Filters built with individual chokes as well as filters with current-compensated chokes are available in completely shielded housings for suppressing EMI from communication and control lines, in particular cables into shielded enclosures and shielded rooms. The input and output capacitors are designed as feed-through elements with the result of an attenuation that covers up to 40GHz.

 

analogue types

Applications

  • for signal- and control lines up to 2A
  • for analogue telephone lines up to 3.4kHz
  • Stop band attenuation up to 40GHz

 

Features

  • Use of coaxial feed-through capacitors on input and output
  • Single or current-balanced chokes depending on requirement
  • Insertion loss to CISPR 17

 

Overview of communication line filters

  • Filter for communication lines, type B84312–C20–....
    2 or 20 lines, band with 3.4kHz at line impedance 600 Ω 100mA, 100V ac, 250V dc
  • Filter unit for control lines, type B84312–C30–...
    2 or 20 lines, not matched, 2 x 1A, 100V ac/250V dc
  • Filter for communication lines, type B84312–C40–...
    2 or 20 lines, band with 50kHz at line impedance 600 Ω 100mA, 100V ac, 250V dc
  • Filter for communication lines, type B84312–C50–...
    1 or 10 twin lines, band with 120kHz at line impedance 150 Ω 100mA, 100V ac, 250V dc
  • Filter for communication lines, type B84312–C60–...
    1 twin line, band with 300kHz at line impedance 150 Ω 100mA, 100V ac, 250V dc
  • Filter for communication lines, type B84312–C90–...
    1 or 10 twin lines, matched to 600 Ω 100mA, 100V ac, 250V dc
  • Filter for control lines, type B84312–C100–...
    1 or 10 twin lines, 1A, 160V ac, 250V dc
  • Special filter with D–Sub–Connectors see data sheet B84299–C...–S91x

 

 

 

ISDN types

Applications

  • For ISDN-Interfaces S0, S2
  • UP0 and U2 plus Siemens Hicom installations
  • Stopband attenuation up to 40GHz

 

Features

  • Use of coaxial feed-through capacitors on input and output
  • Single or current-balanced chokes depending on requirement
  • Insertion loss to CISPR 17

 

Overview ISDN–systems and suitable filters

  • Filter for S2 or PCM 30, type B84312–C112–....
    2 lines, band with 5.12MHz at line impedance 120 Ω 100V ac, 250V dc
  • Filter for S0 ISDN, 2B+D, type B84312–C110–....
    2 lines, band with 480kHz at line impedance 85…160 Ω 100V ac, 250V dc
  • Filter for UP0 ISDN, 2B+D, type B84312–C114–....
    2 lines, band with 960kHz at line impedance 100 Ω 100V ac, 250V dc
  • Filter for U2B1Q ISDN, 2B+D, type B84312–C060–....
    2 lines, band with 300kHz at line impedance 135 Ω 100V ac, 250V dc
  • Filter for UK0 ISDN, 2B+D, type B84312–C060–....
    2 lines, band with 300kHz at line impedance 150 Ω 100V ac, 250V dc
  • Filter for U200 1B+D, type B84312–C114–....
    2 lines, band with 640kHz at line impedance 130 Ω 100V ac, 250V dc

 

 

mechanical design

The electrical components are incorporated in an RF-tight case of tin-plated sheet steel. Filters are available for 2 or 20 lines and for upright or flat installation on shielding wall.

 

 

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