Date: Thu, 23 Jan 1997 13:04:54 -0600 From: Allen Hyer <allenh@wtrt.net> To: Brett_Glass@infoworld.com, John-Mark Gurney <gurney_j@resnet.uoregon.edu>, lenc@earth.infinetconsulting.com Cc: spork@super-g.com, batie@agora.rdrop.com, drussell@internode.net, freebsd-isp@freebsd.org, freebsd-hardware@freebsd.org Subject: Re: 56K vs X2? Message-ID: <3.0.1.32.19970123130454.00b21cb0@wtrt.net>
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At 09:40 AM 1/23/97 PST, Brett_Glass@infoworld.com wrote: >> basicly there isn't signal loss when you go from digital to analog... >> there is only loss when you go from analog to digital... > >Not true; there's distortion, introduced by encoding, in either direction. >Not to mention bit robbing. That would normally be true. I can only speak from what I have read about X2, really haven't studied Lucent's 56k. T1's use PCM codes to carry data. USR's digital X2 modems signal the direct PCM codes, so there is no conversion in the server side originated data until it hits the local loop on the customer's phone line. And, since the originating data was straight PCM codes, the digital to analog conversion should theoretically not change the data. Allen Hyer System Administrator West Texas Rural Telephone
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