In reply to a post by tommy45:

In reply to a post by jez9999:

Already talked to Zen; they say that from their POV the PPP connection is stable. They also say that things are considered stable until you get up to about 5 dropouts a day because "VDSL is an imperfect technology".

I would say that as many as 5 drops in PPPOE or PPPOA sessions within say 7days isn't within normal limits, I wouldn't want or expect 5 within any month, So many drops would have a significant impact on any connection, IMO

agree shocking standards, but I guess when reading zen's t&c's one may understand why, its clear zen are not an isp to fight openreach on faults and so this sort of policy then isnt too surpising. I believe tho the defenition of broadband isnt just speed it also has to be "always on", 4 drops a day to me falls foul of that but thats just my opinion.

The Openreach implementation of VDSL2 does not currently include SRA. SIN 498 does point out to the SP that their PPP timeout needs to take care of the fact that a re-sync can take as little as 20 seconds. Many SPs seem to ignore that and therefore fail to drop and re-establish PPP.

Edit - SIN number had the "9" missing .

Edited by RobertoS (Sat 23-Nov-13 00:51:10)

SRA is incompatible with how BTw operates, the fact they trying to make it a requirement to have low ppp timeouts.

From a end user standpoint its preferable for PPP to stay connected, it preserves the ip and reduces the impact of an outage, but from BT's standpoint it breaks their ip profile system which they insist on keeping.

Interesting as well is some peep's on 330mbit FTTP reporting lower ip profiles O_o down to just over 200mbit.

In reply to a post by RobertoS:

The Openreach implementation of VDSL2 does not currently include SRA. SIN 48 does point out to the SP that their PPP timeout needs to take care of the fact that a re-sync can take as little as 20 seconds. Many SPs seem to ignore that and therefore fail to drop and re-establish PPP.

Shame no SRA - and its interesting that Openreach's biggest SP doesn't get this right either, assuming the PPP timeout is set at the RAS end.

In reply to a post by Chrysalis:

SRA is incompatible with how BTw operates, the fact they trying to make it a requirement to have low ppp timeouts.

SIN 498 specification for non-Openreach modems:-

"R.VDSL2.9 The modem shall support seamless rate adaptation (SRA) as defined in Section 13.1 of G.993.2 [3]."

So it seems Openreach are looking into it.

Edited by RobertoS (Sat 23-Nov-13 00:57:27)

In reply to a post by jez9999:

I'd like to hear from people who are getting VDSL2 through BT's FTTC offering (whether with BT or some other ISP). How common are PPP disconnections for you? The output of pppd on my Linux box (being used as my router, directly connected to the Openreach VDSL modem) shows that I am getting somewhat regular, though intermittent disconnections.

I've not noticed any issues and I check my TBBQM fairly frequently. With a static IP address I wouldn't notice a short disconnect unless one happened while I was using the network. I've not heard of anyone else seeing frequent reconnects so I suspect the fault lies with your equipment.

Edited by Andrue (Sat 23-Nov-13 11:42:33)

In reply to a post by RobertoS:

In reply to a post by Chrysalis:

SRA is incompatible with how BTw operates, the fact they trying to make it a requirement to have low ppp timeouts.

SIN 498 specification for non-Openreach modems:-

"R.VDSL2.9 The modem shall support seamless rate adaptation (SRA) as defined in Section 13.1 of G.993.2 [3]."

So it seems Openreach are looking into it.

and sra is defaulted to enabled on the new hg612 firmware.

But it still remains incompatible with existing IP profile mechanisms.

In reply to a post by Chrysalis:

Interesting as well is some peep's on 330mbit FTTP reporting lower ip profiles O_o down to just over 200mbit.

Are they paying for 330Mb or are they on 160Mb Infinity 3?

All those I saw on the BT forum are on 160Mb Infinity 3. The speed that the IP Profile is set at would approximately match the expected speed from the new 220Mb/20Mb Openreach product.

These guys were likely provisioned on 330Mb/20Mb as that was all that was available and will be moved to 220Mb/20Mb when the Openreach contract is up.

In reply to a post by Chrysalis:

and sra is defaulted to enabled on the new hg612 firmware.

Where does that come from?

In reply to a post by Chrysalis:

and sra is defaulted to enabled on the new hg612 firmware.

But it still remains incompatible with existing IP profile mechanisms.

It doesn't need to be compatible. SRA's job is to keep a line active by rate adapting downwards in event of lower than tolerable SNR hence the modem won't go above the IP profile'd level.

As you may remember from UKOnline with SRA the only way is down.