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Port Circuits
The following port circuit packs provide the link between trunks and external equipment and
the TDM bus:
Analog Line (TN742)
ATL Line (ZTN79)
Auxiliary Trunk (TN763)
Data Line (TN726)
DID Trunk (TN753)
Ground Start Trunk (ZTN76)
Loop Start Trunk (ZTN77)
MET Line (TN735)
STARLAN Interface (ZTN84)
Tie Trunk (TN760B)
Tip Ring Line (ZTN78).
Figure 3-6 shows the equipment types that can be connected to the digital switch by the Call
Processor and port circuit packs.
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