devices are turned off and unplugged from electrical...

Страница 22: ...w and remove the expansion slot cover the long narrow piece of metal that keeps dust from entering through the opening that s perpendicular to the slot Be careful not to drop the screw into the computer you will need it later to screw the modem into place 6 Holding the modem by each corner align the gold edge with an empty expansion slot Push down gently until the modem snaps into the slot ...

Страница 23: ...feel resistance the modem may not be properly lined up with the slot Do not force it Take the modem all the way out and try again 7 Once the modem is in the slot secure it using the screw you removed in step 5 8 Put the computer s cover back on and replace the screws 9 Locate the wall jack you plan to use for the modem If you have a phone plugged into this jack disconnect the phone s cord from the...

Страница 24: ...ou use must be an ANALOG phone line the type found in most homes Many office buildings have digital phone lines Be sure you know which type of line you have The modem will be damaged if you use a digital phone line 13 Once Windows starts you will see a series of screens indicating new hardware has been installed At this point you will install Winmodem software If you have Windows 95 version 950b g...

Страница 25: ...lready selected select it now Click OK to continue 2 When you see this screen insert the Winmodem floppy disk which came with your Winmodem and click OK 3 You will see a screen confirming that you are installing a Winmodem When the screen finishes building your drivers remove the Winmodem disk The screen shown on the next screen tells you which COM port your Winmodem has been installed ...

Страница 26: ...of this manual You are now ready to install the Connections CD ROM included with your Winmodem Go to Software Installation and Testing on page 29 for instructions on installing the Connections CD and trying out your modem by registering online Installing the Winmodem Software in Windows 950b 1 When you see this screen after Windows starts DO NOT click anything DO NOT press ENTER Instead insert you...

Страница 27: ...WINMODEM INSTALLATION UNDER WINDOWS 95 23 2 Then click Next to continue 3 When you see this screen click Finish ...

Страница 28: ...If you see the screen below instead of the screen preceding click the Back button 4 When you see this screen click OK 5 When you see this screen type A Be sure to type the period after the backslash to replace whatever is in the Copy files from box ...

Страница 29: ... will see a series of screens as files copy and drivers build 7 Finally you will see a screen telling you that the modem has been installed Click OK 8 Check the installation by going into the Control Panel 9 Double click the Modem icon circled in the screen below ...

Страница 30: ... this screen Click OK 11 For instructions on how to install the RapidComm fax data software go to the section entitled Software Installation and Testing page 29 Un installing the Winmodem Software 1 From the Start menu point to Settings and then click Control Panel ...

Страница 31: ...ODEM INSTALLATION UNDER WINDOWS 95 27 2 Double click the Modem icon circled below and then click on your Winmodem Click on the Properties button 3 Choose the Port Settings tab and click the Uninstall button ...

Страница 32: ... successfully uninstalled your Winmodem 4 If you uninstalled your Winmodem software due to a failed installation please return to the section entitled Installing the Winmodem Software under Windows 950 or 950a page 21 or the section entitled Installing the Winmodem Software under Windows 950b page 22 If you are not sure which version of Windows 95 you are using please refer to the section entitled...

Страница 33: ...rough installing software off the CD and testing your modem by registering it online Once you ve followed this section s instructions to start the Wizard simply follow the Wizard s on screen instructions NOTE The following instructions apply to Windows 3 x and Windows 95 users However only Windows 95 screens are shown NOTE If you have an older version of RapidComm installed on your system uninstal...

Страница 34: ... button and then click Run 2 In the text box type D setup exe If your CD ROM drive has a letter name other than D type that letter in place of D Click OK 3 Follow the on screen instructions to run the Wizard After running the Wizard you ll be given the option to explore other areas of the Connections CD ...

Страница 35: ...es not install RapidComm To install RapidComm insert the Connections CD and double click on the CD Rom icon Click on the Business and Productivity Section Now double click the RapidComm icon and then double click on the RapidComm icon The CD also contains an electronic user s guide for RapidComm You can install this guide by clicking on the User s Guide icon located next to the RapidComm icon Once...

Страница 36: ...ask you to select the type of modem you are using Select a U S Robotics Sportster high speed modem If that selection is not listed pick Courier Dual Standard V 32bis or V 34 KEY POINT Refer to your software manual for the program s installation instructions The software s installation program will ask you questionsaboutthe modemyouareusing Initialization String For hardware flow control a fixed se...

Страница 37: ...ol select XON XOFF NOTE You may need to disable the type of flow control hardware or software that you are not using NOTE DO NOT select a 28 800 14 400 or 12 000 bps serial port rate if offered Your modem will NOT work correctly with any of these settings Fix or lock the serial port baud rate if it s referred to as autobaud select OFF ...

Страница 38: ... Why Modem Station Modem commands can be confusing and difficult to memorize Communications software often requires technical information about your modem You may want to tweak your modem for optimum performance Installing Modem Station If you did not install Modem Station when you first installed the Connections CD please follow these instructions 1 Insert the Connections CD into your CD ROM driv...

Страница 39: ...o install Modem Station Click Yes 7 Wait a few moments for the Installation Wizard to load 8 After reading the information on the Welcome screen click Next 9 When you see this screen click Next to accept the default directory or click Browse to change directories ...

Страница 40: ...fault program folder You can place Modem Station in an existing folder by selecting one from the list 11 When you see the following screen click Finish to complete the installation If this is the first time you ve installed Modem Station you may be asked to restart your computer ...

Страница 41: ...EW MODEMS This option detects US Robotics modems installed on your system and shows what COM port they are using Click this option if you are running Modem Station for the first time if you are changing modems or if you simply need to know what port your modem is using TERMINAL Terminal allows you to send commands directly to your modem and displays the responses You can use Terminal to dial up BB...

Страница 42: ...m s performance We will discuss Modem Configurator s options in more detail in later sections ABOUT The About option provides copyright and version information CONTACT SUPPORT This option details how to get in touch with 3Com TIP For your convenience we provide many on line support avenues For specific questions our fax on demand service is a good place to start You can download FAQs software and ...

Страница 43: ...PC You can scan a specific port s by selecting the checkbox for that port 2 Click Scan to have Modem Station check for installed modems This may take a few moments 3 When the scan finishes you will see the following display Your display may differ depending on the type and number of modems installed If your modem is installed and configured correctly Modem Station will find the ...

Страница 44: ... Please refer to your system s documentation or contact the manufacturer of your system for further information If you look at the information for the port your modem is using you will see three buttons These allow you to access Terminal and Modem Configurator without going back to the main menu Extended Information provides detailed information about your modem previous connections firmware dates...

Страница 45: ...n s Terminal window is provided primarily for troubleshooting convenience If you frequently use BBSs you will probably want to use a separate full featured Terminal program such as that provided in our RapidComm software On the lower part of the Terminal screen you will see the COM port your modem is currently using To select another modem simply click on the arrow and select that modem s assigned...

Страница 46: ...need to tell the Dialer a few things about your phone system such as whether it uses tone or pulse dialing what digit if any you need to dial to get an outside line and whether the dialer should wait between dialing that digit and the rest of the number Once you provide this information simply enter the phone number as if you were dialing a telephone Click Dial Now to dial the number You can end a...

Страница 47: ...ems screen Click Modem Configurator to bring up this menu The Modem Configurator menu gives you access to the following options Data Control This is the Data Control screen The Data Control screen allows you to assign the following basic communications settings PORT SPEED PARITY STOP BITS WORD LENGTH FLOW CONTROL SERIAL PORT RATE ...

Страница 48: ...entered the Data Control settings click Save to Modem This stores the settings so that you do not have to re enter them This screen also displays the default DIP switch settings TECHNICAL STUFF DIP switches are tiny switches that control a few basic functions on some external modems On modems without DIP switches these functions are handled by modem commands Click Exit to return to the Modem Confi...

Страница 49: ...to configure the following settings DATA TERMINAL READY DTR ERROR CORRECTION DATA COMPRESSION CARRIER DETECT For detailed information about these settings refer to the Glossary or the Technical Quick Reference sections of this manual TIP On external modems receiving a Data Terminal Ready signal from the PC causes the TR light to light up Click Help for quick definitions of terminology used in this...

Страница 50: ...ntrol how your modem and computer communicate with each other They control what you see on your terminal screen and how results are displayed If you look in the upper left hand corner of the display you will see the commands currently in use The Modem to Computer screen allows you to configure the following settings LOCAL ECHO RESULT CODES RESULT CODE PREFERENCES ...

Страница 51: ...nitions of terminology used in this screen This screen also includes a chart of the ways result codes can be displayed Click Codes to view a chart of the display options Once you configure your settings click Save to Modem to save your choices CONNECTION RATES The Connection Rates screen allows you to configure modem speeds and protocols WARNING Use caution when changing connection settings Improp...

Страница 52: ...r menu Please refer to the main body of the manual and the Glossary for detailed information about the terminology and settings used in this screen Click Help for quick definitions of terminology used in this screen DIALING ANSWERING The next screen allows you to adjust how your modem initiates and receives calls Using this screen you can configure the following dial settings WAIT FOR CARRIER AUTO...

Страница 53: ...t is reset This is very useful if you are using your modem with a dumb terminal or know that you need to connect to a specific bulletin board or listing service You can change stored numbers by highlighting them and then typing the new numbers in their place Once you store your numbers you can dial them by entering a single command from Terminal Mode for example ATDS0 ATDS1 or ATDS2 Your U S Robot...

Страница 54: ...te a separate section to the Extended Information screens so that we can explain what you ll see and why it is important to you as fully as possible There are a series of commands used to obtain detailed information from U S Robotics modems Extended Information provides a convenient way to get that important information without memorizing the commands From the Detect New Modems screen click Extend...

Страница 55: ...bring up the following screen Technicians use the ROM Checksum to verify information stored in the modem s Read Only Memory For information about the specific modem you are using click Product to bring up the next screen The Product screen displays the make and model of your modem Your modem is able to store two configurations or profiles Only one can be active at any time ...

Страница 56: ...rrently in use Below them is a display of the contents of the S Registers for your modem These registers are special programmable areas of your modem s memory They are used to store commands that are too complex to be handled by the standard or AT commands Just below that you will see the last number dialed The next option displays the Stored Profile screen This screen shows the configuration stor...

Страница 57: ...he make and model of your modem Options displays the protocols available to your modem Fax Options displays your fax compatibility Clock Frequency displays the speed of the tiny clock that controls the timing of operations within the modem EPROM displays how much information can be stored in the EPROM or Supervisor chip RAM displays how much memory your modem has for processing commands and intern...

Страница 58: ...alent of software version numbers DAA Country displays the countries your modem is designed for This is important because phone systems and telecommunications laws vary from country to country Click Link Diagnostics to bring up the Link Diagnostics screen The Link Diagnostics screen displays statistics about your last connection This screen is most often used as an aid in diagnosing connection fai...

Страница 59: ...ou suspect problems with your phone service If you are having connection problems go directly to this screen to get this information If you save anything to the modem between the last connection and this screen the modem will not save these settings Only our U S Robotics Winmodems use VxDs or Virtual Device Drivers The Winmodem uses special software called a driver to manage many of the functions ...

Страница 60: ...em to the latest code NOTE You can also obtain this software from our BBS 847 982 5092 or from our World Wide Web page http www 3Com com 56k NOTE Complete the instructions in the Software Installation chapter starting on page 29 before installing the Modem Update Wizard NOTE The following instructions apply to Windows 3 x and Windows 95 users However only Windows 95 screens are shown ...

Страница 61: ...6 Click the Modem Update Wizard button 7 Follow the on screen instructions to complete the installation 8 When you see the screen below the setup is complete Click OK NOTE For more detailed instructions see our World Wide Web page http www 3Com com 56k Updating Your Modem 1 Click Start Point to Programs Then point to U S Robotics Modem Update Wizard Finally point to the Modem Update Wizard selecti...

Страница 62: ...the modem by typing ATE0 and then pressing ENTER in your software s terminal mode To turn the local echo setting off in the software refer to its documentation PROBLEM The modem won t go off hook to dial or doesn t answer the phone Diagnosis You may have plugged your modem s phone cord into a digital line Possible Solution Plugging your modem s phone cord into a digital phone line can damage the m...

Страница 63: ...d be plugged into the TELCO jack on the modem and the wall phone jack The phone cord should be no longer than 12 feet in length Use the phone cord included in your U S Robotics box if possible Diagnosis The phone jack may have been wired incorrectly Possible Solution Contact the telephone company Ask them to make sure the tip and ring are on the inside pair of wires Diagnosis You may have devices ...

Страница 64: ...sses the dial tone allowing a connection if the modem is functioning properly PROBLEM Both modems sound like they exchange carrier signals but fail to establish a link Diagnosis You may have a poor line connection Possible Solution Try placing the call again The phone company routes calls differently each time To verify a valid phone connection enter RapidComm s Terminal mode and type ATX3DT184798...

Страница 65: ...Actual speeds may vary An analog phone line compatible with the 56K ITU standard or x2 technology and an Internet provider or corporate host site compatible with the 56K ITU standard or x2 technology are necessary for these high speed downloads Possible Solutions Check http www 3com com 56k for a list of ISPs that observe the 56K ITU standard and or offer x2 technology Call your phone company to f...

Страница 66: ...m by typing AT M0 in terminal mode and pressing ENTER Now try placing the call to the remote modem again When finished reset your modem to enable the error control features In terminal mode type ATZ and press ENTER NOTE ATZ4 or AT F1 are often the best reset strings as they restore hardware flow control defaults PROBLEM Your screen keeps displaying random garbage characters Diagnosis You could hav...

Страница 67: ...ave the same flow control settings hardware RTS CTS and software xon xoff Diagnosis The best flow control settings might not be enabled on your modem Possible Solution In terminal mode type AT F1 and press ENTER to set hardware flow control PROBLEM Your commun ications software is reporting many cyclic redundancy check CRC errors and low characters per se cond CPS Diagnosis You may have a bad phon...

Страница 68: ...ng the CRC errors Possible Solution Close every program but the communications program Diagnosis The remote site you are dialing into may have trouble with the file transfer protocol Possible Solution Try using a different file transfer protocol Do not use Xmodem if other protocols are available Zmodem is the preferred protocol Diagnosis There may be a Terminate and Stay Resident TSR program such ...

Страница 69: ...your hard disk Possible Solution Download to an uncompressed area on your hard drive PROBLEM Errors are co nstantly occurring in your V 17 fax transmissions Diagnosis There may be a Terminate and Stay Resident TSR program such as a screen saver or virus scanner running in the background disrupting data communications Possible Solution Disable any Terminate and Stay Resident TSR programs running in...

Страница 70: ...0 Diagnosis You may be trying to fax a compressed file Possible Solution Open the file in the application in which it was created Select RapidComm as the printer and then print the file PROBLEM RapidComm fails to initialize the modem Diagnosis RapidComm s port settings may be incorrect Possible Solution Make sure RapidComm s port settings are correctly set for your modem ...

Страница 71: ...ined on the Connections CD ROM that came with your new modem Otherwise system conflicts may hamper RapidComm s ability to work properly PROBLEM Plug and Play does not detect your modem You ve installed the modem and Windows has restarted but you simply see your desktop You do not see any screens indicating new hardware has been detected Diagnosis The Plug and Play installation was not successful ...

Страница 72: ...ws 95 installation on page 15 If you do not see the new hardware screens continue with step 2 2 Click Windows 95 Start point to Settings and click Control Panel Double click the System icon and then click the Device Manager tab on the System Properties screen Look for Other Devices or Unknown Devices in the list that appears If you do not see either of these options in the list continue with the n...

Страница 73: ... follow these steps 1 Start your fax data communications program The software settings for our BBS are ANSI terminal emulation Data Bits 8 Parity None Stop Bits 1 2 Put the program in Terminal mode 3 Type ATDS0 the last digit is a zero and press ENTER NOTE ATDS0 the last digit is a zero automatically dials 1 847 982 5092 the 3Com BBS If this is your first time connecting to our BBS you will be ask...

Страница 74: ... 3Com offers a number of other online technical support options Choose any one of the following options for help with and or more information on your new modem Internet FTP Provides free library containing the same files as the BBS site FTP to ftp usr com Internet on Demand Provides automatic technical support through a library containing product information quick reference cards and installation ...

Страница 75: ...om through America Online Go to the Keyword field and type 3Com to connect to various 3Com resources such as file libraries message boards online customer support and product announcements Customer Support via the Phone Technical questions about 3Com modems can also be answered by technical support specialists NOTE Before calling please have the diagnostic program Modem Station installed on your s...

Страница 76: ...6 00 pm CST Monday Friday Automated service is available 24 hours a day 7 days a week Priority No Hold Service 3Com also staffs its own fee based 900 number for immediate assistance These lines are staffed from 8a m 10 p m Monday through Friday CST and 9 a m 5 p m Saturday and Sunday CST Service available in the U S only Hours subject to change without notice No Hold line 900 555 USR1 There will b...

Страница 77: ...urn the modem for repair you will receive an SRO Service Repair Order number You must have an SRO number before returning the modem to us Ship the unit postage paid in a strong box made of corrugated cardboard with plenty of packing material DO NOT send the modem back in the original box Send ONLY the modem NOT the power supply manuals CD ROM etc Include your SRO number name and address on the shi...

Страница 78: ...wavelengths that can be transmitted over communications lines such as the sound of a voice over the phone line Contrast with digital signals answer mode The mode used by your modem when answering an incoming call from an originating modem The transmit receive frequencies are the reverse of the originating modem which is in originate mode application A computer program designed to perform a specifi...

Страница 79: ...The addition of start stop bits to each character serves this purpose Auto Answer Sets the modem to pick up the phone line when it detects a certain number of rings See S register S0 in the Technical Quick Reference auto dial A process where your modem dials a call for you The dialing process is initiated by sending an ATDT dial tone or ATDP dial pulse command followed by the telephone number to d...

Страница 80: ...00 9600 14 400 28 800 and higher bits per second bps The bits binary digits per second rate Thousands of bits per second are expressed as kilobits per second or Kbps buffer A memory area set aside to be used as temporary storage during input and output operations An example is the modem s command buffer byte A group of binary digits stored and operated upon as a unit In user documentation the term...

Страница 81: ...h as longer transmission frames and data compression to increase cps class 1 and 2 0 International standards used between fax application programs and faxmodems for sending and receiving faxes cyclic redundancy checking CRC An error detection technique consisting of a test performed on each block or frame of data by both sending and receiving modems The sending modem inserts the results of its tes...

Страница 82: ...ns or Circuit Terminating equipment such as dial up modems that establish and control the data link via the telephone network default Any settings assumed at installation startup or reset by the computer s software and attached devices These settings remain in effect until changed by the user or other software detect phase In the ITU T V 42 error control protocol the first stage in establishing if...

Страница 83: ...s DTE Data terminal or terminating equipment A computer that generates or is the final destination of data duplex Indicates a communications channel capable of carrying signals in both directions See half duplex full duplex Electronic Industries Association EIA Group which defines electronic standards in the U S error control Various techniques that check the reliability of characters parity or bl...

Страница 84: ...usually includes a frame number block size data error check codes and Start End indicators full duplex Capable of signal flow in both directions simultaneously In microcomputer communications may refer to the suppression of the online local echo half duplex Capable of signal flow in both directions but signals may flow only one way at a time In microcomputer communications may refer to activation ...

Страница 85: ...s The initials ITU T represent the French name In English it is known as the International Telegraph and Telephone Consultative Committee LAPM Link Access Procedure for Modems An error control protocol defined in ITU T Recommendation V 42 Like the MNP protocols LAPM uses cyclic redundancy checking CRC and retransmission of corrupted data ARQ to ensure data reliability local echo A modem feature th...

Страница 86: ...e back to digital signals before passing them to the receiving computer nonvolatile memory NVRAM User programmable random access memory whose data is retained when power is turned off On the Sportster it includes four stored phone numbers and the modem settings off on hook Modem operations that are the equivalent of manually lifting a phone receiver taking it off hook and replacing it going on hoo...

Страница 87: ... must be used by two communicating computers or both may omit parity protocol A system of rules and procedures governing communications between two or more devices Protocols vary but communicating devices must follow the same protocol in order to exchange data The format of the data readiness to receive or send error detection and error correction are some of the operations that may be defined in ...

Страница 88: ...a single channel Compare to parallel transmissions where data flows simultaneously in multiple channels start stop bits The signaling bits attached to a character before the character is transmitted during asynchronous transmission terminal A device whose keyboard and display are used for sending and receiving data over a communications link Differs from a microcomputer or a mainframe in that it h...

Страница 89: ...making facsimile connections at 14 400 bps 12 000 bps 9 600 bps 7 200 bps V 21 An ITU T standard for modems operating in asynchronous mode at speeds up to 300 bps full duplex on public switched telephone networks V 22 An ITU T standard for modem communications at 1200 bps compatible with the Bell 212A standard observed in the U S and Canada V 22 bis An ITU T standard for modem communications at 24...

Страница 90: ...line quality is impaired V 32 bis An ITU T standard that extends the V 32 connection range 4800 7200 9600 12 000 and 14 400 bps V 32 bis modems fall back to the next lower speed when line quality is impaired fall back further as necessary and also fall forward switch back up when line conditions improve see online fall back fall forward V 34 An ITU T standard that currently allows data rates as hi...

Страница 91: ...s used to transfer files between modems These protocols are in the public domain and are available from many bulletin board services XON XOFF Standard ASCII control characters used to tell an intelligent device to stop resume transmitting data Ymodem An error checking protocol that can send several files of data at a time in 1024 byte 1K blocks This protocol can use either checksums or CRC for err...

Страница 92: ...cept any interference received including interference that may cause undesired operations Part 68 This equipment complies with FCC Rules Part 68 Located on the bottom of the modem is the FCC Registration Number and Ringer Equivalence Number REN You must provide this information to the telephone company if requested The REN is used to determine the number of devices you may legally connect to your ...

Страница 93: ... responsible for compliance could void the user s authority to operate the equipment Canada IC This digital apparatus does not exceed the Class B limits for radio noise emissions from digital apparatus set out in the interference causing equipment standard entitled Digital Apparatus ICES 003 of Industry Canada Cet appareil numérique respecte les limites de bruits radioélectriques applicables aux a...

Страница 94: ...ed Fax Branding The Telephone Consumer Protection Act of 1991 makes it unlawful for any person to use a computer or other electronic device including fax machines to send any message unless such message clearly contains in a margin at the top or bottom of each transmitted page or on the first page of the transmission the date and time it is sent an identification of the business or other entity or...

Страница 95: ...n a residential installation However there is no guarantee that interference will not occur in a particular installation If this device does cause interference to radio or television reception which you can determine by monitoring reception when the modem is installed and when it is removed from the computer try to correct the problem with one or more of the following measures Re orient the receiv...

Страница 96: ...e operational and safety requirements as prescribed in the appropriate Terminal Equipment Technical Requirements document s 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 The equipment must also be installed u...

Страница 97: ... together This precaution may be particularly important in rural areas CAUTION Do NOT attempt to make such connections yourself Instead contact an electric inspection authority or electrician as appropriate NOTICE The Ringer Equivalence Number REN assigned to each terminal device provides an indication of the maximum number of terminals allowed to be connected to a telephone interface The terminat...

Страница 98: ...nné ne doit pas oublier qu il est possible que la conformité aux conditions énoncées ci dessus n empêche pas le dégradation du service dans certaines situations Les réparations de matériel homologué doivent être effectuées par un centre d entretien canadien autorisé désigné par le fournissuer La compagnie de télécommunications peut demander à l utilasateur de débrancher un appareil à la suite de r...

Страница 99: ...s 5 L Indice d Equivalence de la Sonnerie IES est situé au revers du modem modems externes ou sur le circuit imprimé modems internes Centre de guarantie et de service après vente Keating Technologies 25 Royal Crest Court Suite 200 Markham ONT L3R 9X4 Limited Warranty U S Robotics Access Corp a subsidiary of 3Com Corporation warrants to the original end user purchaser that this product will be free...

Страница 100: ... TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE OR PURPOSE U S ROBOTICS SHALL IN NO EVENT BE LIABLE FOR ANY SPECIAL INDIRECT INCIDENTAL PUNITIVE OR CONSEQUENTIAL DAMAGES OF ANY KIND OR CHARACTER INCLUDING WITHOUT LIMITATION LOSS OF REVENUE OR PROFITS FAILURE TO REALIZE SAVINGS OR OTHER BENEFITS LOSS OF DATA OR USE DAMAGE TO EQUIPMENT AND CLAIMS AGAINST THE PURCHASER BY ...

Страница 101: ...mited warranty request Once you have received your SRO number take or send the product postage prepaid and insured to 3Com Attn RMA your SRO 6201 W Oakton East Dock Morton Grove IL 60053 Pack the modem in a strong corrugated cardboard box with plenty of packing material DO NOT send the modem back in its original box DO NOT send anything but the modem do not send back the power supply CD ROM docume...

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