----- Original Message ----- From: "David Gibbons" <[email protected]> To: "Asterisk Users Mailing List - Non-Commercial Discussion" <[email protected]> Sent: Thursday, July 22, 2010 1:58 PM Subject: Re: [asterisk-users] POE Splitters
> There is no such device -- it's outside of the POE spec. > > Class 3 devices are allowed to consume at max 15.4W. Most phones are class > 3 > devices. The math just doesn't work out. Even if you used the draft > standard > for class 4 (~30W), you could still power max 2 devices at 15W/ea. > > -Dave > > On Thu, Jul 22, 2010 at 2:46 PM, Matt <[email protected]> wrote: > >> I've got an interesting situation where I have one cable run from the >> feed >> area to the service area. I have three devices that I need to power at >> the >> service area. Is anyone aware of a device that will take the POE from >> the >> cable run and then allow me to split it to two or three devices at the >> service end? >> >> When I search for splitter all I get are the injectors, but I figure >> someone has to make something.... I realize I'll need a power adapter >> with >> enough amps to power the full load at the end. >> You could do someting with passive POE--in other words not 802.2af POE, but rather the 'dumb' kind of POE which just injects power on the unused pairs. Passive POE (being passive) does not have a hard wattage limit per drop limitation imposed by 802.2af. On the far end, you could split out the power to run a 4-port 802.11af POE switch. Passive POE would preclude GigE, but at least you wouldn't have to add ethernet drops. In theory you could preserve GigE by looking for a IEEE 802.3at [sic] switch. IEEE 802.3at allows 36 watts per port, but good luck finding (or affording) a 802.3at-powered 3-port 802.2af POE switch even if all 3 downstream devices don't draw the maximum wattage simultaneously :-) -Karl -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
