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From: dbb@aicchi.UUCP (Burch)
Newsgroups: net.sci
Subject: Re: Choice of voltage?
Message-ID: <708@aicchi.UUCP>
Date: Thu, 6-Mar-86 22:09:06 EST
Article-I.D.: aicchi.708
Posted: Thu Mar  6 22:09:06 1986
Date-Received: Sun, 9-Mar-86 08:29:23 EST
References: <107@drutx.UUCP>
Reply-To: dbb@aicchi.UUCP (Burch)
Organization: Analysts International Corp; Chicago Branch
Lines: 17
Keywords: Telephony Batteries
Summary: 


Well, Four 12 Volt Lead-Acid Batteries in series will produce 48 volts.
I gather that in the old days, all power for telephony came from big
battery rooms, and 48 volts worked out both to be an even number of
standard (1.5 V) cells, and to be strong enough to drive the speaking
circuit for a good distance.  When the Ring current is applied to Loop
Start or Ground Start lines, it is still referred to by some as the
"battery".
 


-- 
-David B. (Ben) Burch
 Analyst's International Corp.
 Chicago Branch (ihnp4!aicchi!dbb)

"Argue for your limitations, and they are yours"