XRT7295AE_00 Просмотр технического описания (PDF) - Exar Corporation

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производитель

XRT7295AE_00

DS3/Sonet STS-1 Integrated Line Receiver

Exar Corporation 

XRT7295AE

System A

XR-T7296

Transmitter

0-450 ft.

0-450 ft.

System B

Cross

Connect

Frame

DSX-3

or STSX-1

Type 728A

Coaxial Cable

XRT7295AT

Receiver

Figure 2. Application Diagram

SYSTEM DESCRIPTION

Receive Path Configurations

In the receive signal path (see Figure 1), the internal

equalizer can be included by setting REQB = 0 or

bypassed by setting REQB = 1. The equalizer bypass

option allows easy interfacing of the XRT7295AE device

into systems already containing external equalizers.

Figure 3 illustrates the receive path options.

In Case 1 of Figure 3, the signal from the DSX-3

cross-connect feeds directly into RIN. In this mode, the

user should set REQB = 0, engaging the equalizer in the

data path.

In Case 2 of Figure 3, external line build-out (LBO) and

equalizer networks precede the XRT7295AE device. In

this mode, the signal at RIN is already equalized, and the

on-chip filters should be bypassed by setting REQB=1.

In applications where the XRT7295AE device is used to

monitor DS3 transmitter outputs directly, the receive

equalizer should be bypassed.

Maximum input amplitude under all conditions is 850mV

pk.

Rev.1.20

5

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