Support vector machine applications in computational biology

A transmission test and apparatus for automatically detecting a fault in a telephone circuit data communications system and for automatically sequencing through various tests for isolating the fault. Test sets are provided at each end of the data communication circuit and cooperate to automatically test both modems and the telephone circuit between them as well as performing additional tests on the test sets themselves and on the entire communications systems. Each test set contains a pseudo-random test pattern generator and receiver. Housekeeping status and command messages are transmitted between test sets by way of two frequency tones and by a digital message that is inserted periodically into the pseudo-random test pattern in a manner to be discriminated therefrom.