Kitz Forum
Computers & Hardware => Networking => Topic started by: 111888 on September 23, 2021, 12:49:14 PM
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hi im with sky fttc, and I use a third party router tp link.
My question is why does tp link use Annex A on auto discovery? , I tried checking for Annex B but it doesn't appear on the list to choose. Having to use Annex A can it cause issues? As I live in the UK.
I thought BT and Sky use Annex B type, as A is north America, and B is used in UK.
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Annex B isn’t used here, I think it is in Germany though. Annex B is DSL over ISDN. Annex A is what we use in britain.
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Annex B isn’t used here, I think it is in Germany though. Annex B is DSL over ISDN. Annex A is what we use in britain.
The confusion is there are two types of annex, the hardware and the band plan. As someone put it on the TalkTalk forum:
Openreach uses an Annex B bandplan (tone set) from the VDSL2 spec (G.993.2) over Annex A physical infrastructure. So for the UK, the modem hardware/firmware needs to be Annex A, but it will sync using Annex B.
Because apparently networking terminology wasn't complicated enough.
You can easily identify the hardware version though as ISDN uses the same size plug as ethernet ports vs POTS (Annex A hardware) that uses the smaller RJ11 with only two pins.
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thanks.