AT&T DEFINITY 7100 series Bedienungsanleitung PDF herunterladen (Seite 84)

PORT CIRCUIT PACKS

DID Trunk (TN2146) — non-US Installations

The TN2146 provides eight analog DID trunk ports. Each port has

tip and ring signal leads. The TN2146 uses four (one for each pair

of ports) dual subscriber line audio processing circuits (DSLACs)

that can be administered to meet trunk transmission characteristics.

The DSLACs can be set to either a resistive or complex balance

impedance in the voice or AC talk path on the trunk interfaces. The

DSLACs convert analog signals to digital signals and vice-versa to

match the analog DID trunks to the system’s digital TDM bus.

Companding in the TN2146 firmware is programmed to the default

A-law; however, the firmware can be administered to select µ-law

companding.

Digital Line TN754 or TN754B

Provides eight asynchronous digital communications protocol (DCP)

ports that can be connected to the following equipment: 7400

series digital voice terminals, attendant consoles, 510D personal

terminals, MT 515 business communications terminals, and data

modules.

Digital Line (TN2136) — non-US Installations

The TN2136 provides eight ports for connecting the system to the

following DCP endpoints: data adapter modules and digital tele-

phone models one and two. Each port can be connected to a two-

wire digital line. The TN2136 has administrable A-law andµ-law

companding.

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AT&T DEFINITY 7100 series Bedienungsanleitung Seite 84