Motorola SG 2000 Provozní pokyny stáhnout pdf (Strana 18)

Overview 2

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AT&T SLW2500 Installation and Operation Manual

Return Path

To meet future return-path requirements, you can upgrade the SLW2500 with various optical

transmitters to accommodate data and video signal transmission.

Signal levels are adjusted in the return path using model JXP-* attenuator pads. Units are

typically shipped with a JXP-6 (6 dB) attenuator pad at the input of the transmitter.

Optical Return Transmitters

Three optical return transmitters are available to meet the needs of most return applications.

The three optical return transmitters and their features are:

SG2-DFBT/*

(standard)

Uses an uncooled, isolated DFB laser operating at 1 mW for improved link performance. Carries a full 35 MHz of

digital data or up to two video channels.

SG2-DFBT/3

(optional)

Uses an uncooled, isolated DFB laser operating at 2 mW for improved link performance. Carries a full 35 MHz of

digital data or up to two video channels.

SG2-DRT

(optional)

Uses a digitally modulated laser housed in a module with an RF input port and analog-to-digital conversion

functionality.

All transmitters include thermal compensation circuitry to minimize the change in received

optical and RF signal level at the headend as the node temperature varies. An integrated optical

bulkhead connector and module status indicators enhance fiber management and reduce

troubleshooting time.

Figure 2-7 illustrates a functional block diagram of the SLW2500 transmitter:

Figure 2-7

SLW2500 transmitter block diagram

input

Thermal

compensation

JXP

factory calibration

only

Laser

bias

control

Fiber

output

Laser

current

test

Hybrid

current

test

Optical

power

test

Laser

diode

module

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 52 53

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