[VoIP] Berry 314A trunk test set

[Jerry Petrizze]

Steph:  Sorry I didn't answer all of your question.  It does exist in both
MF and DTMF. However some of the keys sound normal, that's why I thought
might be in the key pad logic.?  And yes without a road map your kind of
lost.  I will keep digging.
Jerry
----- Original Message ----- 
From: "Steph Kerman" <stfkerman at jps.net>
To: "Voice Over IP Tandem for Analog Switches" <voip at ckts.info>
Sent: Sunday, November 04, 2007 1:38 PM
Subject: Re: [VoIP] Berry 314A trunk test set


> Very hard to say what the problem is without seeing a schematic.  Some
> time back Paul doped out some superficial aspects of how it generates
> tones.  IIRC it uses a digital technique based on parallel output shift
> registers with weighted resistor values to perform a D/A function.
> Presumably there would have to be 2 such implementations, with analog
> summing otherwise the sample values would have to be summed.... probably
> beyond what they would attempt with a 6800 family CPU.
>
> If only one tone is present, how can it be that you hear a beat note?
> That seems contradictory.
>
> Is the problem evident on all keys in both MF and DTMF modes?  Specific
> keys only?
>
> Steph
>
> Jerry Petrizze wrote:
> > Thank you anyway Paul since I did not have the Ops. manual for it ether.
> >
> > Steph: Everything seems to work on it except the tones are messed up.
> > Like when you press the # one key in the MF mode you hear a beet note
> > and one tone. If you look at the test point where the tones can be
> > checked you just see one tone being generated. I believe the problem
> > lies in the key pad interpolation circuitry.???
> > Jerry P.
> >
> >
> > ----- Original Message -----
> > From: "Steph Kerman" <stfkerman at jps.net>
> > To: "Voice Over IP Tandem for Analog Switches" <voip at ckts.info>
> > Sent: Sunday, November 04, 2007 12:42 PM
> > Subject: Re: [VoIP] Berry 314A trunk test set
> >
> >
> >> Same experience here.  What is the problem with it?
> >>
> >> =SK=
> >>
> >> Paul Wills wrote:
> >>
> >>> Oops, I guess you meant documentation for maintenance. Good luck. I
was
> >>> never able to get anything like that out of Berry.
> >>>
> >>> PDW
> >>>
> >>> ----- Original Message -----
> >>> From: "Jerry Petrizze" <t2600 at sbcglobal.net>
> >>> To: "Voice Over IP Tandem for Analog Switches" <voip at ckts.info>
> >>> Sent: Sunday, November 04, 2007 3:36 PM
> >>> Subject: [VoIP] Berry 314A trunk test set
> >>>
> >>>> Help!!! Needed, service documentation on a Berry 314A Trunk Test Set.
> >>>> Thank you Jerry Petrizze
> >>>>
> >>>>
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