Date: Fri, 5 Sep 1997 15:55:28 -0400 (EDT) From: Stefan Molnar <stefan@exis.net> To: Edwin Culp <eculp@mexcom.net> Cc: Felipe Rivera Marquez <felipe@informador.com.mx>, isp@FreeBSD.ORG Subject: Re: what does an isp has to have to offer 56k access??? Message-ID: <Pine.LNX.3.95.970905154538.19358A-100000@sailfish.exis.net> In-Reply-To: <34105A95.1629FBA9@mexcom.net>
next in thread | previous in thread | raw e-mail | index | archive | help
> > Recentrly i talked with a friend (he also reads this list) about > > what is needed to offer 56k access... he says that only the 56k modems > > nothing else... but for what i know you need something with a digital > > interface to a E1 that talks to your modem modules... (like an ascend term > > server or something like that). > > > > What is the truth??? :) > That is the issue that I have been trying to understand and feel that > the > 56k (recieve only) modems are possibly a slight improvement over the > 28,800 > ( Tech quality ) nothing else. I still don't understand how to transmit > over > analog lines at 56K for these modems to recieve. > > > > I guess that a lot of isp's don't want to waste their investment > > on multiport cards or cisco routers.... any lights on this??? What you need is a PRI (Primary Rate Interface) for the term servers. Plan on waiting for the phone company to figure out on how to crimp the RJ-45 connector for the PRI. Then you need a Term Server that takes PRI lines, and have some sort of 56k style on DSPs and firmware. To reach the 56k (or something like it), The majorty of the public switched network (mr phone network) is digital, but what comes to a clients is standard analog lines. So when you call up it goes like this. modem (A)-----(D)Phone Network(D)-------(A)Provider. BUt with the the 56k stuff it is a lil diffrent: modem(a)------(d)Phone Network(d)-------(d)provider. See on how there isn't that 2nd A/D conversion. That alows more signal to go across the line and not be taken up by the A/D conversion. But it only works down stream. Stefan
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.LNX.3.95.970905154538.19358A-100000>