This article is from the Token Ring FAQ, by James Messer James@NetworkUptime.com with numerous contributions by others.
A MAU is a 8228 Multistation Access Unit. This unit provides eight
workstation connectors and 2 MAU ports (also called Ring In/Ring Out
A CAU is a 8230 Controlled Access Unit (Basically a MAU with
intelligence). A CAU supports up to four LAMs. The Ring In/Ring Out
ports of a CAU are copper, but can replaced with fiber connectors.
A LAM is a Lobe Attachment Module for the 8230. Each LAM supports 20