1. Powerline By Yong Soo Deutschle & Sebastian Graf

2. Table of contents History of PLC Transmission media The last mile Regulations Powerline in the OSI-Model Digital Powerline Protocol Spread spectrum Powerline Exchange Protocol Future aspects Conclusion

3. Introduced in the 1920s –Energy providers Used in the power automation (high voltage lines) Later on used for control of street lightening Home use started in 1980s –Baby phone Today : new alternative for „the last mile“? History of PLC

4. Transmission media Low & high voltage net was assigned to carry energy Reason for basic problems concerning data transfer –Big noise –High absorption –Huge distortion Needs repeaters every 300 –600 meters (last mile)

5. The last mile consumer outdoor master indoor master PL Modem

6. Regulations Europe: –CENELEC: Data communication in low voltage networks only up to 148,5 khz USA & Japan: Up to 540 khz

7. Powerline in the OSI-Model 4 Transport 3 Network 2 Data Link 1 PhysicalDPL (Digital Powerline Protocol) PLX (Powerline Exchange Protocol)

8. Table of contents History of PLC Transmission media The last mile Regulations Powerline in the OSI-Model Digital Powerline Protocol Spread spectrum Powerline Exchange Protocol Future aspects Conclusion

9. Digital Powerline Protocol Narrow spectrum Usage of very narrow „spectrum gaps“ is possible Uses high levels Bit error ratio = 10 -9  chimney concept

10. Spread spectrum concept Signal is spread over a huge frequency spectrum Non-sensitive for conduction bound interfering signals Uses low levels Very expensive to implement

11. Powerline Exchange Protocol Covers the layers 2,3,4 of the OSI-Model Hybrid MAC-protocol –Ethernet –Token Ring –Wireless LAN –CEBus Datagram Sensing Multiple Access (DSMA) –Adapted from CSMA

12. Future aspects Internet usage: –2 providers left: MVV Energie AG –Product name : Vype DREWAG –Product name : PowerKom

13. Future aspects DREWAG PowerKom availability

14. Conclusion + no additional cable installation required + high flexibility + adaptable to all power networks + high bandwith (theoretical up tp 20 Mbit/s)

15. Conclusion -no security -high technical equipment needed -high costs -no standards -Incompatibilities between USA & Europe -Problems in regulation of frequencies

16. Questions?

17. Questions Which are the two concepts of PLC data transmission? –Chimney –Spread Spectrum

18. Questions Which layers in the OSI-Model are covered by PLX? –Data Link, Network, Transport (2,3,4)

19. Questions What is the last mile in the PLC? –The way from a outdoor master to the end consumer

20. Questions What is DSMA and how does it work? –Datagram Sensing Multiple Access –Adapted from CSMA. –First listen – then send.