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laforge, 10/30/2023 08:11 PM
- Table of contents
- BildTel 001
BildTel 001¶
The Telekom-branded BildTel 001 was likely the first commercially available ISDN video phone in Germany.
(Only digital marketing picture I could find online, courtesy of Picture Allianze / Matthias Hiekel)
Architecture¶
The system consists of the following parts:- A TV screen with built-in 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.
Codec unit¶
TV Camera¶
TV / BTX Unit¶
BTX decoder¶
- EPROM image: bildtel001_tv10_btxdecoder_16772_074_349_27C010.bin
Keyboard/receiver unit¶
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:
Connections¶
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
TV Camera¶
- connects to the Codec unit using a proprietary high-density connector that appears to carry both video and power
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
Keyboard/receiver unit¶
- has a cable with TAE connector attached (connects to codec unit)
Further Reading¶
Updated by laforge 9 months ago · 12 revisions