tAtmTdpDescrType identifies the types of ATM traffic descriptor.
The default is determined by the value of tAtmTdpServCat.
The following default rules apply:
Applicable Service Category tAtmTdpDescrType
UBR clp0And1pcr
CBR clp0And1pcr
RT-VBR clp0And1pcrPlusClp0And1scr
NRT-VBR clp0And1pcrPlusClp0And1scr