Dear friend!
1. You can use the OD tool installed on the U2000 or NCE to perform the test. You can also use a dedicated meter to perform the test.
2. When no OTN link is available, you can use an optical power monitoring board (such as OPM8) to detect the OSNR of optical signals.
3. For number of MDU subracks does the regeneration repeater need to be installed?
This is calculated based on the length of the optical link and the resulting OSNR penalty.
For more information, please click:
Link performance through OSNR
Optical doctor OSNR
Thank you!