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LIST OF FIGURES
Figure 3-1. System 25 Digital Switch. . . . . . . . . . . . . . . . .
3-1
Figure 3-2.
Call Processor (ZTN82 or ZTN128) Circuitry . . . . . . . . . .
3-3
Figure 3-3.
Memory (ZTN81 or ZTN127) Circuitry . . . . . . . . . . . .
3-5
Figure 3-4.
TDM Bus Time Slot Generation (Not A Timing Diagram) . . . . .
3-6
Figure 3-5.
TDM Bus Diagram - Three Cabinet System . . . . . . . . . .
3-9
Figure 3-6.
Equipment Connected to System 25 Via the Call Processor and Port
Circuit Packs (Sheet l of 3) . . . . . . . . . . . . . . . .
3-11
Figure 3-7.
Port Circuit Pack Common Circuitry . . . . . . . . . . . . .
3-15
Figure 3-8. Unique Ground Start Trunk (ZTN76) Circuitry . . . . . . . . .
3-17
Figure 3-9. Unique Loop Start Trunk (ZTN77) Circuitry . . . . . . . . . .
3-19
Figure 3-10. Unique Tip Ring Line (ZTN78) Circuitry . . . . . . . . . . .
3-20
Figure 3-11. Unique ATL Line (ZTN79) Circuitry . . . . . . . . . . . . .
3-23
Figure 3-12. Unique Data Line (TN726) Circuitry . . . . . . . . . . . . .
3-25
Figure 3-13. Unique MET Line (TN735) Circuitry . . . . . . . . . . . . .
3-27
Figure 3-14. Unique Analog Line (TN742) Circuitry . . . . . . . . . . . .
3-28
Figure 3-15. Unique DID Trunk (TN753) Circuitry . . . . . . . . . . . .
3-31
Figure 3-16. Unique Tie Trunk (TN760B) Circuitry . . . . . . . . . . . .
3-33
Figure 3-17. Tie Trunk (TN760B) Circuit Pack Option Switches . . . . . . . .
3-33
Figure 3-18. Unique Auxiliary Trunk (TN763) Circuitry . . . . . . . . . . .
3-36
Figure 3-19. Service Circuit (ZTN85) . . . . . . . . . . . . . . . . .
3-40
Figure 3-20. Tone Detector (TN748) Circuit . . . . . . . . . . . . . . .
3-42
Figure 3-21. Pooled Modem (TN758) Circuit . . . . . . . . . . . . . . .
3-43
Figure 3-22. System Software Partitioning . . . . . . . . . . . . . . .
3-48
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