HP 37717C User Manual page 184

Selecting and Using "Other" Features
Running Self Test
2 Connect STM-1/STM-4 1550 nm OUT to STM-1/STM-4 1550 nm IN
via an Optical Attenuator set to 10 dB.
3 Run the STM-1/STM-4 OPTICS TESTS.
Datacomm Tests:
If Option A1T[A1U] or A3R [A3S], SDH Module, is fitted, the Datacomm
RS449 port is not tested under ALL TESTS
To test the Datacomm port:
1 Choose SDH TESTS.
2 Make the following connections on the Datacomm port.
3 Run the SDH TESTS.
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