ISO IEC 18017:2001 pdf download – Information technology — Telecommunications and information exchange between systems — Private Integrated Services Network — Mapping functions for the employment of Virtual Private Network scenarios. 4. Terms and definitions For the purpose of this International Standard the terms and definitions given in ETS 300 415 and the following apply. 4.1 α α reference point: boundary between the Inter-Connecting Network (ICN) and the public ISDN. NOTE – The ICN at this point provides gateway functions such as numbering, charging, management and routing. 4.2 channel: means of bi-directional transmission of user or signalling information between two...