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Prof. Giorgio Ventre Studenti Marotta Antonio 885/000484 Sorrentino Maurizio 885/000472 Traficante Nicola 885/000492 Sergio Picirillo 885/000537. What’s Next Generation Access. What is NGN?
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Marotta Antonio 885/000484
Sorrentino Maurizio 885/000472
Traficante Nicola 885/000492
Sergio Picirillo 885/000537
What is NGN?
NGN, next generation networks, is a term referring to the evolution that is interesting telecommunication networks. A Next Generation Network is a packet-based network able to provide telecommunication services to make use of multiple broadband, QoS-enabled transport technologies and in which service-related functions are independent from underlying transport-related technologies.
The objective in the next 5-10 years is to converge all the multimedial services in the IP paradigm.
the bigger concurrency among tlc operators;
the increase of digital traffic;
the intense use of the Internet;
the need for mobility.
It’s expected a great growth of the demand for new services with features of:
It will be possible to introduce new multimedial services that can be personalized according to customer’s needs.
Francesco Caio has a long experience in the telecommunication field:
he was one of the managers who created Omnitel and contributed in the so-called “Omnitel” miracle;
he worked for Olivetti and then for Merloni;
he founded “Netscalibur”;
he managed important English telecommunication societies such as Cable and Wireless.
Caio has become very famous because of the call he received by English prime minister Gordon Brown, who asked him to elaborate a review about the state of English telecommunication system.
The objective was to collect ideas and suggestions for the development of next generation access (NGA) network in the UK.
Brown’s call derived from a practical issue: BBC launched a web-service, called “i-Player”, that has had a great success but has also created some problems for the network. The access was not under stress, but the backhaul was: it is the central part of the network and the point where there is less concurrency. There was a big preoccupation about the inadequacy of the network for supporting new services that deal with videos. The big question risen, was if market could support the development of the infrastructure in order to guarantee the born of new services; another issue concerned the government’s intervention in support of the investments in optical fiber.
The studies and the researches proved so far that the existing infrastructure, based mainly on ADSL, is very appropriate for the application based on the web. So there is no worry about the presence, because the network is sufficient today, but you cannot say so in the future.
The Caio Report is to be intended as a review of how to use NGA to invest in its development. Using NGA, the advantages that can be exploited are faster and more reliable downloads speed, a lower latency and a greater degree of symmetry between the down- and up-links for the end user.
Fiber access networks are often described according to the nature of three variables:
Nature of components: they can be active or passive. An active component of a broadband network is usually a piece of electrically-powered switching equipment which manages signal distribution and directs signals to specific customers. Passive component of the network refers to physical infrastructure needed to carry the signal to different points of the network.
Extent of fibre reach:
FTTH, “fibre to the home”, that extends from the core network to the premises (speed of
FTTC, “fibre to the cabinet”, in which fibre connections only reach street cabinets and
copper provides the connection from the street cabinet to the home (speed of 24-50 Mb/s).
Network configuration and design: FTTH networks have two main types of configuration:
point-to-point (P2P), in which a single dedicated fibre runs from each home;
Passive Optical Network (PON, the most common variant of which is GPON) in which bandwidth
is shared between users in a series of thinning pipes, and directed via optical splitters.
-Services e.g. voice, broadband, TV
-Active transport and switching of traffic.
-Passive dark fibre, ducts, etc.
The development of NGA and, in particular, of fibre-based access networks, poses a series of challenges in term of large investment:
the cost of deploying fibre access using FTTH/P2P (i.e. a single fibre to each home) on a national basis is almost £29 billion;
a GPON configuration (in which a fibre connection is shared between several homes) would cost around £24.5 billion;
if fibre was deployed only to street cabinets (FTTC), the cost would be around £5 billion. FTTC would though deliver a lower level of performance.
UK has a leading role in the development of NGA:
the UK enjoyed a rapid growth in broadband penetration between 2003 and 2007. There are now over 16 million broadband lines in the UK;
the UK is now among the world leaders in broadband coverage, with 99.6% of homes connected to an ADSL-enabled exchange;
the UK has high levels of digital TV take-up through satellite, cable, and digital terrestrial television;
consumers of broadband are the most active users of the internet in Europe, and are among the biggest contributors to the online economy.
The principle actors in this development are:
In July 2008, BT announced plans to invest £1.5 billion over five years on an NGA network that will deliver download speeds up to 40 Mb/s to 10 million homes by 2012. The deployment will involve a mix of fibre-to-the-home (FTTH) and fibre-to-the-cabinet (FTTC).
There are differentsinitiativesthatgovernmentshould put in placenowforsupportroll-outof NGA. The initiatives can be clustered in three groups.
Most of internet-based video streaming have needs in terms of bandwidth that can be accomplished by normal DSL connections (300-500 Kb/s). The core and backhaul networks of ISPs around the world were designed to support the pattern of use typical of web browsing (short burst of data flowing primarily in one direction) or continued streaming of relatively narrow band applications.
Anyway the first steps have been made:
There was the first operational meeting in Rome of Italy NGN Committee, which approved
the plan of activities and launched the idea of a multi-operator trial program to promote
the rapid development and sharing of NGN (Next Generation Networks) in Italy.
The plan, as agreed, will be continued through five thematic groups: