The value of tmnxSubProfEgrAvgFrameSize specifies the
average frame size value to be used in the adjustment of the subscriber
aggregate rate to account for the per packet variable expansion of the
last mile for the specific session used by the subscriber host.
The value 0 will disable the adjustments and cause the value of
tmnxSubProfEgrEncapOffsetMode to be ignored.
The value of tmnxSubProfEgrAvgFrameSize is only used for subscribers
serviced by specific HSMDA and ignored otherwise.