Importance

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Abstract

Digital data recorded in Manchester code in a 1553 MUX bus has the data portion of each word converted into NRZ-L format with the synchronization prefix or portion of each word converted into a corresponding NRZ-L formatted portion according to a predetermined protocol. The NRZ-L formatted word, prefix and data, is then converted into DM-M coded format. The Manchester code NRZ-L coded data is driven at a 1-MHz clock frequency, while the DM-M coded format is driven at a 500 kHz clock frequency. The data in DM-M code is then recorded on magnetic tape in a test recorder. The magnetic tape can be analyzed at a remote site after test by decoding the DM-M word into its corresponding NRZ-L word driven at the 1-MHz clock rate. The synchronization portion of the reconverted NRZ-L word is identified and the NRZ-L word correspondingly assembled into an output register according to a predetermined protocol. The protocol used to reassemble the NRZ-L word in the register is distinct as between the prefix and the remaining portion of the word. The reassembled word is then clocked out of the register at a 2-MHz rate with the result that the synchronization prefix in invalid Manchester code is resynthesized and the assembled word is reconverted into Manchester code. As a result, Manchester coded data on a 1553 MUX bus can be recorded at lower frequency on magnetic tape and subsequently analyzed in such a manner that all the information on the bus is stored and retrieved in a manner that is substantially independent of the means of recordal.

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First Claim