User manual for CATV RF fiber optic transmitter

8/12/2019 User manual for CATV RF fiber optic transmitter

1/18

11331100nnmmDDiirreeccttMMoodduullaattiioonnOOppttiiccaallTTrraannssmmiitttteerr

FF--RRFF--TTXXSSeerriieess

--UUSSEERRMMAANNUUAALL--


2/18

Copyright Thor Fiber 2011 2

CONTENT

1.0 DISCLAIMER......................................................................................... 3

2.0 WARRANTY.......................................................................................... 3

2.1 Limited warranty...................................................................... 3

2.2 Limitation of liability.................................................................. 5

2.3 Customer responsibilities............................................................. 5

2.4 Types of hardware warranty service................................................. 6

2.5 Warranty period....................................................................... 7

2.6 Software limited warranty............................................................ 7

2.7 Limited warranty transfer to another country....................................... 8

3.0 SAFETY WARNINGS................................................................................. 8

4.0 INSTALLATION PRECAUTIONS...................................................................... 8

5.0 PACKAGING CONTENT.............................................................................. 9

6.0 PRODUCT SUMMARY .............................................................................10

7.0 INSTALLATION......................................................................................11

7.1 Rack Mounting....................................................................... 11

7.2 RF connection....................................................................... 12

7.3 Optical connection.................................................................. 12

7.4 Cleaning Guidelines................................................................. 12

8.0 TRANSMITTER MANAGEMENT ...................................................................13

8.1 Open menu.......................................................................... 13

8.2 Start-up main menu................................................................. 14

8.3 Menu assistant manual............................................................. 15

8.4 Selecting AGC Mode................................................................. 15

8.5 Selecting MGC Mode................................................................ 15

8.6 Adjusting Input Level for Reduced Number of RF Channels....................... 16


3/18


1.0 DISCLAIMERThor Fiber makes no warranty of any kind with regard to this material, including, but not limited to,

the implied warranties of merchantability and fitness for a particular purpose. Thor Fiber shall notbe liable for errors contained herein or for incidental or consequential damages in connection with

the furnishing, performance, or use of this material. The information contained herein is subject to

change without notice. The only warranties for Thor Fiber products and services are set forth in the

express warranty statements accompanying such products and services. Nothing herein should be

construed as constituting an additional warranty. Thor Fiber shall not be liable for technical or

editorial errors or omissions contained herein. Thor Fiber assumes no responsibility for the use or

reliability of its software on equipment that is not furnished by Thor Fiber.

2.0 WARRANTYThis document contains warranty information for Thor Fiber products.

2.1 Limited warrantyThis Limited Warranty applies only to Thor Fiber hardware products (collectively referred to in

this document as THOR Products) sold by or leased from THOR Limited, its worldwide

subsidiaries, affiliates, authorized resellers, or country distributors (collectively referred to in

this Limited Warranty as THOR ) with this Limited Warranty. The term THOR Hardware

Product is limited to the hardware components and required firmware. The term THOR

Hardware Product DOES NOT include any software applications or programs; non -THOR

products or non-THOR branded peripherals. All non-THOR products or non-THOR branded

peripherals external to the THOR Hardware Product (e.g. fibreoptic patch leads) are provided

AS IS without THOR warranty. However, non-THOR manufacturers and suppliers, or publishers

may provide their own warranties directly.

THOR guarantees that the THOR Hardware Products that you have purchased or leased from

THOR are free from defects in materials or workmanship under normal use during the Limited

Warranty Period. The Limited Warranty Period starts on the date of purchase or lease from

THOR . Your dated sales or delivery receipt, showing the date of purchase or lease of theproduct, is your proof of the purchase or lease date. You may be required to provide proof of

purchase or lease as a condition of receiving warranty service. You are entitled to hardware

warranty service according to the terms and conditions of this document if a repair to your

THOR Hardware Product is required within the Limited Warranty Period.

During the Limited Warranty Period, THOR will, at its discretion, repair or replace any defective

component. All component parts or hardware products removed under this Limited Warranty

become the property of THOR . In the unlikely event that your THOR Hardware Product has

recurring failures, THOR , at its sole discretion, may elect to provide you with (a) a replacement

unit of THOR s choosing that is the same or equivalent to your THOR Hardware Product in

performance or (b) to give you a refund of your purchase price or lease payments (less interest)

instead of a replacement. This is your exclusive remedy for defective products.


4/18


It is mandatory that the unit product number and serial number be made available when

requesting a warranty service event. Failure to do so may result in the event being deemed out

of warranty by THOR or, THOR 's Authorised Service Providers, and therefore chargeable to the

requester.

Unless otherwise stated, and to the extent permitted by local law, new THOR Hardware

Products may be manufactured using new materials or new and used materials equivalent to

new in performance and reliability. THOR may repair or replace THOR Hardware Products (a)

with new or previously used products or parts equivalent to new in performance and reliability,

or (b) with equivalent products to an original product that has been discontinued. Replacement

parts are warranted to be free from defects in material or workmanship for ninety (90) days or,

for the remainder of the Limited Warranty Period of the THOR Hardware Product they are

replacing or in which they are installed, whichever is longer.

The procedure for handling returned units is as follows:1. The documents accompanying a returned item,2. Record the Authorized Service Provider name and ID number,3. The serial number of the device,4. Description of the fault.This Limited Warranty does not extend to any product from which the serial number has been

removed, damaged or rendered defective;

1. as a result of accident, misuse, abuse, contamination, improper or inadequatemaintenance or calibration or other external causes;

2. by operation outside the usage parameters stated in the user documentation that shippedwith the product;

3. by software, interfacing, parts or supplies not supplied by THOR4. improper site preparation or maintenance5. loss or damage in transit6. by modification or service by anyone other than:

THOR THOR authorized service provider your own installation of end-user replaceable THOR or THOR approved parts if

available for your product in the servicing country or region.THOR is not responsible for any interoperability or compatibility issues that may arise when (1)

products, software, or options not supported by THOR are used; (2) configurations not

supported by THOR are used; (3) parts intended for one system are installed in another system

of different make or model.


5/18


2.2 Limitation of liabilityIf the THOR hardware product fails to work as warranted above, THOR s maximum liability

under the limited warranty is expressly limited to the lesser of the price paid for the product orthe cost of repair or replacement of any hardware components that malfunction in conditions

of normal use. Except as indicated above, in no event will THOR be liable for any damages

caused by the product or the failure of the product or perform, including any lost profits or

savings, business interruption, loss of use or any other commercial or economic loss of any kind,

or special, incremental, or consequential damages. THOR is not liable for any claim made by a

third party or made by you for the third party. This limitation of liability applies whether

damages are sought, or a claim made, under this limited warranty or as a tort claim (including

negligence and strict product liability), a contract claim or any other claim. This limitation in

liability cannot be waivered or amended by any person. This limitation of liability will be

effective even if you have advised THOR , or an authorized representative of THOR , of the

possibility of any such damages or even if such possibility were reasonably foreseeable. This

limitation of liability, however, will not apply to claims for personal injury.

This limited liability gives specific legal rights. You may also have other rights that may vary from

state to state or from county to country. You are advised to consult applicable state or country

laws for a full determination of rights.

If THOR determines that damage/failure that exists is not covered by the warranty, the end user

will be contacted to determine whether such damage/failure should be repaired for a charge or

whether the Product should be returned to the end user as received. All associated

transportation and handling costs are charged to the customer.THOR 's warranty obligation extends only to products, options, and parts manufactured or

distributed by THOR .

2.3 Customer responsibilitiesTo enable THOR to provide the best possible support and service during the Limited Warranty

Period, you will be required to:

1. Maintain a proper and adequate environment, and use the THOR Hardware Product inaccordance with the instructions furnished.

2. Cooperate with THOR in attempting to resolve the problem over the telephone. This mayinvolve performing routine diagnostic procedures, installing additional software, removing

third-party options, and/or substituting options.

3. Notify THOR if you use THOR Hardware Products in an environment that poses a potentialhealth or safety hazard to THOR employees or subcontractors. THOR may require you to

maintain such products under THOR supervision and may postpone warranty service until

you remedy such hazards.

4. Perform additional tasks as defined within each type of warranty service listed below andany other actions that THOR may reasonably request in order to best perform the warranty

support.


6/18


2.4 Types of hardware warranty serviceListed below are the types of warranty services that may be applicable to the THOR Hardware

Product you have purchased. For more details, refer to the Limited warranty period section.

1. Advanced unit replacement warranty serviceYour Thor Fiber Warranty may include an advanced unit replacement warranty service.

Under the terms of the advanced unit replacement warranty service, THOR will ship a

replacement unit directly to you if the THOR Hardware Product you purchased is diagnosed

as defective. On receiving the replacement unit, you will be required to return the defective

unit back to THOR , in the packaging that arrives with the replacement unit, within a defined

period of time, normally five (5) days. THOR will incur all shipping and insurance costs to

return the defective unit to THOR . Failure to return the defective unit may result in THOR

billing you for the replacement unit.

2. Pick up and return warranty serviceYour Thor Fiber Warranty may include a pick up and return warranty service. Under the

terms of pick up and return service, THOR will pick up the defective unit from your location,

repair it, and return it to your location. THOR will incur all repair, logistics, and insurance

costs for this type of service.

3. Mail-in warranty serviceYour Thor Fiber Warranty may include a mail-in warranty service. Under the terms of

mail-in service, you will be required to ship your THOR Hardware Product to an authorized

service location for warranty repair. You must prepay any shipping charges, taxes, or duties

associated with transportation of the product to the repair location. In addition, you are

responsible for insuring any product you ship, and you assume risk of loss during shipping.

THOR will return the repaired product to you and incur all logistics and insurance costs to

return the product to you.

4. Carry-in warranty serviceYour Thor Fiber Warranty may include a carry-in warranty service. Under the terms of

carry-in service, you will be required to deliver your THOR Hardware Product to anauthorized service location for warranty repair. You must prepay any shipping charges, taxes,

or duties associated with transportation of the product to and from the service location. In

addition, you are responsible for insuring any product shipped or returned to an authorized

service location, and you assume risk of loss during shipping.

5. On-site warranty serviceYour Thor Fiber Warranty may include an on-site warranty service. Under the terms of

on-site service, THOR may, at its sole discretion, determine if a defect can be repaired by a

service call at the location of the defective unit. If THOR ultimately determines that an

on-site service call is required to repair a defect, the call will be scheduled during standard

office hours unless otherwise stated for the THOR Hardware Product you purchased.


7/18


Standard office hours are typically 08:00 to 17:00, Monday through Friday, but may vary

with local business practices. If the location of the defective unit is outside the customary

service zone (typically 50km), response times may be longer or there may be additional

charges. In order to receive on-site support, you must:

Have a representative present when THOR provides warranty services at your site, Notify THOR if products are being used in an environment which poses a potential

health or safety hazard to THOR employees or subcontractors,

Subject to its reasonable security requirements, provide THOR with sufficient, free, andsafe access to and use of all facilities, information, and systems determined necessary

by THOR to provide timely support,

Ensure that all manufacturers labels (such as serial numbers) are in place, accessible,and legible,

Maintain an environment consistent with product specifications and supportedconfigurations

2.5 Warranty periodEach unit comes with 3-year warranty. In case of any damaged, user should not open the top

cover for repair, otherwise, even within a warranty period. Tamper with the unit will void the

warranty. Long-time maintenance service and upgrade is available via additional maintenance

program (chargeable option).

2.6 Software limited warrantyExcept as provide in the applicable software end-user license or program license agreement, or

if otherwise provided under local law, software products, including any software products, are

provided AS IS and with all faults, and THOR hereby disclaims all other warranties and

conditions, either express, implied, or statutory, including, but not limited to, warranties of title

and non-infringement, any implied warranties, duties or conditions of merchantability, of

fitness for a particular purpose, and lack of viruses.

Some states/jurisdictions do not allow exclusion of implied warranties or limitations on the

duration of implied warranties, so the above disclaimer may not apply to you in its entirety. To

the maximum permitted by applicable law, in no event shall THOR or its suppliers be liable forany special, incidental, indirect, or consequential damages whatsoever (including, but not

limited to, damages for loss of profits or confidential or other information, for business

interruption, for personal injury, for loss of privacy arising out of or in any way related to the

use or inability to use the software product, even if THOR or any supplier has been advised of

the potential of such damages and even if the remedy fails of its essential purpose.. Some

states/jurisdictions do not allow the exclusion or limitation of incidental or consequential

damages, so the above limitation or exclusion may not apply to you.

THOR 's only warranty obligations with respect to software distributed by THOR under the

THOR brand name are set forth in the applicable end-user license or program license

agreement provided with that software. If the removable media on which THOR distributes the

software proves to be defective in materials or workmanship within ninety (90) days of


8/18


purchase, your sole remedy shall be to return the removable media to THOR for replacement.

2.7 Limited warranty transfer to another countryUnder the THOR Global Limited Warranty program, products may be purchased in onecountry/region and transferred to another country/region, where THOR or its authorized

service providers offer warranty service for the same product model number without voiding

the warranty. Warranty terms, service availability, and service response times may vary from

country to country or region to region. Standard warranty service response time is subject to

change due to local parts availability. When the product has been transferred to another

country it will be entitled to the same warranty as if the product had been purchased in the

country to which it has been transferred.

THOR is not responsible for any tariffs or duties that may be incurred in transferring the

products. Transfer of the products may be covered by export controls issued by the United

Kingdom or other governments.

3.0 SAFETY WARNINGSNO USER-SERVICEABLE PARTS ARE INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

THIS TRANSMITTER IS CLASSIFIED AS A LASER PRODUCT. USE OF CONTROLS, ADJUSTMENTS OR

PERFORMANCE OF PROCEDURES OTHER THAN THOSE SPECIFIED HEREIN MAY RESULT INHAZARDOUS RADIATION EXPOSURE.

CAUTION!

INVISIBLE LASER RADIATION WHEN OPEN AND INTERLOCKS DEFEATED, AVOID EXPOSURE TO

BEAM.

4.0 INSTALLATION PRECAUTIONSThe Series F-RF-TX (Transmitter/Receiver) is designed to be mounted in any EIA-standard 19-inch

telco rack or communication equipment cabinet. For safe operation follow these precautions when

installing the F-RF-TX Transmitter/Receiver.

1. The 12-24 screws supplied with the Transmitter/Receiver are the correct threading for standardEIA/TIA open 19-inch racks.

2. Use a #1 Phillips (cross-head) screwdriver and attach the mounting brackets to theTransmitter/Receiver with the included 8-mm M4 screws. The mounting brackets have multiple

mounting holes and can be rotated allowing for a wide variety of mounting options.


9/18


3. Hold the Transmitter/Receiver with attached brackets up to the rack and move it vertically untilrack holes line up with the bracket holes, then insert and tighten the four screws holding the

brackets to the rack.

WARNING

The rack or cabinet should be adequately secured to prevent it from becoming unstable and/or

falling over. Devices installed in a rack or cabinet should be mounted as low as possible, with the

heaviest devices at the bottom and progressively lighter devices installed above.

The F-RF-TX Series is Class 1 laser devices. Avoid direct eye exposure to the beam coming from the

transmit port!

CAUTIONS

1. Ensure the power source circuits are properly grounded then use the power cord supplied withthe Transmitter/Receiver to connect it to the power source.

2. If your installation requires a different power cord than the one supplied with theTransmitter/Receiver, be sure the cord is adequately sized for its current requirements. In

addition, be sure to use a power cord displaying the mark of the safety agency that defines the

regulations for power cords in your country. The mark is your assurance that the power cord

can be used safely with the Transmitter/Receiver.

3. When installing the Transmitter/Receiver, the AC outlet should be near theTransmitter/Receiver and should be easily accessible in case it must be powered off.

4. Ensure the Transmitter/Receiver does not overload the power circuits, wiring, and overcurrentprotection. To determine the possibility of overloading the supply circuits, add together the

ampere ratings of all devices installed on the same circuit as the Transmitter/Receiver and

compare the total with the rating limit for the circuit. The maximum ampere ratings are usually

printed on the devices near the AC power connectors.

5. Do not install the Transmitter/Receiver in an environment where the operating ambienttemperature might exceed 45C (113F).

6. Ensure the air flow around the sides and back of the Transmitter/Receiver is not restricted.7. Do not place the product on any equipment which may become hot. Make sure the ventilation

slots are not covered.

8. Do not stack anything on top of the product. Protect the product from moisture, and excessheat or equipment creating strong magnetic or electric fields (i.e. speakers.).

9. Disconnect the power cable from the AC supply if the product malfunctions.

5.0 PACKAGING CONTENTThe packaging includes the following parts:


10/18


1 x F-RF-TX

1 x Manual

1 x Power Lead - UK Plug - IEC Socket

6.0 PRODUCT SUMMARYThe THOR F-RF-TX is a 1310nm directly modulation optical transmitter that employs a high linearity

DFB laser from a world renowned manufacturer. The features of the unit include perfect

pre-distortion adjustment circuitry, a high quality APC laser, and an ATC closed loop control circuit.

All the operating parameters are controlled by a microprocessor. The unit features a front panel LCD

that displays relative operating data and signal fault information. The F-RF-TX series is designed and

manufactured with reliability in mind. By integrating the advantages of high end 1310nm lasers with

well tested and proven circuitry a highly reliable and stable transmitter is achieved. The F-RF-TXTransmitters are suitable for even the most demanding of applications. The unit features powerful

remote management features via SNMP. Remote management software is able monitor and report

on parameters such as RF level, output power, operating current, laser temp, laser cooling current,

power voltage, SBS, OMI, and RF operational mode.

Product features:

Dual Modulated RF driver with high efficiency laser pre-distortion adjustment circuitry. Fully automatic self-adjusting Optical Modulation Index (OMI) control with 20 manual preset

options. OMI control is achieved via Automatic Gain control (AGC) or Manual Gain Control (MGC)with adjustable presets. Under AGC selection the input range is 78dBuV-88dBuV and the system

index automatically remains optimum. Under the MGC setting the input range can be adjusted

from 75dBuV-90dBuV via the ATT control on the front panel.

Front panel has 20 preset OMI adjustment levels to ensure optimum modulation of optical signal.Under AGC setting the OMI index is automatically set at the ideal level. A Manual Gain Control

option is available manually change the OMI index if desired.

Automatically switching dual power supplies with two operating settings. The default setting is tohave one power supply running with the second as a cold backup. A second setting is to have both

power supplies working at the same time with one as hot backup. If primary power fails the unit

automatically switches to the backup. Switch time is less than 10us.

Fully automatic control of casing temperature ensures a long operating life of the laser. Casingtemperature is monitored and controlled by a microprocessor. Display screen shows the actual

operating temperature in real time. When casing temperature reaches 45C a backup fan

system automatically engages to cool the unit. When casing temperature drops to 35C the fans

automatically turn off to extend the operating life of the cooling system.


11/18


Carrier to noise performance(59 route PAL-DCTB=65dBCSO=60dB)

Link loss (dB) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

CL-870-2 53 52.5 52.0 51.6 51.2 50.4 50.1

CL-870-4 53 52.6 52.2 51.8 51.4 51.1 50.5

CL-870-6 54.1 53.7 53.2 52.6 51.9 51.1

CL-870-8 54.5 54.0 53.0 52.5 52.0 51.0

CL-870-10 56.0 55.0 54.0 53.0 52.0 51.0

CL-870-12 55.8 55.0 54.2 53.4 52.6 51.0

CL-870-24 55.0 54.0 53.0 52.0 51.0 50.0

CL-870-28 54.4 53.6 52.8 52.0 51.2 50.4

CL-870-32 53.5 52.5 52.0 51.0 50.0 49.0

7.0 INSTALLATION7.1 Rack Mounting1. Place the unit into a 19-inch wide rack or cabinet. Make sure to leave a 1.75-inch (about

4.5cm) space above and below the unit.

2. F-RF-TX optical transmitter can work under 0C~50C (32F~122F) temperature range. Werecommend 25C (77F) environment temperature.

3. Humidity should not be higher than 95% (under non-coagulation condition). If necessary,the equipment should keep the suitable temperature & humidity in the restrained scope.

We recommend to operating in the environment without dust.

4. Equipment should be powered by AC or steady voltage DC. In both of AC & DC, AC is themain power supply. Power supply recommendations:

AC input 94-245VAC, 50-60Hz

DC input 36-60VDC, floating

Power consumption Maximum 50W

5. The device should have a good grounding with resistance4. According to theinternational standard, 220V/240V plug in adopts tri-wire rule, the middle wire is the

grounding wire.

6. Before connecting circuit, please use high spec (#20AWG and more) electric wire toconnect the grounding screw on the bottom and the grounding frame. When use DC inputpower supply, the equipment chassis must be grounding.


12/18


7. The transmitter adopts high performance, high reliability, steady voltage switch powersupply; it has constant voltage overflow protection. It works in 110~254 VAC. The

micro-processor monitors the output DC voltage. If the fuse is overheated, it shows the

units inner parts has occurred problems.

8. In order to provide reflect loss 45dB, we use SC/APC connector; other type connectors(such as FC/PC) will not provide that value. Keep the connector clean when installing. Clean

it with degreased cotton with anhydrous alcohol after several plug-in/out.

9. Do not turn on the transmitter without protection cover at the fibre optic connector end.Otherwise the laser will do harm to human body especially eyes.

10. RF level decides the OMI (Optical Modulation Index) of the laser and the system index (CNR,CTB, CSO). When at 59 route PAL-D, its RF level is 20dBmV. Suppose channel is N, then:

Si(N)=20+10Lg(59/N) [dBmV]

11. CNR and Channel N: CNR(N)=CNR(59)+10Lg(59/N) [dB]

7.2 RF connectionConnect the RF cable & the connector on RX rear panel. RF connector is F type plug.

(F-Female/F-male Optional). The resistance is 75.

7.3 Optical connection1. Considering protection & safety of the equipment, all fiber optic connectors need to be

protected (covered) in transportation.

2. In order to provide an accurate insertion loss & return loss, the end-face of fiber opticconnector is polished to the highest level. Please DO NOT make the connector dirty or

polluted. Any micro dust will affect the transmission quality. When the unit is OFF and fibre

optic cable unplugged from it, please put on the protection cap.

3. Make sure all fibre optic patch cords are clean before connecting them to the transmitter.7.4 Cleaning GuidelinesFiber Patch cord connectors

1. Remove the fiber connectors dust cap and wipe the fiber connector tip with a dry lint-freecloth. Inspect for any scratches or debris on the connector surface by using a microscopes

(ie.100x or 200x).

2. If no scratches or debris are found, the connector is clean and ready for connection. Ifdebris or scratches are found, please repeat the fiber patch cord connector cleaning

guidelines.


13/18


Fiber Bulkhead connectors

1. Compressed air may be used to clean fiber bulkhead connectors. Use compressed air withat least the following specifications:

Non-residue, inert gas for precision dust removal, Ultra-filtered to < 0.2 microns, Recommended for optical systems, Using compressed air as listed above, remove the bulkhead dust cover and hold the

can of compressed air about 6 inches from the connector. After spraying a few short

bursts into the bulkhead, the connector is clean and ready for connection.

If compressed air is not available, the transmitter fiber bulkhead connector may be

cleaned by 2.5 mm cotton swap or connector plate may be removed to clean the internal

fiber patch cords.

2. To remove the transmitter optical connector plate, remove the screw on the far left of theoptical plate and remove the screw on the far right of the optical plate. Do not remove the

screws on the optical bulkhead connector.

3. Slowly remove the optical connector plate from the rear panel and disconnect each fiberconnector from the bulkhead mounted on the plate.

4. Clean each fiber connector according to cleaning guidelines.8.0 Transmitter ManagementThis section of the manual gives an overview of the available menus in the F-RF-TX series optic

transmitter and its description. The user scrolls through the menus using the push buttons found on

the front panel, these are located just to the right of the LCD screen.

8.1 Open menu1. Plug the transmitter into a power source and observe that the LEDs on the transmitter s

front panel indicate correct operation. Green LED confirms the transmitter is in

CAUTION: Use caution when handling fibers.

Do not exceed fiber manufacturers pulling tension or bend radius

specifications when removing fiber bulkhead connector plate.


14/18


operational mode. Red LED confirms there is a problem with laser operations. Flashing red

LED confirms the unit is in alarm mode. When the unit is in operational mode, there is a

message on the display: READY: KEY OFF.

2. In order to protect the laser, there is time-delay function, after turning on with the key;the laser will start to work after 10 seconds. The indicator will turn from Red into Green

light; the device enters into self-checking mode, after thatinto operational mode and it

displays Descriptor.

8.2 Start-up main menuPress\button will display below menu in sequence.

Menu # 1 -DESCRIPTORRead-only menu, it displays the transmitters model number

Menu # 2 - LD POWERRead-only menu, it displays the optical output power in dBm

Menu # 3 - LD BIASRead-only menu, it displays laser bias temperature in C

Menu # 4 - LD TEMPRead-only menu, it displays the laser temperature in C

Menu # 5 - COOLING/HEATINGRead-only menu, it displays the amount of current that the Thermoelectric Cooler

requires to maintain the laser temperature at nominal 25 C

Menu # 6 - UNIT TEMPRead-only menu, it displays the system temperature

Menu # 7 - RF LVLRead-only menu, it displays the RF input level

Menu # 8 - RF MODECurrent RF mode, it displays AGC/Manual

If it appears RF Mode = AGC, it is in AGC mode If it appears RF Mode = Manual, it is in MGC modeMenu # 9 - +5V ReadsRead-only menu, it displays the voltage +5V

Menu # 10 - -5V ReadsRead-only menu, it displays the voltage -5V

Menu # 11 - +24V READSRead-only menu, it displays the voltage +24V


15/18


Menu # 12 - IPAdjustable list, it displays the IP address

Menu # 13 - S/NRead-only menu, it displays the transmitters serial-number

8.3 Menu assistant manual1. The original RF Mode =AGC, the OMI menu displays RF Mode= ;

At this time. If press "SELECT", display RF Mode= ;

Press ""or "", the menu display: RF Mode=Manual.

2. If it displays "INTERLOCK" and LED flashing in red, it means the remote point at

the back panel is lost.

3. If RF input level is too high, there will be alarm and LED flashing in red, switch

off the device and after a few seconds please switch it back on.

4. If +5V voltage (+5V READS) >0.5V alarm.

If -5V voltage (-5V READS) >0.5V alarm.

5. If any fault occurs, an alarm will come on (LED flashing in red), Microprocessor

will shut down (cut off) the laser automatically, and digital panel will display the

fault.

8.4 Selecting AGC ModeFor most applications, the desired mode is AGC ON. Variations in RF input level due to drift

and thermal changes in the equipment feeding the signal to F-RF-TX are compensated and

the signal from the other end of the link remains consistent.

To select the AGC ON mode, please refer to p 8.3.1.

When the input signal is at or near the nominal 15 dBmV levels, the AGC circuitry willinternally adjust to control the 1310nm Optical Transmitter modulation. If F-RF-TX sends

SNMP alarms: RF LEVEL LOW or it the LED bar shows RF level low, then you must either

adjust RF input level at the signal source or use MGC mode.

8.5 Selecting MGC ModeTo select the MGC ON mode (to turn off AGC mode), please refer to p 8.3.1.

Select the MGC mode if:

Your application has a desired variation of the input level to be passed onto the receive


16/18


end of your link.

Your application has an input that is too high level or too low level to allow AGC tocontrol it.

If you have less than 6 channels in your input RF signal. The AGC circuitry may read thelevels of the RF signals in error and overdrive the 1310nm Optical Transmitter circuitry

causing clipping distortions that create catastrophic signal impairments. When you

have less than 6 channels (90 MHz of occupied bandwidth) in the lower part of the

54-860 MHz range, please select MGC mode.

8.6 Adjusting Input Level for Reduced Number of RF ChannelsLaser transmitters are sensitive to both input (peak) level and the total power input.Designs are targeted at typical loading of about 60 channels. There is sufficient

headroom is the design to allow for significant variations in channel count (occupied

bandwidth) so as many as 130 channel input are not a problem and do not force a

reduction of the input level target from a nominal 15 dBmV level. (Reducing the level may

result in undesirable degradation of C/N.)

If you have significantly less than 60 channels occupied, i.e., below 20 channels or 120

MHz of occupied bandwidth, you may wish to increase the input RF level if your source

can supply the higher level to optimizing C/N and other performance factors.

Place the unit in MGC mode.

NOTE: You may receive SNMP alarm RF Level Low or RF LED bar shows RF Level low

when there is a small number of channels (small occupied bandwidth) input to CL-870-T,

even though the RF signal is at the desired level. The RF circuitry senses a wide bandwidth

and averages the signal level; when only a small portion of the bandwidth is occupied at

proper levels and the rest of that is unoccupied, the sensor circuitry reports a low level.

Adjust the source to supply the level noted in the table below.

Desired Input Level= Level of input signal at which AGC will work OK

Specified Input Level= Signal level for 59PAL channels at which AGC works OK. In our case

it is 15 dBmV

Actual Channel Count= Number of channels being input to the transmitter

Specified Channels= total number of channels. In our scenario it is 59

Formula: Desired Input Level = Specified Input Level - A, where A = 10 x Log (Actual

Channel Count/Specified Channels)


17/18


Specified

Channels

Actual Channel

Count

Specified Input

Level [dBmV] A

Desired Input

Level [dBmV]

59 1 15 -17.70852012 32.70852012

59 2 15 -14.69822016 29.69822016

59 3 15 -12.93730757 27.93730757

59 4 15 -11.6879202 26.6879202

59 5 15 -10.71882007 25.71882007

59 6 15 -9.927007613 24.92700761

59 7 15 -9.257539716 24.25753972

59 8 15 -8.677620247 23.67762025

59 9 15 -8.166095022 23.16609502

59 10 15 -7.708520116 22.70852012

59 11 15 -7.294593265 22.29459326

59 12 15 -6.916707656 21.91670766

59 13 15 -6.569086593 21.56908659

59 14 15 -6.24723976 21.24723976

59 15 15 -5.947607526 20.94760753

59 16 15 -5.66732029 20.66732029

59 17 15 -5.404030903 20.4040309

59 18 15 -5.155795065 20.15579507

59 19 15 -4.920984107 19.92098411

59 20 15 -4.69822016 19.69822016

59 21 15 -4.486327169 19.48632717

59 22 15 -4.284293308 19.28429331

59 23 15 -4.091241756 19.09124176

59 24 15 -3.906407699 18.9064077

59 25 15 -3.72912003 18.72912003

59 26 15 -3.558786637 18.55878664

59 27 15 -3.394882475 18.39488247

59 28 15 -3.236939803 18.2369398

59 29 15 -3.084540137 18.0845401459 30 15 -2.937307569 17.93730757

59 31 15 -2.794903178 17.79490318

59 32 15 -2.657020333 17.65702033

59 33 15 -2.523380718 17.52338072

59 34 15 -2.393730946 17.39373095

59 35 15 -2.267839673 17.26783967

59 36 15 -2.145495109 17.14549511

59 37 15 -2.026502876 17.02650288

59 38 15 -1.91068415 16.91068415

59 39 15 -1.797874046 16.79787405


18/18


59 40 15 -1.687920203 16.6879202

59 41 15 -1.580681549 16.58068155

59 42 15 -1.476027212 16.47602721

59 43 15 -1.373835561 16.37383556

59 44 15 -1.273993352 16.27399335

59 45 15 -1.176394979 16.17639498

59 46 15 -1.0809418 16.0809418

59 47 15 -0.987541537 15.98754154

59 48 15 -0.896107743 15.89610774

59 49 15 -0.806559316 15.80655932

59 50 15 -0.718820073 15.71882007

59 51 15 -0.632818355 15.63281836

59 52 15 -0.54848668 15.54848668

59 53 15 -0.46576142 15.46576142

59 54 15 -0.384582518 15.38458252

59 55 15 -0.304893221 15.30489322

59 56 15 -0.226639846 15.22663985

59 57 15 -0.14977156 15.14977156

59 58 15 -0.074240181 15.07424018

59 59 15 0 15

User manual for CATV RF fiber optic transmitter

Documents

Transcript of User manual for CATV RF fiber optic transmitter