What is the formula for computing adjusted ring length (ARL)?
The adjusted ring length of a token ring network is the sum of all cable lengths between wiring closets, minus the shortest cable between wiring closets. The ARL is used to determine the total length of the ring, and the maximum lobe distances (see section [4.8]). This calculation determines the ring length if part of the ring is removed for troubleshooting. When a cable is removed from a Ring In/Ring Out port, the loop-back creates a much larger ring than normal. The ARL calculation defines the largest ring size that can occur, based on the shortest cable between wiring closets.
