This attribute specifies the committed burst size (Bc), and represents
the amount of data that the network FRF.5 ATM VCC agrees to
transfer under normal conditions. A conservative Bc value would be
the sum of the Bcs of all the individual FrAtm Dlcis multiplexed by
the VCC.
The bc is converted into ATM service parameters according to the
conversion policy specified by the connectionTransferPriority
attribute. The conversion policy is defined under the ModuleData
FrameRelayService AtmNetworking TransferPriority/n component.