Ethernet
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The ideal TCP transfer time is based on the Maximum achievable TCP transfer rate, calculated based on the
Bottleneck Bandwidth (BB) and the layer 1-2-3-4 overheads associated with the network path. The actual TCP
transfer time measures the time it takes to transfer data.
Transfer Time Ratio =
Actual TCP Transfer Time / Ideal TCP Transfer Time
Example of an ideal TCP transfer time based on a 1500 Bytes size MTU and 100MB file download
TCP retransmission is done when TCP segments are lost during transmission or an acknowledgment is
missing. Segments can be retransmitted more than once.
There is no direct correlation between the number of Ethernet frames lost at the physical layer and the
number of TCP retransmission, since a single lost acknowledgment could trigger many retransmission.
TCP Efficiency =
Transmitted Bytes + Retransmitted Bytes/Transmitted Bytes x 100
The Buffer Delay represents the increase (or decrease) in Round Trip Time (RTT) during a TCP throughput
test compared to the baseline RTT.
A large RTT Buffer delay indicates that the network is experiencing congestion and that segments are
being delayed.
Buffer Delay =
Average RTT – Baseline RTT/Average RTT x 100
Summary of Contents for MTX150 Series
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