3Com 3C900B - Manuals

B EFORE Y OU B EGIN (W INDOWS 95 U SERS ) 2 Determining Your Version ofWindows 95 Follow these steps to determine your versionof Windows 95. This information will beimportant during installation. 1. Click the My Computer icon on yourdesktop with the right mouse button. 2. Click Properties. 3. In the...

M ODEM I NSTALLATION WITH W INDOWS 3. X 4 processing unit (CPU) so that the accessorycan perform a task. The computer stops whatit’s doing, depending on the priority of therequest, to help the accessory perform its task.When two accessories share an IRQ, it’s liketwo people asking different question...

M ODEM I NSTALLATION WITH W INDOWS 3. X 6 4. Click Internal Modem. Then click Next. 5. If you have a free setting, you will see ascreen like this. COM2/IRQ3 is free in this example.ComTest might instead recommendCOM1/IRQ4, COM3/IRQ4, orCOM4/IRQ3 for your modem. Write down the displayed settings. You...

M ODEM I NSTALLATION WITH W INDOWS 3. X 7 Click Finish to exit ComTest. Go to “Whatto Do with ComTest’s Recommendation”on page 8. 6. When you see this screen, click Finish toexit ComTest. Go to “What to Do with ComTest’sRecommendation” on page 8. Testing an Installed Modem If there is a modem alread...

M ODEM I NSTALLATION WITH W INDOWS 3. X 8 What to Do with ComTest’sRecommendation NOTE: If your communications software requires a modem thatComTest does not recommend, there isa good chance that the setting is beingused by another device in your system.To free that setting in your system,consult yo...

M ODEM I NSTALLATION WITH W INDOWS 3. X 9 If you do not have a sound card, useCOM3/IRQ5. Write “COM3” and “IRQ5”somewhere where it will be handy duringsoftware installation. You will have to changethe settings on your modem. Go to “How toChange the Modem’s Settings” on page 10. If you do have a soun...

M ODEM I NSTALLATION WITH W INDOWS 3. X 11 modem’s jumper pins (see the followingdiagram). 3. To change the COM port and IRQ settings,you need to reposition the jumper shunts onthe COM port and IRQ pins. To do this, liftthe jumper shunts off the pins. TIP: Grasp the jumper shunts with a tweezers or ...

M ODEM I NSTALLATION WITH W INDOWS 3. X 12 4. Move the jumper shunt to the new setting. • The COM port setting can involve oneto three shunts. The four possible COMport settings are as follows: 0 1 SEL COM 1 0 1 SEL COM 3 0 1 SEL COM 4 0 1 SEL COM 2 • Unlike most COM port settings, theIRQ setting in...

M ODEM I NSTALLATION WITH W INDOWS 3. X 13 1. Turn off your computer and unplug it fromthe electrical outlet. 2. Unplug any peripheral devices (printer,monitor, keyboard, mouse, etc.) from thecomputer. TIP : Before you unplug anything, label the cords or make a sketch of howthings are connected. Thi...

M ODEM I NSTALLATION WITH W INDOWS 3. X 15 modem all the way into the slot. If you feelresistance, the modem may not be properlylined up with the slot. Do not force it intothe slot. Remove the modem and try again. 6. Once the modem is in place, fasten it firmlyusing the screw that you removed in ste...

M ODEM I NSTALLATION WITH W INDOWS 3. X 16 NOTE: You cannot use the modem and a phone at the same time if theyshare the same telephone line. 11. Plug the microphone included with yourmodem into the MIC jack on the modem. 12. To enhance the modem’s full-duplex speakerphone capabilities, plug a set of...

M ODEM I NSTALLATION WITH W INDOWS 3. X 17 14. Double-click the Control Panel icon. 15. Double-click the Ports icon. 16. If it’s not already selected, click the COM port for your modem. Then click Settings. 17. Click Advanced.

M ODEM I NSTALLATION WITH W INDOWS ® 95 19 You will need these items from yourSportster ™ modem box: modem phone cord Connections ™ CD microphone Plus: a screwdriver (not included) Since your new Sportster is a “Plug and Play”device, Windows 95 may be able to detectyour modem automatically after you...

M ODEM I NSTALLATION WITH W INDOWS 95 24 this jack, disconnect the telephone cordfrom the jack. WARNING : The phone jack you use must be for an ANALOG phone line(the type found in most homes). Manyoffice buildings have digital phonelines. Be sure you know which type ofline you have. The modem will b...

M ODEM I NSTALLATION WITH W INDOWS 95 25 13. Plug the power cords, cables, andperipherals back into the computer and turnon the computer. Installing the ModemDrivers NOTE: If you wrote “950b” on page 2 of this User’s Guide, go to“Installing Modem Drivers withWindows 95 Version 950b” on page 29.Other...

M ODEM I NSTALLATION WITH W INDOWS 95 28 This means the installation was a success.Click OK. NOTE: If you do not see your modem listed in the precedingscreen, the Plug and Play installationwas unsuccessful. Please refer to“When Plug and Play Fails” on page95. 6. Next, click the Diagnostics tab at th...

M ODEM I NSTALLATION WITH W INDOWS 95 29 Installing Modem Drivers withWindows 95 Version 950b 1. When Windows restarts, it should detectthe modem (see following screen image).Insert the Connections CD and click Next. NOTE: If this screen does not appear, go to the section titled “WhenPlug and Play F...

S OFTWARE I NSTALLATION AND T ESTING 33 Software Installation andRegistration Using theSetup Wizard This section guides you through the U.S.Robotics Setup Wizard, the Connections ™ CD-ROM interface, and the installation ofRapidComm ™ Voice fax/data/voice software. It also shows you how to register a...

S OFTWARE I NSTALLATION AND T ESTING 35 5. This is the Setup Wizard’s “Welcome”screen. After reading the screen, clickNext. 6. When you see the following screen, selectyour modem from the list and select thecorrect COM port setting in the Port box.Then click Next. NOTE: Check the COM port setting ag...

S OFTWARE I NSTALLATION AND T ESTING 38 11. When you see this screen, you are ready toregister your new modem. Click ByModem. We recommend you choose theBy Modem option because it’s a greatway to verify that your Sportster modem iscorrectly installed. 12. When you see this screen… • If you need to d...

S OFTWARE I NSTALLATION AND T ESTING 39 • If you do not need to dial a prefix,simply click Dial. 13. You will see a screen indicating that theregistration information has been sent (seecircled text in the screen below). 14. The next screen indicates that the Setup Wizard is finished. Click OK to lau...

S OFTWARE I NSTALLATION AND T ESTING 40 At the end of the installation process, youwill see the following screen. Click Yes. Windows 95 users: Windows will restart and the Connections CD will launchautomatically upon restart. Windows 3.x users: Windows will restart. When your desktop reappears, youw...

S OFTWARE I NSTALLATION AND T ESTING 41 15. When the main Connections menu appears,click Business & Productivity on themenu on the left hand side of the screen(circled below). 16. On the Business & Productivity menu is a RapidComm Voice button (circled in thefollowing screen shot). RapidComm...

S OFTWARE I NSTALLATION AND T ESTING 42 17. The next screen contains another menu onthe right hand side of the screen. Includedon the menu is a Learn More & GetSoftware button (circled in the screenimage below). Click this button. 18. The next screen displays information about the RapidComm Voic...

S OFTWARE I NSTALLATION AND T ESTING 43 NOTE: If you are using Netscape Navigator to view your Connections CD-ROM, you may be asked to save theapplication’s installer to your computerwhen you click the Install button. Notethe installer’s file name and its locationon your computer. To run the install...

S OFTWARE I NSTALLATION AND T ESTING 44 21. When you see this screen, click either Yes or No. • If you click Yes, every document you print will betreated as a fax unless you change the printerselection in the program from which you areprinting. • If you click No, RapidComm Voice will not beselected ...

S OFTWARE I NSTALLATION AND T ESTING 45 24. Restart Windows by clicking the Windows Start button and pointing to Shut Down.Click Restart the Computer? on the“Shut Down Windows” screen. Then clickYes. 25. When your desktop appears, click Windows Start. Point to Programs. Thenpoint to RapidComm Voice....

S OFTWARE I NSTALLATION AND T ESTING 46 27. When you see this screen, verify the information shown and then fill in the Databox (if you have a third phone number justfor your modem) and the Local AreaCode box. Then click Next. 28. After you verify the information on this screen, click Next.

S OFTWARE I NSTALLATION AND T ESTING 47 29. Select the correct modem in the text box on the following screen. Then click Next. 30. The next screen allows you to select single or multiple mailboxes for your personalvoice mail system. Click Single orMultiple and then click Next.

S OFTWARE I NSTALLATION AND T ESTING 48 31. When you see this screen… • If you want the RapidComm Voiceprogram to launch at Windows startup,select the box to the left of RunRapidComm Voice at Windowsstartup. A check will appear in the box.Then click Finish. • If you do not want RapidComm Voiceto sta...

S OFTWARE I NSTALLATION AND T ESTING 50 5. When you see the following screen, fill inthe necessary information in the text boxes.For testing purposes, send your “tester”document to the 3Com fax number, 847-676-3559. NOTE: If you need to enter a prefix (such as 9) to dial a numberoutside your buildin...

I NSTALLING O THER F AX /D ATA S OFTWARE 52 Your modem was designed for and testedusing a wide range of communications softwarepackages. This section will guide you throughsome of the details you may need to knowwhen installing communications softwarepackages other than RapidComm Voice(included on t...

U.S. R OBOTICS M ODEM U PDATE W IZARD 53 Your Connections ™ CD-ROM includes the U.S. Robotics Modem Update Wizard. This softwareis designed to quickly update your modem,whether to a newer version of its current code orto 3Com’s revolutionary new x2 ™ technology. You can update your modem in any of t...

U.S. R OBOTICS M ODEM U PDATE W IZARD 54 2. Click the Windows Start menu and point toPrograms. Point to U.S. RoboticsConnections. Then click Connections. NOTE: Windows 3.x users launch the CD-ROM by clicking the Connections iconin the Connections program group. 3. From the main Connections menu, cli...

U.S. R OBOTICS M ODEM U PDATE W IZARD 57 8. The next screen indicates where the installerwill store the files for the Update Wizard. If theindicated location is acceptable, click Next.Otherwise, click Browse to find an acceptabledirectory. 9. You will see the following screen for a momentas the inst...

U.S. R OBOTICS M ODEM U PDATE W IZARD 58 Operation 1. Click the Windows Start button. Point toPrograms. Then point to U.S. RoboticsModem Update Wizard. Finally, clickModem Update Wizard. 2. After you read the “Welcome” screen, clickNext. 3. This brings up the license agreement. Afterreading the lice...

U.S. R OBOTICS M ODEM U PDATE W IZARD 59 4. The software will now detect any modemsinstalled on your system. When the detectionphase finishes, you will see the following screen(the modems shown on your screen maydiffer). Click the modem you wish to upgradeand then click Next to continue. 5. The prog...

U.S. R OBOTICS M ODEM U PDATE W IZARD 60 • Click Other to learn more about how to purchase a U.S. Robotics x2 modem. Upgradable Modems If the modem IS software upgradable, you willsee the following screen. Click Dial U.S. Robotics (which should bethe default selection) in the pull-down menu.Click Up...

U.S. R OBOTICS M ODEM U PDATE W IZARD 61 7. The following screen dials the U.S. RoboticsUpdate Server. Click Tone or Pulse dialing asnecessary. If you normally dial a prefix (suchas 9) to dial out on your phone line, type thatprefix before the 1 in the Prefix box. Thenclick Dial. NOTE: Your screen m...

U.S. R OBOTICS M ODEM U PDATE W IZARD 62 8. Once connected, the server will compareavailable upgrades with the current code inyour modem. If they differ, the server willautomatically initiate the download procedure. NOTE: Users purchasing a 56K upgrade are asked if the charge is acceptable (see the ...

U.S. R OBOTICS M ODEM U PDATE W IZARD 63 9. You will see this screen as the Wizarddownloads the file for your modem. 10. When the download is complete, the modem disconnects from the server. The words“Downloading file…” change to “Upgrading…” or “Updating …”, depending on whetheryou are upgrading or...

U.S. R OBOTICS M ODEM U PDATE W IZARD 64 12. You will see a “Congratulations!” screen. Click Details. 13. Click OK once you verify that the process wasa success. When you return to the“Congratulations!” screen, click Finished. Congratulations! Enjoy the benefits of your updated Sportstermodem!

U SING M ODEM S TATION 65 What Does Modem StationDo? ♦ Modem Station provides a simple to useinterface that makes communicating withyour modem even easier. ♦ Modem Station allows you to point andclick your way through configuration. ♦ Modem Station can automatically detectyour modem and provide you ...

U SING M ODEM S TATION 67 10. Click Next on the following screen to accept the default program folder. You canplace Modem Station in an existing folderby selecting one from the list. 11. When you see the following screen, clickFinish to complete the installation. If this is the first time you’ve ins...

U SING M ODEM S TATION 68 Starting Modem Station 1. If you didn’t start Modem Station from theSetup program, please start it now. 2. Click Windows Start button and then pointto Programs. Click U.S. RoboticsModem Station (or the folder youselected during installation). 3. Click the Modem Station icon...

U SING M ODEM S TATION 69 The main menu gives you direct access tothe following options: ♦ DETECT NEW MODEMS ♦ TERMINAL ♦ MODEM CONFIGURATOR ♦ ABOUT ♦ CONTACT/SUPPORT DETECT NEW MODEMS This option detects US Robotics modemsinstalled on your system and shows whatCOM port they are using. Click this op...

U SING M ODEM S TATION 70 CONTACT/SUPPORT This option details how to get in touch withU.S. Robotics. T I P : F o r y o u r c o n v e n i e n c e , w e p r o v i d e m a n y o n - l i n e s u p p o r ta v e n u e s . F o r s p e c i f i c q u e s t i o n s ,o u r f a x - o n - d e m a n d s e r v i c...

U SING M ODEM S TATION 71 2. Click Scan to have Modem Station checkfor installed modems. This may take a fewmoments. 3. When the scan finishes, you will see thefollowing display. Your display may differdepending on the type and number ofmodems installed. If your modem is installed and configuredcorr...

U SING M ODEM S TATION 72 If you look at the information for the port yourmodem is using, you will see three buttons.These allow you to access Terminal andModem Configurator without going back tothe main menu. Extended Information providesdetailed information about your modem,previous connections, f...

U SING M ODEM S TATION 73 NOTE: M o d e m S t a t i o n ’ s T e r m i n a l w i n d o w i s p r o v i d e dp r i m a r i l y f o r t r o u b l e s h o o t i n gc o n v e n i e n c e . I f y o u f r e q u e n t l y u s eB B S s , y o u w i l l p r o b a b l y w a n t t ou s e a s e p a r a t e , f u ...

U SING M ODEM S TATION 74 modem. We will discuss port speed settings indetail later in this section. Terminal includes a basic auto dialer. To have Terminal dial a number for you, clickDial to bring up the “Dial” screen. You need to tell the Dialer a few things aboutyour phone system, such as whethe...

U SING M ODEM S TATION 75 The Modem Configurator menu gives youaccess to the following options: ♦ DATA CONTROL ♦ CONNECTION CONTROL ♦ MODEM TO COMPUTER ♦ CONNECTION RATES ♦ DIALING/ANSWERING ♦ STORED NUMBERS ♦ RESTORE DEFAULTS ♦ EXIT Data Control This is the “Data Control” screen. The “Data Control”...

U SING M ODEM S TATION 76 Once you have entered the Data Controlsettings, click Save to Modem. This storesthe settings so that you do not have to re-enterthem. This screen also displays the default DIPswitch settings. T E C H N I C A L S T U F F : DIP s w i t c h e s a r e t i n y s w i t c h e s t ...

U SING M ODEM S TATION 77 Use the “Connections Control” screen toconfigure 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 QuickReference” sections of th...

U SING M ODEM S TATION 78 If you look in the upper left hand corner of thedisplay, you will see the commands currently inuse. The “Modem to Computer” screen allows youto configure the following settings: ♦ LOCAL ECHO ♦ RESULT CODES ♦ RESULT CODE PREFERENCES TIP: If you type ATDT and see ‘AATTDDTT’ o...

U SING M ODEM S TATION 79 CONNECTION RATES The “Connection Rates” screen allows you toconfigure modem speeds and protocols. W A R N I N G ! U s e c a u t i o n w h e n c h a n g i n g c o n n e c t i o ns e t t i n g s . I m p r o p e r s e t t i n g s m a yc a u s e y o u r m o d e m t o f u n c t ...

U SING M ODEM S TATION 80 DIALING/ANSWERING The next screen allows you to adjust how yourmodem initiates and receives calls. Using this screen, you can configure thefollowing dial settings: ♦ WAIT FOR CARRIER ♦ AUTO-ANSWER # OF RINGS ♦ SPEAKER OPERATION ♦ DIALING METHOD ♦ SPEAKER VOLUME TECHNICAL ST...

U SING M ODEM S TATION 82 available from many of the screens withinModem Station. When you click RestoreDefaults, you will see a confirmation screenasking if you aresure you want to restore defaults. Click OK toproceed. T I P : R e s t o r e D e f a u l t s w i l l s e t y o u r m o d e m b a c k t ...

U SING M ODEM S TATION 83 ♦ CONFIGURATION PROFILE ♦ LINK DIAGNOSTICS ♦ VxD CONFIGURATION ♦ DIAL/SECURITY Winmodem users will have access to VxDinformation via these screens. Courier users will have access to Dial/Securityinformation. Click ROM Checksum to bring up thefollowing screen. Technicians us...

U SING M ODEM S TATION 86 The “Configuration” screen displays thefollowing information about your modem. • Product Type displays the informationrelating to the make and model of yourmodem. • Options displays the protocols available toyour modem. • Fax Options displays your fax compatibility. • Clock...

T ROUBLESHOOTING AND O NLINE H ELP R ESOURCES 95 When Plug and Play Fails If you have been directed to this section, yourPlug and Play installation was not successful.Try the following possible solutions: 1. Click Windows 95 Start and click ShutDown. When asked if you wish to shutdown your computer,...

T ROUBLESHOOTING AND O NLINE H ELP R ESOURCES 96 reading to learn about our supportoptions. Online Help Resources Connecting to the 3Com BBS To connect to the 3Com Bulletin BoardSystem, follow these steps: 1. Start the RapidComm Voice program.The software settings for the BBS are: ANSI terminal emul...

T ROUBLESHOOTING AND O NLINE H ELP R ESOURCES 97 The preceding screen shot is what theintroduction screen of the 3Com BBS willlook like. The BBS gives you access tocustomer and technical support documentsand the BBS library which contains hundredsof helpful files and tips to help simplify usingyour ...

T ROUBLESHOOTING AND O NLINE H ELP R ESOURCES 100 call. In order to save both time and expense,you should do the following before calling: 1. Click the Windows 95 Start button. 2. Point to Programs and then clickRapidComm Voice. (If you have notinstalled RapidComm Voice, see thesection title “Softwa...

G LOSSARY 103 Cross references are printed in boldface. Cross references with items in the Command Summary, found in theTechnical Quick Reference (Section D), are printed initalics. analog loopback A modem self-test in which data from the keyboard or aninternal test pattern is sent to the modem's tr...

G LOSSARY 106 data mode Mode used by a modem when sending and receiving datafiles. DCE Data Communications (or Circuit-Terminating)Equipment, such as dial-up modems that establish andcontrol the data link via the telephone network. default Any setting assumed, at startup or reset, by thecomputer's s...

G LOSSARY 107 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 blocks of data. V.42 and MNP error-control protocols use error detection ( CRC) and retransmission of flawe...

G LOSSARY 108 Hz Hertz, a frequency measurement unit used internationallyto indicate cycles per second. ITU-T An international organization that defines standards fortelegraphic and telephone equipment. For example, theBell 212A standard for 1200-bps communication in NorthAmerica is observed interna...

G LOSSARY 109 online fall back/fall forward A feature that allows high-speed, error-control modems tomonitor line quality and fall back to the next lower speedin a defined range if line quality diminishes. As lineconditions improve, the modems switch up to the nexthigher speed. originate mode The mo...

G LOSSARY 110 ROM Read Only Memory. Permanent memory, not user-programmable. serial transmission The consecutive flow of data in a single channel. Compareto parallel transmissions where data flows simultaneouslyin multiple channels. start/stop bits The signaling bits attached to a character before a...

G LOSSARY 111 V.22 bis An ITU-T standard for modem communications at 2400bps. The standard includes an automatic link negotiationfallback to 1200 bps and compatibility with Bell212A/V.22 modems. V.27 ter An ITU-T standard for facsimile operations that specifies modulation at 4800 bps, with fallback ...

G LOSSARY 112 Xmodem The first of a family of error control software protocols used to transfer files between modems. These protocolsare in the public domain and are available from manybulletin board services. XON/XOFF Standard ASCII control characters used to tell anintelligent device to stop/resum...

T ECHNICAL Q UICK R EFERENCE 113 This section includes information about: • AT Command Summary • S-Registers

T ECHNICAL Q UICK R EFERENCE 114 AT Command Summary • Type commands in either upper or lower case, not a combination. Use theBackspace key to delete errors. (You cannot delete the original AT command sinceit is stored in the modem buffer.) • If a command has numeric options and you don’t include a n...

T ECHNICAL Q UICK R EFERENCE 115 Command Set $ Use in conjunction with D, S,or & commands (or just AT)to display a basic commandlist; online help. A Manual Answer: goes off hookin answer mode. Pressing anykey aborts the operations. A/ Re-executes the last issuedcommand. Used mainly toredial. Thi...

T ECHNICAL Q UICK R EFERENCE 116 Sn Dials the phonenumber string stored inNVRAM at position n(n = 0 − 3). Phone numbers are storedwith the &Zn=scommand. T Tone dial , (Comma) Pause, SeeS8 definition; whichit’s linked to. ; (Semicolon) Return toCommand mode afterdialing. “ Dials the letters thatf...

T ECHNICAL Q UICK R EFERENCE 117 Fn Sets online local echo oftransmitted data ON/OFF. F0 Local echo ON.Modem sends a copyof data it sends to theremote system to yourscreen. F1 Local echo OFF.Receiving system maysend a remote echo ofdata it receives. Hn Controls ON/OFF hook. H0 Hangs up (goes onhook)...

T ECHNICAL Q UICK R EFERENCE 118 M n Operates speaker. M0 Speaker always OFF. M1 Speaker ON untilCONNECT. M2 Speaker always ON. M3 Speaker ON after dial,until CONNECT. On Returns online. O0 Returns online. O1 Returns online andretrains. P Sets pulse dial (for phonelines that don’t supporttouch-tone ...

T ECHNICAL Q UICK R EFERENCE 119 Xn Sets result code displayed. Default is X4. Xn Setting Result Codes X0 X1 X2 X3 X4 0/OK • • • • • 1/CONNECT • • • • • 2/RING • • • • • 3/NO CARRIER • • • • • 4/ERROR • • • • • 5/CONNECT 1200 • • • • 6/NO DIAL TONE • • 7/BUSY • • 8/NO ANSWER* • • 9/RESERVED10/CONNEC...

T ECHNICAL Q UICK R EFERENCE 121 Yn Selects power-on/resetdefault configuration. Y0 Default is profile 0setting in NVRAM Y1 Default is profile 1setting in NVRAM Z Resets modem. Z0 Resets modem toNVRAM profileselected by Ycommand or dip 7. Z1 Resets modem toNVRAM profile 0 Z2 Resets modem toNVRAM pro...

T ECHNICAL Q UICK R EFERENCE 122 &A3 Protocol indicatorsadded  LAPM/MNP/NONE(error control) andV42bis/MNP5 (datacompression) &Bn Manages modem’s serialport rate. &B0 Variable, followsconnection rate &B1 Fixed serial port rate &B2 Fixed in ARQ mode,variable in non-ARQmode &Cn...

T ECHNICAL Q UICK R EFERENCE 123 &Gn Sets Guard Tone. &G0 No guard tone, U.S.and Canada &G1 550 Hz guard tone,some Europeancountries, requires B0setting. &G2 1800 Hz guard tone,U.K., requires B0setting. &Hn Sets Transmit Data (TD)flow control (see also &Rn). &H0 Flow cont...

T ECHNICAL Q UICK R EFERENCE 124 &K3 MNP5 compressiondisabled &M n Sets Error Control (ARQ) for connections at 1200 bpsand higher. &M0 Normal mode, errorcontrol disabled &M1 Reserved &M2 Reserved &M3 Reserved &M4 Normal/ARQ &M5 ARQ mode &Nn Sets connect speed. Ifc...

T ECHNICAL Q UICK R EFERENCE 126 &T8 Analog Loopback withself-test and errordetector &Un Sets floor connect speedwhen &Un is set greaterthan 0. &Nn is the ceilingconnect speed. See &Nn. &U0 Disabled &U1 300 bps &U2 1200 bps &U3 2400 bps &U4 4800 bps &U5 72...

T ECHNICAL Q UICK R EFERENCE 127 &Y3 Nondestructive,unexpedited &Zn=s Writes phone number strings to NVRAM at position n(n = 0 − 3). &Zn=L Writes last executed dial string to NVRAM atposition n (n = 0 − 3). &Zn? Displays the phone numberstored at position n (n = 0 − 3). &ZL? Disp...

T ECHNICAL Q UICK R EFERENCE 128 S Registers To change a setting, use the ATSr=n command, where r is the register and n is a decimalvalue from 0 − 255 (unless otherwise indicated). Register Default Function S0 0 Sets the number of rings on which to answer in Auto Answer Mode. When set to0, Auto Answ...

T ECHNICAL Q UICK R EFERENCE 129 Register Default Function S6 2 Sets the number of seconds the modem waits before dialing. If Xn is set to X2 orX4, this is the time-out length if there isn't a dial tone. S7 60 Sets the number of seconds the modem waits for a carrier. May be set for muchlonger durati...

T ECHNICAL Q UICK R EFERENCE 130 Register Default Function S10 (cont.) A better alternative is to ask your phone company how to temporarily disable callwaiting (usually *70W). For example: ATDT *70W phone number. Note: If you set S10 = 255, the modem will not hang up when carrier is lost.Dropping DT...

T ECHNICAL Q UICK R EFERENCE 131 Register Default Function S13 (cont.) Bit Value Result 4 16 At power on/reset, Auto Dial the number stored inNVRAM at position 0. 5 32 Reserved 6 64 Disable quick retrains. 7 128 Disconnect on escape code. * The 1.5K-byte non-ARQ buffer allows data transfer with Xmod...

T ECHNICAL Q UICK R EFERENCE 133 Register Default Function S22 17 Stores the ASCII decimal code for the XON character. S23 19 Stores the ASCII decimal code for the XOFF character. S25 20 Sets the duration, in hundredths of a second, that DTR must be dropped so that themodem doesn’t interpret a rando...

T ECHNICAL Q UICK R EFERENCE 136 Register Default Function S34 (cont.) Bit Value Result 2 4 Disable 32S-2D trellis encoding. 3 8 Disable 64S-4D trellis encoding. 4 16 Disable non-linear coding. 5 32 Disable TX level deviation. 6 64 Disable Pre-emphasis. 7 128 Disable Pre-coding. S35 0 Bit-mapped reg...

T ECHNICAL Q UICK R EFERENCE 137 Register Default Function S38 0 Sets an optional delay, in seconds, before a forced hang-up and clearing of theTransmit buffer when DTR drops during an ARQ call. This allows time for aremote modem to acknowledge receipt of all transmitted data before it isdisconnecte...

R EGULATORY I NFORMATION 138 Manufacturer’s Declarationof Conformity 3Com7770 North Frontage RoadSkokie, Illinois 60077-2690U.S.A. declares that the product U.S. RoboticsSportster Voice 33600 Internal Faxmodemconforms to the FCC’s specifications: Part 15, Class B:Operation is subject to the followin...

R EGULATORY I NFORMATION 139 This equipment uses the following USOCjacks: RJ-11C. This equipment may not be used on coinservice provided by the telephone company.Connection to party lines is subject to statetariffs. An FCC compliant telephone cord andmodular plug are provided with this equipment,whi...

R EGULATORY I NFORMATION 140 Connecting to the Telephone Company It is not necessary to notify the telephonecompany before installing the modem.However, the telephone company mayrequest the telephone number(s) to which theSportster modem is connected and thedeclaration of conformity to FCC Parts 15a...

R EGULATORY I NFORMATION 141 your modem. If you’re using a differentcommunications software program, refer to itsmanual. Radio and Television Interference This equipment generates and uses radiofrequency energy and if not installed and usedproperly, in strict accordance with themanufacturer’s instru...

R EGULATORY I NFORMATION 142 How to Identify and Resolve Radio-TV Interference ProblemsStock No. 004-000-0345-4U.S. Government Printing OfficeWashington, DC 20402 In accordance with Part 15 of the FCC rules,the user is cautioned that any changes ormodifications to the equipment described inthis manu...

R EGULATORY I NFORMATION 145 ensemble. Cette précaution estparticulièrement importante dans les régionsrurales.Avertissement: L'utilisateur ne doit pas tenterde faire ces raccordements lui même; il doitavoir recours à un service d'inspection desinstallations électriques, ou à un électricien,selon le...

INDEX 148 A America Online, U.S. Robotics online supportand, 99 analog phone lines, vs. digital, 15, 24AOL. See America Online, U.S. Roboticsonline support and B BBS, 3Com, 96-98 C characters per second (cps) low, errors and, 93-94 COM ports conflicts, 89-90and Plug and Play installations, 19-20 Com...

Index 149 I IRQs, 1, 3-12, 20 conflicts, 89-90 ISA expansion slots, 14, 22 J jumper pins, 10-12, 20jumper shunts, 10-12, 20 M microphone installation, 16, 24modem installation Plug and Play, 19-32With Windows 3.x, 3-18 Modem Update Wizard, 53-64 installing, 53-57using, 58-64 O online help resources,...

Index 150 T Technical Support Hotline, 99terminal mode, 96, 99Terminate and Stay Resident programs, errorsand, 93, 94 troubleshooting, 89-94 RapidComm Voice software, 101-102 TSR. See Terminate and Stay Residentprograms U upgrading/updating modems, 53-64 V V.17 fax transmissions, errors and, 94 W Wi...