802.3af Power Over Ethernet on the cheap

Summary:Anyone interested in IP Telephony or remote video cameras that draw power over an Ethernet cable has to be interested in some cheap 802.3af PoE (Power Over Ethernet) gear.

Anyone interested in IP Telephony or remote video cameras that draw power over an Ethernet cable has to be interested in some cheap 802.3af PoE (Power Over Ethernet) gear.  Well I found just the thing with this AirLink 8 port 10/100 Ethernet switch with 4 802.3af PoE ports on sale for $30.  The device normally sells for about $60 which is still a relatively cheap way to get 4 PoE ports any way you look at it.  Here's what it looks like unboxed below.

AirLink 8 port 10/100 Ethernet switch with 4 802.3af PoE ports

You'll notice that it has a full PC style power connector which is unusual for an Ethernet switch of this size.  This is because each 802.3af standard PoE port theoretically draws a peak load of 15.4 watts which means the four PoE ports alone can draw 61.6 watts and the switch itself probably draws another 5 watts or so.  With 4 PoE ports, that means we can plug in 4 IP Phones which are getting amazingly cheap these days ($80 to $200) and the newer ones can even support wideband audio CODECs.  You can use the other 4 ports for uplinking, troubleshooting, or the small Asterisk PBX appliance.

You can't do advanced functions like VLAN separation on a cheap switch like this to separate your Voice devices from your data network but you can simply not connect this to your data network and use true physical separation between Voice and Data.  Even if you implement all the Layer 2 security lockdowns there is nothing like the reliability and simplicity of an air-gap between your data network and your voice network.  Although this does require you to run one set of cables for voice and one for data, switches that support data and voice on the same port cost 10 to 20 times more money so it still works out to be less money and you have the piece of mind of having physically separate infrastructure.  For small offices and even retail chains a device like this is the perfect solution.  At this price, you could forget about the support contracts and just get a spare switch at each location.

I'll be doing more IP telephony experiments so this PoE switch is going to come in real handy.

Topics: Networking

About

George Ou, a former ZDNet blogger, is an IT consultant specializing in Servers, Microsoft, Cisco, Switches, Routers, Firewalls, IDS, VPN, Wireless LAN, Security, and IT infrastructure and architecture.

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