• Hard Plug Loopback Tests for E1 Lines

    The hardware loopback plug test is used to see if the router has any faults. If a router passes a hardware loopback plug test, then the problem exists elsewhere on the line.

    Creating the Loopback Plug for E1 on RJ-45


    Complete the following steps to create a loopback plug for E1:

    1. Use wire cutters to cut a working cable that is 5 inches long with a connector attached.

    2. Strip the wires.

    3. Twist the wires from pins 1 and 4 together.

    4. Twist the wires from pins 2 and 5 together.

    5. Leave the other wires alone

    Creating the Loopback Plug for E1 on DB-15

    Complete the following steps to create a loopback plug for E1 on DB-15:

    1. Use wire cutters to cut a working DB-15 cable that is 5 inches long with a connector attached.

    2. Strip the wires.

    3. Twist the wires from pins 2 and 15 together.

    4. Twist the wires from pins 9 and 8 together.

    5. Leave the other wires alone.



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