[SI-LIST] Re: -48v

Santosh,
-48V is the common central office battery voltage, which is usually closer 
to -52V at the source.  Some rural offices run even higher voltages.  It's 
all about power loss in those long lines to the subscriber.

Steve.
At 11:17 AM 3/24/2004 +0530, Santhosh E P wrote:
>hi all...
>is there any specific requirement of having -48v for telephone lines. if
>then whats the advantage? why we can't have other voltages to carry the
>signal, not even +ve?
>regards
>santhosh
>
>
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Steve Weir
Teraspeed Consulting Group LLC
2926 SE Yamhill St.
Portland, OR 97214
(503) 239-5536
http://www.teraspeed.com
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