AT&T 518-600-016 manual If you do not hear dial tone, go on to step

13 Go off-hook on station B.

>If you hear dial tone, go on to step 14.

>If you do not hear dial tone, go on to step 14

14 Dial station A.

>If the tie line does not drop (within five seconds) go on to step 15.

>If the tie line drops within five

step 17.

15 Listen for ringback tone.

>If you hear ringback tone, go on to step 16.

>If you do not hear ringback tone, go to step 17. 16 Pickup the handset at station A.

>If you are connected to station A, the tie line is good. Goon to step 17.

>If you are not connected to station A, go 17.

17 Hang up. Repeat steps 8 and 9 for any other 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 to step 18.

NOTE: For the following steps, refer to Table 4-1on 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.

4-20 Tie Line Troubleshooting