7.0 Diagnostics

In Hayes emulation mode only, initiate the ALB test using the command &T1 (preceded by AT). In any mode, initiate the ALB test using the modem’s front panel controls, explained in the following paragraphs.

Make sure the modem is idle, the data rate is the same as the DTE’s data rate, and the DTR circuit is on. (If TR is present on the EIA status screen, the DTR circuit is on.)

From the second page of the LCD MAIN MENU, select TEST. TEST takes you to screen 1 of the LOCAL TEST menu, where ALB is displayed as one of the test selections. Select ALB.

The ANALOG LOOPBACK screen is displayed, with ON and OFF as the possible selections.

Select ON to activate the test. In general, the "DSR during ALB test option" discussed in Chapter 3 should be left ON (default selection) to avoid disrupting the DTE and DTE software operations.

The EIA status screen is displayed while the test is being conducted. Make sure that test data is being generated. Watch for data errors. By transmitting test data and comparing it with the received copy, you can make sure the DTE and modem are both working.

To end the test, press the ENT pushbutton to return to the ANALOG LOOPBACK screen, and then select OFF.

7.7.2ANALOG LOOPBACK SELF-TEST (ALBST)

In the analog loopback self test, the modem is placed in analog loopback and data is sent and received by an internal 511-bit pattern generator and receiver. Therefore, no DTE or external BERT is necessary. Figure 7-2 shows the data flow for this test.

In Hayes mode only, initiate the ALBST using the command &T8 (preceded by AT). In any mode, initiate the ALBST using the modem’s front-panel controls, as follows:

From page 2 of the LCD MAIN MENU, select TEST. This takes you to screen 1 of the LOCAL TEST menu, where ALBST is visible as one of the selections. Select ALBST.

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MD885C-R2, MD885A-R3, MD885AE-R2, 34336 specifications

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