Date: Tue, 6 Apr 1999 11:13:41 -0700 (PDT) From: Archie Cobbs <archie@whistle.com> To: jimshewmaker@calvarychapel.com Cc: freebsd-isdn@FreeBSD.ORG Subject: Re: more than 2 B channels Message-ID: <199904061813.LAA73828@bubba.whistle.com> In-Reply-To: <199904052055.OAA01287@pearly.csn.calvarychapel.com> from Jim Shewmaker at "Apr 5, 99 03:43:18 pm"
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Jim Shewmaker writes: > > > After glancing through RFC-1717, I still am unable to find any > > > information on using Multilink PPP to dynamically combine 2 to 4 > > > B channels at once. It appears that there may not be anything > > > limiting it at the CO, but I would prefer to set up my 3.1-RELEASE > > > machine to have one B channel on each async port. This way the > > > other use of our ISDN (live audio feeds for radio broadcast) can be > > > dropped individually and at any time without causing problems with > > > normal traffic. There would always be at least 1 B channel > > > available for Internet use (so that there is 0-3 B channels for audio > > > at any given time). > > > > What are you talking about when you say "one B channel on each > > async port"? Are you talking about using two terminal adapters? > > You can't have two different terminal adapters connected to the > > same ISDN line (unless they have S-interfaces and they're on the > > same S-bus). > > > > If you have two ISDN lines and two terminal adapters, then with > > the observation that terminal adapters look just like modems, all > > you need to do (I think) is set up two-channel multi-link PPP over > > your two async ports. > > Actually, I mean using up to 4 TAs, so that each TA has its own B > channel. That way our application that may need more than one B > channel at a time for audio will only take what it needs, not a B > channel more. Also, then I won't have to mess with synchronous > ports to get 128 K on the normal two B channels, since an async > port can go plenty fast to get 64K. I only read about using 2 at a > time, nothing with more than 2 B channels. So then just do multi-link PPP over your four COM ports. Multi-link works with any arbitrary number of links, not limited to just two. The TA's will each appear as one (modem) link. However, you won't necessarily be able to route specific traffic onto specific links without some hacking. -Archie ___________________________________________________________________________ Archie Cobbs * Whistle Communications, Inc. * http://www.whistle.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isdn" in the body of the message
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