On 09/07/18 08:58, Rohan McLeod via luv-talk wrote:
Andrew McGlashan via luv-talk wrote:
On 09/07/18 02:31, Jason White via luv-talk wrote:
Julien Goodwin via luv-talk <luv-talk@luv.asn.au> wrote:
By the way, 31Tbit really isn't that fast, 200Gbit/wave * 96 waves (a hair under 20T) is in field deployment using kit from the major DWDM vendors (such as ALU). Whether there's any networks actually populate their links that big I doubt, but as an example, the last time they released numbers (several years back) Comcast had inter-city links of 800g in the US, they're likely up to at least 2-3T these days. I don't know how fast the fibre connections are, but Comcast are giving me 300MBPS downstream over Docsis 3, and achieving it, according to my speed tests. This is a fairly recent upgrade.
If I had a Docsis 3.1 modem, it might be faster. Fiber can do much better, but Docsys isn't bad for most people -- keep in mind though that the cable is "shared", if your neighbors are busy using the bandwidth, you /may/ be starved from it.
Well ; as far as I know " fibre-to-the-house" ; which I had in Brunswick is unshared; the installing technician was even kind enough to show me the inside of the street-box; where in one direction the many fibres went to the exchange and the other went to individual, houses. Even the 'expletive deleted' fibre-to-the-node where the connection from street-box to house, is the old Telstra copper is unshared. Of course between exchanges the fibre is multiplexed so there will still be observable, slowing in the DTR between peak and off peak. Perhaps you are conflating it with the old Optus overhead fibre , where neighbours were ( are ?) multiplexed ?
Well...... with Fiber using GPON [1], there are shared links coming off for a group of connections. At the end of the day, there will be a congestion point, somewhere (typically) -- it might be a local link before the ISP or beyond the ISP. If everyone with a GPON FTTP link wants to fully utilize their top speed of 100/40, then there will be contention. But, chances are too many fully active connections at that point will be a problem. Fiber all the way would be great, but never likely to happen for homes. ISPs pay NBN for so mnay Mb/s "pipes", if they don't buy enough MB/s (ala, the pipe is too thin), then there will be more congestion no matter what type of technology connects you to the network. At peak times, no ISP is expected to offer everyone full speed either, at least not with "residential" grade product. Business grade product may offer full 1:1 and therefore no contention ... but the ISP still needs upstream links to match to bandwidth requirements. [1] http://www.gpon.com/how-gpon-works Cheers A.