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SRW2024P Phantom Power

Linksys, Netgear, ect. Webbase configurations for switches or layer 2 devices.

SRW2024P Phantom Power

Postby Guest » Wed Oct 27, 2010 10:10 am

Do you know if this switch is capable on providing PoE over data lines i.e. phantom power, so that a 1000Base-T device can be powered up with PoE?

I cannot find any such information on the manual or the net.

 

I am going to buy a Routerboard 600 (http://www.routerboard.com/pricelist.php?showProduct=55) that supports 1000Base-T and PoE at the same time, and I would like to check if the switch supports it too.

 

Thanks.

Guest
 

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Re:SRW2024P Phantom Power

Postby Guest » Wed Oct 27, 2010 11:04 am

The SRW2024P provides 24-10/100/1000 ports as well as 802.3af compliant Power over Ethernet (PoE).  It will provide 7.5W of PoE per port on all 24 or the 802.3af maximum of 15.4W on 12 ports simultaneously.  If this is what you mean by "phantom power" then you should have what you need.  Ive personally only encountered that term with audio devices like say a microphone that needs "phantom" power, but I guess the concept is the same.  This information is contained in the Data Sheet here.

 

Hope this helps!

 

Glenn

Guest
 

Re:SRW2024P Phantom Power

Postby Guest » Wed Oct 27, 2010 11:05 am

Thanks for the answer.

 

Check this in wikipedia (http://en.wikipedia.org/wiki/802.3af):

 

Power over Ethernet is usually implemented following the specifications in IEEE std. 802.3af-2003 which added clause 33 to the IEEE 802.3 standard. It allows the powering device to use a voltage between 44–57 V DC, though the nominal voltage is 48 V, over two of the four available pairs on a Cat. 3/Cat. 5e cable with a selectable current of 10–350 mA subject to a maximum load power of 15.40 W. Only about 12.95 W are available after counting cable losses, and most switched power supplies will lose another 10–25% of the available power. A "phantom power" technique is used to allow the powered pairs to also carry data. This permits its use not only with 10BASE-T and 100BASE-TX, which use only two of the four pairs in the cable, but also with 1000BASE-T (gigabit Ethernet), which uses all four pairs for data transmission.

 

In other words, I want to provide power to a device while having a gigabit speed with it. This is also called "power over datalines". Do you know if SRW2024P support it? The datasheet does not nention it, and I don know if this is a 802.3.af feature.

 

Thanks.

Guest
 

Re:SRW2024P Phantom Power

Postby Guest » Wed Oct 27, 2010 12:24 pm

Costa,

 

802.3af is the standard that will allow you to push PoE over full duplex gigabit Ethernet. Excellent question and good research on you part.

 

The SRW2024P does not appear to fully support 802.3af according to the data sheet unlike the SGE2010P for instance. 802.3af is either listed under standards, or it is not.

 

Thank you,

Christopher

Guest
 

Re:SRW2024P Phantom Power

Postby Guest » Wed Oct 27, 2010 1:16 pm

Thanks.

 

So, you are suggesting that, most proabably, SRW2024P will fail to provide PoE and gigabit speed on the same port.

Is that right?

 

This is important for me, since I am going to buy the specific routerboard just because it can be powered by PoE and have a gigabit speed at the same time.

If it is not going to work on the switch, Ill buy something completely different.

 

Thanks again.

Guest
 



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