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Bandwidthitus, I am cured.

N/A

Bandwidthitus, I am cured.

Like many people here I have recently started getting stressed about the up and down performance of my adsl line. I even started doing these speedtests and stuff and was diagnosed with Bandwidthitus by my GP.
he said "this can become a serious problem, some people never shake it off. They just will not accept the adsl specifications and limitations"

later,I sat down and thought: Well, if just 4 of the 50 people sharing my line were downloading at the same time as me, we would each have 128k and if 8 were, we would get 64k each and so the maths goes on.
the likelyhood of having 8 of your 50 online and downloading as much as they can is very high indeed as many people (like me) have adsl for p2p apps and leave there pcs switched on a lot.

I knew full well when i signed up for adsl that it was contended 50:1 so of course the speed will sometimes be brilliant , sometimes dreadfull. Plusnet never said you will get 10 x faster they said UP TO 10 x faster as you will be sharing the line with up to 50 people.

Also, some people who have it really good at the moment, will be slowing down, as perhaps there are only 38 - sharing there line at the moment, and as Plusnet add more users, taking it up to the 50, they will think the service is degrading.


So I am cured, for the time being and shall go back to enjoying my sometimes fast, sometimes slow PC.
:rollsmile:
5 REPLIES
Saturn
Grafter
Posts: 732
Registered: 30-07-2007

RE: Bandwidthitus, I am cured.

But that's not how it works. The 50:1 contention relates to a 10Mb/s interconnection between your local exchange and the internet spine. Therefore, your worst case performance will be 200kb/s. If you're getting less than 200kb/s there's something wrong.
jlpappin
Grafter
Posts: 95
Registered: 12-09-2007

RE: Bandwidthitus, I am cured.

Agreed. People areunder this assumption it is 512k shared but it isn't. If it were, do you think I would swap my 56k for something that could potentially end up at 10k?
N/A

RE: Bandwidthitus, I am cured.

> Agreed. People areunder this assumption it is 512k shared but it isn't. If it were, do you think I would swap my 56k for something that could potentially end up at 10k?

You have, as Judy is correct! See http://www.adslguide.org.uk/howitworks/contention.asp.

Tim


N/A

RE: Bandwidthitus, I am cured.

If we all were there with p2p all day then adsl would not work. If you are thre with your p2p all day you can for now exploit the adsl service to th malefit of fellow customers. It would seem unwise to anticipate that you will be able to continue to use the adsl service in this inequitous manner. Sometime - and soon - the isps will have to deal with the hogs. We dont know how they will deal the hogs yet but it will have to happen.

> Like many people here I have recently started getting stressed about the up and down performance of my adsl line. I even started doing these speedtests and stuff and was diagnosed with Bandwidthitus by my GP.
> he said "this can become a serious problem, some people never shake it off. They just will not accept the adsl specifications and limitations"
>
> later,I sat down and thought: Well, if just 4 of the 50 people sharing my line were downloading at the same time as me, we would each have 128k and if 8 were, we would get 64k each and so the maths goes on.
> the likelyhood of having 8 of your 50 online and downloading as much as they can is very high indeed as many people (like me) have adsl for p2p apps and leave there pcs switched on a lot.
>
> I knew full well when i signed up for adsl that it was contended 50:1 so of course the speed will sometimes be brilliant , sometimes dreadfull. Plusnet never said you will get 10 x faster they said UP TO 10 x faster as you will be sharing the line with up to 50 people.
>
> Also, some people who have it really good at the moment, will be slowing down, as perhaps there are only 38 - sharing there line at the moment, and as Plusnet add more users, taking it up to the 50, they will think the service is degrading.
>
>
> So I am cured, for the time being and shall go back to enjoying my sometimes fast, sometimes slow PC.
> :rollsmile:

N/A

RE: Bandwidthitus, I am cured.

Contention ratio applies to a chunk of OC3 in exchange. Usually 155Mbps pipe is divided into 10Mbps chunks. Each 10Mbps chunk of pipe can support 20 home users @ their maximum 512kbps. Contention Ratio of 50:1 means that BT can put up to 50 times as many users (50x20 = 1000) on one chunk of the pipe, whatever that might be. Should such black scenario ever take place it would mean that each of the 1000 users using the same chunk would have approx 10kbps of bandwidth for themselves and enjoy very much plusnet like download speed of approx 1.20kB/s.

Contention ratio of 1:50, as invented per BT was initially feared and believed to be a joke or miscalculation. Later, the theory was born that each ATM would be load balanced, to prevent some chunk being permanently clogged and others almost empty. Would make sense - if you think about it - what is the likelihood of 15,500 users in the same area, on the same 155Mbit ATM using Internet at the same time? Probably as high as being hit by lightening in urban area. However, if you think about it, penny counting ISP could, in theory squeeze many users from many exchanges on the same outgoing pipe, in which case, it would take only 3000 users sharing one 155Mbit pipe for them to experience awfulness of 5kB/s downloads. That's possible, right? Well, take a look at this:

Let’s download something from my web space at plus.net
RETR test.file
150 Opening BINARY mode data connection for test.file (1544043 bytes).
226 Transfer complete.
Transferred: test.file 1.47 MB in 28.67 (52.59 KBps)
Transfer queue completed
Transferred 1 file totalling 1.47 MB in 28.97 (52.59 KBps)

And same file from ftp.demon.net
RETR test.fie
150 Opening BINARY mode data connection for test.file (1544043 bytes).
226 Transfer complete.
Transferred: test.file 1.47 MB in 57.92 (26.03 KBps)
Transfer queue completed
Transferred 1 file totalling 1.47 MB in 58.09 (26.03 KBps)

Right, so it’s not the exchange that’s clogged, it’s not the BT that has a problem. Simply, somewhere between sms.core.telehouse.plus.net [212.159.1.106] and jalpiaza.core.telehouse.plus.net [212.159.1.226] my side of the plus.net realm is served with Internet via overloaded, throttled or capped line.

As for Mr. Clarkes pretension to “peer to peer hogs” as he called them… well, I think we’ve been waiting in this country for a long time to receive uncapped, 24/7 internet. And frankly – I don’t care what people use it for. I don’t use P2P, couldn’t name more than two programs if asked. I do a lot of downloads via ftp. Back and forward. Long chunks, small chunks. And I know at least half a dozen people that transfer minimum of 500Mb a day for living. I work with them. That’s why wise people invented internet. That’s why wise people invented ADSL. Warez kiddies, Kazaa leeches, don’t vent on them – their usage is not any different from what would happen if people actually watched movies via IP like they do in US, music on demand, listened to the radio on multiple computers al day long, played games, downloaded 100Mb service packs for their windows. ADSL is for 24/7. ADSL is for bandwidth hogs. Not for Sunday surfers. Not for “once a week porn enthusiasts”. It is a home solution for all those leeches hungry of whatever Internet has to offer. It’s that simple. And if some ISP can’t provide the service, if it’s not profitable enough for them to serve all these leeches than they should ask themselves if they target the right part of the money market then. Perhaps business users exclusively would be a better choice. Nah, we all know they can sue if they don’t get their service.
I can bet that one binary news server, and one unregistered storage server of a 300Gb+ type on the “unsecured” part of the ISPs network is a bigger bandwidth hog that any Kazaa kids all together… Just that those usually don’t appear in usage logs either. J