This Technical Report describes packetized data transfer in Private Switching Networks (PSNs), including access to other networks (e.g. X.25) via PSNs. Packetized voice, video and other non-data packet mode bearer services are beyond the scope of this Technical Report.
This Technical Report also provides guidelines for the standardization of protocols supporting a new Bearer Service for packetized data transfer over PSNs. The architecture for these protocols fully aligns with ISDN out-of-band control principles. Furthermore ISDN concepts compatible with high performance objectives are adopted, notably:
- the use of link layer addressing for routing and relaying purposes, and
- the partial termination of the bearer channel protocol in nodes of the network.
This Technical Report also describes functions required from terminals and PSNs to provide an overall end-to-end network service.