Are modems, made for a more recent DSL standard, downwards compatible with older DSL technology

adslcompatibilitydslmodemvdsl

I understand that older DSL modems aren't compatible with newer technology, but is the case same the other way around? I.e.:

  • Is VDSL2 modem compatible with a VDSL connection? What about with ADSL or ADSL2 line?
  • Is VDSL modem compatible with an ADSL/2 connection?
  • Is ADSL2 modem compatible with an ADSL connection?
  • Or could it be so that *2 modems are downwards compatible only with *2 connections (this is just guessing…)

Or is there other logic? Or are they all just incompatible?

Best Answer

VDSL is not compatible in any way with ADSL.

VDSL2 capable line cards (the ISP end) are compatible with ADSL2+ ADSL2 and ADSL - so you can use these modems on a VSDL2+ connection - Its easier to find on this juniper networks document, as well as this broadband-forum presentation - I am unclear if its possible to use a VDSL2 modem with an ADSL connection

ADSL 2+ should work with ADSL2 and ADSL in both situations

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