Since a while I’ve been monitoring the power consumption of devices in my home using a power meter from BespaarBazaar.nl (advised by Remi). This power meter is a good one because it is very precise. It starts measuring at 0.2 Watt.
I needed an Ethernet switch to connect my TV, NMT and PS3 to my home network. While searching for a proper switch, I came across DLinkGreen.com. It looked promising. The Green Calculator, a 8.7MB Flash app which is using a lot of CPU (hello D-Link! is this Green?!? what about HTML5?), showed me I could save 70,98% of energy (2h, 1-5 ports > 28.7Wh D-Link Green vs. 99Wh Conventional per day) using D-Links Green technology.
I couldn’t find any green switches from other manufacturers so gave it a try. I bought a D-Link DGS-1005D. It’s a 5-ports unmanaged Gigabit Ehternet switch, supporting IEEE802.3az (Energy Efficient Ethernet), IEEE802.3x (Flow Control), 9000 bytes Jumbo Frames and IEEE802.1p QoS (4 queues).
So I did some tests using the power meter. As reference I used a HP Procurve 408 (8 ports 100Mbit switch).
HP Procurve 408
|Port #||1||2||3||4||5||…||Watt||24h||2h + 22h idle||kWh annually|
|Port #||1||2||3||4||5||Watt||24h||2h + 22h idle||kWh annually|
m = 100 Mbit, g = 1 Gbit
First of all it’s interesting to see that the power adapter from HP is using 1.4 watts on it’s own already. Besides that it’s nice to know that a 100Mbit port uses less energy than a Gigabit port. The Green Calculator is quiet right in my case. I’m saving about 72~74% of energy.