Seamless Failover
Redundant power with seamless failover is available on the H5A Multisensor camera. Seamless failover
allows the camera to transition between PoE and auxiliary power sources without any interruption of camera
operation or video recording. This is mainly useful if you want redundant power sources so that backup
power will be available if one power source goes down.
Note: Seamless failover is only guaranteed when “full power” is available on the PoE port.Auxiliary
(Aux) power is always assumed to be “full power,” meaning that there is enough power available for
all possible camera functions. PoE, on the other hand, has many different power classes and the
product’s functionality may depend on the PoE power class that is available.
For example, the H5A Multisensor camera requires a Class 6 (60W) PoE for full operation (IR ring
connected and full IR output). However, it can also operate on Class 4 (30W) power with limited IR.
If a Class 3 PoE (15W) is connected, the camera will boot and display an “insufficient power”
message. Therefore, if the camera is connected to a Class 4 PoE source while running on Aux
power and using full IR power and the Aux power source is disconnected, the camera will most
likely overload the PoE Power Over Ethernet (PSE) and reboot. However, if the camera is not using
an IR ring and Aux power is removed, the Class 4 PoE power source would be adequate to
guarantee seamless failover.
Important: There is a downside to having seamless failover if you aren’t using this functionality and
are connecting your cameras to PoE-enabled switches while running the camera on Aux power.
Since the PoE connection remains active when running on Aux power, if the camera is connected to
a PoE-enabled port on a switch, the switch by default will allocate some of its overall power budget
to that port.
For more information about cable connections, see Connecting to Power, Audio, and External Devices.
Connecting PoE and Auxiliary Power Simultaneously
To use the seamless failover feature, connect both PoE (1) and auxiliary power (2) as shown in the
illustration below. See Connecting Cables for a Connecting Cables (Pendant), Connecting Cables (Surface),
or Connecting Cables (In-Ceiling) for more information.
Seamless Failover 67
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