Going from ADSL to ADSL2+

FrenchTart · 9 Apr 2012 at 18:13

If those attenuation figures are right you should get the full 24mbit, though your downstream noise margin is somewhat low and is likely to be a limiting factor in your final speed.

3dcandy · 9 Apr 2012 at 18:19

yeah, and as said before that's adsl not adsl2. Should be much, much better on adsl2+

FrenchTart · 9 Apr 2012 at 18:28

3dcandy said:
yeah, and as said before that's adsl not adsl2. Should be much, much better on adsl2+

Yeah...it's obviously adsl1 with that sync speed

It's also normal for attenuation to rise considerably with the move to adsl2+ frequencies. Even with that increase I would expect the line to be capable of maximum sync though. The noise margin is concerning however - Tute, are you plugged into the master socket and/or do you have any phone extensions?

mikeo · 9 Apr 2012 at 18:28

Looks like the noise margin and the attenuation are being displayed the wrong way round to me!
IE. hard to believe an RX attenuation of 5db! You'd need to be living in the exchange!!

Even so, if your rx attn is 17dB, you should still get a very good sync indeed.

FrenchTart · 9 Apr 2012 at 18:30

mikeo said:
Looks like the noise margin and the attenuation are being displayed the wrong way round to me!
IE. hard to believe an RX attenuation of 5db! You'd need to be living in the exchange!!

Even so, if your rx attn is 17dB, you should still get a very good sync indeed.

Ah yeah... That makes sense completely actually.

3dcandy · 9 Apr 2012 at 18:33

perhaps he does live in the exchange, we're quick to judge

mikeo · 9 Apr 2012 at 18:35

3dcandy said:
perhaps he does live in the exchange, we're quick to judge

mikeo · 9 Apr 2012 at 18:36

http://www.kitz.co.uk/adsl/max_speed_calc.php

Indicates around 21Mbps.... most would kill for a sync like that over copper!

Tealc · 9 Apr 2012 at 19:31

5 is even lower than mine (8dB) but I wonder what'll happen to it when it goes ADSL2+. I'm about 200 M as crow flies from my exchange. I sync at 21Mbit with Sky LLU.

mikeo · 9 Apr 2012 at 21:30

Tealc said:
5 is even lower than mine (8dB) but I wonder what'll happen to it when it goes ADSL2+. I'm about 200 M as crow flies from my exchange. I sync at 21Mbit with Sky LLU.

If your rx attn is being reported correctly (assuming this is the value you had when on ADSL max) then I would have expected you to sync at the full 24Mbps! Though I'm the first to admit that it's not an exact science!!

I'd be interested to know how far Tute is from his exchange (go on... nip over to http://www.samknows.com/broadband/exchange_mapping). Though my money is still on that his "DSL status" display showing the attenuation and SNRM the wrong way round (IE. his rx attn is really 17dB).

Tute · 10 Apr 2012 at 00:58

Exchange is about 100m away. I can see it from my bedroom window!

3dcandy · 10 Apr 2012 at 08:30

in ye olde BT days when up to 8 meg became available I lived in the building next to the exchange. I had to ring up with a small problem, guy asked me what's your sync speed...8192...no what's your real sync speed..8192...**** me was his answer....

Tute · 10 Apr 2012 at 08:46

So yeah, about 100m from the exchange. Street cabinet is just across the road from my front door, probably about 10-15m from the master socket?

This is the setup I use at the master socket:

The socket was put in fresh when we moved here, then it passes through an ADSLNation filter, and a 0.5m RJ11 cable to the modem. The modem then passes it onto the Airport Extreme. The blue cable is the CAT5 that runs off upstairs to my PC, everything else runs wirelessly on the 5GHz channel.

There are no other extensions connected to that socket, it's just the phone and modem.

mikeo · 10 Apr 2012 at 13:38

Tute ... only 100m... you lucky so and so.

If that's the case, then maybe your rx attn is really 5dB. Moving to ADSL2+ will raise it around 3/4 dB but even so, looks like you could be in for a maxed out connection. Envious I am.

Not long to wait now.

Tute · 10 Apr 2012 at 14:00

Well it doesn't totally max out the 8MBit connection, I do get upwards of 7MBit though so i'm expecting 20MBit+ from the upgrade.

Nightglow · 10 Apr 2012 at 14:06

When I had ADSL & ADSL 2+, I found that using XTE-2005 filtered faceplate, gave me a extra 1mb increase over using a filtered dongle.

Whether it was down to it being better components, or using a direct extension, instead of a trailing lead I don't know.

FrenchTart · 10 Apr 2012 at 14:06

Tute said:
Well it doesn't totally max out the 8MBit connection, I do get upwards of 7MBit though so i'm expecting 20MBit+ from the upgrade.

Your adsl1 sync speed is maxed out. You get overheads and line profiles/etc that eat into the speed but with a bit of luck you'll be sync'd at the full adsl2+ speed, even if you end up getting lower throughput than the headline figure sounds like.

Tute · 10 Apr 2012 at 14:09

Ahhh I see.

Tute · 10 Apr 2012 at 14:32

This is the current profile - I think the slower speed is the BT site as with something like the Zen test files I can hit 900kb/s.

mikeo · 10 Apr 2012 at 14:37

FrenchTart said:
Your adsl1 sync speed is maxed out. You get overheads and line profiles/etc that eat into the speed but with a bit of luck you'll be sync'd at the full adsl2+ speed, even if you end up getting lower throughput than the headline figure sounds like.

Indeed it is.

With ADSL2+ you should see approx. throughput of 88% of your sync speed. As there are no fixed IP profiles like with ADSL max.