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US Robotics 005689-03, Manual

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Welcome to x2

Welcome to x2

 Information Access

 Information Access

3

The latest breakthrough in

The latest breakthrough in

online communications

online communications

Until now, 33.6 Kbps was thought to be the
practical limit for speed over standard phone
lines. Now, U.S. Robotics shatters that
barrier, to bring you download speeds of up
to 56 Kbps. However, due to FCC rules

which restrict power output of your service
provider’s modems, current download
speeds are limited to 53Kbps. This modem
is software upgradable, allowing easy
upgrades to new features and enhancements
when they become available.

An integrated end-to-end

An integrated end-to-end

solution from the leader

solution from the leader

U.S. Robotics is well positioned to bring
you x2 technology. Our Sportster

®

 modems

are the world's number one seller, and our
Total Control

TM

 and Courier

TM

 product lines

are favored by many Internet service
providers. This widespread acceptance
allows U.S. Robotics to offer x2 technology
to virtually anyone.

Summary of Contents for 005689-03

Page 1: ...le Computer Inc MacComCenter is a trademark of Smith Micro Software Inc America Online is a registered trademark of America Online Inc CompuServe is a registered trademark of CompuServe Inc Other trademarks trade names and service marks owned or registered by any other company and used in this manual are the property of their respective companies 1997 U S Robotics 7770 North Frontage Road Skokie I...

Page 2: ...ss 1 Welcome to x2 Information Access 3 Features 5 Installation 7 Software and Registration 11 U S Robotics Online for Mac Users 13 Troubleshooting 17 Glossary 23 Technical Quick Reference 35 Front Panel Lights 36 Command Summary 37 S Registers 50 Regulatory Information 59 Limited Warranty 69 ...

Page 3: ... our new x2 technology As an innovator in the data communications field U S Robotics has a history of bringing the latest technology to market at an affordable price U S Robotics owns the core technology known as the data pump that works in its access products This allows U S Robotics to bring new technologies and features to market faster and at a lower cost while passing the savings on to you Be...

Page 4: ...of your service provider s modems current download speeds are limited to 53Kbps This modem is software upgradable allowing easy upgrades to new features and enhancements when they become available An integrated end to end An integrated end to end solution from the leader solution from the leader U S Robotics is well positioned to bring you x2 technology Our Sportster modems are the world s number ...

Page 5: ... of the available 64K network bandwidth Upstream data typically less speed sensitive travels at the standard V 34 rate The result is a completely new kind of transmission technique Based on encoding rather than modulation it can give you download speeds that you never thought possible What s more with standard V 42 bis compression x2 can download at speeds up to a blistering 115 2 Kbps The new sta...

Page 6: ...h allow you to connect to other modems across the globe These standards include V 34 V 32 bis V 32 V 22 bis Bell 212A V 22 V 23 V 25 and Bell 103 V 21 modems To send data faster and more efficiently your modem uses hardware based V 42 MNP 2 4 error control and V 42 bis MNP 5 data compression Fax Capability Fax Capability Your modem is compatible with Class 1 or Class 2 0 fax software included in y...

Page 7: ...his package modem RJ11 standard phone cord power adapter serial connecting cable this guide 2 Not with this package analog standard phone jack Install your modem 1 Turn off your computer 2 Firmly attach the enclosed serial connecting cable to both the modem and the port on the back of your computer marked with a telephone icon ...

Page 8: ...n the back of your modem Once your modem is connected you ll need to install the MacComCenter software included with your modem This allows you to send and receive faxes surf the Internet call an online service to access e mail or call a local bulletin board BBS For more information on installing For more information on installing the communications software and the communications software and oth...

Page 9: ...aking Cable Pin Hardware Handshaking Cable Pin Assignments Assignments Mini DIN 8 DB 25 Connector Handshake Output HSKo 1 4 RTS 20 DTR Handshake Input HSKi 2 5 CTS Transmit Data TXD 3 2 TXD Ground GND 4 7 GND Receive Data RXD 8 7 GND Receive Data RXD 5 3 RXD Transmit Data TXD 6 not connected Gen Purpose Input GPI 7 not connected Note The Handshake Output pin is connected to both pins 4 RTS and 20 ...

Page 10: ...efer to the electronic MacComCenter user s guide on your Connections CD for details about operating the software NOTE ARA scripts install along with MacComCenter Follow these steps to Follow these steps to install MacComCenter install MacComCenter 1 Quit all other applications 2 Insert the Connections CD ROM into your CD ROM drive 3 Double click on the U S Robotics Connections icon 4 Follow the on...

Page 11: ...end you fill out the enclosed registration card and send it back to us Registering your modem allows you to automatically receive priority notification of new product releases product upgrades and other special services for registered users ...

Page 12: ... 2 Enter the following command ATDT 1 847 676 1598 If you get a busy signal use the A command to redial the number 3 Once you are connected type MMM 4 Next select the Download TeleFinder User for Macintosh option from the menu This downloads special software used when logging onto the Macintosh BBS at U S Robotics Using TeleFinder to access the Using TeleFinder to access the Macintosh BBS at U S R...

Page 13: ...to the Macintosh BBS at U S Robotics From here you can download technical reference manuals or learn more about U S Robotics by clicking on the various icons Other U S Robotics Support Other U S Robotics Support Sites and Services Sites and Services Internet FTP Provides a free library containing the same files as the BBS site FTP to ftp usr com Internet On Demand Provides automatic technical supp...

Page 14: ...p Call 800 762 6163 toll free in the U S and Canada International callers dial 847 676 8536 CompuServe Connect through the Modem Vendor Forum or e mail us through CompuServe Mail for a response within 24 hours Modem vendor forum address is GO USROBOTICS Modem Vendor Section 4 Address message to 76711 707 Send messages directly to us through CompuServe Mail at 76711 707 America Online Connect to U ...

Page 15: ... fax or by live technical support representatives Fax Fax 847 676 7323 The fax machine can receive faxes 24 hours a day Technical Support Technical Support 847 982 5151 8 00 a m 6 00 p m Mon Fri Central time Priority No Hold Service Priority No Hold Service 900 555 USR1 8 00 a m 6 00 p m Mon Fri Central time ...

Page 16: ...e modem by typing ATEO enter in your software s terminal mode To turn the local echo off in the software refer to your software s documentation If your modem doesn t dial a If your modem doesn t dial a number or doesn t answer the number or doesn t answer the phone phone Make sure the phone cord is connected to the jack on the modem labeled TELCO and to a phone jack Review your software documentat...

Page 17: ...e following command in terminal mode AT M0 Enter and place the call again If your modem doesn t connect at If your modem doesn t connect at 2400 bps with a 2400 bps modem 2400 bps with a 2400 bps modem The remote modem might be an older 2400 bps modem that does not support error control Disable error control with the following command AT M0 Enter and try connecting again When the call is finished ...

Page 18: ...ters Per low Characters Per Second CPS Second CPS You might have a bad phone line Place the call again The phone company routes calls differently each time you call Type the following command to load the template that enables hardware flow control and optimal settings AT F1 D0 Enter Lower the serial port rate in your communications software to 38 400 bps or 19 200 bps Try a different file transfer...

Page 19: ...ler cannot help you and you cannot access the online support sites please contact U S Robotics Customer Support When you call please have your modem s serial number found on the modem and on the outside of the box the name of the software being used and if possible the contents of your ATI7 screen ready USR Mac BBS 847 676 1598 Fax On Demand 800 762 6163 CompuServe GO USROBOTICS America Online key...

Page 20: ...21 Internet FTP ftp usr com ...

Page 21: ...sentative has determined that you need to return the modem they will give you a Service Request Order SRO number Ship the unit postage paid in a strong box made of corrugated cardboard with plenty of packing material Include your SRO number name and address on the shipping label as well as inside the package Ship to the following address U S Robotics U1 Receiving SRO U S Robotics Access Corp 8100 ...

Page 22: ... 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 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 Application A computer program desi...

Page 23: ...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 Baud Rate Baud Rate A term used to measure the speed of an analog transmission from one point to another Although not technically accurate baud rate is commonly used to mean bit rate Binary Digit Binary Digit A 0 or 1 reflecting the use of the binary numbering system onl...

Page 24: ...rs 1 kilobyte KB is equal to 1 024 bytes or characters 640 KB indicates 655 360 bytes or characters Carrier Carrier A tone signifying a connection the modem can alter to communicate data across telephone lines Character Character A representation coded in binary digits of a letter number or other symbol Characters Per Second CPS Characters Per Second CPS A data transfer rate generally estimated fr...

Page 25: ...ons Data Communications A type of communications in which computers are able to exchange data over an electronic medium Data Compression Table Data Compression Table A table containing values assigned for each character during a call under MNP5 data compression Default values in the table are continually altered and built during each call the longer the table the more efficient throughput gained D...

Page 26: ...ital signals from the computer or terminal and immediately returns the data to the screen for verification Digital Signals Digital Signals Discrete uniform signals In this manual the term refers to the binary digits 0 and 1 Contrast with analog signals DTE DTE Data Terminal or Terminating Equipment A computer that generates or is the final destination of data Duplex Duplex Indicates a communicatio...

Page 27: ...r device See commands Hn In and Rn Frame Frame A data communications term for a block of data with header and trailer information attached The added information usually includes a frame number block size data error check codes and Start End indicators Full Duplex Full Duplex Signal flow in both directions at the same time In microcomputer communications may refer to the suppression of the online L...

Page 28: ...most U S manufacturers observe V 22 bis The initials ITU T represent the French name in English it s known as the International Telegraph and Telephone Consultative Committee LAPM 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...

Page 29: ...rammable 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 OFF ON Hook Modem operations that are the equivalent of manually lifting a phone receiver taking it off hook and replacing it going on hook Online Fallback Fall Forward Online Fallback Fall Forward A feature that allows high speed e...

Page 30: ...he data readiness to receive or send error detection and error correction are some of the operations that may be defined in protocols RAM RAM Random access memory Memory that is available for use when the modem is turned on but that clears all information when the power is turned off The modem s RAM holds the current operational settings a flow control buffer and a command buffer Remote Digital Lo...

Page 31: ...little or no internal processing capabilities Terminal Mode Terminal Mode Software mode that allows direct communication with the modem Also known as command mode Throughput Throughput The amount of actual user data transmitted per second without the overhead of protocol information such as Start and Stop bits or frame headers and trailers Compare with characters per second V 8 V 8 The portion of ...

Page 32: ...ps V 29 V 29 A ITU T standard for facsimile operations that specifies modulation at 9600 bps with fallback to 7200 bps V 32 V 32 A ITU T standard for modem communications at 9600 bps and 4800 bps V 32 modems fall back to 4800 bps when line quality is impaired V 32 bis V 32 bis A 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 ...

Page 33: ...d are available from many bulletin board services XON XOFF XON XOFF Standard ASCII control characters used to tell an intelligent device to stop resume transmitting data Ymodem 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 error checking Ymodem G Ymodem G Similar to Ymodem except it includes ...

Page 34: ...35 Technical Quick Reference The Quick Reference appendix includes information about Front Panel Lights Command Summary S Registers ...

Page 35: ...ed Data Flashes when modem sends result codes or passes received data bits from remote SD Send Data Flashes when computer sends a data bit to modem TR Data Terminal Ready ON if modem receives a DTR signal from computer Always ON modem ignores DTR if the DTR override is ON D0 CS Clear to Send ON until modem lowers CTS when Transmit Data hardware flow control is enabled H1 H3 ARQ Error Control Data ...

Page 36: ...tions and you don t include a number zero is assumed For example if you type ATB the command ATB0 is assumed Every command except A and must begin with the AT prefix and be entered by pressing Enter The maximum command length is 58 characters The modem doesn t count the AT prefix carriage returns or spaces Note All defaults are based on the F1 Hardware Flow Control template loaded in NVRAM when th...

Page 37: ...d command prefix except with A and Use alone to test for OK result code Bn U S ITU T answer sequence B0 ITU T answer sequence B1 U S answer tone Dn Dials the specified phone number Includes the following L Dials the last dialed number P Pulse rotary dial R Originates call using answer reverse frequencies Sn Dials the phone number string stored in NVRAM at position n n 0 3 Phone numbers are stored ...

Page 38: ... Fn Sets online local echo of transmitted data ON OFF F0 Local echo ON Modem sends a copy of data it sends to the remote system to your screen F1 Local echo OFF Receiving system may send a remote echo of data it receives Hn Controls ON OFF hook H0 Hangs up goes on hook H1 Goes off hook In Displays the following information I0 Four digit product code I1 Results of ROM checksum I2 Results of RAM che...

Page 39: ...eturns online and retrains P Sets pulse dial for phone lines that don t support touchtone dialing Qn Displays suppresses result codes Q0 Displays result codes Q1 Quiet mode no result codes Q2 Displays result codes only in Originate mode Sr b n Sets bit b of register r to n 0 OFF or 1 ON Sr n Sets register r to n Sr Displays contents of S Register r S Displays a list of the S Registers T Sets tone ...

Page 40: ...RING 3 NO CARRIER 4 ERROR 5 CONNECT 1200 6 NO DIAL TONE 7 BUSY 8 NO ANSWER 10 CONNECT 2400 11 RINGING 13 CONNECT 9600 18 CONNECT 4800 20 CONNECT 7200 21 CONNECT 12000 25 CONNECT 14400 43 CONNECT 16800 85 CONNECT 19200 91 CONNECT 21600 99 CONNECT 24000 103 CONNECT 26400 107 CONNECT 28800 151 CONNECT 31200 ...

Page 41: ... CONNECT 42666 196 CONNECT 44000 200 CONNECT 45333 204 CONNECT 46666 208 CONNECT 48000 212 CONNECT 49333 216 CONNECT 50666 220 CONNECT 52000 224 CONNECT 53333 228 CONNECT 54666 232 CONNECT 56000 236 CONNECT 57333 Adaptive Dialing Wait for 2nd Dial Tone W Wait for Answer Fast Dial Requires in dial string replaces NO CARRIER ...

Page 42: ...ile 0 F0 Z4 Resets modem to factory default profile 1 F1 Z5 Resets modem to factory default profile 2 F2 Displays a list of ampersand commands An Enables disables additional result code subsets see Xn A0 ARQ result codes disabled A1 ARQ result codes enabled A2 V 32 modulation indicator added A3 Protocol indicators added LAPM MNP NONE error control and V42bis MNP5 data compression Bn Manages modem ...

Page 43: ...c template F1 Hardware flow control template F2 Software flow control template Gn Sets Guard Tone G0 No guard tone U S and Canada G1 550 Hz guard tone some European countries requires B0 setting G2 1800 Hz guard tone U K requires B0 setting Hn Sets Transmit Data TD flow control see also Rn H0 Flow control disabled H1 Hardware flow control Clear to Send CTS H2 Software flow control XON XOFF H3 Hard...

Page 44: ...ls in a Hewlett Packard system that uses the ENQ ACK protocol Use in ARQ mode only I5 This setting is designed to enable flow control on the phone link when the connection is not under error control For this to work for you the remote modem must have I5 capability Kn Enables disables data compression K0 Data compression disabled K1 Auto enable disable K2 Data compression enabled K3 MNP5 compressio...

Page 45: ...bps N13 26 400 bps N14 28 800 bps N15 31 200 bps N16 33 600 bps N17 33 333 bps N18 37 333 bps N19 41 333 bps N20 42 666 bps N21 44 000 bps N22 45 333 bps N23 46 666 bps N24 48 000 bps N25 49 333 bps N26 50 666 bps N27 52 000 bps N28 53 333 bps N29 54 666 bps N30 56 000 bps N31 57 333 bps Pn Sets pulse rotary dial make break ratio P0 U S Canada ratio 39 61 P1 U K ratio 33 67 Rn Sets Receive Data RD...

Page 46: ...emote Digital with self test and error detector T8 Analog Loopback with self test and error detector Un Sets floor connect speed when Un is set greater than 0 Nn is the ceiling connect speed See Nn U0 Disabled U1 300 bps U2 1200 bps U3 2400 bps U4 4800 bps U5 7200 bps U6 9600 bps U7 12 000 bps U8 14 400 bps U9 16 800 bps U10 19 200 bps U11 21 600 bps U12 24 000 bps U13 26 400 bps U14 28 800 bps U1...

Page 47: ...ng Y0 Destructive but doesn t send break Y1 Destructive expedited Y2 Nondestructive expedited Zn s Writes phone number string s to NVRAM at position n n 0 3 Zn L Writes last executed dial string to NVRAM at position n n 0 3 Zn Displays the phone number stored at position n n 0 3 ZL Displays the last executed dial string CID n Controls Caller ID feature CID 0 Caller ID disabled CID 1 Caller ID enab...

Page 48: ... the escape code S3 13 Stores the ASCII code for the Carriage Return character Valid range is 0 127 S4 10 Stores the ASCII decimal code for the Line Feed character Valid range is 0 127 S5 8 Stores the ASCII decimal code for the Backspace character A value of 128 255 disables the Backspace key s delete function S6 2 Sets the number of seconds the modem waits before dialing If Xn is set to X2 or X4 ...

Page 49: ...necting the modem to a line with call waiting if you have it you may wish to adjust this setting upward to prevent the modem from misinterpreting the second call signal as a disconnect by the remote modem A better alternative is to ask your phone company how to temporarily disable call waiting usually 70W For example ATDT 70W phone number Note If you set S10 255 the modem will not hang up when car...

Page 50: ...set Auto Dial the number stored in NVRAM at position 0 5 32 Reserved 6 64 Disable quick retrains 7 128 Disconnect on escape code The 1 5K non ARQ buffer allows data transfer with Xmodem and Ymodem type file transfer protocols without using flow control The 128 byte option lets remote users with slower modems keep data you re sending from scrolling off their screens When remote users send your comp...

Page 51: ...isable ARQ MNP V 32 V 32bis V 32terbo 3 8 Disable MNP handshake 4 16 Disable MNP level 4 5 32 Disable MNP level 3 6 64 MNP incompatibility 7 128 Disable V 42 operation 8 136 Disable V 42 detect phase The sum of the values of bits 3 and 7 S16 0 Bit mapped register setup To set the register see instructions for S13 Bit Value Result 0 1 Reserved 1 2 Touch tone dialing test 2 7 4 128 Reserved S17 0 Re...

Page 52: ...sables the timer S20 0 Reserved S21 10 Sets the length in 10 millisecond units of breaks sent from the modem to the computer applies to MNP or V 42 mode only S22 17 Stores the ASCII decimal code for the XON character S23 19 Stores the ASCII decimal code for the XOFF character S24 0 Reserved S25 20 Sets the duration in hundredths of a second that DTR must be dropped so that the modem doesn t interp...

Page 53: ...ables 2100 Hz answer tone to allow two V 42 modems to connect faster 4 16 Enables V 23 fallback mode 5 32 Disables V 32bis mode 6 64 Disable V 42 selective reject 7 128 Software compatibility mode This setting disables the codes and displays the 9600 code instead The actual rate of the call can be viewed on the ATI6 screen Used for unusual software incompatibilities Some software may not accept 72...

Page 54: ...128 Reserved S32 2 Connection bit mapped operations Stores various modulation and call control flags default 0 To set the register see the instructions for S13 Bit Value Result 0 1 V 8 Call Indicate enabled 1 2 Enables V 8 mode 2 4 Reserved 3 8 Disable V 34 modulation 4 16 Disable 33 6 kbps support 5 32 Disable x2 6 7 32 128 Reserved ...

Page 55: ... 16 Disable 3200 symbol rate 5 32 Disable 3429 symbol rate 6 64 Reserved 7 128 Disable shaping S34 0 V 34 and V 34 connection setup bit mapped control flags default 0 To set registers see instructions for S13 Bit Value Result 0 1 Disable 8S 2D trellis encoding 1 2 Disable 16S 4D trellis encoding 2 4 Disable 32S 2D trellis encoding 3 8 Disable 64S 4D trellis encoding 4 16 Disable non linear coding ...

Page 56: ...modem to acknowledge receipt of all transmitted data before it is disconnected The modem immediately hangs up when DTR drops This option only applies to connections terminated by dropping DTR If the modem receives the ATH command it ignores S38 and immediately hangs up S41 0 Bit mapped register setup To set registers see instructions for S13 Bit Value Result 0 1 Enable distinctive ring reporting 1...

Page 57: ...oduct Sportster 56K Faxmodem for Macintosh computers model 1789 conforms to the FCC s specifications Part 15 Operation is subject to the following two conditions 1 this device may not cause harmful electromagnetic interference and 2 this device must accept any interference received including interference that may cause undesired operations Part 68 This equipment uses the following USOC jacks RJ11C...

Page 58: ...tled Digital Apparatus ICES 003 of Industry Canada Cet appareil numérique respecte les limites de bruits radioélectriques applicables aux appareils numériques de Classe B préscrites dans la norme sur le matériel brouilleur Appareils Numériques NMB 003 édictée par l Industrie Canada UL Listing CUL Listing UL Listing CUL Listing This information technology equipment is UL listed and CUL Listed for u...

Page 59: ... telephone company before installing the modem However the telephone company may request the telephone number s to which the Sportster is connected and the FCC information printed on pages 59 60 Be sure that the telephone line you are connecting the modem to is a standard analog line and not a digital PBX party or coin telephone line If the modem is malfunctioning it may affect the telephone lines...

Page 60: ...d time it is sent an identification of the business or other entity or other individual sending the message and the telephone number of the sending machine or of such business other entity or individual The telephone number provided may not be a 900 number or any other number for which charges exceed local or long distance transmission charges In order to program this information into your Sportst...

Page 61: ...provide reasonable protection against such interference in 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 o...

Page 62: ...ly approved by U S Robotics Inc could void the user s authority to operate the equipment For Canadian Modem Users For Canadian Modem Users NOTICE The Industry Canada IC label identifies certified equipment This certification means the equipment meets certain telecommunications network protective operational and safety requirements as prescribed in the appropriate Terminal Equipment Technical Requi...

Page 63: ...r Any repairs or alterations made by the user to this equipment or equipment malfunctions may give the telecommunications company cause to request the user to disconnect the equipment For your own protection make sure that the electrical ground connections of the power utility telephone lines and internal metallic water pipe system if present are connected together This precaution may be particula...

Page 64: ...ivant Equipment Technical Requirements Toutefois le Ministère ne guarantie pas que le matériel fonctionnera à la satisfaction de l utilisateur Avant d installer ce matériel l utilisateur doit s assurer qu il est permis de le raccorder aux installations de l entreprise locale de télécommunications Le matériel doit également être installé en suivant une méthode acceptée de raccordement Dans certains...

Page 65: ...t Pour sa propre protection l utilisateur doit s assurer que tous les fils de mise à la terre de la source d énergie électrique des lignes téléphoniques et des canalisations d eau métalliques s il y en a sont raccordés ensemble Cette précaution est particulièrement importante dans les régions rurales AVERTISSEMENT L utilisateur ne doit pas tenter de faire ces raccordements lui même il doit avoir r...

Page 66: ...68 REN ____________ Centre de guarantie et de service après vente adresse et numéro de téléphone ...

Page 67: ...limited to lightning and water damage THIS LIMITED WARRANTY DOES NOT GUARANTEE YOU UNINTERRUPTED SERVICE REPAIR OR REPLACEMENT AS PROVIDED UNDER THIS LIMITED WARRANTY IS THE EXCLUSIVE REMEDY OF THE PURCHASER THIS LIMITED WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE OR PURPOSE U S ...

Page 68: ... Support Department at 847 982 5151 or by mail at U S Robotics 7770 N Frontage Road Attn Technical Support Dept Skokie Illinois 60077 2690 You will be given a Service Repair Order SRO number to help U S Robotics keep track of your limited warranty request Once you have received your SRO number take or send the product postage prepaid and insured to U S Robotics at 8100 N McCormick Blvd U1 Receivin...

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