Date: Sun, 7 Apr 1996 01:08:03 -0800 (PST) From: Brian <brian@MediaCity.com> To: angio@shell.aros.net (Dave Andersen) Cc: questions@freebsd.org Subject: Re: ISDN TAs Message-ID: <199604070908.BAA03089@MediaCity.com> In-Reply-To: <199604062034.NAA03383@shell.aros.net> from Dave Andersen at "Apr 6, 96 01:34:16 pm"
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Dave Andersen wrote: > I've noticed a fair amount of complaining about the BitSurfrs lately, > and I'm wondering what people feel overall is the best coice for an ISDN > adapter, preferably external, for use under FreeBSD. This would be for > "home office" use (the FreeBSD box is acting as a router for a small > network here) connecting to my real office which is using Portmasters > with the 5bri expansion port. When you talk async over a serial port to an ISDN TA at 115200 baud, each byte you send is surrounded by two bits as part of the async protocol. Which means the real maximum data delivery rate to your TA is around 90000 bits per second. A rather poor usage of a 2B channel call, which can handle 112000 or 128000 bps. The only serial based ISDN TA I know of which goes faster than 115200 baud is the Adtran Express XRT or XR which can do 230400 baud. You'll need an appropriate serial card to go at that rate. For non-serial based ISDN routers the Ascend 25 and 50 seem pretty cool. -- Brian Litzinger Powered by FreeBSD <brian@mediacity.com> http[s]://www.mpress.com
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