4. Transmission Convergence Layer

  1. Dave Hood and
  2. Elmar Trojer

Published Online: 6 JUL 2012

DOI: 10.1002/9781118156070.ch4

Gigabit-Capable Passive Optical Networks

Gigabit-Capable Passive Optical Networks

How to Cite

Hood, D. and Trojer, E. (2012) Transmission Convergence Layer, in Gigabit-Capable Passive Optical Networks, John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9781118156070.ch4

Publication History

  1. Published Online: 6 JUL 2012
  2. Published Print: 21 MAR 2012

ISBN Information

Print ISBN: 9780470936870

Online ISBN: 9781118156070



  • forward error correction (FEC);
  • Gigabit passive optical network (G-PON);
  • optical network unit (ONU);
  • transmission convergence layer


This chapter focuses on optical network unit (ONU)-ID terminology ambiguity, Payload mapping and framing. It then talks about forward error correction (FEC), scrambling and encryption. The chapter also discusses ONU discovery, activation, and delay compensation. It calculates the conveying time of day to the ONU. The chapter then focuses on physical layer OAM (PLOAM) messages and embedded operations channel. It describes the methods by which upstream bandwidth demand is determined and capacity is requested and assigned. Finally, the chapter talks about energy conservation and security. Gigabit passive optical network (G-PON) uses straightforward TDM in the downstream direction. The optical line terminal (OLT) broadcasts all downstream traffic onto the fiber; each ONU selects its own particular traffic in ways described in the chapter.

Controlled Vocabulary Terms

Energy management; forward error correction; optical network units; passive optical networks