The value to use in the NAS-Port-Type RADIUS Attribute (attribute
number 61) for DSL interfaces in the RADIUS access and accounting
messages:
virtual Used for Virtual interfaces.
sdsl Used for Symmetric DSL.
adsl-cap Used for Asymmetric DSL, Carrierless Amplitude Phase
Modulation.
adsl-dmt Used for Asymmetric DSL, Discrete Multi-Tone.
idsl Used for ISDN Digital Subscriber Line.
xdsl Used for Digital Subscriber Line of unknown type.