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MINIMODEM USB

Appendix B: Loopback Tests

B.1 Introduction

Each time you turn on your modem, it performs an
automatic self-test to ensure proper operation. Your
modem also has three diagnostic tests: local analog
loopback, remote digital loopback, and local digital
loopback. These ITU-T V.54 loopback tests isolate
telephone circuit and transmission problems.

In a loopback test, data from your computer loops

through the circuits of your modem and/or a remote
modem before it appears on your monitor. When the
loop has been completed, the data on your PC’s
monitor should match the original data.

The local analog loopback test allows you to verify that

the modem’s transmitter and receiver circuits are
functioning properly.

The local digital loopback allows you to verify that the

local computer or terminal, the two modems, and the
transmission line between them are functioning
properly.

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Содержание MiniModem USB

Страница 1: ...S Call 877 877 BBOX outside U S call 724 746 5500 FREE technical support 24 hours a day 7 days a week Call 724 746 5500 or fax 724 746 0746 Mailing address Black Box Corporation 1000 Park Drive Lawre...

Страница 2: ...operated in a commercial environment Operation of this equipment in a residential area is likely to cause interference in which case the user at his own expense will be required to take whatever measu...

Страница 3: ...onnected until the source of the problem can be determined and until the repair has been made If this is not done the telephone company may temporarily disconnect service 3 If you have problems with y...

Страница 4: ...FCC label The ringer equivalence number REN is used to determine how many devices can be connected to your telephone line In most areas the sum of the RENs of all devices on any one line should not ex...

Страница 5: ...o o cerca de una alberca etc 6 El aparato el ctrico debe ser usado nicamente con carritos o pedestales que sean recomendados por el fabricante 7 El aparato el ctrico debe ser montado a la pared o al t...

Страница 6: ...contactos y recept culos donde salen del aparato 14 El equipo el ctrico debe ser limpiado nicamente de acuerdo a las recomendaciones del fabricante 15 En caso de existir una antena externa deber ser l...

Страница 7: ...echnologies Corporation Microsoft Windows Windows 95 and Windows NT are either registered trademarks or trademarks of Microsoft Corporation in the United States and other countries NOTICE Though these...

Страница 8: ...2 1 We Supply 19 3 2 2 You Supply 20 3 3 Safety Warnings 20 3 4 Step 1 Assemble the Modem 21 3 5 Step 2 Connect the Modem to Your System 22 3 5 1 USB Connection 23 3 5 2 Line Connection 23 3 5 3 Phon...

Страница 9: ...nnecting to the Computer USB 33 4 3 2 Connecting to the Telephone Line LINE 34 4 3 3 Connecting to a Telephone Set PHONE 34 4 3 4 Surge Protectors and Lightning 35 4 4 Front Panel 35 5 AT Commands S R...

Страница 10: ...m Dials But Cannot Connect 83 7 5 The Modem Disconnects While Online 87 7 6 The Modem Cannot Connect When Answering 88 7 7 The Modem Doesn t Work with Caller ID 88 7 8 Fax and Data Software Can t Run...

Страница 11: ...ce 95 A 7 New Zealand Telecom Warning Notice 97 Appendix B Loopback Tests 98 B 1 Introduction 98 B 2 Local Analog Loopback Test V 54 Loop 3 99 B 3 Remote Digital Loopback Test V 54 Loop 2 101 B 4 Loca...

Страница 12: ...600 19 200 16 800 14 400 12 000 9600 7200 4800 2400 1200 0 300 bps Fax Data Rates 14 400 9600 7200 4800 2400 300 bps Data Format Serial binary asynchronous Modem Capability K56flex ITU T V 90 V 34 enh...

Страница 13: ...requency during start up retrain and rate regeneration DTMF detection call status display auto parity and data rate selections keyboard controlled modem options non volatile memory on screen displays...

Страница 14: ...212A Standard 2400 and 1200 bps Transmit originate 1200 Hz Transmit answer 2400 Hz Receive originate 2400 Hz Receive answer 1200 Hz ITU T V 23 1200 bps Transmit originate 390 Hz mark 450 Hz space Rece...

Страница 15: ...Ch2 half duplex 1650 Hz mark 1850 Hz space for transmit originate 1650 Hz mark 1850 Hz space for transmit answer V 27ter 1800 Hz originate answer V 29 QAM 1800 Hz originate answer V 17 TCM 1800 Hz ori...

Страница 16: ...tics Power on self test local analog loop local digital loop remote digital loop Indicators LEDs for Transmit Data Receive Data Carrier Detect Off Hook Terminal Ready Power Operating Temperature 32 to...

Страница 17: ...data downstream from the Internet to your computer at these speeds because data on the telephone network typically is converted from digital to analog only once before it reaches your modem Upstream...

Страница 18: ...nners all from a single personal computer port The specification based on an open architecture is quickly becoming a standard feature in new desktop and notebook computers 2 3 What the Package Include...

Страница 19: ...18 MINIMODEM USB 1 installation diskette This user s manual Trio data fax and voice software...

Страница 20: ...for now and show you step by step how to set it up check it out and make your first calls 3 2 What You Will Need Before starting please make sure you have everything you need 3 2 1 WE SUPPLY 1 USB dat...

Страница 21: ...n about the required equipment 3 3 Safety Warnings Never install telephone wiring during a lightning storm Never install a telephone jack in a wet location unless the jack is specifically designed for...

Страница 22: ...the bottom of the modem Simply peel the four self adhesive plastic feet off the backing strip and press them into the recesses on the bottom of the modem Alternately or additionally you can use the i...

Страница 23: ...g the feet 3 5 Step 2 Connect the Modem to Your System Placing the modem in a convenient location connect it to your computer s USB port to the telephone line and optionally to your telephone Figure 3...

Страница 24: ...end into a phone line wall jack NOTE The LINE jack is not interchangeable with the PHONE jack Do not plug the phone into the LINE jack or the line cable into the PHONE jack The Federal Communications...

Страница 25: ...y done so connect one end of your USB cable to a USB connector on your PC and connect the other end to the USB connector on your modem The Power LED on your modem will light 3 Windows will detect that...

Страница 26: ...TR LED on your modem will light when the installation is complete 3 6 2 INSTALLATION IN WINDOWS 95 Only certain versions of Windows 95 support USB peripherals If your computer came with a USB port yo...

Страница 27: ...is present and launch the Update Device Driver Wizard Click Next to proceed with the installation 4 Windows searches for the driver on A and when identified will display the driver name for verificati...

Страница 28: ...ndows 95 98 applications Although you can change the application connection descriptions one at a time it s easier to force Windows applications to use the new modem by removing the old modem from Win...

Страница 29: ...s on how to test the modem s fax functions 3 9 References The World Wide Web is an excellent source of information about modems in general and modem installation configuration and troubleshooting The...

Страница 30: ...modem work at home while communicating with the office by modem or fax And you can use your modem to exchange faxes with any fax machine in the world enabling you to communicate quickly with business...

Страница 31: ...upports asynchronous data rates at 56 33 6 31 2 28 8 26 4 24 21 6 19 2 16 8 14 4 and 12 kbps and 9600 4800 2400 1200 and 300 bps Supports automatic fallback to slower speeds in noisy line conditions a...

Страница 32: ...to communicate with other fax modems as well as with fax machines Responds to EIA TIA Class 1 and 2 fax commands enabling it to exchange editable and encrypted faxes with Windows 95 computers Sends an...

Страница 33: ...an extension If you want a separate line for your modem you must contact your telephone company Communications Software To operate your modem you must have data communications and fax software include...

Страница 34: ...o your computer USB to a telephone line LINE and optionally to a telephone set PHONE Figure 4 1 USB and communications connectors 4 3 1 CONNECTING TO THE COMPUTER USB Using a USB cable connect the USB...

Страница 35: ...sion FCC Industry Canada and other regulatory agencies impose certain restrictions on equipment connected to public telephone systems See Appendix A for more information 4 3 3 CONNECTING TO A TELEPHON...

Страница 36: ...electrical storm your safest course is to unplug your computer equipment from both the power outlet and the telephone line 4 4 Front Panel Figure 4 2 Front panel The MiniModem has six LED indicators o...

Страница 37: ...n when the modem is communicating with the other modem and off when the link is broken OH Off Hook The OH LED lights when the modem is off hook which occurs when the modem is dialing online or answeri...

Страница 38: ...nt to know about the modem s internal command language read this chapter 5 1 AT Commands AT commands are used to control the operation of your modem They are so called because each command must be pre...

Страница 39: ...odem you must use a communications program such as HyperTerminal in Windows 95 98 and NT 4 0 or the communications program included with your modem You can issue commands to the modem either directly...

Страница 40: ...OK ERROR and the CONNECT messages that the modem sends to the computer when it is connecting to another modem For a table of valid result codes see Section 5 4 You can issue several commands in one l...

Страница 41: ...xcept A and escape sequences Command ENTER Key Values n a Description Press the Return key to execute most commands Command A Answer Values n a Description Answer call before final ring Command A Repe...

Страница 42: ...select V 23 reverse channel same as B3 B3 Deselect V 23 reverse channel same as B2 B15 Select V 21 when the modem is at 300 bps B16 Select Bell 103J when the modem is at 300 bps Command Cn Carrier Con...

Страница 43: ...d D characters and the L P T V W S comma semicolon and dial string modifiers L Redial last number Must be placed immediately after ATD P Pulse dial following numbers in command T Tone dial following n...

Страница 44: ...n off hook again Wait for quiet answer Causes modem to wait for a ringback then 5 seconds of silence before processing next part of command If silence is not detected the modem returns a NO ANSWER cod...

Страница 45: ...3 Command En Echo Command Mode Characters Values n 0 or 1 Default 1 Description E0 Do not echo keyboard input to the terminal E1 Do echo keyboard input to the terminal Command Fn Echo Online Data Char...

Страница 46: ...ion I0 Display default speed and controller firmware version I1 Calculate and display ROM checksum for example 12AB I2 Check ROM and verify the checksum displaying OK or ERROR I3 Display default speed...

Страница 47: ...ression number of past retrains etc Command Ln Monitor Speaker Volume Values n 0 1 2 or 3 Default 2 Description L0 Select low volume L1 Select low volume L2 Select medium volume L3 Select high volume...

Страница 48: ...ndshake only at communication standard specified by S37 and the B command N1 Modem begins handshake at communication standard specified by S37 and the B command During handshake fallback to a lower sp...

Страница 49: ...es the modem for pulse non touch tone dialing Dialed digits are pulsed until a T command or dial modifier is received Command Qn Result Codes Enable Disable Values n 0 or 1 Default 0 Description Q0 En...

Страница 50: ...Read value of register Sr and display it in 3 digit decimal form E g S2 gives the response 043 Command T Tone Dialing Values P T Default T Description Configures the modem for DTMF touch tone dialing...

Страница 51: ...l result codes W1 CONNECT result code reports serial port speed enables protocol result codes W2 CONNECT result code reports line speed enables protocol result codes Command Xn Result Code Selection V...

Страница 52: ...ONE and BUSY X5 Extended result codes with NO DIALTONE and BUSY X6 Extended result codes with NO DIALTONE and BUSY X7 Basic result codes with NO DIALTONE and BUSY Command Yn Long Space Disconnect Valu...

Страница 53: ...Auto Retrain Values n 1 Default 1 Description B0 Disable V 32 auto retrain Not supported B1 Enable V 32 auto retrain Command Cn Data Carrier Detect DCD Control Values n 0 or 1 Default 1 Description C...

Страница 54: ...always on D1 If DTR drops while in online data mode the modem enters command mode issues an OK and remains connected D2 If DTR drops while in online data mode the modem hangs up If the signal is not...

Страница 55: ...guard tone G1 Set guard tone to 550 Hz G2 Set guard tone to 1800 Hz NOTE The G command is not used in North America Command Jn Auxiliary Relay Control Values n 0 Default 0 Description J0 The auxiliar...

Страница 56: ...e M1 Not supported responds ERROR Command Qn Asynchronous Communications Mode Values n 0 5 6 8 or 9 Default 5 Description Q0 N0 Q5 Error control with data buffering Same as N3 Q6 Asynchronous with dat...

Страница 57: ...ues n 0 or 1 Default 0 Description S0 Force DSR always high on S1 Let DSR go high only during a connection Command Tn V 54 Test Commands Values n 0 1 3 or 6 Default None Description T0 Abort Stop any...

Страница 58: ...lays the callback security passwords Command Wn Store Current Configuration Values n 0 Default None Description W0 Stores current modem settings in nonvolatile memory and causes them to be loaded at p...

Страница 59: ...some software Y1 Not supported responds ERROR Command Zy x Store Dialing Command Values y 0 3 callback security disabled or 0 29 callback security enabled x Dialing command Default None Description S...

Страница 60: ...n 100 ms units Default 3 Description In non error correction mode only sends a break signal of the specified length to a remote modem Works in conjunction with the K command Command Gn Modem Port Flow...

Страница 61: ...ak Control Values n 0 5 Default 5 Description Controls the response of the modem to a B command The response is different for each of three different states Data mode The modem receives the break from...

Страница 62: ...rs and send break to the computer K1 Same as K0 K2 Send break immediately to the computer K3 Same as K2 K4 Send break to the computer in sequence with the received data K5 Same as K4 Online command mo...

Страница 63: ...lt 3 Description N0 Non error correction mode with data buffering buffer mode same as Q6 N1 Direct mode N2 MNP reliable mode If the modem cannot make an MNP connection it disconnects N3 V 42 MNP auto...

Страница 64: ...ame as N3 Command Qn Flow Control Selection Values n 0 1 or 3 Default 3 Description Q0 Disable flow control same as K0 Q1 XON XOFF software flow control same as K4 Q2 CTS only flow control Not support...

Страница 65: ...y changing the value of S30 Command Vn Protocol Result Code Values n 0 1 or 2 Default 1 Description V0 Disable the appending of the protocol result code to the DCE speed V1 Enable the appending of the...

Страница 66: ...alling tone to allow remote data fax voice discrimination Command B View Numbers in Blacklist Values n a Description If blacklisting is in effect AT B displays the numbers for which the last call atte...

Страница 67: ...iption DC0 The modem responds to AT commands DC1 The modem ignores AT commands NOTE The modem will respond to AT DC for 10 seconds after power up Command En Fallback and Fall Forward Control Values n...

Страница 68: ...re Setup Password Values x password 1 8 characters case sensitive Default MTSMODEM Description Stores a new remote configuration setup password Command AT CR Escape Sequence Values n a Description Put...

Страница 69: ...ommand to read or to alter the contents of S registers see previous section Register Unit Range Default Description S0 1 ring 0 1 255 1 Sets the number of rings until the modem answers ATS0 0 disables...

Страница 70: ...before aborting a call Also sets the wait for silence time for the dial modifier S8 seconds 0 65 2 Sets the length of a pause caused by a comma character in a dialing command S9 decimal 0 1 127 37 Set...

Страница 71: ...V 25 data calling tone which allows remote data fax voice discrimination S36 decimal 0 7 7 Specifies the action to take in the event of a negotiation failure when error control is selected see S48 S37...

Страница 72: ...The default maximum speed is 56 kbps 0 56K disabled 1 56K enabled 2 32000 bps 3 34000 bps 4 36000 bps 5 38000 bps 6 40000 bps 7 42000 bps 8 44000 bps 9 46000 bps 10 48000 bps 11 50000 bps 12 52000 bp...

Страница 73: ...the following table lists the S36 and S48 configuration settings for certain types of connections S48 7 S48 128 S36 0 2 LAPM or hangup Do not use S36 1 3 LAPM or async Async S36 4 6 LAPM MNP or hangu...

Страница 74: ...4 ERROR Invalid command 5 CONNECT 1200 Connected at 1200 bps 6 NO DIALTONE No dial tone detected 7 BUSY Busy signal detected 8 NO ANSWER No answer at remote end EC is added to these result codes when...

Страница 75: ...ONNECT 21600 Connected at 21600 bps 56 CONNECT 24000 Connected at 24000 bps 57 CONNECT 26400 Connected at 26400 bps 58 CONNECT 28800 Connected at 28800 bps 59 CONNECT 31200 Connected at 31200 bps EC i...

Страница 76: ...00 bps V 90 rate 78 CONNECT 48000 Connected at 48000 bps V 90 rate 79 CONNECT 50000 Connected at 50000 bps V 90 rate 80 CONNECT 52000 Connected at 52000 bps V 90 rate 81 CONNECT 54000 Connected at 540...

Страница 77: ...76 MINIMODEM USB Terse Verbose Description 88 DELAYED Delay is in effect for the dialed number 89 BLACKLISTED Dialed number is blacklisted 90 BLACKLIST FULL Blacklist is full...

Страница 78: ...nce or troubleshooting as if you were on site 6 2 Basic Procedure The following steps are valid regardless of whether the connection is established by the local or the remote modem 1 Establish a data...

Страница 79: ...n the normal way CAUTION If you hang up while you are in remote configuration mode it may lock up the remote modem 6 3 Setup The MiniModem is shipped with a default setup password BLACKBOX Because any...

Страница 80: ...long The modem responds with OK 4 The new password is saved automatically You can now either enter more AT commands or exit the data communications program The next time you remotely configure the mod...

Страница 81: ...his remotely you won t be able to change it back remotely 1 Establish a remote configuration link with the remote modem as described in Basic Procedure 2 Type ATS9 n where n is the ASCII code for the...

Страница 82: ...m might be defective However it is more likely that the source of your problem lies elsewhere The following symptoms are typical of problems you might encounter None of the LEDs light when the modem i...

Страница 83: ...ot come on double check the cable connections If the TR LED does not come on check to see that the software from the installation disk has been installed see Section 3 6 7 3 The Modem Does Not Respond...

Страница 84: ...it back in Try rebooting the computer The modem might be defective If you have another MiniModem try swapping modems If the problem goes away the first modem is possibly defective Call Black Box Techn...

Страница 85: ...ion string When you dial again the modem will report the call s progress If the modem reports NO DIALTONE use a phone to check that you re getting a dialtone on the line If you have voice mail that us...

Страница 86: ...m s initialization string to replace X4 with X3 which will cause the modem to ignore dial tones NOTE X3 is not allowed in some countries such as France and Spain If the modem reports BUSY the other nu...

Страница 87: ...e was answered at the other end but no connection was made You might have dialed a wrong number and a person answered instead of a computer or you might have dialed the correct number but the other co...

Страница 88: ...ng by including the disabling code in the modem s dial prefix for example ATDT 70 note the comma which inserts a pause before the number is dialed To change the dial prefix in Windows 95 or 98 HyperTe...

Страница 89: ...part or because you exceeded your time limit for the day Try again 7 6 The Modem Cannot Connect When Answering Autoanswer might be disabled Turn on autoanswer in your data communications program or s...

Страница 90: ...have Caller ID service from your telephone company 7 8 Fax and Data Software Can t Run at the Same Time Communications devices can be accessed by only one application at a time In Windows 95 or 98 you...

Страница 91: ...Notice The Industry Canada label identifies certified equipment This certification means that the equipment meets certain telecommunications network protective operational and safety requirements The...

Страница 92: ...ntenance facility designated by Black Box Any repairs or alterations made by the user to this equipment or equipment malfunctions may cause the telecommunications company to request that you disconnec...

Страница 93: ...not exceed 5 A 3 Compliance with BABT Requirements WARNING Interconnection directly or by way of other apparatus of ports marked SAFETY WARNING see instructions for use with ports marked or not so ma...

Страница 94: ...gister recall Any other use will invalidate the approval of the apparatus if as a result it then ceases to comply with the standards against which approval was granted A 4 European Low Voltage Directi...

Страница 95: ...us A 5 EMC Safety and Terminal Directive Compliance The CE mark is affixed to this product to confirm compliance with the following European Community Directives Council Directive 89 336 EEC of 3 May...

Страница 96: ...ed to the Australian telecommunications network must have a valid AUSTEL permit This modem has been specifically configured to ensure compliance with AUSTEL standards The following commands can affect...

Страница 97: ...there shall be a delay of at least 30 minutes before attempting to call the number again WARNING Failure to set the modem and any communications software used with the modem to the values shown above...

Страница 98: ...noise and may also cause a false answer condition Should such problems occur do NOT contact the Telecom Faults Service The preferred method of dialing is to use DTMF tones as this is faster than puls...

Страница 99: ...ssion problems In a loopback test data from your computer loops through the circuits of your modem and or a remote modem before it appears on your monitor When the loop has been completed the data on...

Страница 100: ...perate at all speeds except 300 bps B 2 Local Analog Loopback V 54 Loop 3 In this test data from your computer or terminal is sent to your modem s transmitter converted into analog form looped back to...

Страница 101: ...he CD LED is on If the modem is set for 14 400 bps or higher a speed LED should be on If the CD LED is not on your modem is defective 4 Enter characters from your keyboard For this test typing multipl...

Страница 102: ...e line could be at fault B 3 Remote Digital Loopback Test V 54 Loop 2 The remote digital loopback test tests the phone lines and the circuits of both your modem and a remote modem In this test your mo...

Страница 103: ...minal mode Type AT and press ENTER you should get an OK message Type AT N and press ENTER to disable error correction 3 Dial the remote modem and establish your online connection 4 Type the escape seq...

Страница 104: ...the remote modem enters its analog receiver is converted to digital data is reconverted into analog and then is transmitted back to your modem Your modem passes this test if the data received on your...

Страница 105: ...while the remote modem is not Data is entered and transmitted from the remote modem sent across the phone line to your modem and looped back to the remote modem Figure B 3 Local digital loopback test...

Страница 106: ...rcase U characters is a good way to send an alternating test pattern of binary ones and zeros The data received by your modem enters its analog receiver is converted to digital data is reconverted int...

Страница 107: ...106 MINIMODEM USB transmission type AT T and press ENTER to exit the test then type ATO and press ENTER to return on line If you wish to terminate the call type ATH and press ENTER to hang up...

Страница 108: ...29 ASCII code 80 AT commands 31 37 40 78 C Call Waiting 87 Caller ID 29 88 Command mode 37 CompuServe 29 D Data mode 37 Data communications and fax software 32 Default setup password 78 Dialing Proper...

Страница 109: ...4 to 1 30 ITU T V 54 98 L LED indicators 35 LEDs 81 Lightning protection 35 LINE jack 23 34 84 Local analog loopback 98 99 Local digital loopback 98 104 M MNP5 2 to 1 data compression 30 MNP Class 3...

Страница 110: ...esult Codes 73 S S Registers 68 Setup disk 26 Standard AT command set 31 T Terminal mode 82 TIA 29 Trio data fax and voice software 18 TU T V 42 LAP M 30 U Universal Serial Bus USB 17 Update Device Dr...

Страница 111: ...110 MINIMODEM USB V V 17 16 V 42 error correction 16 V 42bis data compression 16 V 90 16 30 W Windows 95 Installing in 25 Windows 98 Installing in 26 Windows 98 Hyperterminal 27 86 World Wide Web 28...

Страница 112: ...1000 Park Drive Lawrence PA 15055 1018 724 746 5500 Fax 724 746 0746 Copyright 1999 Black Box Corporation All rights reserved...

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