ASA 5506 connecting phone line using RJ11 TO RJ45

No . You need an ADSL router with the inside interface to manage the phone line conversion

At the end of the day it's all just copper wires. I dont know much about the ASA5506 but if the convert connects the RJ11 and RJ45 using the correct pairs, and if the ASA5506 can take a straight DSL signal, it should work. If the RJ11 is CAT3 cable you will be limited to 10Mbps.

RJ 11 circuits are just twisted pairs and yes are limited by speed. But I don't think you can connect them as you are trying to do.

Thanks guys,

ok so cabling is cat 5 so next question what about if i use that converter then plug into the WAN port of the Router and connect using PPPoe?

If you plug the WAN port of the Netgear into the modem and the modem is standard ADSL you should be able to use PPoE at the router

As John mentioned, it will depend on if the ASA5506 can take a DSL connection. It will need to know how to interpret a DSL signal like the Netgear can. If im not mistaken, the netgear model you mentioned earlier has a RJ11 port and it can interpret the DSL signal.

you plug the WAN port of the Netgear ...  <-- The Netgear is your modem. I should have said WAN port of the ASA device into the modem.

No you will not be able to that.  The ASA has ethernet ports, not DSL ports.  Your Netgear was made with a DSL modem to terminate the DSL signal.  The ASA 5506 does not have a DSL modem to terminate DSL, just Ethernet.  So no matter how you cross over the cables etc.. it will not work.  Different signaling.   What you might be able to do is put your  netgear into bridge mode.  Im not a netgear guy so you would have to check on that.  If you put it into bridge mode, then the netgear will terminate the DSL signal, and your ASA will do the PPPoE authentication.  That will depend on whether or not your netgear will do that.  If it can go into bridge mode, then there is pretty much zero configuration on the netgear (other than putting it in bridge mode) and all of the config will go on the ASA.

Here is an example of PPPoE on the ASA:

https://www.petenetlive.com/KB/Article/0000831

Hope that helps.

Yes but you should be able to connect the ASA via Ethernet to the Netgear modem. I corrected that above. Then (assuming flexibility in the ASA Settings) you should be able to connect up to the ADSL box.  

I have done this with different gear

John
Yes you can hook the ASA up to the netgear via the ethernet port.    If the netgear is not in bridge mode, then it will provide a private address to the ASA and the netgear will terminate DSL and PPPoE.  If the netgear goes into bridge mode, then the netgear will terminate DSL, but the ASA will terminate the PPPoE.  Either way he has to have the netgear in the connection.  It sounded like the original author wanted to do away with the netgear and go straight to the ASA but that is not an option for him.

Of course you cannot use the ASA in that latter manner, but I / we are providing an option to hook up the gear . I dispensed with the idea of using the ASA with a phone (ADSL) Connection right away

No problem John.. not trying to step on your toes.  Just providing another affirmative on what will and won't work.  In your second comment you said "But I don't think you can connect them as you are trying to do".  When I read "I think", that sounds like an answer that goes like well I'm not positive but pretty sure...  So I wanted to follow up with another affirmation.  Thats all.  The end game is to help the original poster.  Not trying to dis you man.

Thanks. I think we have the author on a track that will work.