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 3-6shows the equipment types that can be connected to the digital switch by the Call Processor and port circuit packs.

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AT&T AT&T manual Port Circuits