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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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