Step 3 Verify the polarity by measuring the voltage between the DC cable leads.
When measuring, check that the positive (+) lead and the negative (–) lead match the + and – labels on the
DC-input PSU's terminal block.
If the DC inputs are powered from separate sources, also check that you have wired the cables straight across
to their respective A source and B source, and respective negative and positive terminals. Crossed positive or
negative cables constitute a severe safety hazard.
Powering on the Router
21
Powering on the Router
Power Up a DC Power Supply Unit
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