The Unpredictable Certainty White Papers (1997) / Chapter Skim
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What the NII Could Be: A User Perspective
What the NII Could Be: A User Perspective
Pages 378-387
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From page 378... ...
Today, these networks appear to the user to be separate and noninteroperable, in the sense that a user cannot reasonably make a telephone call over the Internet or most CATV systems, cannot reasonably watch video over the Internet or the telephone network (except at unacceptably poor levels of quality by entertainment standards) , and cannot send data over the telephone network or most CATV systems (except in the limited sense of using these media for access to data networks or for point-to-point data transmission)
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From page 379... ...
CONNECTIVITY ISSUES I,ogical Connectivity of a Network The most basic property of a network Tom a user perspective is He logical connectivity it offers. The network is said to provide logical connectivity between two access nodes if it is feasible to transport data between Hose nodes Trough He network.
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From page 380... ...
If access nodes are involved, and if for example every access node can send information to and receive information from the remaining nodes, then the connectivity can be thought of as a combination of simplex multisource connections (one to each node) and simplex multicast connections (one from each source)
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From page 381... ...
~ conclusion, greater logical connectivity and more connectivity options offer more value to users and hence make the network service provider more economically viable, In addition, there are natural market forces that favor application service providers that target Lose high~onnectiv~ty networks.
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From page 382... ...
Like multicast forms of broadcast connections, the moving location option requires fundamental capabilities In the network that must be anticipated In its design and provisioning, since connection instances must be dynamically reconfigured. This option makes much more sense for some applications than others.
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From page 383... ...
For example, an isolated user can usefully benefit from a shrinkwrapped personal computer application purchased locally, but in a networked environment may depend on other interested users who have purchased the same application. This can place a daunting obstacle In the way of new applications and I~m~t Me economic return to application vendors or service providers.
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From page 384... ...
There is also a substantial increase In the complexity of the network associated with QOS guarantees. The QOS of the network can sometimes be modified more simply in the access nodes, for example by introducing forward error-correction coding to reduce the corruption probability (at the expense of added delays.
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From page 385... ...
acceptable to the most critical applications will require major attention In the design phase and coordination among the network service providers. Past and present trends are not encouraging in this regard, as many network technologies developed nominally for a limited geographical area have unwittingly introduced substantial delays.
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From page 386... ...
This becomes an issue for both users and network service providers. From a user perspective, the following characteristics of the NH are important: .
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From page 387... ...
. Major cooperation is needed among network service providers to coordinate their design and deployment strategies in areas like end-to-end transport protocols and signaling capabilities that allow dynamic allocation of end-to-end QOS impairments, support scalability and configurability of applications, and provide desired levels of privacy and secunty.
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