[VoIP] Dial Pulse converter specifications

[Steph Kerman]

A circuit board would be designed to permit the circuit to be built up 
easily from component parts.  Designing around a Basic Stamp is a waste 
of money even for something that will only be built in the dozens.

Steph

kemartinatsnetnet wrote:
> Steph,
>
> So you are basically saying to create something like the Teltone 
> converters but from the ground up.
>
> What are you thinking about?  Something like a discrete DTMF chip or 
> build the DTMF front end ground up and control the unit by something 
> like a Parallax Basic Stamp chip (compiled basic or 'C') which should 
> be able to store the decoded DTMF and directly control a relay and do 
> the dial-pulsing. This could get complex if you have to take into 
> account incoming digit timing, how long to wait for additional 
> digits, loop supervision, forward disconnect, etc.  Plus the actual 
> hardware design.
>
> Would this need to meet current FCC connection requirements?
>
> Questions, questions.
>
> Ken
>
>
> --- In singingwires at yahoogroups.com, Steph Kerman <stfkerman at ...> 
> wrote:
>   
>> 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 ... 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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