Ender, you do understand that there are potentially many modems attached to 1 cmts?!?
The issue is contention ratio, and unless someone from Telstra wants to say otherwise, Glassman admitted that by international standards we have loaded the nodes way over what is normally regarded as acceptable levels.
1 fast ethernet "is a bottleneck" if several people are online sucking from the same teet at the same time. Replace the cmts with a gigabit connection and the bottleneck is opened up significantly. Split the node into 2 or 4 and you also ease the bottleneck.
Quidam, perhaps you should try and explain to everyone how it's possible to flatline a 100mbps ethernet with 42mbps (The theoretical, no you will never actually get this in user throughput, limit of a docsis 2.0 downstream) of traffic?
Ender, you do understand that there are potentially many modems attached to 1 cmts?!?
The issue is contention ratio, and unless someone from Telstra wants to say otherwise, Glassman admitted that by international standards we have loaded the nodes way over what is normally regarded as acceptable levels.
1 fast ethernet "is a bottleneck" if several people are online sucking from the same teet at the same time. Replace the cmts with a gigabit connection and the bottleneck is opened up significantly. Split the node into 2 or 4 and you also ease the bottleneck.
Quidam, perhaps you should try and explain to everyone how it's possible to flatline a 100mbps ethernet with 42mbps (The theoretical, no you will never actually get this in user throughput, limit of a docsis 2.0 downstream) of traffic?
Obviously Cyril has already cleared up my confusion on this issue, and the issue of oversubscription on the cmts remains valid. But thanks for being so abnoxious. You work for Telstra right?
ps. Here's an interesting link from cisco about recommended max users per cmts:
cyril7: Good stuff, you say Wellington, does that include Kapiti.
Cyril
Does anyone know?
Sorry but I have been following this with interest as I am struggling to stay in a game of WoW or EQ2 for more then 10 - 15 mins at peak times up on the Kapiti coast and according to the people at TLC HD that I have been talking to "There are no issues on your node".
cyril7: Good stuff, you say Wellington, does that include Kapiti.
Cyril
Does anyone know?
Sorry but I have been following this with interest as I am struggling to stay in a game of WoW or EQ2 for more then 10 - 15 mins at peak times up on the Kapiti coast and according to the people at TLC HD that I have been talking to "There are no issues on your node".
Go easy on a first timer... :-)
Swede
This is indeed sad of a major telco. I suggest you call Telstra sales guys for an answer. They were the ones who finally told me what was going on after 7 months, as well as this thread of course.
As a matter if interest, what leads you to believe TCL's network falls outside of these engineering guidelines?
As a matter of interest, what leads you to believe that I am lead to believe TCL's network falls outside of these engineering guidelines?
:D Nice.
Previous comments you've made such as the following does:
Quidam: The issue is contention ratio, and unless someone from Telstra wants to say otherwise, Glassman admitted that by international standards we have loaded the nodes way over what is normally regarded as acceptable levels.
Also, I wouldn't read too much into what Glassman said. That post contains only some very general info about the cable network.
As a matter if interest, what leads you to believe TCL's network falls outside of these engineering guidelines?
As a matter of interest, what leads you to believe that I am lead to believe TCL's network falls outside of these engineering guidelines?
:D Nice.
Previous comments you've made such as the following does:
Quidam: The issue is contention ratio, and unless someone from Telstra wants to say otherwise, Glassman admitted that by international standards we have loaded the nodes way over what is normally regarded as acceptable levels.
Also, I wouldn't read too much into what Glassman said. That post contains only some very general info about the cable network.
Well, the numerous technicians that have visited my house since before Xmas all say that the problem is network congestion thats causing me disconects during peak hours.
Quidam: As a matter of interest, what leads you to believe that I am lead to believe TCL's network falls outside of these engineering guidelines?
I think Dopp might be reacting to your previous comment :
Obviously Cyril has already cleared up my confusion on this issue, and the issue of oversubscription on the cmts remains valid.
Firstly, I appologise for contesting your original assertion based on my lack of understanding with regards cmts throughput. This is a big learning curve for me.
Secondly, have you not read the post by glassman?!? It's not like I came up with the idea myself. In fact it's very hard for me to believe Dopp was even being serious (or sincere) with his question.
If in fact Dopp knows there are no overloading issues on the nodes, then why doesn't he just come out and say that? (effectively calling Glassman either a liar or misinformed)
Lastly, I am representing myself as a consumer looking to understand why my connection has been so unreliable for the last few months. Clearly I'm not the only one experiencing issues. Exactly who is Dopp?!? Assuming he works for Telstra (even if by contract) it would probably do a lot to help perspective and context if he stated what his actual role is.
In fact it seems there are number of people appearing on this forum with perhaps just one or two posts, without indicating their involvement or interest.
"There is no way to Peace -Peace is the Way" (A. J. Muste)
Secondly, have you not read the post by glassman?!? It's not like I came up with the idea myself. In fact it's very hard for me to believe Dopp was even being serious (or sincere) with his question.
If in fact Dopp knows there are no overloading issues on the nodes, then why doesn't he just come out and say that? (effectively calling Glassman either a liar or misinformed)
I'm walking a fairly fine line between what I'm allowed to tell people about how cable works, so I apologise if things seem a little obtuse.
I think alot of the confusion about the whole contention ratios comes from Glassmans comments about the TCL node size in Wellington and that there's one cmts per node... Which would be an issue if TCL had 100% penetration... Just because a node has 2000 homes in it (and I'm neither confirming nor denying that, call it a number for a theoretical discussion :P ) it doesn't mean all of those houses have cable.
Does that help at all?
Quidam: Lastly, I am representing myself as a consumer looking to understand why my connection has been so unreliable for the last few months. Clearly I'm not the only one experiencing issues. Exactly who is Dopp?!? Assuming he works for Telstra (even if by contract) it would probably do a lot to help perspective and context if he stated what his actual role is.
In fact it seems there are number of people appearing on this forum with perhaps just one or two posts, without indicating their involvement or interest.
Yes, I work for TelstraClear. I'm one of the IP Geeks (not an official title :) ), we work on all sorts of kit amongst which is the cable network.
Although I can't be 100% sure why your specific connection may be having issues there are some well known problems TCL are working to resolve, the ARP issue being the biggest one. That particular issue, and the reason for this thread, is very close to being resolved.
In fact the Christchurch mass migration was completed Monday morning and Arp levels there are around 2-3pps at the moment, which is allllll good. And more importantly easily verifiable from anyone in chch with a cable connection and the know how to use wireshark.
We're currently analyzing data from the Chch migration and hope to roll out the solution to Wlg in the next couple weeks.
doppleganger: I'm walking a fairly fine line between what I'm allowed to tell people about how cable works, so I apologise if things seem a little obtuse.
I think alot of the confusion about the whole contention ratios comes from Glassmans comments about the TCL node size in Wellington and that there's one cmts per node... Which would be an issue if TCL had 100% penetration... Just because a node has 2000 homes in it (and I'm neither confirming nor denying that, call it a number for a theoretical discussion :P ) it doesn't mean all of those houses have cable.
Does that help at all?
Sure, I can fully appreciate the difference between potential and actual.
Since we have no facts or numbers, I'm going to take a stab that some nodes do suffer congestion in places where Telstra actually has achieved high market penetration -which annectdotally speaking, is not that hard to believe. Your product could almost be described as a monopoly, compared to the sort of performance offered by adsl in New Zealand.
Yes, I work for TelstraClear. I'm one of the IP Geeks (not an official title :) ), we work on all sorts of kit amongst which is the cable network.
Although I can't be 100% sure why your specific connection may be having issues there are some well known problems TCL are working to resolve, the ARP issue being the biggest one. That particular issue, and the reason for this thread, is very close to being resolved.
In fact the Christchurch mass migration was completed Monday morning and Arp levels there are around 2-3pps at the moment, which is allllll good. And more importantly easily verifiable from anyone in chch with a cable connection and the know how to use wireshark.
We're currently analyzing data from the Chch migration and hope to roll out the solution to Wlg in the next couple weeks.
Thankyou for the clarrification, and I guess we should be grateful to have someone like you posting on the forum at all (not withstanding your lack of bedside manner). Furthermore, I'm not intending to vent my frustration with Telstra's customer service directly onto you, but for the record, I've been wholy unimpressed with the run-around I've been given. It took coming to this forum before I managed to squeeze a formal ackowledgement from the helpdesk regarding the ARP issue.
In my opinion, the helpdesk folk probably (until very recently) were explicity banned from revealing or acknowledging there was a problem with their network, instead getting customers to blame their routers; modems; cables etc.. anything to buy more time.
In my specific case, I "suspect" there is not a contention issue on the node where I live, and is more likely related specifically to the ARP issue, or something else. In the case of Matt, I do suspect Contention; with ARP being an aggrivating factor.
Anyway, thanks for your reply, and I'll hazzard a direct question.
If am pinging my default gateway, what sort of numbers would you call "good" or "normal"?
typically, I get below 20ms and when the system seems to be running optimally, I'm getting close to 10ms (and sometimes under)
There are times when the pings go all over the place, (eg spikes into the many hundreds;thousands or even a complete timeout)
What would you associate that with? ie. is this a manifestation of ARP flooding or something else (eg congestion)
But I'll understand if you feel you can't be specific or even answer the questions.
ps. the reson I'm interested in typical ping values is that I suspect I get better than average, based on where I live (close to seaview) but this may be a fallacy. From what I've read about cable, where you live has little bearing on performance -yet I know someone who lives in Kendallah who has said they do not get pings anywhere near as low as me.
"There is no way to Peace -Peace is the Way" (A. J. Muste)
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