Motorola SG 2000 Instruções de Operação descarregar pdf (Página 17)

-8

8 Overview

AT&T SLW2500 Installation and Operation Manual

SG2-LR Receiver

The receiver module, SG2-LR, is designed specifically for high performance in the SLW2500.

The SG2-LR receiver uses an integrated optical-hybrid photo-detector for improved RF

performance over the entire 54 MHz through 870 MHz passband.

Figure 2-6 illustrates a functional block diagram of the SG2-LR receiver:

Figure 2-6

SG2-LR receiver functional diagram

Module

enable

output

Optical

input

Hybrid current

sense signal

(10V/A)

Hybrid current

test point

(1.0 V/A)

Optical power

sense signal

(1 V/mW)

Optical power

test point

(1 V/mW)

Module

enabled

Module

fault

Threshold

comparators

Optical power

monitor

Threshold

comparators

Optical receiver hybrid

Matching

network

Module enable

logic

Hybrid current

monitor

+24V

Low

Normal

High

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 52 53

STARLINE 1
Contents 3
Contents iii 5
Introduction 6
Figure 1-2 7
SLW2500 node — open 7
Using This Manual 8
Related Documentation 8
Document Conventions 8
If You Need Help 8
Calling for Repairs 9
Overview 10
Housing 11
Port Locations 12
Gaskets 13
Power Supply 14
Forward Path 15
SG2-LR Receiver 17
Return Path 18
Level Control 19
Options and Accessories 19
Gain Selection 20
Tilt Selection 21
Bench Setup 22
Figure 3-2 23
SLW2500 RF chassis 23
Powering the Node 24
SLW 2500 25
Power Supply Settings 26
Forward Path Padding 28
Installation 30
Strand Wire Mounting 32
Coaxial Cables 34
Fiber Cables 35
Operation 37
SG2-DFBT Optical Transmitter 39
Feature Description 40
Configuration 41
Wavelength Selection Jumper 42
Return Path RF 43
Specifications 45
Parameter Specifications 46
Parameter Specification 46
Torque Specifications 50
Abbreviations and Acronyms 51
473205-001-99 53

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