EXFO FTB-8500 Series for FTB-500 - Manual (Page 184)

Traffic Analyzer Tabs
170 FTB-8500 Series and FTB-8120NGE/8130NGE
Higher Layers
Higher Layers
Press TEST, Traffic Analyzer, and Higher Layers.
Higher Layer Protocol
Note: When MPLS is enabled, the following statistics does not include the MPLS
frames.
IP Header Checksum: Indicates that IP datagrams received have invalid IP
header checksum. IP Header Checksum is only available with IPv4.
UDP Checksum: Indicates that the UDP segments received have invalid
UDP checksum. UDP Checksum is not available with TCP Throughput test
(FTB-8510B).
TCP Checksum (FTB-8510B): Indicates that the TCP segments received
have invalid TCP checksum. TCP Checksum is only available with TCP
Throughput test.