多站接入单元（Multistation Access Unit，MAU）也称为令牌环集线器，是在令牌环网络中实现单个工作站互联的设备。 令牌环的网络结构在逻辑上是环型，但其物理结构则是星型。

A Media Access Unit (MAU), also known as a Multistation Access Unit (MAU or MSAU) is a device to attach multiple network stations in a star topology as a token ring network, internally wired to connect the stations into a logical ring (generally passive i.e. non-switched and unmanaged; however managed token ring MAUs do exist in the form of CAUs, or Controlled Access Units).