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Trunk Port Circuit Packs
● TN753 DID Trunks
Provides eight ports for immediate-start or wink-start Direct
trunks.
● TN760B Tie Trunks
Inward Dialing (DID)
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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