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18
Ensure that all phones are on-hook. Connect a volt
meter between the M lead and ground at the 66-type
connecting block for one of the bad tie lines.
> If the voltage is 48 volts, go to step 20.
> If the voltage is not 48 volts, go on to step 19.
19
Try the following steps one at a time:
a
b
c
Reverse 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.
Try 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.
Replace 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.
Tie Line Troubleshooting 4-21