18Ensure that all phones are
>If the voltage is 48 volts, go to step 20.
>If the voltage is not 48 volts, go on to step 19.
19Try the following steps one at a time:
aReverse the E and M leads, then retest the condition.
>If the condition has been corrected, go back to step 8.
>If the condition has to step 19b.
bTry another tie line port then retest the condition.
>If the condition has been corrected, the original tie line port is faulty. Go back to step 8.
>If the condition has not been corrected, go on to step 19c.
cReplace the Tie Line Module, then retest the condition.
>If the condition has been corrected, the original Tie Line Module is faulty. Go back to step 8.
>If the condition has not been corrected, stop testing and call the equipment supplier.
If the problem was either the tie line port or the Tie Line Module, call the equipment supplier when you have finished testing.
