Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.



759 posts

Ultimate Geek
+1 received by user: 98

Subscriber

Topic # 111594 8-Nov-2012 13:37 Send private message

Hi There

I've just switched to Telecom from Vodafone. As I expected my speed dropped a bit but I have noticed something a little odd. The actual sync rates I'm getting are higher than the attainable rates. Is this what you would expect?

I have a new master fliter in the ETP with a single CAT5e running from the filter to my modem (Draytek Vigor 120).

Line stats are as below.

Cheers
Duncan


--------------------------- ATU-R Info (hw: annex A, f/w: annex A) -----------
DSL Modulation : ADSL2+(G.992.5)
State : SHOWTIME
DS Actual Rate : 8301872 bps US Actual Rate : 993204 bps
DS Attainable Rate : 7828000 bps US Attainable Rate : 993000 bps
DS Path Mode : Fast US Path Mode : Fast
DS Interleave Depth : 96 US Interleave Depth : 1
NE Current Attenuation : 34 dB Cur SNR Margin : 11 dB
DS actual PSD : 18. 7 dB US actual PSD : 12. 1 dB
ADSL Firmware Version : 321311_A
-------------------------------- ATU-C Info ---------------------------------
Far Current Attenuation : 17 dB Far SNR Margin : 11 dB
CO ITU Version[0] : 00004244 CO ITU Version[1] : 0000434d
DSLAM CHIPSET VENDOR : < BDCM >

Create new topic
386 posts

Ultimate Geek
+1 received by user: 68

Trusted
Spark NZ

  Reply # 715536 11-Nov-2012 20:42 Send private message

This is fairly normal behaviour of DSL.  

What happens is that for stability reasons you never connect at the absolute maximum connect rate.  Instead there is a certain margin left to deal with the fluctuating state of a copper line.  This is completely normal - line conditions will change slightly throughout a day.  

So what has happened in this instance is that you have connected, and the line was slightly better.  You got a good connect rate, and as per Telecom's network, there is 12db left to deal with noise.  Since that time your line has got slightly worse, but because there is a margin there for things like this, the connect rate stays the same, but you lose some of your margin - you'll notice your noise margin is no longer 12db - it's dropped to 11db.  If you restarted the modem now, you'd connect at those "attainables", and your SNR margin will be 12db again.

All in all, this is normal behaviour of any DSL line.




My views are my own, and may not necessarily represent those of my employer.



759 posts

Ultimate Geek
+1 received by user: 98

Subscriber

  Reply # 715538 11-Nov-2012 20:44 Send private message

That makes sense, thanks for the reply:)

Create new topic




Twitter »
Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:




News »

Trending now »
Hot discussions in our forums right now:

Windows 10 announced, as well as developer preview
Created by macuser, last reply by Behodar on 2-Oct-2014 19:42 (107 replies)
Pages... 6 7 8


What time will the Apple Store online be selling the iPhone 6?
Created by scotiwis, last reply by Bextinaa on 2-Oct-2014 19:38 (200 replies)
Pages... 12 13 14


Moment of Truth?
Created by BarTender, last reply by JimmyC on 29-Sep-2014 09:16 (441 replies)
Pages... 28 29 30


Can i have 2 ISP's at home?
Created by ReckITT, last reply by Lazarui on 30-Sep-2014 18:15 (49 replies)
Pages... 2 3 4


Samsung Galaxy S4
Created by beenz, last reply by fizzychicken on 2-Oct-2014 19:46 (21 replies)
Pages... 2


Why is your nickname what it is, what are the origins of it?
Created by Presso, last reply by BlueShift on 2-Oct-2014 16:24 (96 replies)
Pages... 5 6 7


iPhone 6 From Spark - Order Dates and Pricing?
Created by Otagolad, last reply by Aquarius on 2-Oct-2014 19:31 (354 replies)
Pages... 22 23 24


Harvey Norman's Biggest Ever Retail Sale
Created by DravidDavid, last reply by joker97 on 2-Oct-2014 14:24 (30 replies)
Pages... 2



Geekzone Live »
Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.

Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.