On 16/06/2014 8:52 AM, zlinw@mcmedia.com.au wrote:
Erik Christiansen <dvalin@internode.on.net> said,
Here in Tecoma (Dandenong Ranges), my ISP (Internode) provides ADSL2+. Is it a rural exchange which would limit it to ADSL1, or the 5 km line length?
Erik
Im practice it would be line length. As far as I am aware ADSL uses line frequecies up to around 1mhz, ADSL 2 to around 2.2 mhz. Special 1.27mm copper carrier cable has a loss at 1.6mhz of around 30db for 5 kilometres. One would expect most customer cable would be around double that. Such a loss would put receive levels for ADSL2 at 5000 metres well down into the noise (-50 to -60dbm). Even for ADSL you would need real good copper cable for it to work at 5000 metres.
Yes at about 4km (cable) from the exchange, I get far too many dropouts on DSL. Here is a 4G test at my home, with the modem/router sitting outside with an extension lead for power: http://www.speedtest.net/my-result/3553122571 It's by far the best speed I have seen here, but I've only got 10GB of data without fixed IP and all data up and down is counted. You can't get those speeds with a 3.5G mobile phone, nor that low latency. According to the Optus maps, I'm not supposed to be able to get 4GPlus here -- one of my friends has seen 80Mb/s from his 4GPlus mobile when visiting Springvale, but he is on a proper business plan and that /may/ translate to higher speeds having greater priority. Cheers A.