What do you mean by "the ISP router"?

Do you mean one you have that they have supplied, or one on their internal network?

Basically no "router" knows anything about sync speed. Only modem/routers such as an ADSL2+ router or a VDSL2 router do, because they have a built-in modem.

The one you connect to the OR modem doesn't. That's the problem . Only the modem knows it.

The other place that the sync speed (and some other info) is known is at the cabinet (DSLAM?), I'm sure that this info is available to BT (Openreach/Wholesale) and (indirectly) the ISP.

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.

Not true on the upstream sync.

Upstream IP profile appears to always be just the limit for the service you're on and bears no relation to sync speed.

Not true on the upstream sync.

Upstream IP profile appears to always be just the limit for the service you're on and bears no relation to sync speed.

Thanks, I don't think I've ever had a connection that didn't sync at the maximum possible upstream, so I would not have noticed.

Edited by kasg (Sun 06-May-12 15:59:48)

In reply to a post by Al1264:

The other place that the sync speed (and some other info) is known is at the cabinet (DSLAM?), I'm sure that this info is available to BT (Openreach/Wholesale) and (indirectly) the ISP.

You misread my reply to Cobra. I started with a question, remember?

In any case, my post was carefully worded. It is indeed known at the cabinet, by the modem there handling the line. This appears to get back into the BT Wholesale DLM, as I have explained elsewhere, to enable calculation of the WBC IP Profile.

Routers do not "pick up " the sync.

Absolutely agree RobertoS,
I was not arguing or picking holes in your post, just adding information.
A router (without modem) has no information about sync or any other DSL stats but those who have no access to their own modem line stats can, in certain circumstances, obtain some of this information via their ISP.

Seems i misunderstood your post . Anyway:-

The upstream and downstream VDSL data rate is reported to the CP BRAS/Radius upon PPP discovery (a similar mechanism exists for DHCP ¡V see section 2.1.7). The VDSL rate states the rate at which Ethernet traffic can be transmitted on the link. This traffic comprises of:
- A 4 byte per frame overhead added by Openreach for internal routing
- A degree of overhead introduced by DSL (Packet Transfer Mode layer),
- The EU traffic sent from the CP, or from the EU.

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

I thought I should add my two pence.

The sky router is definitely picking up some statistics somehow. It knows the sync up and down and it also detects if the modem drops connection as the WAN on the statistcs resets to 0 like ordinary ADSL...

Just to backup what Cobra001 has been saying here are the details that the sky router picks up.

http://imageshack.us/photo/my-images/444/skyrouter1....
http://imageshack.us/photo/my-images/151/skyrouter2....

I think the homehub does things differently.

Also with the sky connection. If you connect to the modem directly via ethernet and bypass the modem the internet does not work. You can only get connection by using the sky router. This forces MER also. Which also means using your own router on sky is a no no unless you plug it into the sky router ie MODEM - SKY ROUTER - OWN ROUTER.

Those values aren't the sync speeds of the openreach Modem.

Those are the limits of the connection the sky router has with the Openreach modem., i.e. the profile you have. In your case a 40/2 profile.

True sync speeds would show the maximum that the router would be capable of.

See bottom of page for an example.

http://beusergroup.co.uk/technotes/index.php?title=D...

Edited by TheManStan (Mon 07-May-12 00:52:20)