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: Winter mode  (Read 130 times)

Weaver

  • Addicted Kitizen
  • *****
  • Posts: 9103
  • Retd sw dev; A&A; 4 ◊ 7km ADSL2; IPv6; Firebrick
Winter mode
« on: October 18, 2020, 03:08:10 AM »

I posted something elsewhere ages back (canít remember where) about how summer temperatures reduce dsl link speeds; we are assuming that itís to do with temperature anyway. In late spring we start to see this, around the end of april. Iím not sure when the autumn equivalent is though. Temperatures have possibly been going down here recently, although this last week has been gorgeous.

My internet sync speeds seem to be about to rise, because I see that SNRMs are improving. If I were to resync the various lines at the right time then I might secure an improvement in speed anyway, but possibly at the expense of reliability.
Logged

displaced

  • Reg Member
  • ***
  • Posts: 211
Re: Winter mode
« Reply #1 on: October 18, 2020, 12:32:54 PM »

Iím in the same boat - looking forward to the winter speed boost.

The effect is quite dramatic for me. 52-54 D/S in the summer, 60-61 in winter. Iíd hazard a guess that the effect is more dramatic on longer lines (more copper to warm/cool) and even more so on lines like mine that long but not too long.

I try to keep an eye on the downstream attenuation rather than attainable sync.  Partly because Iím almost always synced above attainable anyway. Also, I take the attenuation as a better feel for the physical state of the line. 

My attenuationís about 21-22 in summer and 17-18 in winter. I think Iíve still got a month or so down here in the south-east before itíll be worth resyncing to get a nice stable speed!
Logged
Vodafone Landline+FTTC: Huawei DSLAM, HG612 modem, pfSense router, Ubiquiti access points. GigE home LAN with Netgear ProSafe switches. Mac, FreeBSD and Win10.

Weaver

  • Addicted Kitizen
  • *****
  • Posts: 9103
  • Retd sw dev; A&A; 4 ◊ 7km ADSL2; IPv6; Firebrick
Re: Winter mode
« Reply #2 on: October 18, 2020, 08:37:21 PM »

Thanks - I should have thought of looking at the attenuation. I need to find some record of exactly what it was in the summer. I was looking at the SNRM for each of my four lines and I noticed that the downstream SNRM is about 0.5dB higher than the target of 3dB, in some cases more, during the better half of the day and goes down to around 3dB at worst. It was this that started me thinking about this subject.

Current values, down / up :
    line 1: 65.0 / 41.0
    line 2: 64.5 / 41.4
    line 3: 65.0 / 40.9
    line 4: 64.5 / 41.2
« Last Edit: October 18, 2020, 08:53:14 PM by Weaver »
Logged
 

anything