Troubleshooting and Repair
71
Tr
oub
le
sho
oting
Loop Start Line/Trunk
The Loop Start Line/Trunk serves the standard domestic applications
and small businesses that have key systems and PBX applications.
Figure 13: Loop Start Line/Trunk
Table 6: Loop Start Line/Trunk Summary
Signal
Loop Start Line PBX
Outgoing
Loop Start Line PBX
Incoming
Seize
Tip-Ring leads activated
(shorted); Loop Current flows
in line
90Vac is applied to Ring
lead in 2 sec on, 4 sec
off cadence
Seize
Acknowledgment
Loop Current and/or dial tone
generated
-
Digits
Loop Current toggled (Rotary)
or DTMF
-
Stop Dial
-
-
(Sheet 1 of 2)
Summary of Contents for SX-200 EL
Page 1: ...TECHNICIAN S HANDBOOK LIGHTWARE 19 RELEASE 3 0 ...
Page 11: ...Chapter 1 Introduction ...
Page 12: ......
Page 32: ...Technician s Handbook 22 ...
Page 33: ...Chapter 2 Routine Maintenance ...
Page 34: ......
Page 55: ...Chapter 3 Troubleshooting and Repair ...
Page 56: ...Technician s Handbook 46 ...
Page 88: ...Technician s Handbook 78 Figure 16 E M Trunk Type I 2 wire ...
Page 110: ...Technician s Handbook 100 ...
Page 111: ...Chapter 4 Programming ...
Page 112: ......
Page 168: ...Technician s Handbook 158 ...
Page 169: ...Chapter 5 Installation ...
Page 170: ......
Page 239: ...Chapter 6 Maintenance Commands ...
Page 240: ......
Page 258: ...Technician s Handbook 248 ...
Page 261: ...Notes ...
Page 262: ...Technician s Handbook Notes ...