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  Reply # 1610950 12-Aug-2016 20:10
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As explained though, PTM compared to ATM is bit of a boost. Personally i would love to see Adsl over PTM offered on chorus connections as a good midway, Although there is very reasonable arguable points behind why ATM is good for longer



Every EUBA connection supports ADSL2+ on VLAN10 using VCI/VPI of 0/110 (same as VDSL2) to avoid the PPPoA translation, but most RSP's don't offer this as an option.





I understood the encapsulation at the modem level to still be ATM though? News to me if not.




I am currently using PPPoE over VLAN10 0/110 on my connection. My isp also allows DHCP without PPPoE but that is rather unreliable in my experience (often when under-load the routing on the downstream will just stop till a new IP is negotiated after some delay)


Allows and offers are obviously two very different things unfortunately.



Ahh maybe it's not PTM, I might have mistakenly thought it was.


0/110 traffic is delivered on a different VLAN (0/100 is CVID + 1600), so needs the RSP to have configured this in their handover.



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  Reply # 1615967 22-Aug-2016 18:22
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yep, it is still ATM. ends up being PPPoEoA, and makes 3/5ths of stuff all difference vs plain old PPPoA.


actually that's not quite true - PPPoA does have slightly lower overheads so you would get marginally better goodput if you set yourself to 0/100.




yep fully aware of the overhead, I accept it as terminating PPPoE on my router is far more cleaner - I know there is devices that do  PPPoE -> PPPoA translation, but i found it to be a tad clunky.


I could switch to DHCP, drop the PPPoE ontop of it but simply put the isp side has a ton of issues with it that are not worth the difference.




Glad to know my study on ATM in DSL was correct however!

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