Presentation 29,30

NGN次世代ネットワークに関するものが、二つ。

Presentation 29
Migration to NGN Access Networks
Eli Lotan CTO, VP R&D
Teledata Networks Ltd.

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Market and technology forces are driving the transformation of circuit switched networks to converged packet networks. VolP technology is maturing and Class 5 replacement is starting to gain real traction in the telecom market. In parallel, the traditional outlook of incumbent Telcos and networks' operators is changing from voice services suppliers to multimedia and Video services, including TV and Video on Demand.

The presentation will include the following topics: A brief description of the main factors driving the operators to evolve to next generation network and Class 5 replacement. Different evolution strategies and optional NGN Network architectures. Description of the Access Gateway role in Class 5 replacement and network evolution towards triple play services.

The IMS-IP Multimedia Subsystem network architecture, standardization and the role of international forums' in the convergence of services into one solution. The Co-existence of various protocols and technology mixes, such as H.248 and SIP in voice applications, IGMP in TV multicast applications, etc. Leveraging the current copper infrastructure and building an overlay of fiber infrastructure in Fiber To The Home (FTTH) architecture.

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Presentation 30
GPON-The Next Big Thing in Optical Access
Oren Marmur
FlexLight Networks

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This presentation contains a comprehensive review of the various Passive Optical Network (PON) technologies in the marketplace today, namely APON, EPON and GPON, and draws an in-depth comparison between them. Following a review of the history of the various PON flavors, as well as the service requirements set forth by service providers, the emerging ITU-T G.984 series Gigabit PON (GPON) technology is examined in detail.

System performance between the various protocols is compared using efficiency and scalability factors, and conclusions are drawn as to the overall throughput efficiency of and cost influence on the solution. GPON carries a two-fold promise of both higher bit rates and higher efficiency when carrying multiple services over the PON.

It offers a scalable framing structure from 622Mbps to 2.5Gbps, as Well as support for asymmetric bit rates, exceptionally high bandwidth utilization for any type of service and GPON Encapsulation Method (GEM) encapsulation of any type of service (both TDM and packet) onto a synchronous transportprotocol.

It is shown that in the WOrst-case scenario, based upon the most conservative assumptions regarding traffic distribution, GPON is substantially more efficient, with an overall efficiency of 93% compared to 71% with APON and 49% with EPON.

Using a more detailed analysis based upon a traffic model provided by the service providers within the full service access networks (FSAN) consortium, it is shown in quantitative terms that GPON offers exceptionally higher bandwidth for the entire range of applications when compared to both APON and, especially, EPON, resulting in substantially lower cost per bit and a much faster payback period.