# adjusted ring length (ARL)

The Adjusted Ring Length (ARL) is the addition of all cable lengths between the distribution rooms in a Token Ring network

. This mathematical ARL quantity subtracts the shortest link

between two distribution rooms from the total ring length. If a is the shortest length between two distribution rooms, and b, c and n each have longer lengths, then the averaged ring length is ARL = (a + b + c + n) - a. This calculation basis, which is the basis for determining the lobe length, takes into account the worst possible case, namely that the shortest link between two distribution rooms fails. The shortest cable length must therefore be subtracted from the total length. The ring length to be passed through would be in the case of a failure of the shortest connection (a): Ring length = 2 x (b + x + n).