Date: Wed, 20 Mar 1996 00:06:54 -0800 From: "Jordan K. Hubbard" <jkh@time.cdrom.com> To: Terry Lambert <terry@lambert.org> Cc: lehey.pad@sni.de, hackers@FreeBSD.ORG, isdn@muc.ditec.de Subject: Re: ISDN: "modem" or board? (Was: Microsoft "Get ISDN"?) Message-ID: <4383.827309214@time.cdrom.com> In-Reply-To: Your message of "Tue, 19 Mar 1996 13:05:51 MST." <199603192005.NAA24618@phaeton.artisoft.com>
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> > > 1. Speed of a connection. Some people say "the bottleneck is the B > > > channel, so you can use async instead". Well, yes, assuming your > > > machine isn't doing anything else. To run 2 B channels flat out, > > > you need a 230 kb/s line, which with standard el cheapo 16550As > > > > You, uh, would? 64+64 = 128Kb/s using my own calculator! :-) > > Hee hee. Think "allowable baud rates for serial ports". 8-). Oh, I know the limitations of that, I was just trying to figure out how Greg was managing to take 64+64 and get "230K" from it. I'm well aware that the next step from a 115.2K UART is 230.4Kbaud since they generally just double the previous value, but Greg's comments seemed to indicate that he was also ADDING the overhead rather than subtracting it and coming up with a wholly new bandwidth category for ISDN, which would be a neat trick and worth some money were it that easy.. :-) Jordan
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