** — Switch
M — Microphone
S — Speaker
External Power Failover
If the camera has power available from both an external Aux power supply and a PoE PSE (Power Sourcing
Equipment) device, the camera will draw power from Aux. In the event that the camera loses power from the
preferred Aux power supply it can transition to drawing power from the PoE PSE device.
H6A and H6X camera models respond differently if they lose power from the preferred Aux power supply. If
an H6X camera loses power from the preferred Aux power supply, the camera is capable of a
SeamlessFailover, meaning the H6X can switch to drawing power from the PoE PSE device without
interruption. Conversely, the H6A camera models experiences a Non-Seamless Failover, meaning the
camera may power off while waiting to transition to PoE power.
Non-Seamless Failover for H6A models
If the camera loses Aux power, the camera will power-off while waiting to transition to PoE power. If the
external Aux power re-energizes, the camera might reboot while transitioning back to using Aux power. The
camera might not reboot if the external Aux power supply reacts quickly enough to the increase in load.
Note: Ensure that sufficient power is manually reserved on the PSE, as the camera will not request
PoE power until the camera loses Aux power.
Seamless Failover for H6XModels
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 PoE Class 4 (25.5W) "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 depends on the PoE power class that is available.
If the PSE demotes the camera to PoE Class 3 (13W), the camera will boot and display an “insufficient
power” message. Therefore, if the camera is connected to a Class 3 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 PSE and reboot. However, if the camerais not using IR LEDs and Aux power is
removed, the Class 3 PoE power source would be adequate to guarantee seamless failover.
External Power Failover 21
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