Docsis1.0 or docsis1.1?

[Tony.]

I am on the 20 meg BB and was under the impression i would be put onto DOCSIS1.1 however checking my modem I am on DOCSIS 1.0

Thu Aug 13 12:57:13 2009 Thu Aug 13 12:57:13 2009 Information (7) We registered with a DOCSIS 1.0 config file!

I do seem to have a reasonabley reliable service ;) was just wondering wether this could be improved by being on DOCSIS1.1? :confused:

[Ben B]

I get a reasonably reliable service on 20mb and i'm on Docsis 1.0 as well. The only problem with mine is my downstream power level is at -11 dBmV which means my download speed can degrade at times but a tech is coming on Tuesday to sort that.

[Traduk]

I am on 20Meg and also on DOCSIS 1.0.

I saw it change at around 01.00 one morning when the service I was using showed a cut-off and the file sent by VM was DOCSIS 1.1 and I was on with the 50Meg users. The IP changed and routing was via what I know to be the 50Meg network.

5 days later it all fell apart and files were sent with several changes back and forth between the new and old network. The result for me was several chats with Indian support to get my dial-up speeds fixed and in the end the totally messed up modem had to be changed by an engineer.

Turning a 6 month old 255 into a near brick appears to have frustrated the supposed blanket change for 20Meg users because I guess that too many modems got ruined.

I am happier to stay where I am rather than go through another couple of weeks of frustration.

Yes. The newer connections were better and held max speeds at all times but it wasn't worth the hassle to VM or me as a customer. Perhaps they will find a way of upgrading the files without creating paper weights at some point in time.

[Mick Fisher]

My modem event log makes no mention of registering any kind of config file. I just get the following sequence over and over again. BB is working OK :shrug:

Sun Aug 16 11:59:30 2009 Sun Aug 16 11:59:30 2009 Information (7)Downstream sync ok
Sun Aug 16 11:59:30 2009 Sun Aug 16 11:59:30 2009 Critical (3)SYNC Timing Synchronization failure - Loss of Sync
Sun Aug 16 11:59:30 2009 Sun Aug 16 11:59:30 2009 Information (7)Downstream sync failed
Sun Aug 16 11:59:30 2009 Sun Aug 16 11:59:30 2009 Information (7)Downstream sync ok
Sun Aug 16 11:59:30 2009 Sun Aug 16 11:59:30 2009 Information (7)locked and synced to rescue CMTS...all is well!
Sun Aug 16 11:59:30 2009 Sun Aug 16 11:59:30 2009 Information (7)Downstream sync ok
Sun Aug 16 11:59:30 2009 Sun Aug 16 11:59:30 2009 Critical (3)SYNC Timing Synchronization failure - Loss of Sync
Sun Aug 16 11:59:30 2009 Sun Aug 16 11:59:30 2009 Information (7)Downstream sync failed
Sun Aug 16 11:59:30 2009 Sun Aug 16 11:59:30 2009 Information (7)Downstream sync ok
Sun Aug 16 11:59:30 2009 Sun Aug 16 11:59:30 2009 Information (7)locked and synced to rescue CMTS...all is well!

[Welshchris]

Mick im getting that on mine BUT! my modem is rebooting and its due to a fluctuating Upstream Power Level hitting as high as 59dbmv. After almost 3-4 weeks of this and Second line support knowing of it i had to threaten the ISPA if they didnt sort it and now they said a tech would be here on Tuesday between 4-7pm. im on Docsis 1.1.

[alexcopeland]

Mon Aug 17 03:59:08 2009 Mon Aug 17 03:59:08 2009 Information (7) We registered with a DOCSIS 1.1 config file!

What does this now mean for me if anything at all?

[Badders]

I think it means you've been moved onto the new kit :) Have you a different IP address?

[*sloman*]

I'm in Derby and on a 1.1 config file on my 20Mb (50mb 22nd Aug)

[Kymmy]

The DNS should change as well the virginmedia.com for those on 1.1

I believe that once an area is upgraded to 50Mb and fully working then they take the decision to move the 20Mb people to 1.1 So even if your area is now 50Mb enabled you might not yet be on 1.1

[Traduk]

My modem event log makes no mention of registering any kind of config file. I just get the following sequence over and over again. BB is working OK :shrug:

Sun Aug 16 11:59:30 2009 Sun Aug 16 11:59:30 2009 Information (7)Downstream sync ok
Sun Aug 16 11:59:30 2009 Sun Aug 16 11:59:30 2009 Critical (3)SYNC Timing Synchronization failure - Loss of Sync
Sun Aug 16 11:59:30 2009 Sun Aug 16 11:59:30 2009 Information (7)Downstream sync failed
Sun Aug 16 11:59:30 2009 Sun Aug 16 11:59:30 2009 Information (7)Downstream sync ok
Sun Aug 16 11:59:30 2009 Sun Aug 16 11:59:30 2009 Information (7)locked and synced to rescue CMTS...all is well!
Sun Aug 16 11:59:30 2009 Sun Aug 16 11:59:30 2009 Information (7)Downstream sync ok
Sun Aug 16 11:59:30 2009 Sun Aug 16 11:59:30 2009 Critical (3)SYNC Timing Synchronization failure - Loss of Sync
Sun Aug 16 11:59:30 2009 Sun Aug 16 11:59:30 2009 Information (7)Downstream sync failed
Sun Aug 16 11:59:30 2009 Sun Aug 16 11:59:30 2009 Information (7)Downstream sync ok
Sun Aug 16 11:59:30 2009 Sun Aug 16 11:59:30 2009 Information (7)locked and synced to rescue CMTS...all is well!

That is the same sequence of entries that I saw in my file log after the fourth attempt at flip\flopping between 1.0 and 1.1. Whether it was coincidental but the appearance of those entries also heralded the steady daily speed decline to way less than 1Meg. My modem file was corrupted and the "rescue" entry had never been seen, by me, before or since.

My power levels had been fairly steady and well within parameters for months but upstream was higher whilst on 1.1 and bordering on the problem area of 55+. It is back and steady at 45dBmV since the modem change and the resumption of the 1.0 connection.

Re-booting the modem whether by hard reset (power off\on) or at the behest of the Indian CS (three times) appeared to make matters rapidly worse and hastened failure.

[Mick Fisher]

Hmmm..my upstream is 53.3 ATM :( but has been as high as 57.

BB still appears to be working as normal though.

[Griffin]

My modem has been registered with a 1.1 config file since 31/7/09 all other settings power etc seem to be the same as config 1.0. My speeds are still rock solid at an average 19.32Mb/s on speedtest.net & downloading service packs & beta iso's from microsoft gives a steady 2.2mb/s speed

[Badders]

The DNS should change as well the virginmedia.com for those on 1.1

Mine haven't. They're still 194.168.4.100, 194.168.8.100. I'm on 20Mb though (if that makes a difference).

[Traduk]

Hmmm..my upstream is 53.3 ATM :( but has been as high as 57.

BB still appears to be working as normal though.

Although the BB appears to be working properly the logs are showing synch failures. It could well be that it recovers so quickly as to be virtually unnoticeable.

Each modem type has differing tolerances and my memory of upstream 55+ as problematic dates back to SB100 and that was 4 modems ago:(.

The difficulty with third party interpretation of what might be wrong is cause and consequence. My 255 displayed events such as yours during the flip\flop between 1.0 and 1.1 as the upstream showed higher levels. It doesn't follow that modems will end up with corrupted files but that was the end result of VM's attempts to migrate my connection.

[Mick Fisher]

For the moment I will cross my fingers and hope for the best.

[indie1982]

Mine haven't. They're still 194.168.4.100, 194.168.8.100. I'm on 20Mb though (if that makes a difference).

Not the DNS servers that you use but the reverse DNS of your IP address would change to *.virginmedia.net from *.ntl.com

[Badders]

ok then - it has changed to virginmedia.net.

[caph]

I posted this in my thread a week ago. It's probably worth adding to this thread too.

It transpires that what actually happened was that as a 20Mb customer I was moved to a spanking new 50Mb UBR last month as expected and was registering with DOCSIS1.1.

After the 50Mb upgrade was completed I was promptly moved back to an old DOCSIS1 UBR.

It has taken just short of a fortnight of persistent complaints to 2nd level tech support and from what I've gathered a lot of ticket ping pong between network and support before I was moved back. It also seemed to require 2nd level support stressing that this request was backed by the CEO's office before any notice was taken.

Maybe I'm just unlucky but it seems to me like the promise of 20Mb customers being moved to 50Mb infrastructure was a lie and that 20Mb customers are being left on old UBRs unless they kick up a stink and have intervention from the CEOs office.

Any 20Mb customers out there on 50Mb enabled hubsites still registering with DOCSIS1 in the modem event log? It might be worth a check if you are still receiving poor speeds in the evening.

We SHOULD all have been transferred to 50Mb units, that was definitely the intention and I was told this by the CEO's office. I'm very dubious that this is being carried out and this thread seems to reinforce my opinion.

Your upstream power level will jump up by a few db if you are moved. I believe Broadbandings has an idea about why this is.

[Ignitionnet]

Your upstream power level will jump up by a few db if you are moved. I believe Broadbandings has an idea about why this is.

It's to improve upstream SNR / signal quality. There's extra attenuation on some of the upstream ports which causes modems to transmit at a higher power level.

[Welshchris]

broadbandings it didnt improve mine it made it worse....

Where when i was on the Docsis 1 network my upstream was 45 - 49 dbmv when it switched to docsis 1.1 my upstream was getting as high as 59 dbmv and causing my modem to reboot almost on a daily basis.

An engineer came out on tuesday and said it was the modem and i argued saying NO! and he was like well i cant do anything but he changed the modem and since then i am now back on the docsis 1 network, i enquired why and told im on some sort of overspil UBR for 20mb customers. my upstream is now back to around 47dbmv most of the time and no modem reboots since.

[Ignitionnet]

Ah note I said it's to improve signal quality by increasing transmit power, in your case increasing it a tad too much.

I would be hesitant about trusting anything the tech says about 'overspill' etc given that his first immediate response was to try and blame your modem for the issue.

Anyway so long as all is working.

[Welshchris]

the tech didnt say anything about overspill it was Virgin themselves as i enquired why i went back to DOCSIS 1 when i was told that ALL the 20mb users supposed to have been switched to DOCSIS 3 platform in swansea.

[Ignitionnet]

the tech didnt say anything about overspill it was Virgin themselves as i enquired why i went back to DOCSIS 1 when i was told that ALL the 20mb users supposed to have been switched to DOCSIS 3 platform in swansea.

Maybe they were switched back due to problems with return path / upstream transmit power to the new kit being too high? ;)

Some areas the migration hasn't happened at all, and technical support on the phones aren't going to be aware of why migrations haven't happened nor reasons for a migration back unless they've a specific bulletin. Doubtful it's capacity though given the relatively minor impact of the STM'd 20s relative to the leeching like hell 50s.