DMT vs CAP Encoding / DSL Upgrade Downside? 9
cmark asks: "I recently 'upgraded' my Qwest DSL from 640/272 to 640/640 to increase the bandwidth of my Counter-Strike server. When I got this upgrade, Qwest sent me new a new router (a Cisco 678 to replace my Cisco 675) and changed the encoding from CAP to DMT. In this process I do not have greater bandwidth and thus less lag on the server but I have increased latentcy (higher pings). My ISP says that it is the encoding, something about the interlacing that they cannot explain. Qwest says that it is not the encoding but must be some routing that my ISP is doing. What is causing the increased latentcy and what can I do about it?"
"A traceroute looks normal to me... If I was hosting a website or using it for some other business purposes I probably would not care but in gaming a low ping is crucial, I have lost the regular players that I had and the server sits empty most times all the while costing me more money! Qwest also says that I cannot go back to CAP even if I downgraded, since they are migrating off of CAP."
interleave (Score:2, Informative)
This mechanism de creases the error bitrate from 1 in 10^3 down to 1 10^6
However, it increaese delays due to the interleaving.
ALSO the TCP/IP will take care of the retransmissions in case of a problem. Ping times can be as high as 160mS one way and as low as 20mS with interleaving turned of.
Re:interleave (Score:2)
meanmachine is right, the bit error rate isn't critical for you. the latency is.
the solution, for you, luckily, is nearby. the cisco line of dsl routers has changable interleaving settings! all the info i can find now is at dslreports [dslreports.com].
if this doesn't work, then the solution is to get your provider to turn off interleaving. this will be difficult. repeat: this will be difficult. you'll probably have to beg, beg some more, beg to 20 different people, and then they still won't do it. ask to talk to a dsl tech, supervisor, whatvever. but if your cisco can't do it, then getting them to change it at the far end is the only way.
good luck.
i'll try to post more if i can find it.
complex
Re:interleave (Score:2)
complex
That is: 160mS with interleave 20mS without it (Score:1)
DMT has advantages, disadvantages (Score:2)
DMT spreads the signal differently, and thus has less crosstalk. It is thus the "standard". It doesn't always perform as well and is more latent though.
ADSL or SDSL (Score:1)
read http://www.dslreports.com to stay up to date
Re:ADSL or SDSL (Score:1)
More info and thanks (Score:1)
I am not hopeful though, everything else I have asked of them has been no or yes but then they screw it up so why should this be any different.
Qwest sucks! (Score:1)
The tech did not know what I was talking about but, said they would look into it.
Then came the responses.
First they said they did not understand the request but that there is not problem with my line (duh!)
Then after I re-explained it, they told me that all such requests must come from my ISP (vector internet services inc. in this case. Qwest supplies the line, VISI the IP etc.) So I called VISI who has already told me that they have been though this before and that Qwest will not budge. They reiterated that Qwest is not going to do it and would not even reattempt the request because they had been through it so many times. I then called qwest back and asked why they sent me on a goose chase in the first place knowing that they do not fullfill such requests.
The customer service rep said that she would take it to the third tier support (developers as we all know), they denied all knowledge that it was even possible.
When I countered that Cisco (who made the DSLAM) had informed me that it was possible and offered to bring them in on a three way call, the rep refused and said that they must not have bought in on that 'option' from Cisco.
I guess I wil give up and find some other way to get my CS server on the internet. poo poo on qwest they should allow this kind of flexibility to their customers! Must be that old monopoly mentality.