Thanks to everyone for all the info.  This was a great help.

On 03/08/2017 03:07 PM, Grand Avenue Broadband via Mikrotik-users wrote:
> One reason is to augment MikroTik's rather limited support of UPS brands and 
> models.
>
> You can power the main router at a remote tower or station dually from a UPS 
> via POE; and also from line power over the barrel jack at a different, higher 
> voltage.  Then you run a simple periodic script to query the router's 
> voltage.  If it's the lower voltage, local power has failed and you're 
> running off the UPS.
>
> On models that have dual AC power inputs (like the CCRs) you can do the same 
> by querying whether the one connected directly to line power is operational.
>
>> On Mar 8, 2017, at 12:44 PM, Nick Bright via Mikrotik-users 
>> <[email protected]> wrote:
>>
>> I don't know what the actual use case is for wanting dual power supplies
>> On 3/1/2017 8:15 AM, Faisal Imtiaz via Mikrotik-users wrote:
>>> Keep in mind that most Mikrotik (Routerboard) devices support being powered 
>>> via POE
>>> Check the specs and or the device for the specific models.
>>>
>>> All of the such (Routerboard) devices can be powered via the DC power Jack 
>>> as well as the POE-IN port at the same time, the internal circuitry of the 
>>> Mikrotik will use the Higher voltage as primary power source, and the other 
>>> as a secondary power source.
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-- 
Regards,

David Funderburk
GlobalVision
864-569-0703

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