PLT Interoperability Event

The Powerline Telecommunications Plugtests™ event provided a unique opportunity to test the coexistence of VDSL2 and PLT technologies. The tests consisted in measuring the performance of a emulated VDSL2 access network coupled to an in-house PLT network that distributes high speed video streaming from the VDSL2 gateway to the HD set-top box.

VDSL2 is seen by many operators as complementary to a fibre rollout where the last section of the access network is using the telephone line. This is the case for FTTB (building), FTTN (cabinet) and FTTEx (central office) deployments. In all three deployment scenarios, the available copper telephone lines are used to carry high-speed services to the end user.

Today the Powerline technologies are designed to deliver high definition audio and video streams in the home. PLT provides a high quality link between the gateway and the set-top-boxes. It is an easy and robust solution to build a local area network distributing triple play applications within the home.

These two technologies are seen by the major network telecom operators as complementary solutions to deploy triple play HD services: the first one, VDSL2, is designed for the access network, and the second one, PLT, is designed for the in-home network. Thus they require equivalent performances and Quality of Services (QoS).

Nevertheless, both technologies are using different signal modulation techniques in a common frequency band up to 30MHz. The signals are generated over different qualities of cables with part of them that could be co-localized. So it is predictable that some rules, techniques and/or tools that guarantee a good coexistence between these two technologies have to be built.

The aim of this event was to analyse how VDSL2 and in-door PLT do coexist in various configurations and topologies, which will help in the definition of these rules and tools.

The results of this Plugtests were eagerly awaited by major European telecom operators in order to deliver their high definition video services using PLT technology.

Number of participants
7 participants from 6 companies.