Cisco Model GS7000 4-Port Node 1 GHz with 42 54 Split Installation Guide
Chapter 4 Setup and Operation
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6 Using a DVM, measure the DC voltage at the optical test point and record the
value.
7 Check the connection of the optical connector. Make sure the optical connector is
seated and verify that the fiber bend radius is greater than 1 inch.
WARNING:
When handling optical fibers always follow laser safety precautions.