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Triple Play – a Survey Triple Play – A survey ECE776 - Spring ’06 project Panos Kampanakis, Mike Kallitsis, Savitha Sridharan, Professor Mike Devetsikiotis Electrical and Computer Engineering Department North Carolina State University, Raleigh, NC 27695 {pan_kamp, kallitsis, ssridha}@ncsu.edu Abstract 2. Triple Play – Overview Service providers are competing to take advantage of the The Triple Play service is a marketing term for the rapidly-developing market for Triple Play services, a provisioning of three services; high speed Internet, service that aims at achieving integration of voice, video television (Video on Demand or regular broadcasts) and and data communication, over both fiber and copper, with telephone service over a single broadband connection. scalability at an optimal cost. In addition, technology Today, Triple Play services are offered by cable television providers are aiming at providing these services over operators as well as by telecommunication operators. These wireless media, commonly referred to as Quadruple Play. two kinds of operators are competing each other. IPTV, VoIP and high-speed Internet access are some of the Telephone local exchange carriers (LEC) deliver Triple key services provided by key technology-providers like Play using a combination of optical fiber and digital Alcatel, Juniper and Nortel Networks. subscriber line (DSL) technologies, called fiber in the loop In this article, we study the basics of triple play and (FITL). This means that carriers use optical quadruple play services and a few common applications. communications to connect distant locations and use DSL Then, we study a popular triple play architecture. The over the existing Plain Old Telephony System (POTS) research also includes study on the pricing model adapted twisted pair technology to achieve the last mile access to to support triple play services followed by a simulation the subscriber's home. On the other hand, cable companies study on OPNET 11.5 to analyze and understand QoS use an architecture called hybrid fibre coaxial (HFC) to parameters, i.e. end-to-end delay and jitter experienced by reach the subscriber's home. This technology uses coaxial voice, video and data traffic as they traverse routers cables instead of twisted pair cables for the last mile configured with various scheduling policies. transmission standard to the subscriber [1]. Delivering video using DSL over twisted pair is a 1. Introduction booming technology called IPTV. Here, video is streamed Triple Play is a combined offer which includes voice, to the subscriber using the MPEG-2 (and soon MPEG-4) video and data. However, the emphasis is on delivering format. On the contrary, on an HFC network, television video through a digital broadband network as part of a may be a mixture of analog and digital television signals. A bundled offering. Delivering TV is the basic challenge of device called Set-Top-Box is used by the subscriber to telecommunication operators interested in deploying and control and order video services, like video on demand. enhancing their networks to offer Triple Play services. In Internet data can be delivered using ATM or DOCSIS (Data this survey, we will concentrate on the video service of the Over Cable Service Interface Specification). Voice can be Triple Play and especially video delivered with different distributed in two ways; using the traditional POTS DSL technologies. This service is called Internet Protocol interface or using Voice over IP (VoIP). TV (IPTV) and the last few years it is a very popular term Some service providers are considering new architectures in the telecommunications industry. using Ethernet and fiber to the home (FTTH). Supporting In our days, it is obvious that traditional tele- Triple Play Services in such way has the advantage of communication companies that have been providing voice bypassing the need of broadband transmission using the and/or data services are being interested in provisioning TV legacy network. Upgrading the legacy network to provision entertainment too. This is something essential to them since broadband transmission is not considered a wise idea due to the antagonism with cable companies would probably take the tremendous cost required for such activity. them out of the market. As a result, the turn to IPTV is not Triple play has generated a closely related term called only a matter of profit; it has to do with their maintenance Quadruple play. In Quadruple play voice, data and video in the telecommunication arena. Therefore, offering this are delivered using the wireless medium. Next generation combination of services can convince costumers not to be networks like UMTS allow operators to distribute the lured away by other providers. aforementioned services efficiently. A new term named multi-play is used to describe both triple and quadruple services. In addition, we should also have in mind the Quality of wireless are being considered to deliver video. IPTV can be Service requirements of Triple Play services. Using a delivered using digital broadband networks like ADSL shared network like DSL or cable, QoS mechanisms are (Asymmetric Digital Subscriber Line), VDSL (Very High inevitable. It is well known that voice, video and data have Bit-Rate Digital Subscriber Line), fiber and wireless LMDS different characteristics that operators have to have in mind (Local Multipoint Distribution Service). As we see, it has in order to deliver the desired services complying to the nothing to do with the traditional cable or broadcast and Service Level Agreements (SLAs) and the requirements satellite TV that we are familiar. Deploying video-over- that subscribers pay. DSL (i.e. video over phone lines) is the usual way for telecommunication providers to fend off the triple play 3. Types of 3P Services choice from cable operators and thus we will concentrate In this section we will give a description for each service with DSL in our discussion. of the triple play. However, our attention will be focused in delivering the TV service. As a result, we focus our 3.4 Quadruple Play analysis in IPTV; we believe that effectively transmitting A Quadruple play service is the little brother of the Triple video is the greatest challenge. Later, we continue with a play. It combines the triple services (high speed internet, brief review of the other two services, i.e. VoIP and Data. voice and video) with wireless services. When we say Finally, an introductory section to Quadruple Play services wireless services we do not only mean having a cellular- is discussed. like service; rather it is the ability to have wireless access to all the aforementioned services. Given the advancements in 3.1 Data services WiMax (Worldwide Interoperability for Microwave Data services refer to activities familiar to all of us like Access) the ability to transfer information over a wireless web browsing, file downloading, e-mail, electronic link at combinations of speeds, distances and non line of purchases, electronic games and other applications using sight conditions is rapidly improving. WiMax is a wireless high-speed Internet. technology that has the ability to provide broadband connections over long distances. Moreover, advances in both CDMA and GSM standards, utilizing 3G, 4G or 3.2 Voice over Internet Protocol UMTS allow the service operators to enter into Quadruple Voice over Internet Protocol (VoIP), is a technology that Play and gain competitive advantage against other allows us to make telephone calls using a broadband providers. A scenario of Nortel’s Passport Solution to Internet connection instead of a regular (or analog) phone achieve the quadruple play is shown in Figure 1[13]. line. VoIP enables telephone calls through a data network like the Internet. It converts the voice signal from the telephone into a digital signal that travels over the Internet and then converts it back at the other end so we can speak to anyone with a regular phone number. Some signaling protocols used for internet telephony are the Session Initiation Protocol (SIP) and the H-323 protocol. 3.3 IPTV Traditional telecommunication providers need to protect and increase their market share. The more serious reason that phone companies are considering video over the phone lines is to ensure their own survival. This is why the idea for Internet Protocol TV was born. Voice providers have to Figure 1: Nortel's Passport Solution compete with the cable providers. Cable companies are considering providing communication to their customers 3.5 Network Transformation besides entertainment. They intend to capture millions of Triple play faces some new network challenges. voice subscribers who are interested in long distance and Deploying the aforementioned services requires some international voice calls. Cable providers entice their significant changes in today's network architecture. Triple customers with voice over Internet Protocol (VOIP) so as to play services are not like traditional Internet services. achieve that target. Cable operators' ambition is based on Traditional Internet is “best-effort” service. This means that the fact that the customers are willing to take the bundle of due to the fact that users are not online the same time, services they provide (video, voice, data) because it is more aggregating traffic from multiple users increases network convenient and more valuable. As a result, traditional efficiency. However, triple play includes real-time services, telecommunication operators had to find the antidote for like voice and video. These kinds of services have strict that movement. Thus, their response is to try to provide and-to-end delay, jitter and bandwidth requirements. entertainment beside communication to their customers. Therefore, we cannot treat triple play services as “best- Different access methods like fiber, copper and soon effort” services. If a real-time service confronts packet 2 delay or packet loss the connection is instantly dropped. technology and a user's distance from the closest Central From the above discussion it is obvious that a network Office should be less than 18000ft.
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