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This seems like it should be simple. However, modem-routers don't always have their modem speeds mentioned in their specifications.

For example - this TP-LINK router on Amazon. It's specifications' page doesn't mention what is its modem's speed. The wireless can work up to 300 Mbps. But what about the DSL? How do I find that out?

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You find out by looking up the DSL standards that the modem supports. DSL standards give you a theoretical maximum speed the link can offer. Note that there are different variants of DSL, such as ADSL and VDSL.

A list of ADSL standards is available on Wikipedia, for example. You'll find VDSL2 speeds here.

Of course, in reality, those speeds may be lower due to various influence factors, most importantly the distance between your modem and the exchange. Also, the carrier may artifically lower your connection speed.

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  • Thanks. +1. That looks very good. Except... Wikipedia caps out at ITU G.992.5 Annex M (24 Mbps). The modem I mentioned also has ITU-T G.994.1 (G.hs) and ITU-T G.995.1 . Any idea where I can find the speeds for those? – ispiro Apr 12 '15 at 11:37
  • @ispiro: It seems that both are just handshake protocols, don't directly determine the link speed. (Not entirely sure though.) – user1686 Apr 12 '15 at 11:55
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    @ispiro As grawity said, those don't have speeds. They "provide a flexible mechanism for Digital Subscriber Line (DSL) transceivers to exchange capabilities and to select a common mode of operation". – slhck Apr 12 '15 at 12:16
  • @slhck Hmmmm. So the question returns. It seems there's no way to know if a modem will support 100Mbps connections. – ispiro Apr 12 '15 at 12:47
  • @grawity (See my previous comment.) – ispiro Apr 12 '15 at 12:47
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I have DSL and i would just run the speedtest.net by ookla. This may not give you your modem capability max, but will give you the speed your receiving and sending data through your combined connections,

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