48VDC is a long time telco standard - and has become the Power over Ethernet standard. Keep in mind that 'electricity' isn't the measure - it's power. Power is not synonymous with voltage. The formula V=IR (voltage equals current time resistance) points to a higher voltage allowing lower current draw on the line (with the same resistance). Think of the small gauge wires in CAT 5 cable; higher voltage allows the thin cables. This has nothing to do with voice quality. MD
_____ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Zeeshan Zakaria Sent: Wednesday, November 22, 2006 9:30 PM To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: Re: [asterisk-users] Why Aastra uses 48V whereas other IP Phones usemuch less, i.e. 5-12V 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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