DSL Overhead Value - ATM Encapsulation Type

I need some help setting up QoS properly. The setting in question is DSL Overhead Value - ATM Encapsulation Type




I have 15Mb/760Kb DSL from TDS. I'm trying to figure out a setting related to proper QoS management.

Here is all i've found:
Modem: Actiontec GT704d
DSL Settings
VPI:0
VCI:35
Mode:MMODE
QoS:UBR
WAN IP: DHCP
DSL Mode: ADSL2PLUS
Speed: 16380/893 Kbps
ATM QoS Class: UBR

For those curious, running...

DSL Overhead Value - ATM Encapsulation Type