[HN Gopher] Homelab Analog Telephone Exchange
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       Homelab Analog Telephone Exchange
        
       Author : zdw
       Score  : 42 points
       Date   : 2023-01-14 18:42 UTC (4 hours ago)
        
 (HTM) web link (skagmo.com)
 (TXT) w3m dump (skagmo.com)
        
       | tyingq wrote:
       | Ah, interesting. I saw "analog" and was expecting something more
       | like controlling crosspoint switch ICs[1] to cross connect lots
       | of handsets in arbitrary ways. But this is analog multiplexing,
       | digital routing, etc.
       | 
       | [1] https://www.microsemi.com/product-directory/signal-
       | integrity...
        
       | dark-star wrote:
       | I wonder if his system works with Fax/modem connections. He uses
       | ADCs, so I guess not? That would be a hard requirement for me if
       | I ever built something similar
        
         | aswanson wrote:
         | I think fax modems had 14.4 kbps bandwidth but I'm sure that
         | chip he used has enough dsp horsepower to implement the modem.
        
       | KMag wrote:
       | Anyone from MIT's Tau Epsilon Phi around to confirm/deny that
       | TEPaphone is still running? In the late 1990s/early 2000s, a
       | friend of mine (a brother in TEP) told me about their PBX hand-
       | wired from mechanical relays and stepping switches as a hobby
       | project by one of their brothers a decade or two earlier.
       | Apparently its creator was far more interested in the project
       | than in his coursework, to disastrous effect.
       | 
       | If I recall correctly, every-other class, they needed to decide
       | which brother was going to be the designated recipient of the
       | handed-down arcane design and maintenance knowledge. I believe
       | the title of office was Phone Master, and just like Sith Lords,
       | there were always 2: master and apprentice.
       | 
       | On the plus side, it had a photo sensor sitting over the washer
       | and dryer display lights, so dialling the extension for the
       | washer or dryer would give a busy tone if in use, and a ring tone
       | otherwise.
        
       | yupis wrote:
       | Awesome project
        
       | aswanson wrote:
       | Wish I had enough time for retro projects like this. New stuff
       | gives me too much trouble and takes up too much of my waking
       | hours.
        
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       (page generated 2023-01-14 23:00 UTC)