Annex M Backwards compatible

Unanswered Question
Mar 24th, 2010

Hi, I have a ADSL 2+ (20M/800K) with a router Zyxel P660R. I want to change the router for a Cisco Router and I'd like to buy an Annex M (887M for example), so in the future I can use this router. Can I use the 887M with ADSL, ADSL2, ADSL 2+, Annex A? or it is only compatible with ADSL 2+ Annex M?

Thanks

I have this problem too.
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Paolo Bevilacqua Wed, 03/24/2010 - 02:21

You can use it with all the standards you mentioned. Annex M is just an option decided by telco..

jmprats Wed, 03/24/2010 - 02:58

So, if I'm not sure what ADSL I will have in the future, the best  option is to buy Cisco 887M because it has all ADSL options, isn't it?

Paolo Bevilacqua Wed, 03/24/2010 - 05:17

Not said, in some countries Annex M will never be introduced. It's a local telco decision.

jmprats Wed, 03/24/2010 - 05:23

sorry, then the 887M is  the best option because it supports all kinds of ADSL, so with it I can not go  wrong with the choice of router. Will work with all. With one ISP with the other, ... Right?

Paolo Bevilacqua Wed, 03/24/2010 - 06:22

Again, depends on where you are. You may find that distributors do not carry the M type your country, because local telco do not support it.

jmprats Thu, 03/25/2010 - 00:45

Thanks. But I say 887M is the best option (if you can pay for it) because if now my telco do not carry Annex M, I can connect with the 887M with AnnexA and if in the future my telco carry Annex M (or I change my ISP) I can connect wit 877M too (with Annex M or not). Right? But If now I buy a 887 (without Annex M), now I can connect to my telco, but if I want to change to a telco with Annex M in th future I will have to buy another router. Right?

jmprats Thu, 03/25/2010 - 06:03

I have not yet verified (I'm in process). Why say that? Is  it hard to find?
Anyway, do you agree to my previous  statement?

"But I say 887M is the best option (if you can pay for it) because  if now my telco do not carry Annex M, I can connect with the 887M with  AnnexA and if in the future my telco carry Annex M (or I change my ISP) I  can connect wit 877M too (with Annex M or not). Right? But If now I buy  a 887 (without Annex M), now I can connect to my telco, but if I want  to change to a telco with Annex M in th future I will have to buy  another router. Right?"

Am I right?

Paolo Bevilacqua Thu, 03/25/2010 - 06:21

Are you in the UK?

At the moment, Cisco doesn't support Annex M in the UK,

I woudl appreciate if you could avoid rating in the middle when what I'm telling you 100% correct.

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