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BildTel 001 » History » Version 13

laforge, 10/30/2023 08:19 PM

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h1. BildTel 001
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The Telekom-branded *BildTel 001* was likely the first commercially available ISDN video phone in Germany.
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{{thumbnail(isdn-bildtelefon-picture-alliance-zb-matthias-hiekel-11764519.jpg,size=400)}} 
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(Only digital marketing picture I could find online, courtesy of Picture Allianze / Matthias Hiekel)
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h2. Architecture
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The system consists of the following parts:
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* A TV screen with built-in [[BTX__Prestel__Videotex__Minitel|BTX]] decoder (inherited from [[LOEWE_Multitel_TV10]])
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* A keyboard + phone-receiver combo (inherited from [[LOEWE_Multitel_TV10]])
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* A _desktop-computer-like_ box called the Codec (containing the actual ISDN video telephony part, implemented by AEG/OLYMPIA)
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* A video camera
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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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h3. Codec unit
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The Codec unit ("Bildeinheit") consists of a variety of different circuit boards:
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* 1x power supply
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* 4x "mainboards" stacked on top of each other (two sandwiches of two PCBA)
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** boards have a number of DIN 41612 slots for plug-in cards
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* 9x CODEC ADSP boards plugged into slots of the top two mainboards
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* 1x OUTDIG sandwich, consisting of two PCBA plugged into slots of the top mainboard
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** this is the TV output board, generating and digital-analog-converting analog TV signal
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* 1x FIXME sandwich, consisting of two PCBA plugged into slots of a mainboard
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** this is the camera input board, receiving and digitizing the analog TV camera signal
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h4. AEG-OLYMPIA CODEC ADSP
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This board exists 9 times in total. There are no visible differences between the boards; also the label on the GAL is identical.
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PCB Marking: @1601914L11T@
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Connector Marking: None
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|ADI ADSP-2101|Digital Signal Processor|
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|VX-8111 10.0000 MHz|Crystal Oscillator|
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|GAL20V8A (4012-001/2)|GAL|
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|2x IDT 7201SA25J|FIFO|
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|2x IDT 7202SA25J|FIFO|
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|3xCY7C199-45VC|RAM|
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* GAL image: attachment:bildtel001-aeg_olympia_codec_adsp_4012-001_2_GAL20V8A.jed
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h4. AEG-OLYMPIA OUTDIG
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PCB Marking: @2401913L1T@
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Connector Marking: @35.103-3030.2 SN. 3051@
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top PCBA:
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|Brooktree Bt101|Triple 8-bit VIDEODAC|
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|Xilinx XC2018-100|FPGA 100 CLBs, 1000 Gates|
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|S-Data SXO-300C 27.00000 MHz|Crystal Oscillator|
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|3x IDT 7201SA25J|FIFO|
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bottom PCBA: FIXME
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h3. TV Camera
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h3. TV / BTX Unit
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h4. BTX decoder 
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* EPROM image: attachment:bildtel001_tv10_btxdecoder_16772_074_349_27C010.bin
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h3. Keyboard/receiver unit
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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:
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* EPROM image: attachment:bildtel001_keyboard_74E84.251U22g_1.0.0_010389_M2764A.bin
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h2. Connections
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h3. Codec unit
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* connects to ISDN basic-rate S0 interface using 8P8C/RJ45 plug
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* has two proprietary connectors for attaching video cameras
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* has two SCART connectors (one for audio/video output to the TV)
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* 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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* has another TAE jack (purpose unknown)
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* 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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h3. TV Camera
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* connects to the Codec unit using a proprietary high-density connector that appears to carry both video and power
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h3. TV unit
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* has an RF input for TV broadcast signals (PAL)
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* has a SCART input for baseband audio/video from peripherals (like the Codec unit)
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* has a DIN speaker output for attaching an external speaker
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* has a built-in BTX decoder with
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** an unused DIN port intended to connect to the [[DBT-03]] BTX-Modem (not used in the ISDN video application)
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** an unused centronics port
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** an auxiliary V.24 port on a DIN connector interfacing the SUB-D 9 of the Codec unit
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h3. Keyboard/receiver unit
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* has a cable with TAE connector attached (connects to codec unit)
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h2. Further Reading
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* "Thread on the fediverse covering the BildTel 001":https://chaos.social/@LaF0rge/111317641831468838
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