e Model - Part 4: Manage- as the interface between the OSIE and the external transmission ment Framework media. The Physical Layer Service Definition is specified in ISO ISO 7498-3, IPS - OSI - Basic Reference Model - Part 3: Naming 10022. A number of physical interfaces are available for a variety of and Addressing transmission environments. ISO 8072, IPS - OSI - Transport Service Definition ISO 8073, IPS - OSI - Connection Oriented Transport Protocol Specification ISO 8326, IPS - OSI - Basic Connection Oriented Session Service 12.6 Additional provisions Definition ISO 8327, IPS - OSI - Basic Connection Oriented Session Proto- Three additional parts of the OSI Reference Model have been col Specification published that cover some other very important aspects of dis- ISO 8348, IPS - DC - Network Service Definition tributed information systems. These are summarised as follows: ISO 8348 AD2, IPS - DC - Network Service Definition, Adden- dum 2: Network Layer Addressing 1. ISO 7498-2: Security Architecture provides the framework for ISO TR 8509, IPS - OSI - Service Conventions development of various security provisions to protect system ISO 8571, IPS - OSI - File Transfer, Access and Management - (5 integrity and unauthorised access to user data. parts) ISO 7498-3: Naming and Addressing provides the concepts and ISO 8602, IPS - OSI - Protocol for Providing the Connectionless- principles for identifying objects through naming and location Mode Transport Service of objects through addressing mechanisms. ISO 8649, IPS - OSI - Service Definition for the Association ISO 7498-4: Management Framework provides the concepts Control Service Element and principles for management of the resources of the OSIE to ISO 8650, IPS - OSI - Protocol Specification for the Association ensure continuing and effective operation. Control Service Element Appendix 12.1 12/11 ISO 8822, IPS - OSI - Connection Oriented Presentation Service ISO 9066, IPS - TC - Reliable Transfer - (2 parts) Definition ISO 9072, IPS - TC - Remote Operations - (2 par