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Forums › Off topic › Digitel Standard Electric Kirk DK 8700 NZPO deskphone - Button identification assistance needed.
aviationinvestigatio

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#236276 26-May-2018 15:33
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I have a NZPO Digitel landline phone from the 1980's. There are buttons A, B, C, D and R. The 'R'  I would have expected to be 'recall' or 'redial', but it does nothing when pressed.

 

My main interest is what are the A B C D letters designed to do, or how to get them to work?

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Bung
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  #2023051 26-May-2018 16:45
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The original DTMF keypad design allowed for a 4x4 array. ABCD are unused buttons in NZ, I don't remember whether they were disabled. R could be an earth contact recall



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  #2023055 26-May-2018 17:01
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As above, I don't recall the extra buttons doing anything. Is there a socket to plug in a power adapter? Thinking there would have to be if they were programmable speed dial buttons.




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aviationinvestigatio

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  #2023147 26-May-2018 22:24
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Thanks guys! No power plug, so these buttons will be unused ones.

 

Appreciate your valuable assistance.



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  #2023148 26-May-2018 22:30
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And thanks for another reminder of how I'm aging. Both with memory loss, and the age of gear I used to install. :-( haha




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Bung
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  #2023150 26-May-2018 22:37
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I scored one of the fully loaded samples with speakerphone and memory dialler. It had several extra circuit boards stuffed into the case. Without a display the phone didn't need any more power than the line provided. Too many separate parts to be reliable, it's long gone. If the ABCD buttons produced any tones they'd be ignored by the network.

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  #2023197 27-May-2018 09:17
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A, B, C and D are all valid DTMF tones. Quite a few phones had the buttons but nothing ever used them and over time they were just dropped from products.

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