Network Layer and Transport Layer

Abstract

In the ISO™ OSI™ 7 level network design the network layer is responsible for network routing functions. It handles the addressing and delivery of data. The transport layer controls the reliable and timely transmission of data between two network nodes through flow control, segmentation and desegmentation, and error control. The session layer manages the dialogue, session, and connections between two network nodes. In WirelessHART standard the network layer encompasses all three OSI layers. It is the point of convergence for traditional HART Token-Passing Networks and WirelessHART TDMA-based networks. This chapter lists the services that the network layer provides to the upper application link layer. It talks about the communication traffic, routing, and security. It also describes the format of the network layer PDU. Please refer to the Network Management Specification (HCF_SPEC-85) for more details.