Olson Technology 7-OR User Manual

LegacyPlus 7-OR SERIES RETURN TRANSMITTER

INSTRUCTION MANUAL

7-OR-RT/xxx

INSTRUCTION MANUAL

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025-371546 Rev X1 11-20-06

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TABLE OF CONTENTS

SAFETY WARNINGS Page 3

INTRODUCTION Page 4

Figur e 1 - 7-OR-RT Module

INSTALLATION Page 4

Installation/Environmental Considerations Page 4

Optical Connectors and Cleaning Page 5

External T est Points Page 5

User Interface Page 5

Electrical, Environmental & Mechanical Parameters Page 5

Alignment Procedure Page 6

Figure 2 - RF Drive Level & RF Drive Test Point Levels vs. Loading

Checking the Laser RF Drive Level Page 7

Table 1 - Fabry-Perot Transmitter Setup
Table 2 - DFB Transmitter Setup

Programming the 7-OR-R T to Support Automatic Shutdown Page 8

Figure 3 - Location of Laser RF Drive Test Point and RF Drive Level
Adjustment Control

Connecting the Pigtail to the Return Fiber Page 9

Figure 4a - ALERT ON Mode
Figure 4b - ALERT OFF Mode
Table 3 - All Test Points

TEST POINTS AND CONTROL - REFERENCE Page 10

Figure 4 - All 7-OR-RT Test Points and Controls
Figure 5 - Mounting the 7-OR-RT Return Transmitter into the 7-OR Node

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SAFETY WARNINGS

LASER RADIATION

The 7-OR laser transmitter emits invisible laser radiation that can cause

permanent eye damage. AVOID DIRECT EXPOSURE TO BEAM.

Operate the transmitter only with the proper optical fiber installed in the

transmitter optical connector . The power to the 7-OR should be turned off whenever the optical connector is

opened or exposed (as when the fiber connection is being installed or removed from the transmitter connector).

NEVER USE ANY OPTICAL INSTRUMENT TO VIEW THE OUTPUT OF THE LASER
TRANSMITTER. “OPTICAL INSTRUMENT” INCLUDES MAGNIFYING GLASSES, ETC.

NEVER LOOK INTO THE OUTPUT OF THE LASER TRANSMITTER

NEVER LOOK INT O THE OUTPUT OF A FIBER CONNECTED TO A LASER

TRANSMITTER.

NEVER LOOK INTO OR USE ANY OPTICAL INSTRUMENT TO VIEW THE DIST ANT
END OF A FIBER THA T MA Y BE CONNECTED DIRECTLY OR VIA AN OPTICAL SPLIT,
TO A TRANSMITTER THA T MAY BE OPERA TING. THIS SPECIFICALL Y APPLIES TO
FIBERS THA T ARE TO BE CONNECTED TO RECEIVERS OR OTHER DEVICES A T ANY
DIST ANCE FROM THE LASER TRANSMITTER.

SHOCK HAZARD

Care should be used when installing the 7-OR to prevent shock and

injury as there are voltages within the Node which exceed 48 VAC.

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INTRODUCTION

The Olson Technology Inc. 7-OR-RT is a high quality, cost effective, Return Transmitter module designed around the
latest optical transmitter technology . It is designed to operate and meet full specifications with an optical output level of
1 to 3 mW. The 7-OR-RT module is shown in Figure 1.

Figure 1 - 7-OR-R T Module

INST ALLA TION/ENVIRONMENT AL CONSIDERA TIONS

The 7-OR-RT operates with an exterior temperature on the Node of -40 to + 60°C. However, like any other electronic
device, it will probably have a longer life span if it is not operated at the upper limit of it's temperature range continuously.
Installation of the 7-OR-R T should be done such that water, dirt and other contaminates do not enter either the Node or
the module. Do not install equipment in locations that are accessible by either children or other unqualified personnel.
This unit is meant to be field-installed into the DiamondPoint 7-OR Optical Node by qualified field service technicians.

T o plug the return transmitter module into the optical receiver’s main circuit board, follow these steps:

1. With a TORX TX09 driver , loosen the seven screws holding the optical cover in place. Notice that besides
protecting the optical receiver’s main circuit board, the optical cover also has markings that indicate where you will
install the 7-OR-RT return transmitter. See Figure 5 for a detailed view .

2. Flip the optical cover up and over, so that it lays bottom-side up in the cover of the 9-ORH optical housing.

3. Plug the 7-OR-RT into the 7-OR optical receiver. The pins on the underside of the 7-OR-RT fit directly into the
holes in the 7-OR module’s main circuit board. The return transmitter’s circuit board rests on top of the 7-OR
receiver’s factory-installed optical pigtail.

NOTE: Be sure the fiber termination of the incoming fiber matches that of the transmitter, an easy way to tell is by the
color of the termination. The transmitter will have either a green SA/APC, or a blue SC/UPC connector. The incoming
fiber connector MUST match this color. If the connector is green, but the fiber termination is blue (or vice versa), then
the signal passing through the fiber will be degraded and in many cases unusable.

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OPTICAL CONNECT ORS AND CLEANING

The standard optical connector provided with the 7-OR-RT is an SC/APC with an 8° angle. No tools are required for
connection to/from this type of optical connector. The fiber ends can be damaged by the insertion of contaminated
connectors into a bulkhead or receptacle, or by the insertion of a clean connector into a dirty bulkhead. Fiber connectors
should never be left uncovered. Optical connectors should be cleaned before usage.

Warning: When powered, optical transmitters generate invisible, high-ener gy laser beams.
Even when the transmitter is not powered, laser beams may be present in the incoming
cable. Although you can’ t see them, these beams can cause tissue injury, including permanent
eye damage. Whenever the optical cable is disconnected from the receiver or patch panel,
avoid direct contact with the end of the cable. Be absolutely certain the optical equipment
at both ends of the cable is powered off before attempting to clean connectors.

1. Power off the optical equipment at either end of the optical cable designated for cleaning. V erify the power is of f by
checking the power indicator LEDs.

2. If the connector is plugged into an adapter or bulkhead, unplug it and cover the connector with a clean cap.

3. If there’s a cover on the adapter or bulkhead, remove it. Spray the inside of the adapter or bulkhead with compressed
air, using a can of compressed air equipped with an extension tube.

4. Clean the bulkhead or adapter by flushing it with 90% isopropyl alcohol without additives or using a stick-type
cleaner. Let the alcohol dry .

5. Remove the protective cap from the connector, then spray the connector face with compressed air .

6. Next, clean the connector face using a lint-free tissue moistened with 90% isopropyl alcohol without additives.
Carefully clean the connector face.

7. Once you have finished cleaning the connector, align the connector key with the slot in the bulkhead or adapter , and
install the connector into place.

EXTERNAL TEST POINTS

The 7-OR-RT has three external test points. The first is for optical power output calibrated at 1V/mW. It should be
monitored with a high impedance voltmeter. This test point is for long term monitoring purposes. The optical output power
should be measured using an optical power meter at the time of installation. The second is an RF test port for monitoring
the RF drive level to the laser. The nominal drive level is +8dBmV per channel with 6 channel loading. Consult the
checklist for the exact value. The third is a test point for laser bias current calibrated at 20mV/mA. It should be
monitored with a high impedance voltmeter. This test point is for long term monitoring purposes.

USER INTERF ACE

Laser RF Drive Level Test Point About +8dBmV/channel for 6-channel loading (See Figure 2)
Optical Output Level 1V/mW
Laser Bias Current 20mV/mA

ELECTRICAL, ENVIRONMENT AL & MECHANICAL P ARAMETERS

Dimensions (WxHxD) 3.2” x 1.95" x 1.0" (8.1 cm x 5.0 cm x 2.5 cm)
W eight <0.5 lbs (0.22 kg)
Operating Temperature Range -40 to +70ºC (temperature at the mounting plate)
Powering +12 V
Power Dissipation < 2 W
Mounting Inside Magnavox/Philips DiamondPoint 7-OR optical node

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ALIGNMENT PROCEDURE

The 7-OR-R T optical transmitter’ s OMI has been optimized with an RF drive level of about +8.0dBmV per carrier with
maximum loading (Six analog carriers) at the Laser RF Drive test point. Due to the number of different configurations
offered for the DiamondPoint 7-OR node, the amount of loss through the node can vary, therefore transmitter drive
levels should be set via the Laser RF Drive test point.

The chart below shows the drive levels are required for a given number of channels or QAM/QPSK loading. For
Example, if the transmitter is going to be loaded with three video channels, than the Laser RF Drive test point needs to
be approximately +10.5dBmV per carrier.

If QAM, QPSK, or similar digital loading is being used, than the loading is calculated by total bandwidth rather than the
number of channels. If loading from 5 to 29MHz, then the total input bandwidth is 24MHz. The chart below shows us that
24MHz of bandwidth is equivalent to four video channels, resulting in an Laser RF Drive test point level of +9.0dBmV
per channel.

Note: The numbers discussed throughout this manual are based on a typical DFB laser based transmitter. Transmitters
using FP lasers typically have RF levels 4 dB lower than DFB laser based transmitters. Transmitters using CWDM
lasers have RF drive levels about 6 dB lower than Standard DFB laser based transmitters.

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Figure 2 - RF Drive Level & RF Drive Test Point Levels vs. Loading

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CHECKING THE LASER RF DRIVE LEVEL

For best performance, you will check and adjust the Laser RF drive level into the return transmitter Y ou can measure
this level using the Laser RF Drive test point and the procedure below.

1. Attach 7-OR-RT TP T ool RF test point adapter to the return transmitters Laser RF Drive test point, shown in
Figure 3. Connect the other end of the adapter to a spectrum analyzer.

2. Next, you will use the RF test point to check that the return transmitter’s RF drive level matches a desired level,
which depends upon the channel loading of the return signal. Each 7-OR-RT comes with a checklist with the drive
level noted for 35MHz loading. This indicates the level of the video pilot at the RF test point, in dBmV , for a return
signal with one video channel. Refer to the tables below for information about other channel loadings.

3. Rotate the RF Drive Adjustment control, shown in Figure 3, until you obtain the desired level.

T able 1 - Fabry-Perot T ransmitter Setup

T able 2 - DFB T ransmitter Setup

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Figure 3 - Location of Laser RF Drive Test Point and RF Drive Level Adjustment Control

Programming the 7-OR-R T to Support Automatic Shutdown

The 7-OR-R T return transmitter supports Automatic Shutdown feature, which halts the transmission of light through
severed or improperly mated fiber optic cables You can program the 7-OR-RT to operate in either the ALER T ON or
ALER T OFF mode.

In the ALERT ON mode, the 7-OR-R T transmits a return signal over the return fiber as long as the 7-OR optical
receiver remains powered and the forward light signal entering the receiver is above a certain pre-set or alert level. If
the 7-OR loses power or the forward light signal falls below the pre-set level, the return transmitter will stop transmitting
optical signal to the return receiver at the head-end. If the return receiver supports Automatic Shutdown, it will sense
the disappearance of light and shutdown the forward transmitter .

In the ALERT OFF mode, the return transmitter will operate as long as the 7-OR module remains powered. It will not
trigger Automatic Shutdown it the level of the forward optical signal decreases.

1. Find JP2 shown in Figure 4. The 7-OR-R T module is shipped with the ALER T ON mode.

2. T o enable the Automatic Shutdown feature, leave the jumper as shown in Figure 4a. This is the ALER T ON
condition.

3. T o disable the Automatic Shutdown feature, move the jumper as shown in Figure 4b. This is the ALER T OFF
condition.

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Figure 4a - ALER T ON Mode Figure 4b - ALERT OFF Mode

CONNECTING THE PIGTAIL TO THE RETURN FIBER

Next, you will connect the 7-OR-RT module’ s bare pigtail to the return fiber . The method you use to connect the pigtail
to the return fiber depends on whether the incoming fiber is bare or has an optical connector already installed.

T able 3 - All T est Points

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TEST POINTS AND CONTROL - REFERENCE

The 7-OR-R T return transmitter has three test points that you can use to monitor the performance of the return
transmitter module- In addition. a control on the circuit board helps you set up the 7-OR-R T by adjusting the RF drive
level to the transmitter.

Figure 4 - All 7-OR-RT T est Points and Contr ols

Figure 5 - Mounting the 7-OR-R T Return T ransmitter into the 7-OR Node

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