通信接口：令牌环网或以太网适配器。

Communication interfaces: Token ring or Ethernet adapters.

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分块常常发生在传输媒介混合在一起的环境中，比如兼有以太网和令牌环网的网络。

Fragmentation often occurs in environments that have a mix of media such as Ethernet and Token Ring.

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RETHER是一种基于以太网的定时令牌总线协议，能够对数据传输提供实时性能。

RETHER is a timed-token-passing bus protocol based on Ethernet. It provides the real-time transfer performance.

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