[VoIP] Motorola VT1005

[Steph Kerman]

Start by testing DP recognition with bounce-free pulses from a "perfect" 
contact generated by a 555 timer or other electronic source driving a 
solid state relay or mercury wetted contact relay.  Connect this to the 
line through a 425B network with no ringer connected.  

See what ranges of ratio and speed are recognized properly. If that 
looks okay, add impairments in the form REN 1 to 5 to see if REN skews 
the ratio and speed recognition ranges.  If this all looks okay we will 
figure out a way to simulate contact bounce.

The results must conform to a reasonable facsimile of the range shown in 
BSPs.  I will research these pass/fail speed and ratio requirements.  We 
don't need to know that now to characterize the ATA.

Steph

john jones wrote:
> Yeah,
>
> So how do we do that?  Otherwise, we're just sending
> emails back and forth about what might happen. It
> seems to me that we need/want to have a method to
> characterize whether a solution, be it PIC, WS relay,
> ATA, channel-bank or bubble-gum actually works well. 
> Your point is valid.  Different products behave
> differently.  How do we pick good ones?
>
>
> John 
>
>  
> --- Steph Kerman <stfkerman at jps.net> wrote:
>
>   
>> Any test dial needs to be characterized or the
>> result is meaningless.  
>> You have to know in advance whether it SHOULD be
>> recognized properly or not.
>>
>> Steph
>>
>> john jones wrote:
>>     
>>> There are a bunch of setting for pps and
>>>       
>> make/break
>>     
>>> ratio so I suspect it would be pretty flexible. 
>>> However, the $64K question is, what is a good
>>>       
>> test.
>>     
>>> Folks could send me "bad" dials so I can
>>>       
>> experiment.
>>     
>>> John
>>>
>>>
>>> --- Steph Kerman <stfkerman at jps.net> wrote:
>>>
>>>   
>>>       
>>>> Seems reasonable to me for what it sounds like it
>>>> does.  Again... how 
>>>> "real world" is the DP detection?
>>>>
>>>> SK
>>>>
>>>> john jones wrote:
>>>>     
>>>>         
>>>>> Is the Cisco MC3810 too expensive (~$140) for 6
>>>>> ports)?
>>>>>
>>>>> Just wondering
>>>>>
>>>>> John
>>>>>
>>>>>
>>>>> --- Doug Alderdice <ka2wft at arrl.net> wrote:
>>>>>
>>>>>   
>>>>>       
>>>>>           
>>>>>> At 1/8/2007 01:56 PM -0500, Steph Kerman wrote:
>>>>>>     
>>>>>>         
>>>>>>             
>>>>>>> I'm still convinced that there is an
>>>>>>>               
>> application
>>     
>>>>>>>       
>>>>>>>           
>>>>>>>               
>>>>>> for a reliable DP/DTMF
>>>>>>     
>>>>>>         
>>>>>>             
>>>>>>> converter even though the "budget be damned",
>>>>>>>           
>>>>>>>               
>>>> "the
>>>>     
>>>>         
>>>>>>>       
>>>>>>>           
>>>>>>>               
>>>>>> more unnecessary
>>>>>>     
>>>>>>         
>>>>>>             
>>>>>>> trunks the merrier" T1 advocates are
>>>>>>>               
>> dismissive
>>     
>>>>>>>           
>>>>>>>               
>>>> of
>>>>     
>>>>         
>>>>>>>       
>>>>>>>           
>>>>>>>               
>>>>>> the idea.
>>>>>>
>>>>>> Indeed.  A bunch of T1 ports MIGHT be fun to
>>>>>>             
>> play
>>     
>>>>>> with if it weren't for 
>>>>>> the cost.  But the key word there is play.  I
>>>>>>             
>> am
>>     
>>>>>> just looking for a couple 
>>>>>> of reliable DP capable ports in and out to my
>>>>>>         
>>>>>>             
>>>> switch
>>>>     
>>>>         
>>>>>> with a minimum of 
>>>>>> boxes/pieces betwixt.
>>>>>>
>>>>>> D.
>>>>>>
>>>>>>
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>>>>>>
>>>>>>
>>>>>>     
>>>>>>         
>>>>>>             
>>>>> _______________________________________________
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>>>>>
>>>>>   
>>>>>       
>>>>>           
>>>> _______________________________________________
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>>>>
>>>>     
>>>>         
>>> _______________________________________________
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>>>   
>>>       
>> _______________________________________________
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>>
>>
>>     
>
>
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