Kitz ADSL Broadband Information
adsl spacer  
Support this site
Home Broadband ISPs Tech Routers Wiki Forum
 
     
   Compare ISP   Rate your ISP
   Glossary   Glossary
 
Please login or register.

Login with username, password and session length
Advanced search  

News:

Author Topic: Which FTTC is best:- up to 40/10 sync or an actual 60/20 sync  (Read 5512 times)

les-70

  • Kitizen
  • ****
  • Posts: 1255

    It may be answered in another post but I am wondering (when eventually - if ever, my long delayed cabinet is enabled for FTTC) on opting for a 40/10 or 80/20 package.  I definitely don't want a 40/2 package as I upload a fair bit.

    I expect 80/20 will result in 60/20 actual sync on my line and, assuming all speed options are on the 17a profile, I am guessing that the 40/10 will most probably be fast path with a risk of interleaving on the 60/20. 

Apart from cost I suspect I may be happier with a 40/10 profile as there will be the added benefits of fast path and stopping me from being morbidly curious over the sync speed each day!  Does this view make sense? Is fast path fairly certain with up to 40/10 on 60/20 rated connection?  Would I really notice the extra speeds on a 60/20 sync, especially if it was interleaved?

 
« Last Edit: March 07, 2013, 03:04:01 PM by les-70 »
Logged

Black Sheep

  • Helpful
  • Addicted Kitizen
  • *
  • Posts: 5261
Re: Which FTTC is best actual 40/10 sync or actual 60/20 sync
« Reply #1 on: March 07, 2013, 10:58:56 AM »

Hi Les, how do you know what synch speed you will get ?? Do you live very close to the Cabinet ??
Logged

les-70

  • Kitizen
  • ****
  • Posts: 1255
Re: Which FTTC is best actual 40/10 sync or actual 60/20 sync
« Reply #2 on: March 07, 2013, 11:16:52 AM »

  I am about 500m from the cabinet but with lots of joints, BT estimates 66/20 but I think my attenuation may be a bit higher than they think.  A TDR show quite a few blips between me and the cabinet.  The performance is however not awful and not a fault as BT define one.  I wondered on whether you can pay to have line "cleaned up" but I suspect the cost might frighten me!
« Last Edit: March 07, 2013, 11:31:58 AM by les-70 »
Logged

NewtronStar

  • Kitizen
  • ****
  • Posts: 4850
Re: Which FTTC is best:- up to 40/10 sync or an actual 60/20 sync
« Reply #3 on: March 07, 2013, 06:58:33 PM »

If I look back at a certain table, 500 meters from Cab would put you on the 34-38 mbps Max Line sync -2 to 5mbps woud give 33Mbps Download and 6.5 mbps upload on the 40/10 service, unless you can see the FTTC estimated speeds,http://www.dslchecker.bt.com/adsl/adslchecker.welcome, then it's all up in the air at the moment until your cab is live with FTTC.
« Last Edit: March 07, 2013, 07:09:16 PM by NewtronStar »
Logged

les-70

  • Kitizen
  • ****
  • Posts: 1255
Re: Which FTTC is best:- up to 40/10 sync or an actual 60/20 sync
« Reply #4 on: March 08, 2013, 07:31:08 AM »

  The BT dslchecker estimates 66/20 on my line.  The minimum distance to the CAB is 440m and 500m is my estimate allowing for a few possible diversions from the ideal and some spare wire at junctions.

    Your reply does however question my assumption, i.e. if the estimator gives 66/20 then with a 40/10 profile I thought that I should sync at 40/10 with a good SNRM.  I am assuming and asking whether the 40/10 and 80/20 both run on the same vsdl2 profile. 
Logged

waltergmw

  • Content Team
  • Kitizen
  • *
  • Posts: 2774
Re: Which FTTC is best:- up to 40/10 sync or an actual 60/20 sync
« Reply #5 on: March 08, 2013, 07:54:41 AM »

Hi Les,

I believe all BT Wholesale VDSL services use profile 17A in VDSL2 Annex B mode.

If you have a service capable of a faster speed but running on the 40 / 10 service you will see a significant difference between the Max (Attainable) Rate and the actual (Path) rate.

Kind regards,
Walter

Logged

les-70

  • Kitizen
  • ****
  • Posts: 1255
Re: Which FTTC is best:- up to 40/10 sync or an actual 60/20 sync
« Reply #6 on: March 08, 2013, 09:53:51 AM »

  Thanks Walter that is helpful.

   I assume that I do then expect to have the choice of:-  1. a solid 40/10 sync with a good SNRM and most likely running fast path or  2. about 65/20 sync with a possibility of being interleaved.

   I am inclined to think that I won't really notice any difference most of the time between the two options?   However I have always sensed that fast path was more response -- but it is hard to say.    I may check how easy it is swap between products as I would not like to pay for 80/20 and then get e.g. 50/15 with interleaving.

   Do other have experience of the two options with both running on the 17A profile?

 
Logged

waltergmw

  • Content Team
  • Kitizen
  • *
  • Posts: 2774
Re: Which FTTC is best:- up to 40/10 sync or an actual 60/20 sync
« Reply #7 on: March 08, 2013, 01:05:32 PM »

Hi again Les,

Sadly we've found it can be a marathon to make any changes at all.
On your particular subject, I've managed to get a Zen service upgraded but only to find the cap had not been removed.
It required a SFI vist from BT Openreach before they would reset the cap (I.e. banded profile).

If you've got time to spare, you can read more of our sagas here:-

http://www.ewhurst-broadband.org.uk/?p=2283#comments

Kind regards,
Walter
Logged

les-70

  • Kitizen
  • ****
  • Posts: 1255
Re: Which FTTC is best:- up to 40/10 sync or an actual 60/20 sync
« Reply #8 on: March 08, 2013, 02:13:45 PM »

  Thanks for that Walter.  I will aim to make a once and for all choice of my options 1 or 2 above.  Does my view of how these two options work out for the end user sound correct?
Logged

waltergmw

  • Content Team
  • Kitizen
  • *
  • Posts: 2774
Re: Which FTTC is best:- up to 40/10 sync or an actual 60/20 sync
« Reply #9 on: March 08, 2013, 03:18:57 PM »

Hi Les,

It depends upon your expectations and your acceptance thereof. An estimate is just that. BS does many installations; he often says many achieve more than the estimate. Some I know in rural locations achieve less and others have remarkably accurate estimates. Note also that all estimates are based upon sync speeds which can differ from achieved throughput speeds. If you want certainty with only a little chance of disappointment, then go for the slower option.

Kind regards,
Walter
Logged

Paulxx

  • Just arrived
  • *
  • Posts: 1
Re: Which FTTC is best:- up to 40/10 sync or an actual 60/20 sync
« Reply #10 on: March 31, 2013, 08:20:17 PM »

Hi there,

I'm not quite clear on whether choosing 40/10 will or will not mean a likelihood of less latency and no interleaving... Do I understand the comments so far to say that it doesn't matter whether 40/10 or 80/20 is chosen, the same sync/profile speed/mode (profile 17A in VDSL2 Annex B mode) will be used to the cabinet and the throughput just capped after that for 40/10?

Or with 40/10, will the actual sync speed be reduced to the cabinet meaning a more stable line with less need for interleaving and less sensitivity to line noise etc?

Bottom line for me is that eliminating the 20ms or so extra matters much more than the top speed - so can asking for 40/10 possibly make any difference to that? 
Logged