Hello all
May I add the following. - Even a single mode fibre can do Tbps. Limitations are the cost and availability of the electronic equipment to extract the data at the end points. The latter will evolve with innovation. The reason why fibre can do Tbps is because of the available bandwidth in the optical range. There is also multimode optical fibre communications. My guess is that, like WiFi routers, that end point equipment will one day become a routine upgrade. But can only happen if we first trench the fibre. - Wireless is heading toward 5G (timescale 5 years). 5G KPIs can be seen here (a random website): http://www2.ece.gatech.edu/research/labs/bwn/5G_systems/index.html Table 1 5G Requirements Performance Indicator Value Peak Data Rate 10 Gbps Latency 1 ms Number of devices 1000x Energy Efficiency 10x improvement Reliability Very High Given the fact that 80% of mobile traffic originates in-doors, one way to achieve these KPIs with wireless is to use either WiFi or FEMTO cells to connect mobiles to the local fixed line (fibre) backhaul. In 5G this approach is referred to as densification. Wireless will keep pace with fibre for some time too because currently vacant radio bands under investigation in the 100s of Ghz range have much more spectrum than today's bands. ( of course densification and GHz waves favour short range users :( ) Thus even the 'mobile future' requires a FTTP network. Gerard ________________________________________ From: Link <link-boun...@mailman.anu.edu.au> on behalf of JanW <jw...@internode.on.net> Sent: Saturday, February 27, 2016 9:15 AM To: link Subject: Re: [LINK] How fast is the NBN? At 05:07 AM 27/02/2016, Frank O'Connor wrote: >And no matter what you say … the range of radio frequencies (and hence >cchannel and data carrying capacity) is vastly limited compared to it’s >electromagnetic cousin, light. And that doesn’t even begin to look at >problems of scalability, interference, cross channel interference, range, >error and other quality issues that WiFi incurs - as well as a host of the >other issues that others have raised (power, maintainability, repairability, >technology mix issues and the like) Great point, Frank, about the capacity. And isn't it true that because the fibre frequencies are contained, the frequencies are reusable if in distinct fibre cables, no matter what the wavelength, unlike wifi which requires physical separation by distance to avoid overlap interference? That is a BIG bonus, especially for high density living environments with individual 'message packet' needs. You sort of say that above. I was just thinking about how it's all about frequencies, the light spectrum being part of it that happens to travel well in the glass medium. Whatever happened to future proofing? Mal T just 'past-proofed' Australia. Gee thanks. Jan I write books. http://janwhitaker.com/?page_id=8 Melbourne, Victoria, Australia jw...@janwhitaker.com Twitter: <https://twitter.com/JL_Whitaker>JL_Whitaker Blog: www.janwhitaker.com Sooner or later, I hate to break it to you, you're gonna die, so how do you fill in the space between here and there? It's yours. Seize your space. ~Margaret Atwood, writer _ __________________ _ _______________________________________________ Link mailing list Link@mailman.anu.edu.au http://mailman.anu.edu.au/mailman/listinfo/link _______________________________________________ Link mailing list Link@mailman.anu.edu.au http://mailman.anu.edu.au/mailman/listinfo/link
