Carriers are moving to a new paradigm. As traditional voice revenues fall and competition increases, carriers are bolstering income with new data applications, and bundled “triple play” voice, video and data services. This bundling of service is driving demand for more bandwidth in the access market, and pushing new services to consumers.

As a bundling option, fiber-based access is taking the lead. Fiber-to-the-X (curb, premise, building, house)
service delivers speeds hundreds of times faster than premium data services, and allows users to use multiple
phones lines, access video on demand, receive high-definition television and more.

Passive Optical Networks (PON) are becoming the medium of choice for most carriers. In recent years, U.S.
carriers have been building out BPON (Broadband Passive Optical Network) networks to the home. This
work will accelerate and these networks will be replaced by Gigabit PON (GPON) networks. In Asia, Korea Telecom is deploying Ethernet PON (EPON) networks, while in Japan NTT has announced the conversion of 30 million lines to Gigabit Ethernet PON (GEPON).

In the march towards these “new” technologies, one significant issue remains. How do carriers cost-effectively transport existing, revenue-generating TDM traffic across the new packet-based network? This paper will present Circuit Emulation Services over Packet (CESoP) as a viable solution that allows carriers to migrate towards a PON architecture that easily supports legacy services.