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单词 Token passing
释义

Token passing

中文百科

令牌传递

令牌传递(token passing)是一种通信的信道访问方法,其中有一种称为令牌的信号在节点之间传递,收到令牌的节点表示授权可以通信,著名的例子有令牌环及ARCNET

令牌传递的架构有轮转调度的机制,若封包的大小相等,会有极大极小公平的特性。相对于竞争为基础的信道访问方法,令牌传递的优点是没有碰撞,也不需要等待时间,当有大量需求时频道的带宽可以充份的利用,其缺点是当通信需求不多时,节点也需等待到令牌才能通信,因此延迟会变大。

有些令牌传递的架构中隐含了令牌传递的过程,因此不需真的传递令牌信号。例如ITU-T的G.hn下,利用现有家用线路(电源线、电话线及同轴线)的「无竞争时隙」(Contention Free Time Slots)信道访问方法。

英语百科

Token passing 令牌传递

In telecommunication, token passing is a channel access method where a signal called a token is passed between nodes that authorizes the node to communicate. The most well-known examples are token ring and ARCNET.

Token passing schemes provide round-robin scheduling, and if the packets are equally sized, the scheduling is max-min fair. The advantage over contention based channel access is that collisions are eliminated, and that the channel bandwidth can be fully utilized without idle time when demand is heavy. The disadvantage is that even when demand is light, a station wishing to transmit must wait for the token, increasing latency.

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更新时间:2025/6/21 23:59:12