Tester for PCM cables 120 ohm

Discussion in 'Wireless & RF Design' started by hanih, Feb 13, 2011.

  1. hanih

    Thread Starter New Member

    Feb 13, 2011
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    0
    HI all,

    I have PCM cable or E1 cable

    how I can make testing for its ohm bu ahmmeter

    is there any way

    many thanks for all

    Hani
     
  2. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
    6,357
    718
    I can't decipher your question.

    Are you trying to find the current handling ability of a wire?

    The resistance of a wire?
     
  3. hanih

    Thread Starter New Member

    Feb 13, 2011
    3
    0
    Hi,

    many thanks for your reply

    as you know E1 cable(pcm) is 120ohm and network cables is 50 to 60 ohm

    so now i don't know exactly what is meaning by this ohm? and how i can find out this ohm by ohmmeter

    thanks again
    hani
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
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  5. hanih

    Thread Starter New Member

    Feb 13, 2011
    3
    0
    Hi,

    many thanks

    PCM cables are totaly different it not coaxial cable

    Hani
     
  6. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,346
    Hello,

    Take a look at the attached PDF.
    It is a lecture note.

    Bertus
     
  7. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
    6,357
    718
    The "Ohm" of the cable is the characteristic impedance. The CSU/DSU and Telco Demarc handle the "Electrical termination" for you, so you only need to use cable that is within the specification.

    As you mention E1 vs. T1 or DS1, I assume you are non-US? Are you trying to use a different connector cable for the E1?
     
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