The present document specifies the technical requirements and test principles for connection characteristics of Open Network Provision (ONP) 2 048 kbit/s digital structured leased lines. The leased line operates at 2 048 kbit/s and provides an information transmission capability, without restriction on binary content, of 1 984 kbit/s. The remaining 64 kbit/s provides an 8 kHz framing structure in accordance with ETS 300 167 and ITU-T Recommendations G.704 and G.706.