Thank you Kristian, But Q.703 does not clearly specify that FISUs should be sent when there is no other signal unit available for sending. I searched the document and failed to spot such statements or similar ones. The SS7 tutorial from Performance Technology states that: "FISUs are sent only at predefined timer intervals (e.g., once every 150 milliseconds)." Please check it at: http://pt.com/page/tutorials/ss7-tutorial/mtp Refer to the last sentence of the first paragraph under the first figure. -------------------------------------------------- From: "Kristian Nielsen" <knielsen@xxxxxxxxxxxxxxx> Sent: Thursday, July 02, 2009 2:58 PM To: <asterisk-ss7 at lists.digium.com> Subject: Re: At what interval should FISUs be sent? > <tian00di00 at live.com> writes: > >> I am reading libss7 source code recently, it seems that libss7 sends >> FISUs >> at the full speed it can reach. Is it the correct way to do this? >> >> Is there any timer specified by the standard at which FISUs should be >> sent? > > As I understand your question and remember the standard, this is correct. > > FISU (fill-in signalling unit) should be sent when there is no other > signal > unit available for sending. So the ss7 link is never "idle", which is a > difference to how ISDN work I think. > > This is covered in the Q.703 document. > > - Kristian. > > _______________________________________________ > --Bandwidth and Colocation Provided by http://www.api-digital.com-- > > asterisk-ss7 mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-ss7 >
|