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Another modification requested by Avondale is related to the Mean Time To Repair ( MTTR ) unit . Mean Time to Repair ( MTTR ) . With support for NSF / SSO , the effect of failures and network reconvergence are minimized and the amount of traffic loss and Mean Time to Repair ( MTTR ) are lowered . Mean time to repair ( MTTR ) does not suffer either because there is no greater number of active components " soldered down " to the backplane than with any other single-board computer design . It should be noted the new technology classrooms are distributed across campus which creates an additional challenge to maintaining an acceptable Mean Time to Repair ( MTTR ) ratio .