Multi-Tech Systems MT5600DSVD manual Remote Digital Loopback Test V.54 Loop

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MultiModemDSVD User Guide

C Loopback Tests

3.Type AT&T1 and press ENTER. This places your modem in analog loopback mode in the originate mode. A CONNECT message should appear on your dis- play. The modem is now out of command mode and in a pseudo-online mode.

4.Note that the CD LED is on. If you are set for 14,400 bps or higher, a speed LED should be on. If the CD LED is not on, there is a defect in your modem.

5.Enter characters from your keyboard. For this test, typing multiple uppercase U characters is a good way to send an alternating test pattern of binary ones and zeros. The characters entered should be displayed on your monitor.

6.To exit the test, type the escape sequence +++AT and press ENTER. This puts the modem in online command mode. Then type either AT&T or ATH to return to command mode.

7.Your modem passes this test if the characters received on your monitor are the same as those entered from your keyboard. If different characters appear on your monitor, your modem is probably causing the problem, though it could also be your computer. If your modem passes this test, but you are receiving er- rors while on line, the remote modem or the phone line could be at fault.

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 modem must be on line with another modem that is set up to respond to a request for remote digital loopback. (Note that some modems might not support remote digital loopback or might have it disabled.) Data from your computer or terminal is transmitted through your modem and over the phone line to the remote modem, where it is then looped back to your modem.

AT&T6

CONNECT 9600

UUUUUUUUUUU

UUUUU

Digital Analog			Analog Digital

AT&T4

OK

Computer or Terminal Local MultiModem

Remote MultiModem Computer or Terminal

Figure C-2. Remote digital loopback test.

Test procedure

1.Arrange to have &T4 set on the remote test modem. This command enables the remote modem to respond to an &T6 request for a remote digital loopback test from the local modem.

2.Open your communications software and go into terminal mode. Type AT and press ENTER; you should get an OK message. Type AT\N and press ENTER to disable error correction. Type AT+MS=9,1,9600,9600 and press ENTER to set the local modem to V.32 mode at 9600 bps.

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Contents Page Record of Revisions Introduction AT Commands, S-Registers & Result Codes Appendix E Upgrading the Modem Introduction Introduction FeaturesProduct Description Data What Is in Your Modem Package? Related ManualsInstallation We supply Safety WarningsWhat You Will Need You supplyChange the Speaker Jumper Mount the FeetOpening the Modem Changing the Speaker Jumper Location of speaker jumperRS232 Connection Connect the Modem to Your SystemLine Connection Phone Connection Power ConnectionPower-On Test Microphone ConnectionInstalling the Modem Driver Install the Modem DriverRemoving Your Old Modem Driver Install and Configure Your Software Operation Front Panel Configuring the Modem Connecting to the InternetDial-Up Networking To install and run Dial-Up Networking in Windows 95 orTo dial your Internet access provider Dial-Up Networking in Windows 95/98Dial-Up Networking in Windows Me To install Dial-Up NetworkingDial-Up Networking in Windows NT Select Start Settings Network and Dial-up Connections Dial-Up Networking in WindowsFax Operation To Originate a Voice Call in Speakerphone ModeVoice Operation To Originate a Dsvd Call Using the Headset To Answer a Voice Call in Speakerphone ModeTo Answer a Dsvd Call Using the Headset References AT Commands Registers Result Codes AT Commands AT Command Summary Hook Control Echo Command Mode CharactersDS=y Dial Stored Telephone Number Information RequestDisplay Legacy Parameters Monitor Speaker VolumeMonitor Speaker Mode Modulation HandshakePulse Dialing Return Online to Data ModeResult Codes Enable/Disable Select RegisterResult Code Selection Modem ResetConnect Message Control Long Space DisconnectData Terminal Ready DTR Control Error Correction ModesData Carrier Detect DCD Control Modem-Initiated Flow Control22bis Guard Tone Control Load Factory Settings42bis Data Compression Telephone Jack ControlTest Commands Communications ModeAsynchronous Communications Mode Pulse Dial Make/Break RatioSelect Profile for Hard Reset Display Current ConfigurationStore Current Configuration Display Last Connection StatisticsZy=x Store Telephone Number Line Signal LevelLine Signal Quality Data Compression Control\Bn Transmit Break PCM Code Selection\An Maximum MNP Block Size \Kn Break Control\Nn Error Correction Mode Selection \Vn Single Line Connect MessageModulation Selection SubparametersMNP Extended Services Distinctive Ring Control Command #CID=n Caller IDFlash Memory Download Command +++ATCR Escape Sequence Voice CommandsCommand $SBn Serial Port Baud Rate Command -SMS=nData/DSVD ModeCommand #CLS=n Data, Fax, or Voice/Audio Select Dsvd Enable/DisableCommand #BDR=n Baud Rate Select Command #MDL? Identify ModelRegister Unit Range Default Description RegistersS32 S37 Register Unit Range Default Description S86 Result Codes Terse Verbose DescriptionProtocol ALT +FCERROR Solving Problems None of the Indicators Light Modem Does Not Respond to Commands LightModem Dials But Cannot Connect Modem4Disconnects While Online File Transfer4Is Slower Than It Should Be Modem4Cannot Connect When AnsweringData Is Being Lost Modem4Doesn’t Work with Caller ID There Are Garbage4 Characters on the MonitorFax and Data4Software Can’t Run at the Same Time Appendixes Appendix a Regulatory Compliance FCC Part 68 TelecomFCC Part Industry CanadaFax Branding Statement Canadian Limitations NoticeInternational Modem Restrictions EMC, Safety, and R&TTE Directive ComplianceNew Zealand Telecom Warning Notice South African Notice Appendix B Technical Specifications MultiModemDSVD User Guide Technical Specifications Voice Compression Test procedure Local Analog Loopback Test V.54 LoopRemote Digital Loopback Test V.54 Loop Figure C-2. Remote digital loopback testLocal Digital Loopback Test V.54 Loop Figure C-3. Local digital loopback testMultiModemDSVD User Guide Loopback Tests Service Limited WarrantyOnline Warranty Registration North American ProductsTechnical Support International ProductsOrdering Accessories Internet SitesUpgrade Overview Identify the Modem FirmwareIdentify the Current Firmware Version Download the Upgrade FileExtract the Upgrade Files Clear Your Stored ParamentersUpgrade the Modem’s Firmware Restore Your ParametersIndex MultiModemDSVD User Guide Index MultiModemDSVD User Guide Index MultiModemDSVD User Guide Index