• Country
• Israel

• Manufacturer / Brand
• Maxxtro Ltd; Rishon LeZion

• Year
• 2000 ??

• Category
• Telephony - wire and wireless

• Radiomuseum.org ID
• 305317

Click on the schematic thumbnail to request the schematic as a free document.

• Wave bands
• Wave Bands given in the notes.

• Power type and voltage
• No Power needed

• Loudspeaker
• - - No sound reproduction output.

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: ADSL filter MB-4090 - Maxxtro Ltd; Rishon LeZion

• Shape
• Very small Portable or Pocket-Set (Handheld) < 8 inch.

• Dimensions (WHD)
• 51 x 32 x 50 mm / 2 x 1.3 x 2 inch

• Notes

• Before analogue telephone services were replaced by IP telephony, many domestic subscribers obtained internet access via ADSL modems operating on frequencies well above the voice band of 300 - 3400 Hz. For an analogue home installation, ADSL devices can be connected directly to each telephone socket provided a low-pass filter is inserted between each telephone and the telephone socket to avoid mutual interference with the high-frequency ADSL signals (which are typically above 25 kHz).
          
  The MB-4090 adapter with integrated filter is designed to plug directly into a TT83 telephone socket, allowing analogue telephones and ADSL devices to be operated from the socket simultaneously. In modern installations, TT83 sockets are replaced by RJ45 ones.

  Wall socket connector: TT83.
  Telephone socket: 1 x A6.
  ADSL jack: 1 x RJ11.

  Passive design. (No transistors)
  6 toroidal ferrite-cored inductors, 3 in series in each line. The three different chokes ensure that the impedance remains high over a broad band of frequencies, in spite of self resonances in any one of them.
  1 22 nF bypass capacitor.
  2 22 ohm series resistors.
  DC continuity to telephone socket for local loop current.
  Continuity for low-frequency ring signal.
  Internal 2A 250v fuse.

  Made in Taiwan.

• Net weight (2.2 lb = 1 kg)
• 0.330 kg / 0 lb 11.6 oz (0.727 lb)

• Author
• Model page created by Bruce Taylor. See "Data change" for further contributors.

• Other Models

• Here you find 1 models, 1 with images and 1 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Maxxtro Ltd; Rishon LeZion