BildTel 001 » History » Revision 9
Revision 8 (laforge, 10/28/2023 04:46 PM) → Revision 9/27 (laforge, 10/29/2023 08:26 PM)
{{>toc}} h1. BildTel 001 The Telekom-branded *BildTel 001* was likely the first commercially available ISDN video phone in Germany. {{thumbnail(20231028_114259.jpg,size=400)}} {{thumbnail(20231028_114402.jpg,size=400)}} {{thumbnail(isdn-bildtelefon-picture-alliance-zb-matthias-hiekel-11764519.jpg,size=400)}} (Only digital marketing picture I could find online, courtesy of Picture Allianze / Matthias Hiekel) h2. Architecture The system consists of the following parts: * A TV screen with built-in [[BTX__Prestel__Videotex__Minitel|BTX]] decoder (inherited from [[LOEWE_Multitel_TV10]]) * A keyboard + phone-receiver combo (inherited from [[LOEWE_Multitel_TV10]]) * A _desktop-computer-like_ box called the Codec (containing the actual ISDN video telephony part, implemented by AEG/OLYMPIA) * A video camera 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. h4. Codec unit {{thumbnail(20231028_114437.jpg,size=400)}} {{thumbnail(20231028_120250.jpg,size=400)}} {{thumbnail(20231028_120314.jpg,size=400)}} {{thumbnail(20231028_120334.jpg,size=400)}} {{thumbnail(20231028_120934.jpg,size=400)}} {{thumbnail(20231028_120943.jpg)}} h4. TV Camera {{thumbnail(20231028_115010.jpg,size=400)}} h4. TV Unit {{thumbnail(20231028_114503.jpg,size=400)}} {{thumbnail(20231028_132851.jpg,size=400)}} {{thumbnail(20231028_133058.jpg,size=400)}} {{thumbnail(20231028_133103.jpg,size=400)}} {{thumbnail(20231028_133211.jpg,size=400)}} {{thumbnail(20231028_133255.jpg,size=400)}} {{thumbnail(20231028_133336.jpg,size=400)}} h4. Keyboard/receiver unit {{thumbnail(20231028_114558.jpg,size=400)}} {{thumbnail(20231028_114639.jpg,size=400)}} {{thumbnail(20231028_141412.jpg)}} {{thumbnail(20231028_142128.jpg)}} {{thumbnail(20231028_142246.jpg)}} {{thumbnail(20231028_142251.jpg)}} Actual Cherry keyboard PCBA after full disassembly, ultrasonic cleaning of all keycaps and lots of isopropanol on the PCB, removing what might be decades old coke residue: {{thumbnail(20231029_093033.jpg,size=400)}} h3. Connections h4. Codec unit * connects to ISDN basic-rate S0 interface using 8P8C/RJ45 plug * has two proprietary connectors for attaching video cameras * has two SCART connectors (one for audio/video output to the TV) * has a TAE jack for attaching an analog phone for the audio port (connected to the combined keyboard/receiver unit by default) * has another TAE jack (purpose unknown) * has a V.24 interface on a SUB-D 9 connector which connects to the built-in BTX decoder of the TV unit h4. TV Camera * connects to the Codec unit using a proprietary high-density connector that appears to carry both video and power h4. TV unit * has an RF input for TV broadcast signals (PAL) * has a SCART input for baseband audio/video from peripherals (like the Codec unit) * has a DIN speaker output for attaching an external speaker * has a built-in BTX decoder with ** an unused DIN port intended to connect to the [[DBT-03]] BTX-Modem (not used in the ISDN video application) ** an unused centronics port ** an auxiliary V.24 port on a DIN connector interfacing the SUB-D 9 of the Codec unit h4. Keyboard/receiver unit * has a cable with TAE connector attached (connects to codec unit) h2. Further Reading * "Thread on the fediverse covering the BildTel 001":https://chaos.social/@LaF0rge/111317641831468838