UBRR

AcronymDefinition
UBRRUART Baud Rate Register
UBRRUrban Bus Retrofit Rebuild (emission standards; US EPA)
References in periodicals archive ?
To date, over 10,000 engines have been rebuilt under the UBRR program.
It is an extension of the UBRR program on other categories of heavy-duty diesel engines.
All emission control devices certified under the UBRR program are automatically eligible for use in the voluntary program.