[asterisk-users] Why Aastra uses 48V whereas other IP Phones use much less, i.e. 5-12V

[Michael Graves]

The amount of electricity used is constant. When run from 48v DC power they draw less current (mA)...power (w) is constant. Devices run from 5 V DC likely draw more current (mA). Power = 
Voltage x Current.

Michael

--Original Message Text---
From: Zeeshan Zakaria
Date: Wed, 22 Nov 2006 21:29:46 -0500

Does it effect the performance/voice quality? Does this also mean that 48VDC is using less electricity in an office than 5VDC IP Phones?



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