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17
18
19
Hang up. Repeat steps 8 and 9 for any other ports
being tested.
> If all tie lines are good, go on to step 25.
> If one or more of the tie lines are not good, go m
step 18.
NOTE:
For the following steps, refer to Table 4-1 on
page 4-15 to identify the pin numbers of the
tie line jack associated with the leads
identified in the steps. Use the green ground
wire on the power supply or a pipe ground.
Ensure that all phones are on-hook. Connect a volt
meter between the T lead, pin number 5 on the tie line
jack, 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.
Try the following steps one at a time:
a
Reverse the T,R pair and the T1 ,Rl pair, then retest
the condition.
> If the condition has been corrected, go back to
step 8.
> If the condition has not been connected, go on
to step 19b.
Try another tie line port, then retest the condition.
> If the condition has been connected, the original
tie line port is faulty. Go back to step 8.
> If the condition has not been corrected, go on
to step 19c.
b
Tie Line Troubleshooting
4-27