Content Distribution Architecture: Difference between revisions
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== Taxonomy == |
== Taxonomy == |
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=== Network === |
=== Network === |
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There are a number of different networking technologies; these share different fundamental capabilities. These include: |
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# Broadcast only - it may be broadcast only (e.g. video channels, or vertical retrace based data traffic) |
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# Multicast - does the technology support multicast traffic (traffic can be grouped as to interest) |
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# Unicast - does the technology support unicast connection. |
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==== Connectivity ==== |
==== Connectivity ==== |
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==== Latency ==== |
==== Latency ==== |
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# Low - what is experienced in most of the developed world, using broadband technologies. |
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# High - Some wireless technologies impose high latencies, often since data has been an afterthought in either the wireless technology or in the wireless deployment. In addition, one or more satellite links are common in some countries. |
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==== Capacity ==== |
==== Capacity ==== |
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==== Regulatory ==== |
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In some countries, there may be additional issues that ensue due to regulatory constraints. For example, there are countries which signed extremely poor wide area peering agreements in the past, such that bandwidth out of the country is hideously expensive, putting an extremely high premium on in-country mirroring of content. |
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An other example is where there is no in-country peering between ISP's, sometimes resulting in international back-haul being the norm for interoperation between ISP's operating in country, rather than the exception. Longer term solutions are up to the local governments involved; organizations like the [http://pch.net Packet Clearing House] may be very useful to tap the expertise required to restore sanity to such network situations, though the country involved will also need to *want* to solve these problems, as the economic interests of the ISP's may not map to the interests of the country involved. These interests go well beyond Ministries of Education, so proper solutions may be time consuming and politically difficult. Note that in this example, such situations may complicate content distribution, requiring multiple delivery networks. |
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=== School Type === |
=== School Type === |
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==== Small Rural Isolated ==== |
==== Small Rural Isolated ==== |
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==== Small Rural |
==== Small Rural clustered ==== |
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==== Town ==== |
==== Town ==== |
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==== City ==== |
==== City ==== |
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--[[User:Jg|Jim]] 17:34, 30 July 2008 (UTC) |
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Revision as of 17:34, 30 July 2008
Content Distribution Architecture
Taxonomy
Network
There are a number of different networking technologies; these share different fundamental capabilities. These include:
- Broadcast only - it may be broadcast only (e.g. video channels, or vertical retrace based data traffic)
- Multicast - does the technology support multicast traffic (traffic can be grouped as to interest)
- Unicast - does the technology support unicast connection.
Connectivity
Latency
- Low - what is experienced in most of the developed world, using broadband technologies.
- High - Some wireless technologies impose high latencies, often since data has been an afterthought in either the wireless technology or in the wireless deployment. In addition, one or more satellite links are common in some countries.
Capacity
Regulatory
In some countries, there may be additional issues that ensue due to regulatory constraints. For example, there are countries which signed extremely poor wide area peering agreements in the past, such that bandwidth out of the country is hideously expensive, putting an extremely high premium on in-country mirroring of content.
An other example is where there is no in-country peering between ISP's, sometimes resulting in international back-haul being the norm for interoperation between ISP's operating in country, rather than the exception. Longer term solutions are up to the local governments involved; organizations like the Packet Clearing House may be very useful to tap the expertise required to restore sanity to such network situations, though the country involved will also need to *want* to solve these problems, as the economic interests of the ISP's may not map to the interests of the country involved. These interests go well beyond Ministries of Education, so proper solutions may be time consuming and politically difficult. Note that in this example, such situations may complicate content distribution, requiring multiple delivery networks.
School Type
Small Rural Isolated
Small Rural clustered
Town
City
--Jim 17:34, 30 July 2008 (UTC)