[VoIP] Motorola VT1005

[Steph Kerman]

You can change the ratio with less than that.  You can't change the 
average speed without enough relays to count all pulses of the digit and 
regenerate it after it is over.  So you would need at least 2 dial pulse 
counters: one to record the incoming digit and one to count the pulses 
of the digit being sent, overlapped with the next incoming digit.  
Otherwise you would need to store each digit. 

So you need 10 relays just to count the pulses and additional ones to 
follow pulses, send pulses, sequence control, interdigit timing, etc.  
Probably around 15 relays.  And this won't handle the case where the 
average incoming pulse speed is excessive, which would require storing 
at least some of the digits.  And then you have something that does not 
help all the ATAs that don't do DP at all and requires the dials to be 
adjusted to the correct average speed. 

Of course you could do the whole thing with a PIC.  But you still have 
something that does not help all the ATAs that don't do DP.

So now that you have thrown down the gauntlet, perhaps you want to pick 
it up...

SK

David Josephson wrote:
> Well then. The challenge then might be to build a dial speed/ratio 
> correcting device, and that could be done entirely with a few wire
> spring relays, wouldn't that sound interesting.
>
> Steph Kerman wrote:
>> John Novack wrote:
>>
>>> I have ordered a 1005 unlocked, so I will have more information in a
>>> couple of weeks on that. It certainly is usable, even if one has to
>>> get a given dial's spped into range.
>>>
>> Which may or may not actually be possible in practice, depending on how
>> fussy the 1005 is. #6 and later dials have excellent speed regulation
>> throughout run-down. #2, 4 and 5 dials slow down during run down. For
>> this reason it's possible that no adjustment can be found that will work
>> reliably with a DP device that is too finicky. 
>