Control of access through local carrier sensing for high data rate
networks and control of access of synchronous messages through
circulating reservation packets
    21.
    发明授权
    Control of access through local carrier sensing for high data rate networks and control of access of synchronous messages through circulating reservation packets 失效
    通过本地载波侦听对高数据速率网络的访问控制,以及通过循环保留分组控制同步消息的访问

    公开(公告)号:US5229993A

    公开(公告)日:1993-07-20

    申请号:US660664

    申请日:1991-02-25

    摘要: A combination of two new access methods for ring and unidirectional bus networks supports high data rate integrated traffic. The first access method provides access for asynchronous traffic. When a node senses the channel idle, it can begin to transmit. When it senses an incoming signal, it must stop transmitting in order to avoid a collision. But unlike other access protocols which abort the transmission when a collision occurs or is imminent, the process truncates the message in a fashion such that it can be resumed later when the channel again is idle. The system is called Carrier Sensed Multiple Access-Ring Network (CSMA/RN). The second access method provides support for synchronous traffic. This method implements one or more circulating reservation packets which permit a node to have reserved space when the special packet returns. The media access system is called Circulating Reservation Packet (CRP) system. Both access protocols operate simultaneously on the network with minimal interference. The CRP system is preferably used with the CSMA/RN protocol but is applicable to other fixed length, non-corrupting, circulating network structures to enable the nodes in a network to reserve space for synchronous traffic and guaranteed access.

    摘要翻译: 环形和单向总线网络的两种新的访问方法的组合支持高数据速率集成流量。 第一个访问方法提供异步流量的访问。 当节点感知到信道空闲时,它可以开始传输。 当它感测到一个进入的信号时,它必须停止传输,以避免碰撞。 但是,与发生冲突或即将发生的中止传输的其他接入协议不同,该过程将以某种方式截断消息,以便在信道再次空闲时可以恢复该消息。 该系统称为载波感应多址环网(CSMA / RN)。 第二种访问方式提供对同步流量的支持。 该方法实现一个或多个循环保留分组,当分组返回时,该分组允许节点具有保留空间。 媒体接入系统称为循环预留分组(CRP)系统。 两种接入协议在网络上同时工作,干扰最小。 CRP系统优选地与CSMA / RN协议一起使用,但是适用于其他固定长度的,不破坏的循环网络结构,以使得网络中的节点能够为同步业务保留空间并保证接入。