This attribute indicates the Maximum Burst Size (MBS) of the
FRF.5 ATM VCC for all cells (with CLP=0 and CLP=1).
The mbs01 is derived from the End Point traffic parameters using
the conversion policy of the connectionTransferPriority. The
conversion policy is defined under the ModuleData
FrameRelayService AtmNetworking TransferPriority/n component.