Another POE Question

[fady]

Hi All,

I plan to use RPI's as either Openelec Media Centers or DLNA control points around the house, (7 units for now). I have been thinking about the cleanest solution and this obviously involves POE. I have an 8 port POE switch witch would be perfect and I intend to use a 5v HV UBEC at the RPI end.

Can anyone see any issues with these units?

Thanks
Fady

[ant_thomas]

Hi All,

I plan to use RPI's as either Openelec Media Centers or DLNA control points around the house, (7 units for now). I have been thinking about the cleanest solution and this obviously involves POE. I have an 8 port POE switch witch would be perfect and I intend to use a 5v HV UBEC at the RPI end.

Can anyone see any issues with these units?

Thanks
Fady

You've certainly picked a substantial UBEC!

I'm currently using UBECs at the RPis end to power them via POE and they work fine. As long as your loss calculations for the length of cable and the amount of pairs you're using (1 or 2 pairs) puts you within the UBEC range of 14V-42.5V from the POE switch output voltage you should be fine.

I'm using a 24V 500mA power supply over 50M Cat5e using 2 pairs with a 5.5V to 23V UBEC.

[fady]

Thanks ant_thomas,

I chose that particular UBEC because there would be only be short runs, max being about 15m, the switch outputs 48v, so I was hoping that this UBEC (rated 14v - 42.5v) could handle the ~47v that will be hitting it. For $12, I will get one and see how it handles the higher input.

Fady

[3.14_in_the_sky]

Was your UBEC able to handle the 47v? I'm looking to do something very similar.

Thanks!

[fady]

Was your UBEC able to handle the 47v? I'm looking to do something very similar.

Thanks!

G'day 3.14_in_the_sky,

I ended up going with these..

http://www.tp-link.com.au/products/deta ... OE10R#spec

These will output 5v 2A, which is plenty, and are really cheap, found power cables for a few bucks on ebay aswell.

So, for not much more than the cost of a UBEC plus bits, I got an out of box solution.

Cheers,
Fady