Date: Thu, 01 Oct 1998 23:36:23 +1000 From: "Hallam Oaks P/L list account" <mlnn4@oaks.com.au> To: "freebsd-isdn@FreeBSD.ORG" <freebsd-isdn@FreeBSD.ORG> Cc: "Andrew Gordon" <arg@arg1.demon.co.uk> Subject: Re: HSCX query Message-ID: <199810011335.XAA27382@mail.aussie.org>
next in thread | raw e-mail | index | archive | help
>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. [Note that in my original message I said 'PCI ISAC', but this was a typo; I meant PCI ASIC. It does the PCI glue functions and also implements the D channel decoding etc. The ISAC is an ordinary Siemens PSB2186.] As there's a Linux driver for this card in existance the FreeBSD version should not (I hope) be a major problem to get working, but I am stepping carefully as I am not an experienced Unix device driver type person. -- Chris To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isdn" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199810011335.XAA27382>