Dumb, switched


The following chart describes what DTR does for Dumb switched mode of operation. The rows present the possible operating modes, and the columns describe the modem Data Terminal Detect (DTD) operation for the four supported &D commands. Click on letters in the following table for descriptions of modem behavior.

Note: OPTIMA products support switched Dumb Mode operation. 
Operating Mode     &D0        &D1    	    &D2    	  &D3     


V.14 (&Q0)        none        none        I, H     	  R          


&Q1               C, H         C          I, C, H    C, R       


&Q2               I, D, H     I,D,H       I, D, H    I, D, R   


&Q3               I, O, H     I, O, H     I, O, H    I, O, R    


AutoSync             H         none       I, H       R          


AutoSync II        none        none       I, H       R          


error control      none        none       I, S       R          


ASB                none        none       I, S       R

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