This article deals with computer networks. For other uses of this term, see Mau. IBM 8228 MAU.
The Multistation Access Unit (MAU or MSAU), access unit to multiple stations, is a wiring hub to which all end stations of a Token Ring network (IEEE 802.5) are connected.
The MAU is a multi-port device of the equipment in which the work stations (or stations) are connected. The MAU provides centralized control of network connections. Move the signals from one station to the next active work station in the ring. It also has a built-in relay capable of preventing the network service from being cut if a single connection or device fails.
In addition to the existing portals for connections to workstations, the MAUs have an input and an output of the ring to be able to connect to other MAUs and to expand the network, they are the "RI port" (Ring-In) and the "RO port" (Ring-Out). The cable to join the MAU is called patch cord (switch cable).
In contrast, in a coaxial cable Ethernet network, the MAU only uses one cable to perform both operations (data transmission and reception). With a 10BaseT Ethernet, the MAU must accommodate two pairs of cables (one pair to transmit and another pair to receive).
On the other hand, an MAU can support up to 72 connected computers. The cables that join the nodes with the MAU are called lobe cables (lobes) and should not exceed 100 meters.
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