Date: Wed, 20 Mar 1996 06:55:30 +0000 From: Poul-Henning Kamp <phk@critter.tfs.com> To: "Jordan K. Hubbard" <jkh@time.cdrom.com> Cc: Greg Lehey <lehey.pad@sni.de>, hackers@FreeBSD.org (FreeBSD hackers), isdn@muc.ditec.de (Distribution List; FreeBSD ISDN) Subject: Re: ISDN: "modem" or board? (Was: Microsoft "Get ISDN"?) Message-ID: <11362.827304930@critter.tfs.com> In-Reply-To: Your message of "Tue, 19 Mar 1996 19:29:43 PST." <3349.827292583@time.cdrom.com>
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> > Watch my lips. A B channel gives you 64,000 bits per second. When you > > add one start bit and one stop bit for every 8 bits, you end up with > > 80,000 bits. Bind two such channels together and you have 160,000 > > Your lips don't make any sense.. :-) You SUBTRACT the start bit and > stop bit, you don't ADD it dude! Actually, you can subtract them in some cases. My Zyxel 2864I ISDN-gadgets can speak async HDLC on the serial port and sync hdlc on the ISDN. I've tried it out and can confirm that "64000 < one B-chan < 80000". My figures indicated 75000 bits/sec for FTP. The principle is not entirely unlike the various UUCP/XMODEM/KERMIT spoofing done by other brands of modems. -- Poul-Henning Kamp | phk@FreeBSD.ORG FreeBSD Core-team. http://www.freebsd.org/~phk | phk@login.dknet.dk Private mailbox. whois: [PHK] | phk@ref.tfs.com TRW Financial Systems, Inc. Future will arrive by its own means, progress not so.
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