Re: Small Download Speed Upgrade
 

are most ares 750 or 1ghz?

Re: Small Download Speed Upgrade
 

That's why I said that it requires VM's infrastructure to be improved so as to support the QAM increase.

Re: Small Download Speed Upgrade
 

Little point in a QAM increase. With the advent of DOCSIS 3 more economical to just use additional channels.

Re: Small Download Speed Upgrade
 

I agree with seph, whilst it may be more economical to use more channels, but its clear VM dont want to use more channels, for whatever reasons they see fit. You have told us there is free space for extra channels with the analogue turn off so the question is where are these channels?

I think you previously answered for downstream there is a licensing issue so cannot use 8 channels yet but many areas dont even have 5 channels yet and also many areas only have 2 upstream channels instead of 3 or 4 or 5 or whatever is needed to prevent congestion.

Re: Small Download Speed Upgrade
 

At least Igni is consistent by saying SNR is a stumbling block. (See here).

But as I see it, if 1024QAM requires 38-41 dB SNR and if most of the SH's are reporting this downstream SNR value, it may be worth trialling this because modems will also acquire at 256QAM.

Re: Small Download Speed Upgrade
 

No they won't, any modems that can't handle 1024QAM will error and/or fall offline, there is no spectrum management and no ability to downrate downstreams to accommodate modems with marginal SNRs.

VM could work around this by periodically probing modems for their downstream SNR however where do you draw the line as far as the amount of customers you allow to have a marginal or non-existent service and think of the OSS expense?

Compare this to investing in higher density line cards when you are going to be swapping some line cards out due to upstream bonding requirements anyway - no brainer.

The acid test for this really is a simple one - how many operators are running 1024QAM, and how many have supplied additional capacity simply by using 8 x 256QAM downstream compatible CPE and filling the downstream channels?

Is there a pressing need for more than 400Mbps to a single service group right now? When there is a need for more than this 16 downstream silicon both on line cards and modems is waiting.

Re: Small Download Speed Upgrade
 

That's a wicked ping you have there!

I had to wait until Santa brought me my new TP-Link Router before I could test out my upgrade, seems to be working just fine using Superhub in modem mode.

https://www.cableforum.co.uk/images/...012/01/103.png

The superhub is using 4 downstream channels and 1 upstream channel, but my area does seem to be (thankfully) free of torrent freaks.

Re: Small Download Speed Upgrade
 

Don't be jealous - I've improved yours for you...

Re: Small Download Speed Upgrade
 

Ahem....

Re: Small Download Speed Upgrade
 

The speed tester's ping reporting is unreliable, ignore it. On the gaming machine I have the ping time is 5ms, on this laptop it's 40ms+, both have the same latency on traceroutes.

Pinging gonzales.namesco.net [85.233.160.167] with 32 bytes of data:
Reply from 85.233.160.167: bytes=32 time=28ms TTL=52
Reply from 85.233.160.167: bytes=32 time=16ms TTL=52
Reply from 85.233.160.167: bytes=32 time=16ms TTL=52
Reply from 85.233.160.167: bytes=32 time=16ms TTL=52

Ping statistics for 85.233.160.167:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 16ms, Maximum = 28ms, Average = 19ms

https://www.cableforum.co.uk/images/...012/01/101.png

Re: Small Download Speed Upgrade
 

I disagree there. Statistical contention again, here thinking of the user's own connection. A single person is unlikely to use 200mb on their own for any significant length of time - the oft-quoted most webservers only have 100mb for example. Usage goes up but nowhere near linearly - something like 20% higher usage when speed gets doubled in the last study I saw.

Assuming all the conditions are favourable, yes, but they would only do so for half the amount of time. Again, reducing statistical contention.

---------- Post added at 15:47 ---------- Previous post was at 15:41 ----------

I believe upgrading from 750 to 1Ghz was part of the 100mb rollout upgrades.

Re: Small Download Speed Upgrade
 

Nah, most areas are 750MHz or 860MHz. Overbuilding has been done on areas running at 550MHz, areas at 750MHz have only had work done where needed for upload upgrades and downstream laser changes to permit use of 256QAM in areas previously doing 64QAM.

Re: Small Download Speed Upgrade
 

I assumed was a tcp ping on the speedtest not a udp one which would then make it affected by tcp window sizes which are smaller on laptops which is what explanation I gave to myself why my laptop got lower ping times on it. However with your results my idea is out the window unless your laptop is tuned for large tcp window sizes or has a dodgy wireless signal.

---------- Post added at 17:56 ---------- Previous post was at 17:52 ----------

They dont need to use it for a significant amount of time. Even a 200mbit user doing a 10 second speedtest can cause 10 seconds of congestion. I am talking about burst rate demand, not overall usage. Incidently its not too diffilcult to exceed 100mbit assuming no congestion on VM side, various servers now use gigabit interfaces, p2p uses multiple sources meaning they can exceed 100mbit by collective means rather than a single fast connection, giganews and the like will very unlikely still be using 100mbit interfaces, eg. every ftp file server I run is at least a gigabit interface, a few are actually multi gigabit bonded as even a gigabit is considered small now days for file hosting. The only downloads that would struggle is http downloads as they usually single stream only with web server software often not using rfc1323.

---------- Post added at 18:00 ---------- Previous post was at 17:56 ----------

So those with the delayed uplift work for overbuilding are now in the best position with more useable bandwidth?

Re: Small Download Speed Upgrade
 

Why would window size affect a TCP ping?

Yep.

Re: Small Download Speed Upgrade
 

Not in my area.