Throughput is the average number of 'Frame Re-
lay Information Field' bits transferred per
second across a user network interface in one
direction, measured over the measurement inter-
val.
If the configured committed burst rate and
throughput are both non-zero, the measurement
interval
T=frCircuitCommittedBurst/frCircuitThroughput.
If the configured committed burst rate and
throughput are both zero, the measurement in-
terval
T=frCircuitExcessBurst/ifSpeed.