Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[William Grimsley]

I've always wondered, do ADSL line rates increase as fibre connections increase? I was thinking it was possible seen as ADSL crosstalk decreases.

[jid]

I believe this is the case to an extent, but VDSL does present noise onto lines in a copper bundle, so could possibly cause ADSL to be affected - one of the more knowledgeable on here will know more than me

[4candles]

[William Grimsley]

Yeah, this is what I was thinking. I wonder what my ADSL speed would be now that most users have moved over to FTTC? It was around 5/1 could be 7/1 now.

[kitz]

I would expect it will.  Depends how many are on the DSLAM/MSAN.   Crosstalk though isn't quite as noticeable on ADSL due to less tones in the spectrum.

I was one of the first on a shiny new BE* MSAN the day it went live and over the course of about 6 yrs lost about 3Mb on 24Mbps -> 21Mbps (cant recall exact figures now).   Most of the cross talk tended to be around the tones used for 8-9 Mbps.   I saw a marked increase when O2 started putting their users on the MSAN en-mass after they bought out BE*.

The other thing to bear in mind... as more users move to FTTC then MSANs will have more free ports.  I would imagine that any operator with common sense would eventually shut down MSANs and consolidate users on to as few MSANs as possible. Consolidation would cause increases again. 

There is no point running idle equipment.   My exchange isnt particularly large and I dont know how many BT MSANs there are, but last time I was there I was surprised to see that Sky alone had at least half a dozen. 

[William Grimsley]

Interesting. Using the BT Broadband Availability Checker, I checked some phone numbers that are close to the exchange and found that there was an increase in ADSL speeds after the fibre cabinets had been activated.

[kitz]

Mine has for adsl has stayed exactly the same over the past 3.5 yrs.  See below for screen caps.
The first is sometime early 2013 when I was using LLU Annex_M and hadn't yet got fttc.  I was syncing at ~21Mbps down 2.5 up by that time. Originally I was able to get the full  24/2.6 Mbps.  Annex_M is where it takes away some of your downstream to use for upstream.   
The 2nd is one Ive just done now.

I have several  screen shots retained for the past few years and although adsl estimates have stayed the same, its interesting to see how VDSL has changed.  As far as I can see it only started changing in 2014 when they added the impacted row.

Code: [Select]

2013
Up to 62.6 Up to 20

2014
80 63.3 20 20
75.6 50.5 20 16.3


2015
80 70.6 20 20
75.1 43.7 20 11.6

2016
80 67.7 20 20
70 39.8 20 10