Multi-Tech Systems MT2834BR, MT2834BLR manual Local Analog Loopback Test Synchronous Mode

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Chapter 5 - Testing the Modem

5.4Local Analog Loopback Test (Synchronous Mode)

To initiate the Local Analog Loopback Test, with the modem in Synchronous mode:

1.Enter AT&M1U. This first switches your modem from asynchronous to synchronous mode, and places it into the Analog Loopback/Originate mode. The modem is now out of the Command mode and in the pseudo On-Line mode.

2.Once you receive a connect message (if responses are enabled), enter data from your keyboard. For this test, typing multiple upper case "U" characters is a good way to send an alternating test pattern of ones and zeros.

3.For a more complete test, you should also test the modem in Answer mode. To do this, pull out and then reinsert modem card in rack cage. Then type AT&M1U1 and hit ENTER to place the modem in Analog Loopback mode, in the Answer mode. Then repeat step 2.

Computer or Terminal

Local MultiModem

UUUU

Digital

Analog

Figure 5-4. Local Analog Loopback Test (Syncronous Mode)

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Contents User Guide Revision Date Description Contents AT Commands and S-Register Summary Introduction Introduction FeaturesHow to Use This Manual Installation Card Cage PreliminariesSerial Cable Telephone LineInstallation PC Board Controls Switch Function Position Effect DIP-Switch SettingsAnswer/Originate Originate call Async/Sync/Leased Line Dip Switch Settings #13 Position Effect OOS Busy Out Toggle Switch2 MI/MIC Option Jumper Out of Service/Test JumperDial-Up and Leased Lines Modem LED Indicators On-Line Diagnostics Installation Serial Port Limitations How Can You Identify Your Uart Type? MSD Uart Identification, Screen Configuring Software for Your Modem Configuring Your SoftwareAT &F X4 S0=0 M PC Initialization StringsMEW Modem Initialization Setup Macintosh Initialization Changing Default ParametersMEW Configuration Parameters Screen Configuring Software for Your ComputerTerminal Emulation Configuring Software for the Remote SystemFile Transfer Protocols When to Disable Data CompressionAT &F S0=0 X4 &E14 M Disabling Error CorrectionModem Commands Modem AT Commands Commands = 0, 1, 2 or DP0 #F2 Command Values Default = speed Q0 selects Result Codes displayed Reads value of S-Register r and displays value = 4 or Tone Command Break Atcr Values Default Description Callback Security CommandsCallback password with xxxxxx being callback password Remote Configuration Procedures Remote ConfigurationPassword Commands 4 V.25bis CommandsCSPs Escape Code Character RegistersLine Feed Character S10 Carrier Loss Disconnect Delay Time S25 DTR Dropout Time S36 Time Between DTR Inactive and Modem Off-Hook Result CodesTerse Verbose No Dial Tone Busy No Answer AT Commands and S-Register Summary Modem Testing Uuuu Local Analog Loopback Test/V.54 LoopDigital Loopback Test/V.54 Loop 2 Local/Manual Digital Loopback Test local / manual Digital Loopback Test remote / automatic Digital Loopback Test/V.54 Loop 2 Remote/AutomaticLocal Analog Loopback Test Syncronous Mode Local Analog Loopback Test Synchronous ModeDigital Loopback Test Local / manual Syncronous Digital Loopback Test Local/Manual Synchronous ModeDigital Loopack Test remote / automatic Syncronous Digital Loopback Test Remote/Automatic Synchronous ModeWarranty and Service Limited Warranty Tech Support ServiceRecording Modem Information Upgrading the MT2834BR Using FlashPro to Upgrade Modem FirmwareSafety Warnings Internet Babt Requirements Compliance with Babt Requirements European Low Voltage Directive Compliance with BS6789 .1 and Part Compliance with BS6328 Part Appendices Appendix a Appendix a Canadian Limitations Notice Data Rates modem Appendix B Technical SpecificationsFlow Control 2400 & 1200 bps Frequency Stability Index Index Index Index MNP SCC XON/XOFF S000316