<br><br><div><span class="gmail_quote">2006/3/30, Don Pobanz <<a href="mailto:asterisk@hastingsutilities.com">asterisk@hastingsutilities.com</a>>:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Adolfo R. Brandes wrote:<br>> Lee Howard wrote:<br>>> However, based on the comments you give I'd suspect that you're having<br>>> what people seem to be calling "frame slipping". There seem to be
<br>>> some motherboards that react poorly with Zap cards (or their<br>>> respective drivers) and cause that. Your zttest results should be<br>>> revealing here.<br><br>Frame slips are NOT motherboard related!
<br><br>A Frame slip is due to clocks at opposite ends of a circuit such as a T1<br>running at different speeds. Either a buffer overflows and one frame is<br>thrown away or there is no data when a frame is needed so the previous
<br>frame is repeated.<br><br>The solution is to have one end of the circuit supply the clock and the<br>other end derive the clock from the incoming signal.<br><br>Don Pobanz</blockquote><div><br>How would you check clocks speeds at opposite ends of a circuit (T1, E1, BRI, ...) ?
<br><br>As it seems frame slips occur from time to time (for instance, on 10% of received faxes), do you imply that Asterisk settings should be changed so that on every fax received, it should adopt opposite clock speed (unlike today where by chance, 90% of circuit clock speeds are the same) ?
<br><br>Regards<br></div><br></div><br>Olivier