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telephony:ta1232_td816_td1232_hw_arch

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telephony:ta1232_td816_td1232_hw_arch [2025/04/28 23:35] – prppedrotelephony:ta1232_td816_td1232_hw_arch [2025/04/29 02:40] (current) – external edit 127.0.0.1
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 Funnily enough, there's a second card for KX-TD systems called KX-TD193DX, that also does DTMF (hence the extra «D» in the name, I guess), and this card also happens to be nearly identical to the TA-123293 card, which also had DTMF decoding facilities. The only significative difference I could spot was an extra IC, which communicated with TA1232 via four extra pins that KX-TD's don't have.  Funnily enough, there's a second card for KX-TD systems called KX-TD193DX, that also does DTMF (hence the extra «D» in the name, I guess), and this card also happens to be nearly identical to the TA-123293 card, which also had DTMF decoding facilities. The only significative difference I could spot was an extra IC, which communicated with TA1232 via four extra pins that KX-TD's don't have. 
  
 +However, for some reason my monkey brain can't process, Panasonic decided that this board, that was manufactured at least as early as 1994, wouldn't be supported by KX-TD system until later revisions, late in the 90's. This is weird. This is wasteful. But it's also how capitalism works, some would say. 
 +
 +So, as currently, I'm fighting capitalism in a infinitesimal scale: a ridiculously pointless exercise to reverse engineer those boards and understand how different they are. I am, however, a salaryman, and also a lot of other alter egos, each trying to fight for my already limited time, so I can't promise anything. Somebody once told me <del>the world is gonna roll me</del> we have to under-promise and over-deliver. Here we over-promise and under-deliver. Get used to it. 
 +
 +**Anyway**, the first thing to note is that half of the board does basically the same thing: we still got four FSK modems and two serial-to-parallel converter IC's. According to the TA123293's schematic(({{ :telephony:43_00_13.pdf |}})), the DTMF IC is connected in parallel, completely independent to the FSK processing circuitry from the TIP and RING to the the addressing/data lines. So it's really two cards in one. 
 +
 +Though I haven't thus far been able to track down any schematics for KX-TD193(X) (at least not for a price I'm prepared to pay, i.e. > $0), it seems that the addressing circuitry differs quite a bit from what we have on the DX/123293 version. 
 +
 +FIXME
telephony/ta1232_td816_td1232_hw_arch.1745894149.txt.gz · Last modified: 2025/04/28 23:35 by prppedro

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