Please use the following principles:
- If you have 1/2 PoE device you are better off buying PoE/PoE+ injector and connect them to your router or LAN switch (least cost and manageable cable mess)
- If you have 3/4 PoE device, it is better you buy an 8-Port PoE switch with 4 PoE Ports and 4 non-PoE ports. Please make sure of switch data speed (100 mbps/1000 mbps) matching
- If you have more than 4 PoE devices or are planning to have them soon, please go ahead an buy an 8-port PoE/PoE+ switch. They are expensive starting Rs. 7000 (Digisol) to about Rs. 16000 (Cisco) based on brand
- If you are in greenfield mode and setting everything up, you can try to buy a switch that has 4 PoE ports and 4-20 standard Ethernet ports.
Their is also the Midspan injector device,. You should buy that (its a little hard to find in market in India) if you need a lot of PoE/PoE+ ports and already have an existing investment in a large capacity non-PoE LAN switch
PoE (802.3af) is expensive and you pay for the simplicity of having only one wire carry both data and DC power. If PoE was not there you have the additional headache of providing power point near to device mount location or running a 2 pair electrical wire safely to that location. what's worse is that PoE+ (802.3at) is rarer.
WARNING: A lot of PoE devices are not compliant to 802.3af or 802.3 at. So while buying the device make sure the device and injector/switch are supporting same power standard. Very frequently when good brands go for deviations (Ubiquity/Cisco) from 802.3af/at, they also supply their power injectors along with the device. Make sure yoiu use them and not plug them into a PoE/PoE+ switch/injector.midspan.
- Suman Kumar Luthra @ APRC-P3 Telecom Sub-Committee
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