Date: Wed, 14 Aug 1996 11:44:54 -0500 (CDT) From: Jacob Suter <jsuter@bsd.intrastar.net> To: Global Internet Shopping Mall <gism@isot.isot.com> Cc: freebsd-isp@freebsd.org Subject: Re: Share T1 voice/data? Message-ID: <Pine.BSF.3.91.960814113548.10962A-100000@bsd.intrastar.net> In-Reply-To: <199608140854.DAA11322@isot.isot.com>
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On Wed, 14 Aug 1996, Global Internet Shopping Mall wrote: > Can the T1 be shared for both data and telephone voice line? Yes... If your telco is so kind as to tell digital service by the DS0.. Basically what they do is configure "DS0-1 = 56/64, DS0-2 = Voice grade, etc etc"... There are a couple problems with this scenario. what happens in the telco office is that there is a cable (resembling a good 'ol RJ-45 4-wire) jumping from their equipment to the channel bank to be used to deliver the voice/data service. On the data it doesn't much matter, maybe an additional ms or two of lag, on the other hand the voice quality goes DOWN hard. because the timing on the D/A converters on the channel bank will never be really synched with the A/D converters on the switch (and vise versa) you loose a lot of your top-end sound quality, which means your top connection speed is NOT going to be 28.8k, but about 24.0K. Unluckily at the moment I am living this nightmare. there are ways around it for the telco, which are in reality cheaper and a whole lot better than this, but GTE (my telco) is too stupid to figure out how to do it (basically elimination of the D/A-A/D conversions at the CO, direct wiring digital service from the switch to the channel bank). I hope this has helped. Good luck, JS
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