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DTE=data terminal equipment DCE=data circuit terminating equipment DXE=data switching equipment
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Figure 12 Traditional carrier model
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U-plane C-plane M-plane
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Figure 13 Site interconnection with traditional carrier model
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1
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To Other Sites and Internet
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Mobile User Mobile User Provider POP
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Figure 14 Real and virtual sites
The role of the service provider is in interconnecting the sites to one another (the intranet), to business partners (the extranet), and to the public Internet Let me introduce the idea of communities of interest (COI), which I find an excellent starting point in understanding overall customer requirements A COI is the set of users of a set of services (Figure 15) It is not hard to explain to
AM FL Y
Here a Miracle Happens
Communities of Interest
E-mail
Product Catalog
Inside Sales
Shipping
Time Reporting (Input Only)
Figure 15 Community of interest
What Is the Problem to Be Solved
2nd 1 s t 1st M e Mile t e r DSL Cable
Wireless
Mile Dial ISPs, Content, Voice, Video Providers
Customer
Campus
Figure 16 New provider model
nontechnical people, but it is definitely a good start for the formal requirements definition discussed in 3 A COI may further be broken down if certain users of the same set of servers have different availability, security, or performance requirements than other users At this stage of the discussion, assume all users within a class have the same requirements This differs from the traditional model of the carrier largely as a point-to-point, or series of point-to-point, links between customer data terminal equipment (DTE) This model has gone through substantial revision, as providers literally transform themselves into service providers and specialize in different parts of the problem Figure 16 shows the basic role of many of these specializations Access providers are a special focus of 7, while IP service providers are detailed in s 8 through 12 Content provider services are in 13
Known Clients to Arbitrary Servers
In the typical case of web surfing for enterprise users, your clients identifiers are known but the identifiers of their desired server destinations are not known until the clients actually request service You have a level of trust in the client identifiers, which may be based on their connecting from a trusted location, or you may trust that they come in from random locations but have passed authentication criteria (see Figure 17) While the popular wisdom speaks of telephone systems as monolithic in comparison with data networks, for all practical purposes they have always
1
Server you advertise
Internet
Your internal network
Figure 17 Known clients to arbitrary servers
been divided into local access and long-distance providers Interprovider operation is an everyday part of the telephone culture, actually to a greater degree than it has been a part of the non-Internet data culture The public Internet, however, not only involves the cooperation of multiple connectivity providers but involves a wide range of content providers
Known Servers to Arbitrary Clients
To do business on the Internet, the server owner makes it accessible to clients that are not known prior to the interaction If the interaction is simply to proPRICING IMPLICATIONS OF CONVERGED NETWORKS The somewhat technically unfortunate term converged networks has come into use to describe networks that provide data, video, and voice services The known client to arbitrary server case is not that dissimilar from the model of telephony, where enterprise telephone users expect to be able to connect to any telephone in the world (see Figure 18) An important differentiator for this model is its price sensitivity Not that any customer is immune to price, but this case is also the basic application for residential Internet users Residential users typically want very low price, but when the network carries voice or entertainment video, consumers are more willing to pay premium prices than for Internet access There is a greater expectation of reliability for these services The higher price tolerance is an incentive for carriers to provide multiple services, which in turn motivates broadband connectivity to the residence See 2 for a discussion of traditional telephony architecture
What Is the Problem to Be Solved
Your users
Figure 18 Telephony metaphor
vide public content (for instance, getting news headlines from CNN), the only level of identification needed is that which is required to return a response to the client (Figure 19) When the application involves credit card charges or other sensitive information, authentication is needed The content provider s security policy needs to make clear whether the authentication is of the human being using the identified host (for example, verifying a credit card number) or if the client host needs also to be authenticated as part of audit controls