Ultra-Fast Broadband

1. Ultra-Fast Broadband By Elliot Paton-Simpson

2. Ultra-Fast Broadband Owairaka and the surrounding region has decided to install an ultra-fast broadband. The network spans areas and has certain broadband towers located near certain spots. It will cost a lot of money and the council wants to keep costs to a bare minimum... To do so, the minimum time must be spent on installing the optical fibres. The graph in the following slide shows the towers' location.

3. Plant Barn 2.5km 1.2km 0.8km Rocket Park Unitec 2.3km 1km St Luke's 0.7km 3.3km 2.3km 1.7km Mt Albert Grammar School 2.2km MOTAT 4.7km 1.4km Mt Roskill Grammar School 3.4km 2.8km 5km 1.8km Gladstone Primary Owairaka Domain 4km 3.9km 2.4km 3.6km 2.1km 2.3km Avondale College Owairaka Park Pak'nsave 1.8km

4. Minimum Spanning Tree • Because of costs, the council would like to start off by having the bare minimum amount of optic fibre to run the broadband, then would install the other paths later. To do this they must use a minimum spanning tree to figure out the shortest possible connection that joins all the broadband towers. • The method used is repeatedly by finding the shortest distance and if it does not loop into the new graph add it to the new graph. Eventually, you should join all the vertices.

5. Plant Barn The total distance is 20.3km All vertices have been joined. 2.5km 1.2km 0.8km Rocket Park Unitec 2.3km 1km St Luke's 0.7km 3.3km 2.3km 1.7km Mt Albert Grammar School 2.2km MOTAT 4.7km 1.4km Mt Roskill Grammar School 3.4km 2.8km 5km 1.8km Gladstone Primary Owairaka Domain 4km 3.9km 2.4km 3.6km 2.1km 2.3km Avondale College Owairaka Park Pak'nsave 1.8km

6. The starting route Now the council has the opportunity to gain enough profit before continuing with the full installation. This will save a lot of money but will still be satisfactory in including all of the required vertices.

7. Traversable or Not? • Unfortunately, certain streets will undergo road works and a paper boy has to travel on every route, travelling the shortest distance possible that goes on every path.The boy is paid depending on the distance he travels and the council would prefer to pay the smallest amount possible. • If the graph is a Eulerian trail or a semi-Eulerian trail, it is traversable. Otherwise it is not traversable and must find a way to cover all routes with the shortest possible excess distance.

8. Key • - Odd Vertice • - Even Vertice Plant Barn 2.5km 1.2km 0.8km Rocket Park Unitec 2.3km 1km St Luke's 0.7km 3.3km 2.3km 1.7km Mt Albert Grammar School 2.2km MOTAT 4.7km 1.4km Mt Roskill Grammar School 3.4km 2.8km 5km 1.8km Gladstone Primary Owairaka Domain 4km 3.9km 2.4km 3.6km 2.1km 2.3km Avondale College Owairaka Park Pak'nsave 1.8km

9. Not Traversable!!! • The graph is not traversable. To be traversable it either must have no odd vertices or 2 odd vertices. This graph has 4 odd vertices. This means that we will have to add in an extra path. The shortest way to travel across every path is to add in another path that is the same as the other, that turns two odds to an even… • In this case we should add a path between Plant Barn and St Luke’s, only giving 1.2km extra distance to travel. Now Mt Roskill Grammar School and Owairaka Park are the only odd points. Therefore they will be the starting and finishing points.

10. Key • - Odd Vertice • - Even Vertice Plant Barn 1.2km 2.5km 1.2km 0.8km Rocket Park Unitec 2.3km 1km St Luke's 0.7km 3.3km 2.3km 1.7km Mt Albert Grammar School 2.2km MOTAT 4.7km 1.4km Mt Roskill Grammar School 3.4km 2.8km 5km 1.8km Gladstone Primary Owairaka Domain 4km 3.9km 2.4km 3.6km 2.1km 2.3km Avondale College Owairaka Park Pak'nsave 1.8km

11. The Paper Boy’s Path • The paper boy follows this route: • Owairaka park → Pak’nsave → Avondale College → MOTAT → Pak’nsave → Owairaka Domain → Owairaka Park → Mt Roskill Grammar School → Owairaka Domain → Gladstone Primary → MOTAT → Owairaka Domain → Mt Albert Grammar School → MOTAT → Unitec → Plant Barn → St Luke’s → Plant Barn → Rocket Park → Unitec → Mt Albert Grammar School → Rocket Park → St Luke’s → Mt Albert Grammar School → Mt Roskill Grammar School • The path is 58.4km long, 1.2km longer than all the routes added together. • This isn’t bad as 1.2km probably would only cost a minor sum of money.

12. Shortest Path An repairman from Unitec must travel to Owairaka park to fix one of the Broadband towers. Due to time being money, the council wants him to spend the least amount of time to travel to Owairaka park. To do so, he must find the shortest way to reach Owairaka park.

13. St Luke’s Owairaka Park Owairaka Domain Avondale College Plant Barn Owairaka Park Plant Barn 3.7km MAGS 12km 7.6km 4.5km 8.1km 10.9km 5km Rocket Park MOTAT 2.5km Pak'nSave 9.4km St Luke’s 5.8km 3.3km 3.3km Plant Barn Rocket Park 3.1km Mt Roskill Grammar School Mt Roskill Grammar School Owairaka Park 2.3km 6.1km MAGS 7km Rocket Park 8.7km 3km Unitec St Luke's 3km MOTAT 4km MAGS 8.3km Owairaka Domain 2.3km 3.7km Gladstone Primary 5.5km Pak'nsave 6.9km MOTAT 4.5km MOTAT Avondale College Owairaka Domain 3.3km Gladstone Primary 7.3km Pak'nSave MAGS 6.7km 9.6km 5.5km 6.1km

14. The repairman takes the path: Unitec → Mt Albert Grammar School → Owairaka Domain → Owairaka Park The one thing is that he doesn't have to travel along the Broadband cable routes and could travel by road with half the distance. The Repairman's Destinations.

15. Conclusion The broadband cable installation went ahead as planned and was highly profitable. There were no complaints from any of the affected households and it was money efficient. The main problem was that the repairman could quite have easily taken a direct route to Owairaka Park instead of stopping off at other places on the way.