Issue: we recently installed an ATM DS3 circuit. We contracted with our telecom provider for 15 Mbits. I configured the vbr-nrt at 15000 (per the telecom engineer) on each end of the pvc circuit. However, when I test the circuit throughput with iperf I am only getting 12.2 MBits. The telecom provider says this is in line with expectations. I know ATM will have additional overhead than other protocols, but 19% seems like a lot to me. Can anyone provide additional insight into this?
Thanks in advance.