V-Interfaces at the Service Node (SN): VB5.1 Reference Point Specification - Series G: Transmission Systems and Media Digital Systems and Networks - Digital Transmission Systems - Digital Sections and Digital Line System - Digital Section and Digital Tran
This Recommendation specifies the physical, procedural and protocol requirements for interfaces at the VB5.1 reference point between an Access Network (AN) and a Service Node (SN) with flexible (provisioned) Virtual Path Link (VPL) allocation and flexible (provisioned) Virtual Channel Link (VCL) allocation (controlled by the Q3 interfaces) at the VB5.1 reference point.