Kitz Forum
Broadband Related => Broadband Technology => Topic started by: renluop on October 16, 2011, 08:31:05 PM
-
Came home the other day and there were two BTO vans parked with men working on an inspection pit near my house.
Could be mere coincidence but up to now the postcode checker has shown my and several other addresses that are connected to the same cab as a minority unable to get FTTC. ( I think our house were built in a developer's final phase). Now we can get FTTC albeit at low speeds, that seem to make it hardly worth the bother.
With insomnia and other spare moments I prepared a spreadsheet of each address's estimate, and it is confusing why one should get good speed whilst next door gets the inferior service.
For any interested the link is https://docs.google.com/spreadsheet/ccc?key=0Al6WAVYKSZrBdHhQTnkxSW45QU9LbC00cUxLZWVEV2c&hl=en_US
-
No thoughts? Is this a renluop lead balloon? ;D
-
Have you put your details into the BT checker to see what you can get via their Infinity service
http://www.productsandservices.bt.com/consumerProducts/displayTopic.do?topicId=29017
-
Yes, I am one of the lesser households!
What I fail to see is why one property can produce 25.4 Mbps whilst its neighbour only 12.5; one side of a short road 12.5, the other no service.
It's not as if they are mansions: they are 3bed linked-det,semis and small bungalows.
-
If these are just BT estimated speeds they can't be taken too literally. Have any of your neighbours actually subscribed to an FTTC service?
-
No idea TBH.
FWIW in the BT Community Forum there's a thread that has posts suggesting estimates are based on what theoretically would be the case once all FTTC lines of a cab are occupied. It's claimed that FTTC is more affected by cross talk than ADSL.
-
It's claimed that FTTC is more affected by cross talk than ADSL.
As the VDSL signal occupies a wider spectrum (which, obviously, implies that it uses higher frequencies) than ADSL, there is a lot more scope for inter-pair coupling (cross-talk), plus other RFI effects (REIN, SHINE). :-X
-
" inter-pair coupling (cross-talk)" Doesn't that make more for cross fertilisation rather than cross-talk? >:D ;D
-
If these are just BT estimated speeds they can't be taken too literally.
Except when a user complains about fantastic speeds becoming really poor.
Then they are taken as literally as literal can be (& quoted back at the said user, over, & over, & over............)
Paul.
-
@burakkucat - I was interested to learn from your post that Shine as well as Rain can upset VDSL. (sic)
Shine was a new one to me.
Now I find that there is Pain too :) (PEIN)
Cheers,
Peter
-
Now I find that there is Pain too :) (PEIN)
Peter, Do you have a reference for that acronym, please? ??? My Google-fu seems to be currently lacking . . .
-
http://tinyurl.com/6l9fmdp should gives some nice results.
VDSL test equipment generates REIN PEIN and SHINE. e.g. Telebyte 4901 Multi-Output Noise Simulator.
REIN - Repetitive Electrical Inpulse Noise, PEIN - Prolonged Electrical Inpulse Noise, SHINE - Single Isolated Impulse Noise (Dunno where the H comes from!)
Also this paper: www.ncc.org.in/download.php?f=NCC2008/2008_B2_3.pdf
Cheers,
Peter
-
Thank you, Peter. I now have some reading to do. ::)
-
Hi b'cat and Peter! Addition to task list: Precis and translate in to Basic English for lesser mortals for someone who believes
"PEIN is what a BTO engineer suffers when dropping hammer on foot". ;D
Now where's my coat!
-
@ renluop,
As in ball pein no doubt !
Kind regards,
Walter
-
BALL PEIN
That happens when to fortune tellers when crossing carelessly. :P :)
-
Since Peter kindly provided some references for me, I am now able to expand the three acronyms -- hopefully to everyones' satisfaction. I quote from DTF2.0 - Standards participation summary v2 (http://www.ist-muse.org/Deliverables/TF2/MUSE_DTF2.0_v2.pd) --
FTTC Fibre To The Cabinet
FTTEx Fibre To The Exchange
FTTx Fibre To The x (any type)
INP Impulse Noise Protection
IPTV Internet Protocol Television
ISDN Integrated Services Digital Network
ITU International Telecommunication Union
ITU-T ITU – Telecommunication sector
MELT Metallic Line Testing
NMS Network Management System
PEIN Prolonged Electrical Impulse Noise
PHY Physical Layer
PON Passive Optical Network
POTS Plain Old Telephony Service
PSD Power Spectral Density
PSTN Public Switched Telephone Network
REIN Repetitive Electrical Impulse Noise
SELT Single Ended Line Testing
SHDSL Symmetrical High-Bitrate Digital Subscriber Loop
SHINE Single High Impulse Noise Event
SpM Spectral Management
TR Technical Report
UPBO Upstream Power Back-Off
VDSLoO VDSL over Optics
VDSL Very high speed Digital Subscriber Line
-
Checker is now saying 20.9Mbps down/ 5.4 up. Wassup? :-\
-
Checker is now saying 20.9Mbps down/ 5.4 up. Wassup? :-\
No idea. Do you mean existing service checker, future service estimator or future service guesstimator?
Perhaps they have tied a better knot to join the cable that serves your side of the road? ;)
-
This one :)
http://www.productsandservices.bt.com/consumerProducts/displayTopic.do?topicId=29017
It's the one that showed 12.5 Mbps a week or so ago and previously no availability.
-
Gentlefolk,
Perhaps this is yet another BT "secret" change to factor in the fantastic improvements that Profile 17a provides ?
(Probably NBG if much over 1 km line length ?)
Kind regards,
Walter
-
Ca. 750 m +/- 20 m according to likely routes, as per this quite handy tool www.gmap-pedometer.com.
-
http://www.productsandservices.bt.com/consumerProducts/displayTopic.do?topicId=29017
I'll trust an advertisement such as that just as much as I'll trust a rat. :tongue:
-
Ca. 7500 m +/- 200 m according to likely routes, as per this quite handy tool www.gmap-pedometer.com.
That, surely, is the approximate distance to the exchange? You only need to consider your D-side length (distance to the cabinet) for a fibre product. ::)
-
Post amended to 750m +/-20. :-[
-
. . . which is around half a mile.
I would estimate a downstream speed of between 25 - 30 Mbps, all being well.
(Of course, if you are Bald_Eagle2 who knows what might happen! ;) )
-
If I have a few moments of madness I might do some comparisons with what the previous data gave.( to self ::)
-
. . . which is around half a mile.
I would estimate a downstream speed of between 25 - 30 Mbps, all being well.
(Of course, if you are Bald_Eagle2 who knows what might happen! ;) )
Now then, don't get me started ;D