BildTel 001 » History » Version 26
laforge, 03/12/2024 12:19 PM
1 | 9 | laforge | {{>toc}} |
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3 | 1 | laforge | h1. BildTel 001 |
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5 | 3 | laforge | The Telekom-branded *BildTel 001* was likely the first commercially available ISDN video phone in Germany. |
6 | 1 | laforge | |
7 | 3 | laforge | {{thumbnail(20231028_114259.jpg,size=400)}} |
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9 | 1 | laforge | |
10 | 9 | laforge | {{thumbnail(isdn-bildtelefon-picture-alliance-zb-matthias-hiekel-11764519.jpg,size=400)}} |
11 | (Only digital marketing picture I could find online, courtesy of Picture Allianze / Matthias Hiekel) |
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12 | |||
13 | 20 | laforge | The specific unit I managed to acquire has been with the "Hochschule für Telekommunikation Leipzig (HfTL)":https://de.wikipedia.org/wiki/Hochschule_f%C3%BCr_Telekommunikation_Leipzig until its closure in 2022. |
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15 | 1 | laforge | h2. Architecture |
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17 | The system consists of the following parts: |
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18 | 2 | laforge | * A TV screen with built-in [[BTX__Prestel__Videotex__Minitel|BTX]] decoder (inherited from [[LOEWE_Multitel_TV10]]) |
19 | 1 | laforge | * A keyboard + phone-receiver combo (inherited from [[LOEWE_Multitel_TV10]]) |
20 | * A _desktop-computer-like_ box called the Codec (containing the actual ISDN video telephony part, implemented by AEG/OLYMPIA) |
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21 | * A video camera |
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22 | |||
23 | 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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24 | |||
25 | 10 | laforge | h3. Codec unit |
26 | 4 | laforge | |
27 | 24 | laforge | {{thumbnail(DSC00346.JPG,size=800)}} |
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29 | 25 | laforge | {{thumbnail(DSC00349.JPG,size=400)}} |
30 | {{thumbnail(DSC00355.JPG,size=400)}} |
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32 | 25 | laforge | {{thumbnail(20231028_114437.jpg)}} |
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34 | {{thumbnail(20231028_120314.jpg)}} |
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37 | 24 | laforge | {{thumbnail(20231028_120943.jpg)}} |
38 | 25 | laforge | |
39 | 24 | laforge | |
40 | 4 | laforge | |
41 | 13 | laforge | The Codec unit ("Bildeinheit") consists of a variety of different circuit boards: |
42 | 1 | laforge | * 1x power supply |
43 | * 4x "mainboards" stacked on top of each other (two sandwiches of two PCBA) |
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44 | 20 | laforge | ** top two boards (CODER / DECODER) have a number of DIN 41612 slots for plug-in cards |
45 | * 6x CODEC ADSP boards plugged into slots of the CODER |
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46 | * 3x CODEC ADSP boards plugged into slots of the DECODER |
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47 | * 1x OUTDIG/OUTANA sandwich, consisting of two PCBA plugged into slots of the DECODER mainboard |
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48 | 13 | laforge | ** this is the TV output board, generating and digital-analog-converting analog TV signal |
49 | 20 | laforge | * 1x INDIG/INANA sandwich, consisting of two PCBA plugged into slots of the CODER mainboard |
50 | 13 | laforge | ** this is the camera input board, receiving and digitizing the analog TV camera signal |
51 | 1 | laforge | |
52 | h4. AEG-OLYMPIA CODEC ADSP |
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53 | 13 | laforge | |
54 | 20 | laforge | This board exists 9 times in total (6x for CODER, 3x for DECODER). It hosts a digital signal processor, RAM and some FIFOs. |
55 | 13 | laforge | |
56 | 20 | laforge | There are no visible differences between the boards; also the label on the GAL is identical. |
57 | |||
58 | 13 | laforge | PCB Marking: @1601914L11T@ |
59 | Connector Marking: None |
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60 | |||
61 | {{thumbnail(20231030_105751.jpg,size=400)}} |
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62 | {{thumbnail(20231030_105725.jpg,size=400)}} |
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63 | {{thumbnail(20231030_105648.jpg,size=400)}} |
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64 | |||
65 | |||
66 | |ADI ADSP-2101|Digital Signal Processor| |
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67 | |VX-8111 10.0000 MHz|Crystal Oscillator| |
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68 | |GAL20V8A (4012-001/2)|GAL| |
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69 | |2x IDT 7201SA25J|FIFO| |
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70 | |2x IDT 7202SA25J|FIFO| |
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71 | |3xCY7C199-45VC|RAM| |
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72 | |||
73 | * GAL image: attachment:bildtel001-aeg_olympia_codec_adsp_4012-001_2_GAL20V8A.jed |
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74 | |||
75 | h4. AEG-OLYMPIA OUTDIG |
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76 | |||
77 | PCB Marking: @2401913L1T@ |
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78 | Connector Marking: @35.103-3030.2 SN. 3051@ |
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79 | |||
80 | top PCBA: |
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81 | 14 | laforge | |
82 | {{thumbnail(20231030_110051.jpg,size=400)}} |
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83 | 13 | laforge | |
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85 | 1 | laforge | |Brooktree Bt101|Triple 8-bit VIDEODAC| |
86 | 13 | laforge | |Xilinx XC2018-100|FPGA 100 CLBs, 1000 Gates| |
87 | |S-Data SXO-300C 27.00000 MHz|Crystal Oscillator| |
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88 | |3x IDT 7201SA25J|FIFO| |
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89 | |||
90 | 20 | laforge | h4. AEG-OLYOMPIA OUTANA |
91 | 13 | laforge | |
92 | 20 | laforge | TBD |
93 | 15 | laforge | |
94 | h4. AEG-OLYMPIA INANA |
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95 | |||
96 | This is the analog input board. |
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97 | 16 | laforge | |
98 | PCB Marking: @0202914L1T@ |
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99 | Connector Marking: @35.103-3023.8/01@ |
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100 | 18 | laforge | |
101 | 19 | laforge | {{thumbnail(20231030_214231.jpg,size=400)}} |
102 | 18 | laforge | {{thumbnail(20231030_214141.jpg,size=400)}} |
103 | 15 | laforge | |
104 | h4. AEG-OLYMPIA INDIG |
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105 | |||
106 | This is the digital input board, containing the video ADC and support circuitry |
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107 | |||
108 | PCB Marking: @0202915L1T@ |
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109 | 1 | laforge | Connector Marking: @35.103-3020.2/01@ |
110 | 17 | laforge | |
111 | {{thumbnail(20231030_214057.jpg,size=400)}} |
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112 | {{thumbnail(20231030_214157.jpg,size=400)}} |
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113 | 15 | laforge | |
114 | |Brooktree Bt253KPJ|Color Video ADC| |
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115 | |Xilinx XC3030-70|FPGA| |
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116 | |DOC31CC 27.000M|Crystal Oscillator| |
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117 | |3x TI TLC272CP|OpAmp; likely buffers for analog R/G/B| |
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118 | |0900-002/2|SPI flash for FPGA bitstream?| |
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119 | |3x QSL QS8201-15JR|512x9 FIFO| |
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120 | 10 | laforge | |
121 | 4 | laforge | h3. TV Camera |
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123 | {{thumbnail(20231028_115010.jpg,size=400)}} |
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124 | 11 | laforge | |
125 | 4 | laforge | h3. TV / BTX Unit |
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127 | 7 | laforge | {{thumbnail(20231028_114503.jpg,size=400)}} |
128 | {{thumbnail(20231028_132851.jpg,size=400)}} |
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129 | {{thumbnail(20231028_133058.jpg,size=400)}} |
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130 | {{thumbnail(20231028_133103.jpg,size=400)}} |
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131 | {{thumbnail(20231028_133211.jpg,size=400)}} |
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132 | 1 | laforge | {{thumbnail(20231028_133255.jpg,size=400)}} |
133 | 11 | laforge | {{thumbnail(20231028_133336.jpg,size=400)}} |
134 | |||
135 | h4. BTX decoder |
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136 | |||
137 | 4 | laforge | * EPROM image: attachment:bildtel001_tv10_btxdecoder_16772_074_349_27C010.bin |
138 | 10 | laforge | |
139 | 4 | laforge | h3. Keyboard/receiver unit |
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141 | {{thumbnail(20231028_114558.jpg,size=400)}} |
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142 | {{thumbnail(20231028_114639.jpg,size=400)}} |
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144 | {{thumbnail(20231028_141412.jpg)}} |
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145 | 5 | laforge | {{thumbnail(20231028_142128.jpg)}} |
146 | {{thumbnail(20231028_142246.jpg)}} |
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147 | 4 | laforge | {{thumbnail(20231028_142251.jpg)}} |
148 | 9 | laforge | |
149 | 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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150 | {{thumbnail(20231029_093033.jpg,size=400)}} |
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151 | 12 | laforge | |
152 | * EPROM image: attachment:bildtel001_keyboard_74E84.251U22g_1.0.0_010389_M2764A.bin |
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153 | 10 | laforge | |
154 | 1 | laforge | h2. Connections |
155 | 10 | laforge | |
156 | 1 | laforge | h3. Codec unit |
157 | |||
158 | * connects to ISDN basic-rate S0 interface using 8P8C/RJ45 plug |
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159 | * has two proprietary connectors for attaching video cameras |
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160 | * has two SCART connectors (one for audio/video output to the TV) |
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161 | * 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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162 | * has another TAE jack (purpose unknown) |
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163 | * 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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164 | 10 | laforge | |
165 | 1 | laforge | h3. TV Camera |
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167 | * connects to the Codec unit using a proprietary high-density connector that appears to carry both video and power |
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168 | 10 | laforge | |
169 | 1 | laforge | h3. TV unit |
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171 | * has an RF input for TV broadcast signals (PAL) |
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172 | * has a SCART input for baseband audio/video from peripherals (like the Codec unit) |
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173 | * has a DIN speaker output for attaching an external speaker |
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174 | * has a built-in BTX decoder with |
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175 | ** an unused DIN port intended to connect to the [[DBT-03]] BTX-Modem (not used in the ISDN video application) |
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176 | ** an unused centronics port |
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177 | ** an auxiliary V.24 port on a DIN connector interfacing the SUB-D 9 of the Codec unit |
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178 | 10 | laforge | |
179 | 1 | laforge | h3. Keyboard/receiver unit |
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181 | 9 | laforge | * has a cable with TAE connector attached (connects to codec unit) |
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183 | 21 | laforge | h2. History |
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185 | The information below is based on a 2023 conversation between Harald Welte and Roland Gaidzik (project manager of the AEG-OlYMPIA Video Phone). |
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186 | |||
187 | Prior to the _Bildtel 001_, there was a research project by Daimler-Benz in Ulm, who developed the codec and created a much larger prototype using a VME-bus computer. |
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188 | |||
189 | The task of the AEG-Olympia (by then also already a Daimler subsidiary) was to translate that research into an actual product that can be produced and sold. The result was the _Bildtel 001_. |
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190 | |||
191 | * More than 100 units (possibly multiple hundreds, but certainly less than 1000 units) were built. |
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192 | ** Most of them were purchased by Bundespost |
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193 | ** a few were given as loner/rental devices |
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194 | ** probably less than 10 were ever sold directly by AEG-Olympia to other custmers |
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195 | * Stollmann (in Hamburg) was responsible for building all the electronics (of the video/codec unit) |
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196 | * The ISDN call control and user interface handling was developed by AEG-Olympia in Konstanz |
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197 | ** 4 people working in Marketing for the product |
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198 | 22 | laforge | ** 7 people working on R&D |
199 | 21 | laforge | * Actual assembly of te final product happened at the AEG-Olympia factory in Wilhelmshaven |
200 | * Testing/approvals done at a FTZ Facility |
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201 | * The Codec part (even for the final product) was still provided by the research team in Ulm |
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202 | * It is expected/assumed, that the Bildtel 001 already implements the ITU-T H.320 standards, as there was strong desire for this by Bundespost |
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203 | * The _LOEWE MultiTel TV10_ is used almost without modifications. Only very minor softare modifications were made |
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204 | ** It is not expected that the actual BTX/CEPT decoder is used in the product. The UI is generated by the codec unit and presented as analog RGB on the SCART to the TV |
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205 | ** The BTX/CEPT decoder likely simply passes through the keyboard input to the V.24 interface towards the codec unit |
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206 | * The power supply was a standard industrial power supply bought on the market |
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207 | 22 | laforge | * The video camera was a standard part bought on the market |
208 | 21 | laforge | |
209 | As AEG-Olympia went out of business and shut down, the responsibility of the _Bildtel 001_ was passed on to Dornier (back then also another subsidiary of Daimler-Benz). Apparently the Bundespost was very much encouraging Daimer-Benz to keep that project alive and not let it die together with AEG-Oympia. |
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211 | 23 | laforge | h3. Use in _Piazza Virtuale_ project of _Van Gogh TV_ |
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213 | In 1992 there was an interactive TV project _Piazza virtuale_ done by _Van Gogh TV_, an artist and hacker collective. They pioneered interactive television and aspects of social networks more than a decade before this became possible for people on the Internet. As part of this project, they were using Bidltel 001 phones to transmit audio+video from remote studios to the main TV studio. |
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214 | |||
215 | You can find the following related documents/resources: |
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216 | * "a website documenting the overall project":https://vangoghtv.hs-mainz.de/ |
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217 | * "a document showing signed receipts for video telephony equipment, including Bildtel 001":https://vangoghtv.hs-mainz.de/wp-content/uploads/2021/04/picture-phone-reciepts.pdf |
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218 | * "a reference to both analog slow-scan TV as well as ISDN picture phones" at https://vangoghtv.hs-mainz.de/?portfolio=einsatz-von-slow-scan-tv-und-isdn-bildtelefonen |
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219 | * "interviews with the creators of the project":https://vangoghtv.hs-mainz.de/?page_id=86921 |
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220 | * "an example TV programme whose content was apparently transmitted via Bildtel 001 from Zurich to the TV studio":https://www.youtube.com/watch?v=bZ0WwvG_Pt8&list=PLDUukqMXwk2wJJZM9JhEGoDmx9PX2VTOk&index=24 |
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222 | 9 | laforge | h2. Further Reading |
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224 | 1 | laforge | * "Thread on the fediverse covering the BildTel 001":https://chaos.social/@LaF0rge/111317641831468838 |
225 | 26 | laforge | * "Catalogue record of MSPT":https://emp-web-09.zetcom.ch:443/eMP/eMuseumPlus?service=ExternalInterface&module=collection&objectId=192014&viewType=detailView |