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From: root@zswamp.uucp (Geoffrey Welsh)
Newsgroups: comp.dcom.modems
Subject: Re: "Loud Carrier"?!? (was Re: Telebit vs. Intel)
Message-ID: <108.2843277E@zswamp.uucp>
Date: 28 May 91 13:50:15 GMT
Organization: Izot's Swamp BBS (FidoNet), Kitchener, Ontario
Lines: 27

In a letter to All, Steve Fenwick (steve@pro-hindugods.cts.com ) wrote:

 >What _is the advantage of a louder carrier?

   If we assume that the noise level on a line is fairly constant (or, at 
least, determined as soon as you complete your dialling), a louder carrier 
gives you a higher signal/noise ratio and therefore, theoretically, a cleaner 
data link.

   There is also merit to the argument that a higher peak-peak amplitude 
results in more precise reproduction of the carrier over pulse-coded 
modulation ("PCM", read: digitized) trunk lines used for long distance and 
even some local hops.

   Of course, this becomes invalid if the volume is so high that it causes 
distortion.

   Manufacturers set their levels as high as they can without significantly 
increasing the number of connections that will fail because of volume-induced 
distortion.
 

--  
Geoffrey Welsh - Operator, Izot's Swamp BBS (FidoNet 1:221/171)
root@zswamp.uucp or ..uunet!watmath!xenitec!zswamp!root
602-66 Mooregate Crescent, Kitchener, ON, N2M 5E6 Canada (519)741-9553
"He who claims to know everything can't possibly know much" -me