Motorola PTP 600 Series - page 35

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3.3.3.2 External DC Supply and AC Supply
To give redundancy through the use of mains and DC supply.
Figure 9 - External DC Supply and AC Supply
3.3.3.3 External DC Supply and Redundant AC Supply
To guard against mains failure, DC supply failure of PTP 600 Series Bridge PIDU Plus failure.
Figure 10 - External DC Supply and Redundant AC Supply