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    Line Attenuation been going up lately...

    This is a discussion on Line Attenuation been going up lately... within the Sky Broadband (Fibre) Help forums, part of the Sky Broadband help and support category; There are 3 sections to an FTTC broadband connection: The copper wire between the end user and the FTTC ( ...

    1. #81
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      Re: Line Attenuation been going up lately...

      There are 3 sections to an FTTC broadband connection:
      1. The copper wire between the end user and the FTTC (DSLAM) cabinet. Any problem in this section will result in a reduction of sync speed.
      2. Backhaul which is optical fibre from the exchange to the ISPs point of presence (pop). This will be leased from Openreach or other network service providers. Congestion here can be alleviated by the ISP leasing extra bandwidth.
      3. This leaves the fibre connection between the DSLAM cabinet and the local exchange. This is almost exclusively owned and managed by Openreach. The bandwidth available will be set during the design stage based on the maximum capacity of the cabinet and the contention ratio which I believe to be assessed at 50:1 for residential lines. For example maximum downstream capacity for a 288 line capacity where all lines are short enough to sync at 80Mb/s would be 288*80/50=460.8 Mb/s. Even at 1Gb/s this would be less than 4Mb/s if all users were simultaneously attempting to download an HD video stream.

      Unless Openreach provide a service with a lower contention ratio there is neither an incentive or a requirement for them to upgrade the fibre links between their FTTC cabinets and the local exchange.


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    3. #82
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      thewoe is offline Sky User Member
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      Re: Line Attenuation been going up lately...

      Quote Originally Posted by seawright View Post
      There are 3 sections to an FTTC broadband connection:
      Quote Originally Posted by seawright View Post
      1. The copper wire between the end user and the FTTC (DSLAM) cabinet. Any problem in this section will result in a reduction of sync speed.
      2. Backhaul which is optical fibre from the exchange to the ISPs point of presence (pop). This will be leased from Openreach or other network service providers. Congestion here can be alleviated by the ISP leasing extra bandwidth.
      3. This leaves the fibre connection between the DSLAM cabinet and the local exchange. This is almost exclusively owned and managed by Openreach. The bandwidth available will be set during the design stage based on the maximum capacity of the cabinet and the contention ratio which I believe to be assessed at 50:1 for residential lines. For example maximum downstream capacity for a 288 line capacity where all lines are short enough to sync at 80Mb/s would be 288*80/50=460.8 Mb/s. Even at 1Gb/s this would be less than 4Mb/s if all users were simultaneously attempting to download an HD video stream.

      Unless Openreach provide a service with a lower contention ratio there is neither an incentive or a requirement for them to upgrade the fibre links between their FTTC cabinets and the local exchange.



      So basically im supposed to deal with having 8-9mb every evening and only 12mb in the day when i was getting 16-18mb all day for 5 months?

    4. #83
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      Re: Line Attenuation been going up lately...

      Been 2 months now, Have not resync’d once and G.INP has yet to come back, Im still synced at 14.5mb but in the day getting 12.6 (which is my threshold speed according to bt wholesale) and only getting max 9.6 at night.
      Attached Thumbnails Attached Thumbnails Line Attenuation been going up lately...-719468ab-793a-448b-90d3-30a7920667e0.jpg  

     

     
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