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

[Gustavo Marsico [Gmail]]

It's talking about Japan:

Note: In the ITU-T Japan variant, signaling link quality is checked by the
continuous transmission of flag octets (8-bit bytes) rather than FISUs;
FISUs are sent only at predefined timer intervals (e.g., once every 150
milliseconds).

If you live in Japan can make sense that, but in ITU world it's just like as
Kristian's said.

Regards,
 
Gustavo
Buenos Aires, AR


On 7/3/09 1:06 AM, "tian00di00 at live.com" <tian00di00 at live.com> wrote:

> 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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