[VoIP] Dial Pulse converter specifications

[Steph Kerman]

No.  It does not prevent dial pulses from reaching the TT device or 
line.  Some ATAs see each dial pulse as a disconnect and reseizure.

If the ATA recognized DP correctly, a potential cause of double dialing, 
you would not need the converter.

SK

Nathaniel D. Watson wrote:
> I do not own one, so I do not know much about it, but would one of the
> converters sold by Mike Sandman not serve this purpose? (Provided that the
> ATA strictly requires TT dialing, otherwise you'd end up with double-dialing
> of each digit). His catalog number for the device is: CID6K.
>
> Nathan
>
>
>
>
> on 1/3/07 9:40 AM, Steph Kerman at stfkerman at jps.net wrote:
>
>   
>> More loop supervision?  What do you mean?
>>
>> 1)  It needs to connect into the loop.  A design was published that
>> installed in a phone and connected directly to the dial pulse contacts.
>> This is not a suitable configuration.
>>
>> 2)  It needs to provide a DC current path during the dial pulse break
>> intervals to prevent the downstream device from seeing each pulse as a
>> disconnect. 
>>
>> 3)  It should support 10 PPS to 20 PPS operation.  20 PPS operation is
>> not supported on some modern exchanges that support 10 PPS operation.
>> Supporting 20 PPS operation would make it possible to use 20 PPS dials
>> both in these environments and in SXS environments equipped with TT
>> converters.
>>
>> 4)  It should work with real-world dial pulses that have pulse
>> characteristics at the extremes of the readjustment limits published by
>> the Bell System.  This includes ratio, average and instantaneous speed
>> and contact bounce.
>>
>> 5)  A goal would be to make it loop powered, but that's not an absolute
>> necessity.  It could be designed to only consume power during pulse
>> conversion, so that battery operation could be achieved with very long
>> battery life.
>>
>> 6)  It should use readily available commercial electronic components: no
>> antique switching equipment relays with pure unobtainium contacts.
>>
>> 7)  A printed circuit board would be designed and procured from a
>> commercial prototype board house to permit easy assembly without random
>> hand wiring.
>>
>> Steph
>>
>> john jones wrote:
>>     
>>> Since so many VoIP ATA's don't support DP dialing,
>>> there has been a suggestion to construct a TT to DP
>>> converter.
>>>
>>> I'd like to start collecting specifications of what
>>> this device needs to do.
>>>
>>> I expect that on the FXS side, it ought to perform in
>>> ways similar to the teltone converters often installed
>>> between Linefinders and the 1st selector although I
>>> imagine that more loop supervision is required.
>>>
>>> Let's get a dialog going on this.
>>>
>>> Thanks!
>>>
>>> John
>>>   
>>>       
>
>
>
>
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