DIN EN 60870-6-2:1997-06

Foreword
Introduction
1 Scope
2 Normative references
3 Definitions
4 Abbreviations
5 Transport layer
5.1 General presentation of the transport layer
5.2 The transport service
5.3 The transport protocol
6 Network layer
6.1 Presentation of the network layer
6.2 The network service
6.3 The network protocol
7 Sub-networks
7.1 Packet switched network
7.2 Circuit switched network
Annexes
A (normative) Transport protocol - Elements of
     procedure
B (normative) Transport protocol - Protocol classes
C (informative) Bibliography
ZA (normative) Normative references to international
     publications with their corresponding European
     publications

Considers standards related to layers 1-4 of the OSI reference model, with the following objectives: Describe role and functions carried out by each layer. List relevant ISO standards. Describe considerations and recommendations for use of standards in application context of part 6. Describes use of standards in their applications to end systems (ES) and intermediate systems (IS).ES contains all seven layers of the OSI reference model in addition to an application process, while the IS acts as a communication relay between sub-networks.