AT&T DEFINITY 7100 series Bedienungsanleitung PDF herunterladen (Seite 82)

PORT CIRCUIT PACKS

CO Trunk (TN2138) — non-US Installations

The TN2138 provides eight analog CO trunk ports. Each port has

tip and ring signal leads. The TN2138 has 50Hz, 12kHz, and 16kHz

PPM.

CO Trunk (TN2147) — non-US Installations

The TN2147 provides eight analog CO trunk ports. Each port has

tip and ring signal leads.

The TN2147 uses four (one for each pair of ports) dual subscriber

line audio processing circuits (DSLACs) that can be administered to

meet the following transmission and DC signaling requirements:

●

Loop-start signaling

Earth-calling and loop-calling guarded clearing signaling

The DSLACs convert analog signals to digital signals and digital sig-

nals to analog signals in order to interface the analog CO trunks to

the system’s digital TDM bus.

Data Line (EIA) TN726

Provides eight serial asynchronous Electronics Industries Associa-

tion (EIA) ports with modem interfaces that can be connected

through ADUs to EIA ports (such as RS-232C) on data terminal

equipment (DTE). The TN726B uses Mode 2 or Mode 3 data

transfer protocol. The DTE can be adjuncts and peripheral equip-

ment, such as: data terminals, printers, host computers, PCs,

graphics and facsimile systems, and call detail acquisition and pro-

cessing systems. The TN726B works in conjunction with a TN553

Packet Data Line circuit pack.

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AT&T DEFINITY 7100 series Bedienungsanleitung Seite 82