On 17 Dec 96 at 8:33, Stephen Zedalis wrote:
> On Tue, 17 Dec 1996, Christian Gatti wrote:
>
> > How about USR-Courier-I modems (external ones) on a PM2?
> > Would it not be possible that these modems can do 33.6;
> > 56 and ISDN altogether on a PM2?
> >
> > They are connected via BRI, this means a digital connection.
>
> Yes, but within the Courier-I there is a A/D conversion from the BRI to
> the old Courier chipset. So, this may not work. In fact, I thought I
> heard a USR rep say the only USR setup that will work is the all
> digital Total Control racks. That even the ones with analog cards will
> not work.
Wrong. The "old Courier chipset" is a true DSP based modem, no
Rockwell sh*t other "modem" manufacturers use. Therefore, there is no
A/D conversion to the BRI interface, just a direct DSP link.
Therefore and due to the 56k theorems (see Shannon), the I-Modem is
able to serve as an X2 host.
Frank
-- Frank M. Heinzius MMS Communication GmbH frimp@mms.de Eiffestrasse 598 http://www.mms.de 20537 Hamburg, Germany Phone: +49 40 211105-0 Fax: +49 40 210 32 210