AT&T AT&T manual Trunk Port Circuit Packs, Circuit Pack Compatibility

Trunk Port Circuit Packs

●TN753 DID Trunks

Provides eight ports for immediate-start or wink-start Direct Inward Dialing (DID) trunks.

●TN760B Tie Trunks

Provides four ports for Type 1 E&M, Type 1 E&M Compatible, or Type 5 Simplex tie trunks. Operating protocols include automatic, immediate-start, wink-start, or delay dial. The TN760B contains option switches for supporting the following signaling formats:

–Type 1 E&M Standard (Unprotected)

–Type 1 E&M Compatible ([Unprotected)

–Type 1 E&M Compatible (Protected)

–Type 5 Simplex

●TN763 Auxiliary Trunk

Provides four ports for on-premises auxiliary equipment (paging systems and dictation systems).

●ZTN76 Ground Start Trunk

Provides eight ports for ground start Central Office (CO), Foreign Exchange (FX), or Wide Area Telephone Service (WATS) trunks

●ZTN77 Loop Start Trunk

Provides eight ports for loop-start CO, FX, or WATS trunks.

Refer to Section 9, “Glossary” for Ground Start and Loop Start definitions. Ground Start trunks are recommended for use where possible.

Trunk specifications are provided in Section 5, “Technical Specifications.”

Circuit Pack Compatibility

The following System 75 CPs can be used in System 25, if required:

●The TN742 Analog Line can be used instead of the ZTN78 Tip Ring CP. The TN742 supports bridged stations and out-of-building or Off-Premises Stations (OPS), the ZTN78 does not.

● The TN762B Hybrid Line (Version 4 or later) can be used instead of the ZTN79.

●The TN747 CO Trunk can be used instead of the ZTN76 (Ground Start Trunk) or the ZTN77 (Loop Start Trunk).

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