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| Thread ID: 108494 | 2010-03-31 04:20:00 | My Actrix connection | Nomad (952) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 871287 | 2010-03-31 04:53:00 | Yes you can. I was thinking of a Firefox "add on" feature so it is on the bottom of my screen ... | Nomad (952) | ||
| 871288 | 2010-03-31 05:02:00 | yeah that is one good thing about xnet. | nedkelly (9059) | ||
| 871289 | 2010-03-31 05:14:00 | To access your Actrix broadband usage graphs go to www.actrix.co.nz Login to the My Actrix box with your username and password and from the links on the left select Cyberjet usage. |
Safari (3993) | ||
| 871290 | 2010-03-31 05:32:00 | when you have a FLS/128 plan ISPs all limit the speed to 4-5 mbps. Something to do with TCP/IP.The short answer: The ISP isn't limiting it - it's caused by the way the TCP protocol works, and the limit on the upload speed. If you use any protocol other than TCP, this limit isn't an issue. The long answer: For every TCP packet received, your computer needs to send an ACK packet which acknowledges the receipt of whatever packet you just got. If this isn't sent, then the sending machine will send the packet again... and again... and again - which obviously is very useful if you have a bad connection that drops packets, but somewhat useless if you've already got the data! The reason this behavior results in a max ~4.5Mb/sec downstream speed over TCP is because even though ACK packets are small, they do still use up some bandwidth - and because they're going from your computer to the remote one, that's your upstream bandwidth. ~4.5Mbits/sec is about the point where the ACK packets for all that data you're downloading are enough to saturate your 128Kb/sec upload - you can't acknowledge receiving anything faster than 4.5Mbits/sec, so that is the real-world limit on your connection speed. If you increase your upload bandwidth, this becomes less of a problem - and at higher rates goes away altogether, because the upload bandwidth available is now sufficient to acknowledge enough packets to saturate the downstream link and still have some upstream capacity left over. Does Actrix have a usage monitor utility? Why is it some ISPs now say FS is up to 4.5Mbit, but a few yrs ago, Telecom were advertising 7Mbit?While Telecom's 7Mb/sec figure is technically correct, the design of the TCP protocol results in slower speeds. As TCP is the protocol that people use for the overwhelming majority of their data needs, it makes more sense (and is less misleading) to advertise the TCP performance your connection is capable of, rather than simply advertising the max raw data rates. Telecom's figure also assumes you're rather close to the exchange. The 4.5Mb/sec figure allows a lot more leeway distance-wise. |
Erayd (23) | ||
| 871291 | 2010-03-31 05:54:00 | yeah I thought it was not the ISP which is why I edited my post and inserted that quote | nedkelly (9059) | ||
| 871292 | 2010-03-31 10:51:00 | But this can be overcome by adjusting the TCP receive window size. In XP it requires something like TCP Optimiser but in Vista and Win 7, I believe it is dynamic. en.wikipedia.org |
decibel (11645) | ||
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