My openreach modem has an atainable rate of over 100 mbps (when the modem is hacked). My SNR is over 26db in the modem

Which makes me think that the modems actually synced at 39998 kbps currently. Otherwise why would the SNR be so high?

The modem does report 'attainable rate.' It doesn't report the current sync speed anywhere which I assumed was what the router was detecting?

Either way how does the router know the connection speed etc?

In reply to a post by Cobra001:

yes the one provided by the ISP. Least sky router show the sync speed. No this must being sent to the ISP router some how as I agree it would not being doing it "natively". Guess the Openreach router broadcast it to the ISP router, therefore if we had an idea on how it could be intercepted

If that is the sync speed, and not the maximum for the product as Stanman suggests, (I have no idea which is correct), then it can only be coming from the Sky system somewhere. As I think you could be thinking yourself.

The Sky system gets told it by the kit in the cabinet, as per the BT document I quoted above. So it could send it back down as data for your router.

What is absolutely certain is that your Openrech modem that is plugged into your phone line is not supplying it to your router.

We will only know the truth of the matter when either somone gets it showing less than the maximum, or somone hacks the modem and gets different figures. People on 80/20 are the ones to look out for, as there are many on that on other ISPs getting lower than 80/20 sync's.

In reply to a post by ukhardy07:

The modem does report 'attainable rate.' It doesn't report the current sync speed anywhere which I assumed was what the router was detecting?

[cough]
What's this then?

# xdslcmd info --stats
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 2
Max:    Upstream rate = 15624 Kbps, Downstream rate = 59328 Kbps
Path:   0, Upstream rate = 1999 Kbps, Downstream rate = 39997 Kbps

Link Power State:       L0
Mode:                   VDSL2 Annex B
VDSL2 Profile:          Profile 17a
TPS-TC:                 PTM Mode
Trellis:                U:ON /D:ON
Line Status:            No Defect
Training Status:        Showtime
                Down            Up
SNR (dB):        14.3            20.5
Attn(dB):        0.0             0.0
Pwr(dBm):        12.6            0.4

The line below the "Max" line is the sync speeds.

In reply to a post by kasg:

If you get your IP profile from the BT speed tester (diagnostic version), your downstream sync speed can be obtained by multiplying the IP profile by 1.033 and the upstream sync will be the same as the reported maximum. I suggest disconnecting and reconnecting your session (or rebooting your router) before doing this to ensure that the IP profile has been updated.

Just realised.

I wouldn't expect the BT speed test to run on Cobra's connection. Sky are supposed to be taking a GEA feed, not WBC. Not only should the test not work, there probably is no IP Profile either, as per Sky ADSL2+.

Edited by RobertoS (Mon 07-May-12 01:37:43)

I will look at my openreach modems sync statistics and see if they are identical to the sky router info

I find it interesting.

Also can you explain why the Internet only works with the router plugged in? If I plug my pc directly into the router and unplug the sky router I can't get online.

If the connections all made in the modem surely I wouldn't need the sky router

Does the router authenticate somehow?

EDIT: this is the case with modem both locked and unlocked & via both ports 1 and 2

Edited by ukhardy07 (Mon 07-May-12 01:44:10)

Yes no profile as such on sky & ofc speed tester does not work

I just feel that sky's doing something quite different to BT

Edited by ukhardy07 (Mon 07-May-12 01:40:29)

They are doing things different to BT Wholesale, yes. But the modem and GEA are the same. Period.

With 100Mbps attainable and 26dB noise margin, you will be on maximum sync for the product, so sync's will probably be the same as the router is showing. It's people on greater distances from the cabinet where it will show.

Presumably when by-passing the router, you are putting the login details into your computer's network connection system? The modem only sync's with the exchange. It does not authenticate with the ISP. But I have no knowledge of this MER system, whether that affects logging in using on-computer settings.

Edited by RobertoS (Mon 07-May-12 01:51:46)

I'm tempted to unfilter my setup and introduce lots of noise on the line... That would lower the sync.
After all there's no profile / DLM for me to worry about.

Really interested in this

Also no. I was simply plugging in. I understand now. I thought wrongly that the modem also had the login details etc.

Based on this if I got my own router that supported MER I could theoretically use my own router without using sky's what so ever.

Always learning!

There most certainly is DLM, remember the cabinet and link back to the exchange are run by Openreach, and that section - which includes your line, over which DLM operates - will be exactly the same as with a BT WBC service. There is no IP profile, but DLM will still interleave and/or cap your line if you screw around with it too much.

Yes, you could use your own router (as long as it supports MER, which is as of yet uncommon, but anything that runs Openwrt should do it). Windows doesn't do MER, which is why plugging it straight into your computer won't work (easily). It is possible, but only with some heavy modifications.

Edited by deleted (Mon 07-May-12 03:14:10)

I have a friend in sky who has categorically told me that DLM has been turned off on my line. Not sure I believe him 1000% though!

I'll leave things alone for the time being. Perhaps somebody can shed some light on the situation who is on 80/20 sky £30 product.