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 DJPremium
join:2001-06-13
Columbus, GA
 ·Knology
| reply to no1ukn0w
Re: Full Node? Let's see, I've read several questions of interest. Let's see if I can answer them to your satisfaction!
From your profile, it appears you're on a small regional ISP. If so, then there is the possibility that the network is overcrowded and is beyond the ISP's financial means to expand/improve service across the board. I don't know the financial health of your ISP, so there's a chance that I'm wrong.
From what I've read--thoroughly!--I believe it's an overcrowded network, not your node in particular. At times you may be experiencing a congested node, or an overcrowded network. You won't know which is the cause unless you run some tests.
"No one is complaining in your area." BULL CRAP! That is what they're trained to say. If you notice the repair trucks in your area a lot, then there's your answer. If they admit there's a problem, then they'd be required to fix it.
If you're too far away from the node, then your speeds could suffer from signal loss. That's very unlikely, though. Note that you get the same amount of allotted bandwidth if you live right by the node or on the end of the line. Distance from the node HAS NO EFFECT on bandwidth priority. Everyone gets the same slice of the pie.
There is no "good" number of users per node so to say. Every ISP has configured their network to handle so many people per node. It is up to the ISP to properly manage their network and add/split nodes when the user base grows too large and speeds begin to suffer. This costs a lot of money, and many smaller ISPs are hesitant to do so.
A DS3 connection provides speeds up to 45Mbps. For 1000 users, it would be easy to saturate that connection. If 11% of the user base download at 384k during peak time, the DS3 would be at maximum capacity. Any more users, and speeds begin to plummet.
If it's true that the upstream is burstable, than that could be the root of the problem concerning packet loss. Having a saturated upstream is far worse than having a slowed downstream path. If the upstream is clogged, then packets sent by the user will have a hard time getting to the backbone. Some packets will squeeze through, others will get lost and your downstream speed will suffer as a result. So if there's a bunch of P2P kids sharing files at 1500k, it's inevitable that everyone will experience poor performance.
Ask if your cable network is based on the DOCSIS protocal. It doesn't sound like it is, since a modem's upload isn't burstable on a DOCSIS compliant system. A DOCSIS modem will only give you speeds UP TO the given cap--on rare occasions you may see speeds slightly above the caps.
When you're experiencing packet loss, run a line quality test here on DSLReports. It'll reveal where the packet loss begins and hopefully ends. Please be patient when trying to run the test. Often times you'll get a "busy signal" so you'll need to keep refreshing the page until you're given a slot. Post your results here and we'll help you find the root of the problem. Good luck! | |
 no1ukn0wWhats This?
join:2002-01-24
Boerne, TX | Thumbs up !
thanks for the help.. I have run some tests here are some links.
»/quality/nil/713249
Yes very small isp, actually only serves on my guess about 1000 people. I am almost positive that it is a DOCSIS network.. we are using sb4200 modems.. and I am pretty sure they told me that if I provided my own modem it must be DOCSIS compliant. I am starting to get very concerned though, I am constantly getting 700+ uploads!!! I know most that read this will say.. thats a good thing.. but not with the amount of PL that comes with it.
2002-03-29 13:41:07 Speed test (la) 240/745 kbps
2002-03-27 11:04:24 Speed test (la) 338/767 kbps
2002-03-20 21:44:36 Speed test (la) 236/747 kbps
2002-03-20 20:59:43 Speed test (la) 245/1139 kbps
but remember the cap is 384/128.. is it possible that the cap isnt working at all? I have used a program (forgot the name, its dos based) that showed me that the caps ARE there and they are set at that. Does anyone know how caps actually work?
As of the past week speeds have been fine, really never get below 200/700. Although sometimes it looks like this:
2002-03-25 23:23:09 Speed test (la) 35/3 kbps
In this case I really need the quailty over the speed, I get so much pl sometimes that my uploads/downloads time out. And of course online gaming is impossible, which really makes me mad 
Should I try to request being put on a different node? How hard is it to get put on or split a node? What about the caps, how is that possible?
Thanks again for the reply dkaley | | |
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| reply to DJ
In your cable systems headend they may combine several nodes to go to one internet server port. Thus the number of customers on YOUR node may have no bearing on the load the server port your ultimately plugged into has. This depends on their design. I would be surprised at the costs of equipment that they have 1 node per 1 internet return port. Also, if they do not maintain some form of balance of customers per port on the server, server speed can be effected, i.e. 200 on one port but only 38 on another. As per your node in the field, they used to figure that up to 500 homes and all their traffic demands, ie. TV, internet, IPPV, telemnetry such as alarms etc., could be served by one node. The problem is that the bandwidth ability of the node in the field isn't the same as the bandwidth abiility of the internet equipment. Your time frame does suggest it's bandwidth but you could have plenty of bandwidth but have users who've modified their modem caps to use more than their fair share at your expense. Your provider should be able to monitor this and cancel those abusive users. | |
| reply to DJ
A 1000 users on a DS3 is WAY below what any ISP is over-subscribing a connection at today. The standard is 4000 users on a DS3 unless there is no cap. 4000 dsl users on a DS3 is easy, cable would be lower than that due to the higher speeds of the end users for the most part. I had 2800 DSL users on a DS3, all were SDSL or IDSL, lots at 1.5 x 1.5 and the DS3 never peaked over 18 megs. Where is the packet loss occuring? Between you and the gateway, or beyond. | |
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