Cable Forum - 100M Tech Guy did it perfect

Cable Forum (https://www.cableforum.uk/board/index.php)

- Virgin Media Internet Service (https://www.cableforum.uk/board/forumdisplay.php?f=12)

- - 100M : Tech Guy did it perfect (https://www.cableforum.uk/board/showthread.php?t=33677464)

Re: Tech Guy did it perfect

I know everyone will sigh at me for ignoring the no feeding signs but according to the 'Finally Arrives Here' thread you started on 13 March:

Quote:

Originally Posted by telfordcable (Post 35193128)

I got 100 Meg finally arrive here today and here is my wifi wireless speed......

Then after a couple of days of endless speed/ping tests on 15 March:

Quote:

Originally Posted by telfordcable (Post 35193336)

just downgrade back to XL 30 meg now as I don't like 100 meg at all. speed is all over the place, 25, 42, 52, 61, 77, 83 and 96 meg and very poor upload speed with poor ping.

Then 20 minutes later you backed it up with:

Quote:

Originally Posted by telfordcable (Post 35193342)

I now realise myself that both L 10 Meg and XL 30 Meg is more solid and far better than rubbish XXL 50 Meg and 100 Meg (very poor indeed and not worth the money!) I shall not go ahead with 200 Meg in a few years time. I am now staying with XL 30 Meg forever! :)

Early hours of the next day (16 March - keep up eveyone!!):

Quote:

Originally Posted by telfordcable (Post 35193669)

100Meg isn't worth it to be honest, waste of Â£45 a month for silly low speed!

Later that same day:

Quote:

Originally Posted by telfordcable (Post 35193803)

Just upgrade back to 100 Meg as tech guy had fixed my power level. It now stable 98.79Meg download and 9.42Meg upload. Downloading transfer rate of 10.2Mb/s solid. Ping is now 6ms. Much better :)

On the 17 March after we had all discussed how much all these changes must be costing you, it looked like you were going to stick it out on your new tier:

Quote:

Originally Posted by telfordcable (Post 35194250)

Look folk, it real as my ebilling is in credit of -Â£103.00 as I owe virgin media zero bill this month and the activation fee is free of charge upgrade to 100Meg from 30Meg. No charge as they credit me Â£30.00 for activation fee. 100 Meg no problem here so far! Got 4ms ping and 0ms jitter!

13:17 - 18 March, after we've all debated at length if you are for real or not the news we've all been expecting:

Quote:

Originally Posted by telfordcable (Post 35194979)

Revert back to 30 Meg today

22 March:

Quote:

Originally Posted by telfordcable (Post 35197819)

I am now on large 10 meg just downgrade from XL 30 meg to L 10 meg now!

I don't need 30Meg, I don't need 50Meg, I don't need 100Meg and I don't need 200Meg in future. I only surf the internet, forum, chat and email and that's was it.

25 March:

Quote:

Originally Posted by telfordcable (Post 35199439)

I am now back to 50 Meg XXL with VMNG300! Activated today.

19:29 7 May:

Quote:

Originally Posted by telfordcable (Post 35231240)

I would like to say many thanks to virgin media tech guy who came to my house today to installed 100 Meg, XL TV with Sky Sports & Movies with HD, and XL phone with unlimited calls. All went very well. I gave him a nice cup of tea and a cake. The tech guy had replaced a new superhub and fitted a new HD v+ box in three rooms!

19:40 7 May:

Quote:

Originally Posted by telfordcable (Post 35231246)

It will staying with 100 Meg for the next 18 months with new 18 months contract with everything, TV, Phone and Broadband all top packages!

@Telford, I was going to do a graph of your speed changes, but thought it might give me a funny turn. Can't you see from the above why nobody can take anything you say seriously?

If you manage to go for 18 months without changing to a different package I could be tempted to pay your 19th months broadband for you, not that I think for a minute I'll be getting my cheque book out!!

Cheers
Grim

Re: Tech Guy did it perfect

Care to respond to my request telford?

Re: Tech Guy did it perfect

Quote:

Originally Posted by GrimUpNorth (Post 35231866)

I know everyone will sigh at me for ignoring the no feeding signs but according to the 'Finally Arrives Here' thread you started on 13 March:

Then after a couple of days of endless speed/ping tests on 15 March:

Then 20 minutes later you backed it up with:

Early hours of the next day (16 March - keep up eveyone!!):

Later that same day:

On the 17 March after we had all discussed how much all these changes must be costing you, it looked like you were going to stick it out on your new tier:

13:17 - 18 March, after we've all debated at length if you are for real or not the news we've all been expecting:

22 March:

25 March:

19:29 7 May:

19:40 7 May:

@Telford, I was going to do a graph of your speed changes, but thought it might give me a funny turn. Can't you see from the above why nobody can take anything you say seriously?

If you manage to go for 18 months without changing to a different package I could be tempted to pay your 19th months broadband for you, not that I think for a minute I'll be getting my cheque book out!!

Cheers
Grim

That poster will post every now and then with a complete load of bull excreta that Walter Mitty would have not made up. He knows that the admins here cannot touch him because he stays just this side of the line. Everyone should do what i have done and put the fool on ignore

Re: Tech Guy did it perfect

Quote:

Originally Posted by Sirius (Post 35231894)

Admin's perogative no? If he is that much of a disruption even keeping in toe with the rules, then I am sure they can use discretion and just ban him :P

Re: Tech Guy did it perfect

I'm confused as to how anyone can manage to upgrade and downgrade in such a short space of time .Each new package would require a new contract surely ?

Re: Tech Guy did it perfect

Quote:

Originally Posted by Ignitionnet (Post 35231839)

Cable is shared. ATDMA manages a shared resource reasonably efficiently.

I could explain more but I don't have the inclination given the rest of your post.

I know about ATDMA, I have explained it myself on the VM forums how it works etc. So no need to explain.

I still think its a pile of rubbish myself, there is other ways.

Oh and btw ATDMA is a modulation type. Overall I would prefer SCDMA over ATDMA.

EDIT: I remember me and pip having a discussion about this, but pip just opened up a new thread and didn't bother to respond :P

Re: Tech Guy did it perfect

Quote:

Originally Posted by DABhand (Post 35231921)

so this here.

http://www.cableforum.co.uk/board/35230501-post2.html

VM are not actually using scdma on docsis2 then? sounds like a mode that would help latency. It does seem VM are barely utilising docsis2, no qam64 and no scdma.

Re: Tech Guy did it perfect

Quote:

Originally Posted by martyh (Post 35231919)

I'm confused as to how anyone can manage to upgrade and downgrade in such a short space of time .Each new package would require a new contract surely ?

I would find it shocking if it was true ;)

Re: Tech Guy did it perfect

Quote:

Originally Posted by Chrysalis (Post 35231928)

so this here.

http://www.cableforum.co.uk/board/35230501-post2.html

VM are not actually using scdma on docsis2 then? sound slike a mode that would help latency. It does seem VM are barely utilising docsis2, no qam64 and no scdma.

SCDMA has other benefits, it can utilize 128QAM with TCM (Trellis Coded Modulation). Also the fact that there is not time slots assigned per modem on the upstream, so modems can transmit Asynchronous, but as some people know ATDMA is not Asynchronous and assigns time slots to each modem on the same node so it is not a continuous data transmition.

Re: Tech Guy did it perfect

Quote:

Originally Posted by Chrysalis (Post 35231928)

so this here.

http://www.cableforum.co.uk/board/35230501-post2.html

VM are not actually using scdma on docsis2 then? sound slike a mode that would help latency. It does seem VM are barely utilising docsis2, no qam64 and no scdma.

Quote:

ATDMA is a direct evolution of DOCSIS 1.x physical layer (PHY), which uses TDMA multiplexing. DOCSIS 1.x upstream PHY uses a frequency division multiple access (FDMA)/TDMA burst multiplexing technique. FDMA accommodates simultaneous operation of multiple radio frequency (RF) channels on different frequencies. TDMA allows multiple cable modems to share the same individual RF channel, because it allocates each cable modem its own time slot in which to transmit. TDMA is carried over in DOCSIS 2.0, with numerous enhancements. SCDMA is a different approach, in which up to 128 symbols are transmitted simultaneously via 128 orthogonal codes. SCDMA multiplexing allows multiple modems to transmit in the same time slot. Both ATDMA and SCDMA provide the same maximum data throughput, although one might perform better than the other under specific operating conditions.

and

In order to get high throughput with SCDMA, the modems must all be time aligned within a fraction of the symbol rate. Otherwise, the â€œSâ€ (synchronous) part of CDMA fails, and the data from one modem corrupts the data from other modems. The result is packet loss. The timing resolution is measured in nanoseconds. There are issues when you measure things in nanoseconds across a distance of 40 km (a short network) or up to 320 km (a long network):

minute changes in fiber path distance, caused by temperature (expansion and contraction of the glass itself)

expansion of the coaxial network (which is why every span has an expansion loop)

the fact that the speed of light also changes with temperature, in both fiber and coaxial line (Velocity of Propagation as a percentage of speed of light)

Every 1 second, an SCDMA modem must be time-aligned, if the modem is more than 20 km from the headend, even if less than half of that network is overhead plant. This represents at least 60 to 80 percent of the cable modems for most multiple service operators (MSOs).

If the hybrid fiber-coaxial (HFC) network is 100 percent underground (including the fiber), the modems are less than 10 km from the headend, and the temperature is very constant for a given day. Then the modems can be time-aligned less often.

Apparently, timing alignment had become a major problem with the modems of some vendors in general. They lose synchronization with the downstream and do not realize it, and then transmit at the wrong time. Therefore, the modem transmits at a time that is reserved for another modem and causes packet loss both for itself and for the other modem. The packet loss for all modems vanishes when only the bad modems are removed from the network.

source

Re: Tech Guy did it perfect

Cmon Pip put it into your own words surely you got taught that at school :)

What it doesn't say even though it is the same max throughput, ATDMA due to its time sloted upstream channels can cause packet loss when sending data packets to a destination, etc.

Again SCDMA is superior, in the fact as said it can handle 128QAM and use TCM. And Asynchronous upstream channels, even to us it is unnoticeable for the ATDMA timeslots but to the modem etc it is eternity :P

Re: Tech Guy did it perfect

Quote:

Originally Posted by Maggy J (Post 35231955)

Topic?

is there one ?

Re: Tech Guy did it perfect

I saw Telford posting modem stats, and assumed that 100mb uses ATDMA upstream, so said... but it seems to have turned into a debate. Which is more entertaining than Telford.

Re: Tech Guy did it perfect

Quote:

Originally Posted by DABhand (Post 35231960)

I saw Telford posting modem stats, and assumed that 100mb uses ATDMA upstream, so said... but it seems to have turned into a debate. Which is more entertaining than Telford.

Then open a thread about it..But keep to topic in this thread.