Motorola SG4-DRT-2X Instruções de Operação descarregar pdf (Página 75)

Modules 4-3

SG4000 Installation and Operation Manual

SG4-R/* Optical Receiver

The SG4-R/* is a line of forward-path optical receivers used in the SG4000 node platform. It is

designed for use with a Motorola Omnistar GX2

or similar optical transmitter.

The SG4-R/* line delivers the high output levels required in the SG4000. The two-stage receiver

uses an integrated optical-hybrid photodetector and a push-pull amplifier for improved RF

performance over the entire 40 MHz through 1 GHz passband. It is enabled and disabled in

response to a signal from the embedded plug-in module (EPIM). This provides excellent

isolation, improved reliability, and reduced power consumption when the receiver is used in

redundant applications.

The SG4-R/* is equipped with special drive circuitry that provides thermal compensation, thus

eliminating the need to make any set-up adjustments or gain set-backs.

The wavelength selection jumper is factory-set and provides optimum calibration in a 1310 nm

system but is scaled accordingly for 1550 nm.

If you need to reset the jumper, move it to the preferred position as illustrated in Figure 4-2.

Figure 4-1 illustrates a functional block diagram of the SG4-R/* receiver.

Figure 4-1

SG4-R/* block diagram

JXP

Slope

-20 dB

Module

enabled

Module

enable

Optical

input

output

RFTemp

Comp Hybrid

-3 to

+2 dBm

Optical power

test point

(1 V/mW)

Module enable

logic

Hybrid current

monitor

Matching

network

Module

fault

+5V

+24V

SPI interface

Optical receiver hybrid

Microprocessor

Optical power

monitor

1 2 ... 70 71 72 73 74 75 76 77 78 79 80 ... 107 108

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