BildTel 001 » History » Version 3
laforge, 10/28/2023 04:27 PM
1 | 1 | laforge | h1. BildTel 001 |
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3 | 3 | laforge | The Telekom-branded *BildTel 001* was likely the first commercially available ISDN video phone in Germany. |
4 | 1 | laforge | |
5 | 3 | laforge | {{thumbnail(20231028_114259.jpg,size=400)}} |
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7 | 1 | laforge | |
8 | h2. Architecture |
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10 | The system consists of the following parts: |
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11 | 2 | laforge | * A TV screen with built-in [[BTX__Prestel__Videotex__Minitel|BTX]] decoder (inherited from [[LOEWE_Multitel_TV10]]) |
12 | 1 | laforge | * A keyboard + phone-receiver combo (inherited from [[LOEWE_Multitel_TV10]]) |
13 | * A _desktop-computer-like_ box called the Codec (containing the actual ISDN video telephony part, implemented by AEG/OLYMPIA) |
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14 | * A video camera |
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16 | The BTX Terminal [[LOEWE_Multitel_TV10]] was used as the "user interface" for the device, adding the _codec_ box to turn it into a video phone. |
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18 | h3. Connections |
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20 | h4. Codec unit |
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22 | * connects to ISDN basic-rate S0 interface using 8P8C/RJ45 plug |
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23 | * has two proprietary connectors for attaching video cameras |
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24 | * has two SCART connectors (one for audio/video output to the TV) |
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25 | * has a TAE jack for attaching an analog phone for the audio port (connected to the combined keyboard/receiver unit by default) |
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26 | * has another TAE jack (purpose unknown) |
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27 | * has a V.24 interface on a SUB-D 9 connector which connects to the built-in BTX decoder of the TV unit |
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29 | h4. TV Camera |
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31 | * connects to the Codec unit using a proprietary high-density connector that appears to carry both video and power |
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33 | h4. TV unit |
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35 | * has an RF input for TV broadcast signals (PAL) |
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36 | * has a SCART input for baseband audio/video from peripherals (like the Codec unit) |
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37 | * has a DIN speaker output for attaching an external speaker |
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38 | * has a built-in BTX decoder with |
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39 | ** an unused DIN port intended to connect to the [[DBT-03]] BTX-Modem (not used in the ISDN video application) |
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40 | ** an unused centronics port |
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41 | ** an auxiliary V.24 port on a DIN connector interfacing the SUB-D 9 of the Codec unit |
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43 | h4. Keyboard/receiver unit |
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45 | * has a cable with TAE connector attached (connects to codec unit) |