Occasionally, the new service may require additional testing. The EtherSAM (ITU-T Y.1564) as defined in the default or customized frameworks may not provide the information required to understand why a service does not work as expected at the layer 4 of the OSI model, this is especially true for TCP.
To address such shortage, the IETF and multiple vendors and service providers worked on a standardized framework for TCP throughput testing, such testing methodology is called RFC 6349.
Lumen uses EXFO as our vendor for test instruments and service assurance equipment in its central offices, in addition to the RFC6349 test suite, EXFO has also provided their own contribution to TCP testing, they call this test methodology application ExacTCP, it is based in 6349 and other RFCs that provide further standardization, TCP window control, capability of running a single TCP stream on the pipe and reduction of the number of variables at play compared to other testing methodologies. Both RFC6349 and ExacTCP methodologies implemented by EXFO are FPGA hardware based and dedicated just for the test.