Why -48V?

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haylin1217

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this is my homework..

One of my mentors asked me this question and yet, i haven't figured out the answer to this question..

Why is -48 V most preferred as a power supply for telecom and telephone lines? and why negative supply? What's the reason behind it?

Any suggestions?


thanks for any help..
 
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lol i will tell you why. At first i had pcbheaven etc etc etc with a link. Then i copy paste this (that i kinda like it) but the link stayed. It did not bother me. But hey you are right. I will fix it
 
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