The value of tAtmTdpWeight specifies the relative weight assigned
to this ATM traffic descriptor with respect to ATM VP shaper scheduling.
The value of tAtmTdpWeight is only relevant for MDA where the value
of TIMETRA-CHASSIS-MIB::tmnxMDAAtmMode is equal to max16kVc, and is
ignored otherwise.
If the value of tAtmTdpWeight is not specified when the conceptual row
is created, the weight is derived from the ATM service category:
CBR 10
rt-VBR 7
nrt-VBR 5
UBR+ (nonzero MIR) 2
UBR (zero MIR) 1.