Date: Thu, 1 Oct 1998 15:45:48 +0200 From: Ignatios Souvatzis <ignatios@theory.cs.uni-bonn.de> To: Hallam Oaks P/L list account <mlnn4@oaks.com.au>, "freebsd-isdn@FreeBSD.ORG" <freebsd-isdn@FreeBSD.ORG> Cc: Andrew Gordon <arg@arg1.demon.co.uk> Subject: Re: HSCX query Message-ID: <19981001154548.C24738@cs.uni-bonn.de> In-Reply-To: <199810011335.XAA27382@mail.aussie.org>; from Hallam Oaks P/L list account on Thu, Oct 01, 1998 at 11:36:23PM %2B1000 References: <199810011335.XAA27382@mail.aussie.org>
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On Thu, Oct 01, 1998 at 11:36:23PM +1000, Hallam Oaks P/L list account wrote: > >software would use a lot of CPU. If there is hardware HDLC for the B > >channels but not for the D channel, that would require just the same > >development effort but would have a much less serious impact on > >performance since the average data rate on the D channel is extremely > >low. > > It may seem to unbelievable (but it's true) that it's the opposite way. > There is hardware support for decoding the D channel but not for the B > channels. As far as the software is concerned, the ASIC is transparent > for the B's in that it just passes through whatever it receives from the > ISAC. This makes sort of sense. You _need_ HDLC for the D-channel protocols. You only need HDLC for B-channels, if you use HDLC-base protocols. Voice data are transmitted raw, so you don't need HDLC necessarily. Its probably a board for people who want to implement DM 200 functionality on a DM 2000 machine ;-) -is To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isdn" in the body of the message
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