tAtmTdpSir identifies the sustained information rate
in kilobits per second.
The default Sir is determined by the Service Category.
The following default applies to Sir that is modifiable
depending upon a given service category:
Applicable Service Category Default Sir Value
RT-VBR 0
NRT-VBR 0
Note that for the service categories given above,
the value of Sir must be less than or equal to
the value of Pir.