According to Enc. Britannica

A wrap-around test is a cost-effective method for testing hardware, cabling, and connections, A signal is generated by one instrument then wrapped around the test set, through the ITA, and measured by another instrument. The system performs standard DC measurements. RF spectrum analysis, waveform analysis. Ethernet validation. USB validation, and JTAG testing. Other instnimentation includes global positioning system (GPS) simulation, electronic loads, power supplies, dense switching, and general-purpose data acquisition.