In telecommunications and computer networks, a channel access method or multiple access method allows several terminals connected to the same physical medium to transmit over it and to share its capacity. Examples of shared physical media are bus networks, ring networks, hub networks, wireless networks and half-duplex point-to-point links. Respective wording is recommended with IETF on Mobile Ad Hoc Networking Terminology.
Multiple access protocols and control mechanisms are called media access control (MAC) for Data links, which is provided by the Data Link Layer in the OSI model and the Link Layer of the TCP/IP model.
A multiple access method is based on a multiplex method, that allows several data streams or signals to share the same communication channel or physical media. Multiplexing is provided by the Physical Layer. Note that multiplexing also may be used in full-duplex point-to-point communication between nodes in a switched network, which should not be considered as multiple access.
时间: 2009-2-12 00:51
作者: zhouqf123
注意下面这句话，
Multiple access protocols and control mechanisms are called media access control (MAC) for Data links ...
1.接入网技术与局域网技术二者的目的不同，手段也不同，唯一的交集就是以太网。
2.也仅仅在这一点，二个MAC是同一个意思。
3.Media access control 本质上是一种网络的逻辑拓扑，而且必须是位于数据链路层的MAC子层；multiple access control 不受这种限制，而且也没有规定必须是逻辑的，也可以是物理的，LS引用的接入网定义的最后一段说明了这一点。
4.所以说，二者仅仅是在某一点发生了交叉，不能据此就说明二者具有可比性。
