Information systems interconnection; relaying the connectionless-mode network service; part 7: PSDN subnetwork dependent media dependent requirements for virtual calls over a permanent access

This technical specification establishes essential media requirements related to access procedures for permanent virtual calls within Public Switched Data Networks (PSDN) supporting connectionless network services. Focusing on the interconnection of information systems, the document outlines specific guidelines for ensuring compatibility and interoperability when utilizing PSDN subnetworks. It addresses the technical parameters necessary for the reliable transmission of data across these networks without requiring an established connection for each individual exchange. The content details the architectural and operational constraints that must be met by devices and systems engaging in such virtual call exchanges. By defining these media-related criteria, the text facilitates seamless communication between disparate network environments while maintaining consistency in service delivery. It serves as a reference for implementing standardized interfaces and protocols that support the continuous operation of connectionless services over PSDN infrastructure. The provisions contained herein are designed to harmonize technical implementations across different regions and organizations, promoting a unified approach to network interconnection without addressing specific national variations or proprietary solutions.