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[jelv]

That probably rules out AAISP who would do the bonding. I wondered if their rental for line only with no calls for £12 a month might get them in the price range.

[Jakg]

Still waiting for my 2700HGV to arrive, so in the meantime another question.

Stats at 5db SNR:

http://i.imgur.com/2EC11qP.png

Stats at 4db SNR:

http://i.imgur.com/sORslLx.png

Speed is better at 4 - but it looks like I've got interleaving on and my line is still getting much more errors (but no disconnects). How do I balance speed vs errors? I think my line would be stable at 3db - but if that means a higher sync speed, more errors but overall less throughput it's pointless.

[burakkucat]

You need to consider the lowest value to which the DS SNRM drops per 24 hour cycle. Then your "tweak value" is defined by the following --

DS SNRM_min - DS SNRM_tweak = 3 dB  (1)

Rearranging (1) --

DS SNRM_tweak = DS SNRM_min - 3 dB  (2)

By making use of equation (2) you ensure that there is 3 dB "headroom" and, hopefully, the CRCs and ESs do not dominate the connection.

[Jakg]

Another update

Bought a 2Wire 2700HGV (well two with one PSU).

I got a faster connection (1050kbps) but the router appears to lose connection after several hours. The log suggests its going to reconnect, but it doesn't actually seem to do so automatically. I reconnect it, it works for a while - then dies.

Watching the stats it seems to be very aggressive at trying to drop my SNR so I suspect that it's just too aggressive for the line? Confused why it can't reconnect though. I've tried 2 units, both with different firmware versions. Same PSU with both, though.

Back on the Billion 8800NL and getting 800kbps.

Both were using ADSL (G DMT). Will try using ADSL2 later.

I forgot to mention - my DSLAM is Infineon. I've seen online that supposedly your better matching vendors. My Billion is broadcom but the 2Wire used an Infineon chip. Any other good Infineon ones?

[burakkucat]

   Hmm . . . Infineon is owned by Lantiq and Lantiq is now part of Intel.

I'm not sure which devices have an Infineon chip-set. 

[Jakg]

  Hmm . . . Infineon is owned by Lantiq and Lantiq is now part of Intel.

I'm not sure which devices have an Infineon chip-set. 

best I could come up with is DrayTek - 2820n router or 120 modem (£20 on eBay)

[GigabitEthernet]

I always found Broadcom chipset routers to work best with Infineon DSLAMs/MSANs.

Although, most of the newer TalkTalk routers use Infineon chipsets, I believe.

[GigabitEthernet]

best I could come up with is DrayTek - 2820n router or 120 modem (£20 on eBay)

Now that I am on an FTTC connection, I have a stack of ADSL modems/routers that are now useless, one of these being a Draytek 120. Perhaps you would like it for a small cost?

[ejs]

I think the 2Wire 2700HGV is not Infineon / Lantiq based.

There's a table of various TI, Infineon then Lantiq models here: http://wiki.openwrt.org/doc/hardware/soc/soc.lantiq

I think a lot of the difference between CPE chipsets is trading speed for stability. My ancient AR7 based netgear DG834G v3 tends to connect at a higher line rate than a Technicolor 582n and TP-Link TD-W8970, but the old AR7 does so with higher error rates, which makes it more likely for the DLM to take action resulting in a lower speed. I'm connected to TSTC exchange equipment.

[Jakg]

Just to add that I cannot get a connection the exchange using ADSL2 (not ADSL2+). It's G.DMT or nothing.

[ejs]

It may be what I said before - your ISP has provisioned your line as ADSL1 only, in that case you'd have to get them to change it. It's also possible the line is just too long to get a connection on ADSL2, whereas ADSL1 just barely manages to work.

Plusnet's usual reasoning for provisioning under 4Mb speed estimate lines as ADSL1 is that ADSL2+ might be worse on such long lines. Of course that's true, it might be worse, but it's just as true as saying ADSL1 might be worse than ADSL2. You won't know which is better or worse until you try them.

[Jakg]

It may be what I said before - your ISP has provisioned your line as ADSL1 only, in that case you'd have to get them to change it. It's also possible the line is just too long to get a connection on ADSL2, whereas ADSL1 just barely manages to work.

Plusnet's usual reasoning for provisioning under 4Mb speed estimate lines as ADSL1 is that ADSL2+ might be worse on such long lines. Of course that's true, it might be worse, but it's just as true as saying ADSL1 might be worse than ADSL2. You won't know which is better or worse until you try them.

i think getting such an explanation out of BT is unlikely!

[burakkucat]

I wonder if it might be possible for our special agent, Black Sheep, to look up your exchange details?

Perhaps the exchange equipment has not been upgraded from the original G.Dmt-only kit . . .

[Jakg]

I wonder if it might be possible for our special agent, Black Sheep, to look up your exchange details?

Perhaps the exchange equipment has not been upgraded from the original G.Dmt-only kit . . .

My exchange is fairly up-to-date - theres FTTC available, for example (just not to me!)

[burakkucat]

My exchange is fairly up-to-date - theres FTTC available, for example (just not to me!)

There can be a VDSL2 service (FTTC) available but the exchange based ADSL equipment can still be G.Dmt only. Why? Because the cabinets are fed from a fibre head-end that is located in a "more major" exchange.