[asterisk-users] Issues with dahdi show status output (and check IRQs)

[Olivier]

2011/12/10 giovanni.v <iax at keybits.org>

> Il 10/12/2011 8.03, Olivier ha scritto:
>
>  Yes, assuming no hardware/configuration problems this shouldn't happen
>>> >  on PTP.
>>>
>>
>  Can you explain why taking down layer 1 on idling spans happens on
>> PtmP and can't happen on PTP ?
>>
>
> Where possible worse than my English:

"ne devrait pas arriver", "généralement pas utilisés".
>

In french, everything becomes crystal clear, isn't it ? ;-)))))))))

Ok, i'd like to be sure my statement above will never misunderstood. I
> wanted to say that L1 deactivation in PTP provisioning is not commonly used.
> However, nothing prevents the telco to do so because (ETSI*)
> specifications allow it. The ETSI L1 specification says that "The choice to
> eventually deactivate is up to higher layers at the network side." without
> any distinction between PTP or PTMP.
>
> I believe that the L1 deactivation in PTP is not commonly used for the
> sake of convenience:
> - PTP lines are usually provisioned for a pbx using a basic NT (no a/b
> ports, less power). A pbx doesn't drain power from the network so there is
> little to save.
> - PTP lines are also provisioned to share a single number or DDI spans to
> multiple BRI. The result of permanent L1 and a fixed TEI is a faster
> response from the user side, that is convenient on the network side to find
> and allocate a resource on incoming calls.
>
> * ETS 300 012-1: http://tinyurl.com/bwycqcz
>
>
Thank you very much for this lengthy and very valuable explaination.

Comparing PTP and PTMP logs, I saw the former didn't include those lines
meaning the trunk is loosing its sync but I didn't know where it came from
(asking this kind of question to a Telco is like asking secret services to
list the names and addresses of their field agents ...).

Having Asterisk, Dahdi or whatever to support this BRI economy mode would
perfect (I would be pleased to contribute to a bounty targeting this
feature) but until this happens, switching to PTP seems the best option.

Tanks again for taking time to provide this input.



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