Telenetics DSP9612RM manual Loopback Control Switch, Illustrates these three diagnostics

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Installation

Loopback Control Switch

The front panel of the modem has a push button for initiating the following loopback diagnostic tests:

cLocal analog loopback  started by pressing the button one time.

cLocal digital loopback  started by pressing the button two times.

cRemote digital loopback  set the local modem’s RTS signal to low. Then press the remote modem’s diagnostics button three times and raise the local modem’s RTS signal to start the test. The ALB and DLB LEDs go ON when the modem is in remote digital loopback. This test is only available in Fast Poll mode only.

Figure 2-6 illustrates these three diagnostics.

Figure 2-6. Loopback Diagnostics

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Contents DSP9612RM Flash Poll Rack-Mount Modem User’s Guide Compliances Contents Contents Chapter Introduction Features Applications Ancillary DocumentationIntroduction Unpacking Your Hardware Chapter InstallationAdditional Items You Need Hardware Overview Front View of ModemComponent View Installation Summary Configuring the ModemConfiguring the Modem SW1-1 through SW1-4 − Transmit Level high- & low-speed modes SW1-5 − Receiver Dynamic Range high- & low-speed modes SW2-1 − Fast Poll/FSK high- & low-speed modes SW2-8 − Carrier Control high- & low-speed modes Low-Speed FSK Mode SW1-1 through SW1-4 Switch Settings SW1-6 and SW1-7 − RTS-CTS Delay low-speed mode only SW2-2 − CD Delay low-speed mode only SW2-5 − Soft Carrier low-speed mode only Installing the Modem in the Universal Data Shelf Installing the Modem in the Universal Data ShelfInstalling the Modem Connecting to a Transmission Line Modular Jack ConnectorsConnecting an RS-232 Device LEDs DLBLoopback Control Switch Illustrates these three diagnosticsAppendix a Troubleshooting Problem SolvingPage Appendix B Specifications General SpecificationsMechanical Specifications Back-to-Back Connections to a Second Modem RS-232 RTU InterfaceEnvironmental Specifications CompliancesAppendix C Limited Product Warranty Appendix D RMA Procedure Return Merchandise Authorization RMA Procedure