BildTel 001 » History » Version 2
laforge, 10/28/2023 03:31 PM
| 1 | 1 | laforge | h1. BildTel 001 |
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| 2 | |||
| 3 | The Tekekom-branded *BildTel 001* was likely the first commercially available ISDN video phone in Germany. |
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| 6 | h2. Architecture |
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| 7 | |||
| 8 | The system consists of the following parts: |
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| 9 | 2 | laforge | * A TV screen with built-in [[BTX__Prestel__Videotex__Minitel|BTX]] decoder (inherited from [[LOEWE_Multitel_TV10]]) |
| 10 | 1 | laforge | * A keyboard + phone-receiver combo (inherited from [[LOEWE_Multitel_TV10]]) |
| 11 | * A _desktop-computer-like_ box called the Codec (containing the actual ISDN video telephony part, implemented by AEG/OLYMPIA) |
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| 12 | * A video camera |
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| 13 | |||
| 14 | 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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| 16 | h3. Connections |
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| 17 | |||
| 18 | h4. Codec unit |
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| 19 | |||
| 20 | * connects to ISDN basic-rate S0 interface using 8P8C/RJ45 plug |
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| 21 | * has two proprietary connectors for attaching video cameras |
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| 22 | * has two SCART connectors (one for audio/video output to the TV) |
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| 23 | * 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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| 24 | * has another TAE jack (purpose unknown) |
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| 25 | * 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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| 26 | |||
| 27 | h4. TV Camera |
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| 28 | |||
| 29 | * connects to the Codec unit using a proprietary high-density connector that appears to carry both video and power |
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| 30 | |||
| 31 | h4. TV unit |
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| 32 | |||
| 33 | * has an RF input for TV broadcast signals (PAL) |
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| 34 | * has a SCART input for baseband audio/video from peripherals (like the Codec unit) |
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| 35 | * has a DIN speaker output for attaching an external speaker |
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| 36 | * has a built-in BTX decoder with |
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| 37 | ** an unused DIN port intended to connect to the [[DBT-03]] BTX-Modem (not used in the ISDN video application) |
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| 38 | ** an unused centronics port |
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| 39 | ** an auxiliary V.24 port on a DIN connector interfacing the SUB-D 9 of the Codec unit |
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| 40 | |||
| 41 | h4. Keyboard/receiver unit |
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| 42 | |||
| 43 | * has a cable with TAE connector attached (connects to codec unit) |
