EXFO FTB-8510B Guia Del Usuario página 777

Summary Tabs
Test Summary
NI/CSU Emulation: Indicates that the FTB-8105/15/20/30 unit is
emulating the loopback capabilities of a network device in order to
respond to an incoming loopback code of a DS1 signal. It can also
be used to manually configure a payload or DS1 loopback adapted
to the frame format.
Multi-Channel SDT: Indicates that the RX signal is looped to the TX
port at the highest termination layer and the RX signal is monitored
at each layer defined in the test case.
Coupled:
Indicates that both TX and RX parameters are coupled when the
Coupled check box is selected.
Indicates that TX and RX parameters are independent (decoupled)
when the Coupled check box is cleared.
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SONET/SDH Application