dave green
    [Not displayed]
    What are they used for?

    I have a few and do not know what they are used for. Are they an ISDN cross over converter of some type?
    David Tessari
    no they are a loopback jack.. they can respond to network commands to loopback the circuit at that point.. I rarely include them anymore.. especially for MM710 cards that have a CSU onboard.

    Inactive Forum User
    Are these pn 700406101 or Lucent pn 107988867? I need 500 pc sat least

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