Motorola PTP 400 Series - Manual (Page 33)

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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.
DC Out
DC In
To Network
Equipment
To ODU
AC Mains
+
+
-
-
DC
Supply
Power Ethernet
Figure 7 - 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 or PTP 400 Series Bridge PIDU Plus failure.
DC Out
DC In AC Mains
+
+
-
-
DC
Supply
Power Ethernet
DC Out
DC In
To Network
Equipment
To ODU
AC Mains
+
+
-
- Power Ethernet
Figure 8 - External DC Supply and Redundant AC Supply