Connectivity on the XO
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The document discusses the networking capabilities and principles of One Laptop per Child (OLPC) laptops. It describes how OLPC uses WiFi networking and builds a mesh networking layer on top to allow collaboration between students. The mesh networking extends the range of WiFi and allows students' laptops to communicate directly to share documents and interact, without needing an internet connection. It compares mesh networking to traditional WiFi and how both use the same radio spectrum but mesh extends WiFi connectivity and does not replace it. Schools would still use WiFi access points connected to servers while the laptops can communicate via their built-in mesh networking.
Connectivity on the XO
- 1. One Laptop per Child Networking One Laptop per Child
- 2. Principles Learning happens by interacting as much as it happens by teaching => child2child as important as child2internet
- 3. Our approach Standard WiFi network adapter Mesh Networking built on top of that
- 4. Our approach Collaboration software (middleware, applications and UI)
- 5. OLPC Mesh Design Goals low power consumption as transparent as possible to applications based on standards Connectivity/Range Does NOT replace Access Points – It complements them
- 6. XO Networking Architecture AMD LX700 CPU Marvell 8388 SoC Radio USB 2.0 Bus Layer 2: Frames Layer 3: Packets
- 7. Collaboration The ability of students to share documents and directly interact with one another Requires a network connection between the student’s laptops: Traditional Wireless (802.11b/g) Mesh Wireless (802.11s) Possibly long distance
- 8. Mesh vs. WiFi The wireless mesh (802.11s) is an extension of traditional WiFi (802.11b/g) Both use the same radio spectrum 3 usable channels around 2.4GHz Wireless mesh devices (the laptop) interoperate with WiFi devices Mesh does not replace WiFi (it extends it) WiFi should be used at Schools
- 9. School WiFi One or more WiFi (802.11b/g) access points, connected to a central switch and school server
- 10. Do it yourself
- 11. Active Antennas
- 12. Connectivity Principles kids are a mission, not (yet) a market bandwidth is perishable – there is excess capacity 99.99% availability is not always necessary bottoms up along with top down electricity is scarce
- 13. Means of Connectivity OLPC is technology agnostic when it comes to connecting schools and kids to the Internet Wireline, Wireless, Satellite are already and will be used to achieve our connectivity goals. Examples: Reaksmy, Cambodia: Two-Way Satellite backhaul, local WiFi distribution between 3 schools, WiFi access within the school Cardal, Uruguay: DSL backhaul, Pre-WiMax point-to-point distribution link, WiFi and Mesh access within the school and the town
- 15. Example: Cellular Operator (with added point to multipoint distribution radios)