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17.
Hang up. Repeat steps 8 and 9 for any other ports
> If all the line are good, go on to step 25.
> If one or more of the tie lines are not good, go to
step 18.
NOTE:
For the following steps, refer to Table 4-1 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.
TABLE 4-1 Tie Line Jack Pin Identification
Signal
T
R
T1
R1
E
M
Pin No.
5
4
1
2
3
6
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 0 volts, go to step 20.
> If the voltage is not 0 volts, go on to step 19
19
Try the following steps one at a time:
a 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 not been corrected, go on
to step 19b.
Tie Line Troubleshooting
4-15