The transport layer is not just another layer. It is the heart of the whole protocolhierarchy.
传输层不仅仅是另外一层，它是整个协议层次的核心所在。
2
We discuss the protocol from three aspects: protocolhierarchy, communication link and package design.
我们从协议层次，连接通路，报文设计三个方面对它进行了讨论。
3
With the latest research and development in embeded-net technology, here discussed the architecture of embeded device net connection and protocolhierarchy.