Ositech comm Trumpcard Data/Fax Modem manual Remote Digital Loopback

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Modem Test Procedures

Remote Digital Loopback

This test checks the local and remote modems and the telephone circuit. The test is only functional when the Modem is set to direct mode (&Q0) and the COM port baud rate is set to 14400 bps (Trumpcard 14400) / 28800 bps (Trumpcard 28800) or less.

A message is sent to the remote unit by the Modem. The remote unit loops the test message back. The received message is then compared with the previously transmitted message to verify the connection. If the data patterns do not match, then there is a problem with either the local or remote Modem or the telephone circuit. If this is the case, both local and remote stations may initiate local analog loopback tests to further isolate the source of the problem.

To perform this test:

1.Enter AT&F&Q0 [ENTER] to put the Modem in basic asynchronous mode.

2.Establish a connection with a remote Modem and enter +++ (the escape sequence) to revert to command mode. The Modem will reply with OK.

3.Enter AT&T6 [ENTER] to begin the test. The Modem will display a CONNECT response if the loopback data link has been successfully completed. It will display an ERROR response if the link has failed.

If successful, key in a test message. The message will be echoed on the local screen.

4.Enter +++ (the escape sequence). The Modem will respond with OK.

5.Enter AT&T0 [ENTER] to end the test. The Modem will respond with

OK.

User’s Guide and Reference

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Contents User’s Guide and Reference Trumpcard Data/Fax ModemFTP How To Contact UsCopyright Preface FCC Notice Regulations Governing the Use of Modems Page Vii Contents Modem Command Reference Page Introduction Data Mode FeaturesCellular Mode Facsimile ModeUnique Features 32bis Industry Standards22bis 27ter 42bisMNP 2, 3, MNPPreparing for Installation Hardware InstallationInstalling the Trumpcard Modem Pcmcia Modem Adapter connector is keyed to go in one way Line Interface Module Connection to Telephone Network Basic Modem Operation Enabling The Trumpcard Before You BeginOperating the Trumpcard Using AT CommandsTone or Pulse Dialling Making an Outgoing CallConnection Messages Re-Dialling the Last NumberStoring a Number Carrier Connect 1200TX/75RXFAX DataEnding Your Connection Setting Up for a Non-Error Correcting ConnectionReceiving an Incoming Call Setting up for a Cellular ConnectionModem Configurations for Cellular Operation Cellular Phone Configuration Cellular Call Status Section Four Trumpcard 14400/28800 Modem Modem Command Reference Modem Command Guidelines Modem Command Reference +MS Modem Command SummaryModem Command Reference Answer Modem Command DescriptionsRe-execute ATB1 Bn Set ITU-T or Bell ModeDn Dial ATB0ATDS=2 Fn Select Line Modulation 14400 only En Command EchoSub-parameter Definitions +Ms Select Line Modulation 28800 onlyATH1 Hn Switch-Hook ControlVFC ATH0Mn Speaker Control IdentificationOlume On Return To The On-Line State Nn Automode DetectionATQ0 Set Pulse Dial as DefaultQn Result Code Display Sn Read/Write S RegistersWn Connect Message Control Set Tone Dial as DefaultVn Result Code Form Xn Extended Result Codes Result Codes Q0, V1, Wn, S95 Carrier Connect Cn DCD Option Zn ResetYn Control Long Space Disconnect None Restore Factory ConfigurationDn DTR Option Kn DTE/Modem Flow Control Gn Set Guard ToneJn T elephone Jack Selection Ln Line Type Mn Communication ModePn Dial Pulse Ratio disabled for the U.S Qn Communication ModeSn DSR Option Rn RTS/CTS OptionTn T est and Diagnostic AT&T8 View Configuration and User ProfilesAT&T6 AT&T7Wn Store User Profile Yn Designate Default User Profile\Kn Break Control Zn=x Store Phone Number\Bn T ransmit Break \Gn Modem-to-Modem Flow ControlAT\K5 AT\K1AT\K3 Cn Compression Control \Nn Operation Mode ControlReport Line Signal Quality En Enable/Disable Line Quality MonitorReport Received Signal Level Hn Link Negotiation Speed Kn MNP Extended ServicesMn T ransmit Level Adjustment for Cellular Connection En Compromise Equalizer @Mn Initial Cellular Power LevelInit string = Null Init string Event Based CommandModem Register Summary Default Register SettingsModem S Registers Modem Command Reference S95 Extended Result Codes Register Descriptions S8 Pause S5 Backspace CharacterS6 Wait S7 Wait For Carrier After DialS12 Escape Code Guard Time S10 Lost Carrier To Hang Up DelayS9 Carrier Detect Response Time S11 Dtmf T one DurationS30 Inactivity Timer S18 Test TimerS24 Sleep Inactivity Timer S25 Delay to DTRS36 Lapm Failure Control S32 XON CharacterS33 Xoff Character S37 Desired Telco Line Speed Range DefaultS46 Protocol Selection S38 Delay Before Forced DisconnectS86 Connection Failure Cause Code S48 V .42 Negotiation ActionS95 Extended Result Codes Class 2 Commands Facsimile CommandsClass 1 Commands Modem Test Procedures Local Modem Self-Test Local Analog Loopback Local Analog Loopback with Self- Generated Pattern Remote Digital Loopback Remote Digital Loopback with Self- Generated Pattern Local Digital Loopback ROM Checksum Test Testing Modem MemoryProduct Information