[asterisk-ss7] At what interval should FISUs be sent?

[tian00di00 at live.com]

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 at knielsen-hq.org>
Sent: Thursday, July 02, 2009 2:58 PM
To: <asterisk-ss7 at lists.digium.com>
Subject: Re: [asterisk-ss7] 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.
>
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