This attribute indicates the maximum number which has recently
occurred for the rxFrameMemorySize attribute.
On CQC-based ATM FPs, this number indicates the maximum
usage of receive frames for all ports on this FP.
On ATM IP FPs, this number indicates the maximum usage of
received frames in the Passport Queue Controller (PQC) ASIC.
Queuing of received frames only occurs in the PQC.
This value is reset to the current usage every 15 minutes and when
the card is reset.