AT&T AT&T manual Station Port Circuit Packs

●TN758 Pooled Modern

Provides two integrated 212-modem compatible conversion resources for switched connections between analog endpoints (modems), or a digital endpoint and an analog endpoint. A maximum of two TN758s (4 conversion resources) is permitted in each cabinet.

Station Port Circuit Packs

●TN726 Data Line

Provides eight ports for Asynchronous Data Units (ADUs). Used for in-building service within 2000 feet of the system cabinets. Data speeds from 300 bps to 19.2 Kbps are supported. Service beyond 2000 feet at less than 19.2 Kbps is supported; see Section 5 “Technical Specifications.” Extends a serial communications link from the system to data equipment over standard station wiring.

●TN735 MET Line

Provides four ports for Multibutton Electronic Telephone (MET) sets. Used for in- building service within 1000 feet of the system cabinets.

●TN742 Analog Line

Provides eight ports for single-line voice terminals with or without a message waiting lamp. Also supports Off Premises Stations (OPS) and out-of-building service. Auxiliary equipment interfaces are also supported. Used for service within 24,000 feet of the system cabinets. Five voice terminals can be bridged onto each port. Only two terminals can be off-hook simultaneously on each port, otherwise transmission can be degraded.

Note: The Off-Premises-Stations must be FCC registered.

●ZTN78 Tip Ring Line

Provides eight ports for single-line sets with or without message waiting lamps. Used for in-building nonbridged voice terminal service within 2000 feet of the system cabinets.

Note: Equipment connected to the ZTN78 Tip Ring Line CP must meet the following requirements:

●AC impedance: 600 ohms

●DC current: Less than 30ma at 48 volts

● Ringer Equivalence Number (REN): Less than 1.15 (Set plus adjuncts)

●ZTN79 ATL Line

Provides eight ports for MERLIN® voice terminals. Used for service within 1000 feet (305 m) of the system cabinets. Off-premises extensions are not supported. Out-Of- Building stations require In-Building and In-Range Out-of-Building (IROB) units.

●ZTN84 STARLAN Interface (V2)

Provides four ports for interface with AT&T STARLAN NETWORKs. It supports four connections between data endpoints connected to the PBX and data endpoints connected to the STARLAN NETWORK. The Network Extension Unit must be colocated with the System 25 cabinets.

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