BildTel 001¶

The Telekom-branded BildTel 001 was likely the first commercially available ISDN video phone in Germany.

Architecture¶

• 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 Unit¶

Keyboard/receiver unit¶

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)