06-19-2012 10:17 PM
Hi there,
An end user is looking to connect 21x IP Cameras to the switch and they require at least 6W port port. Now, the datasheet states that each port on the SF300 provides 15.4W.
I need to double check so that the end user will not start connecting the IP Cameras and then half of them might not fire up.
Can anyone help me to confirm this please?
Thanks!
Regards,
Kelvin
06-20-2012 05:23 AM
Hi Kelvin,
Check out the datasheet on the product, i have copied the POE section of that datasheet below.
I would have preferred to understand the Class of POE device or the maximum power consumed by the camera.
The Video camera manufacturers datasheet, should be able to tell you exactly how much power should be consumed and the power class of the camera, to better allow you to plan for the appropriate switch..
Anyway, there is a power budget within the switch that is spread across the switch ports, or directed at a few switch ports.. It depends on how the Powered Devices negotaite POE.
I will use the SF300-24P and the statistics from the table above in my example below.
The switch as you can see from the table above can support 180W over 24switch ports. or ;
180Watts / 24 ports = around 7.5 watts of power can be supplied to all ports at the same time.
In your case the calculation would be ;
180Watts / 21 ports = around 8.5 watts of power can be supplied to 21 ports at the same time.
Or, if a Powered Devices (PD) needs more power on a switch port, it can be supplied, depending on how the Powered Device negotiates POE..
But my switch is very smart in how it manages and allows you to manage Powered Devices (PD), such as your video cameras.
PoE implements on the switch in the following 3 stages:
PoE supports two modes:
But have a look at the switches administrators guide, the chapter called "Managing Power-over-Ethernet Devices"
regards Dave
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