<Tr> <Th> Symbol </Th> <Td> E </Td> </Tr> <Tr> <Th> Named after </Th> <Td> Agner Krarup Erlang </Td> </Tr> <P> The erlang (symbol E) is a dimensionless unit that is used in telephony as a measure of offered load or carried load on service - providing elements such as telephone circuits or telephone switching equipment . A single cord circuit has the capacity to be used for 60 minutes in one hour . Full utilization of that capacity, 60 minutes of traffic, constitutes 1 erlang . </P> <P> In 1946, the CCITT named the international unit of telephone traffic the erlang in honor of Agner Krarup Erlang . </P>

What is the dimension of traffic measurement unit erlang