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T7234A

Compliance with the New ETSI PSD Requirement

Agere -> LSI Corporation 

T7256 Single-Chip NT1 (SCNT1) Transceiver

Data Sheet

January 1998

Application Overview

The T7256 is intended for use in ISDN networks as part of a 2-wire to 4-wire converter (NT1) or as part of a termi-

nal adapter (TA), providing 2-wire termination of the network with available voice and/or data ports. Local switching

of terminal voice/data is also supported by the T7256. Figure 3 shows the NT1 and TA applications. See Using the

T7256 in a Combination TE/TA Environment in the Application Briefs section for a detailed explanation of an appli-

cation that has both TE and TA functions.

ISDN

TE

(TERMINAL

EQUIPMENT)

SWITCHING SYSTEM

4-WIRE

S/T

NETWORK TERMINATION (NT1)

T7256

2-WIRE

2B1Q

LT

ISDN LINE

CARD

TERMINAL

(e.g., RS–232)

AND POTS

CONNECTIONS

VOICE/DATA

PORTS

TERMINAL ADAPTER (TA)

VOICE/

DATA

LOGIC

T7256

2-WIRE

2B1Q

LT

ISDN LINE

CARD

Figure 3. Applications of T7256

5-2293 (C)

10

Lucent Technologies Inc.

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