Grandstream, Linksys and all other IP phones I've seen so far use very little electricity, about 5VDC. When I first saw Aastra, first thing I couldn't understand was why it had a 48VDC adapter. So my question is, why Aastra uses so much more electricity, about 10 times more than Grandstream and Linksys. If there are 50 Aastra phones in an office, they're paying a good extra for electricity. Why is that?
I'm not a hardware engineer, but my guess is so that is the same as the Power over ethernet standard. Therefore the phones support power over ethernet at a very affordable price :-D
However, I think you may be confused regarding the power consumption versus power supply voltage. The higher voltage does not equate to higher power usage.
Correct with the power usage, that is not defined by volts alone but rather v/a=p. Essentially its a combination of volts AND amps, that gives you WATTS. Using the watts you could determine power consumption level to other devices. Additionally, even though the power supply is rated for, ex. 500mA, the device may only draw 300mA.
But most likely, they prolly use about the same power.
JamesDW wrote:
Isnt't it P=I*VI=Current
V=Volts
P=Power
Correct James.
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