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10/100 or Gigabit? Full power on all 16/24 ports?
Budget?
Also look at POE mid spans.. can be a lot cheaper then a POE switch.. and then you can still use a higher quality switch with it if needed.
Would you happen to know of any downsides with injectors?
Space and outlets usage.
A PoE switch makes it much easier and cleaner to power many PoE devices.
New or used preferred?
Also I need to again ask if you need power on all ports. Some budget switches will only have power on the first 10 ports, some will only power up to 280watts, etc. So if you tell us exactly how many PoE ports that you want we can find the appropriate switch.
http://www.newegg.com/Product/Product.aspx?Item=N82E16833156051
http://www.streakwave.com/itemdesc.asp?ic=ES-24-250W
Used Cisco WS-C3750-24PS-S from eBay.
New would be very nice. Again, just 10/100 (no gigabit needed), and yes power on all ports. Unmanaged as well, since the company providing our phones is handling all the backend stuff. We currently only have 14 phones but may be expanding to 30 in a year or so. The injectors would be hidden behind desks and never moved/unplugged, so I'm not too worried about clutter on that end.