Re: ISDN and Frame Rates

Mark Wilson (
Mon, 15 May 1995 19:10:43 -0500

I'm tired of seeing these PC people bitch about throughput. The biggest
problem with CUSEEME and IPhone is that people haven't optimized their
Trumpet settings. Most people are using the default MTU of 1500. Way too
high. That is why most of you get the can't connect message. Get the Winsock
FAQ and maybe an RFC or two. You can easily get 4 fps or higher with a 28.8.

>I think CUSM is a terrific program and appreciate the work of the
>development team and its supporters very much. So much so that this is the
>only list that I read faithfully. However, at 28.8 (115,200) especially with
>no sound it is a joke. I regularly experience 0-1 FPS and sometimes the
>images don't bother to show up. I realize this is a bandwidth situation but
>what is the solution for people who want better performance?
>Is it feasible to operate on an inexpensive 56K line? What kind of frame
>rates can I expect? I can get ISDN for $57.00 per month and installation
>starting at $200.00 (2 64Kbits "B" channels and a "D" channel for signaling
>for 128-kbps performance). What frame rates can I expect using an ISDN
>internet connection to these lines. I just found a high end digital modem
>for $749.00 from ZyXel (Computer Reseller News, May 8th, 1995). It includes
>an NT-1 interface. Am I correct in assuming that the people who actually
>enjoy the NASA feed and other on line productions are using such
>connections? It seems to me that with appropriate frame rates and
>synchronized sound CUSM is an absolute GOLD MINE for information and people
>to people communication around the world!
>Thanks for reading,
>Don Johnson
>Orlando, Fl USA Go Magic!!