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1. a a S OMI mW Wavelength Optical Power per Channel qBM l z R F Optics Inc Standard Receiver VXX _ A Mode RF Power OMI Total Relative Absolute Optical RF On Off No of Channels Input Output a fal le e J ay Figure 1 The FOS 1000A at Power Up Initial System Checkout cont Step 5 Turn the unit on Set the Rear Panel Power ON OFF switch to the 1 position ON Set the RED Front Panel Standby Power Switch to ON The LCD display should be lit and the sign on message shown in the figure will display fora moment The current software version is displayed in the lower right corner You will hear the internal attenuator adjusting for minimum attenuation since no modulated optical signal is connected to the unit CAUTION To prevent damage to the FOS 1000A Test Receiver s optical input and to ensure it remains free of dirt and dust do not remove the protective cover at this time Always make sure that the optical connector cover is in place when the unit is not being used FOS 1000A User s Manual WT S OMI mW Wavelength Optical Power per Channel daBM lt 13100m Absolute RFLOW A Mode RF Power OMI Total Relative Absolute Optical RF On Off No of Channels Input Output ol al T5 O F j2. FOS 1000A Fiber Optics Test Receiver System User s Manual Please Check the Addendum for CHANGE INFORMATION First Printing November 1996 Copyright 1996 2008 by RF Systems Inc San Jose California Printed in the United States of America All rights reserved Contents of this publication may not be reproduced in any form without written permission of RF Systems Inc Specifications and price change privileges are reserved FOS 1000A User s Manual Table of Contents Table of Contents i List of Illustrations iii Operators Safety Summary v Specifications 1 FOS 1000A Test Receiver System 1 Rear Panel Controls and Indicators 2 Mechanical Environmental Specifications 2 Receiving and Unpacking 3 Initial System Checkout 4 FOS 1000A Initial Turn on Procedure 4 FOS 1000A Test Receiver Operations Guide 7 FOS 1000A Introduction 7 FOS 1000A Front Panel Controls and Indicators 8 FOS 1000A mW dBM Selection 9 FOS 1000A Wavelength Selection 10 FOS 1000A Relative Absolute Mode Selection 11 FOS 1000A Normal Display Mode 12 FOS 1000A Relative Display Mode 13 FOS 1000A Relative Display Mode with Modulation Change 14 FOS 1000A RF Modulation Out of Range 15 Cleaning the Optical Interface of the FOS 1000A 16 FOS 1000A User s Manual Table of Contents cont Understanding the Communications Protocol For Optional Serial Interface General Command Response String Format Get Instr
3. Checksum Four Byte Hex ASCTI representation of the 16 bit binary word generated by adding all bytes of the Command String from the Start Byte through the end of the Data Field End Character ASCII CR Single Byte ASCII Carriage Return Character representing the end of the Command String Note The maximum length of the Command or Response String is 32 ASCI Characters 17 FOS 1000A User s Manual FOS 1000A Communications Protocol cont GETSTATUS Get Instrument Status Table 2 FOS 1000A Get Instrument Status Command String o s _ _ BL NA D cs START NODE DEVICE COMMAND CHECKSUM Tin fe MSs BYTE BYTES BYTES BYTE BYTES BYTE Table 3 FOS 1000A Get Instrument Status Response String 20Hex ft J n n STR B8 Na DA EE es w R are w BYTE BYTE3 BYTES BYTE Start Character CNTRL B Node Address Device Address Command Character Data Field Checksum End Character ASCII CR f Bit 0 Bit 1 Bit 2 Bits 3 7 n Byte 1 Byte 2 Byte 3 Single Byte Field indicating the start of transaction Two byte Hex ASCTI representation of the Node Address in the range 0 to 127 Two byte Hex ASCII representation of the Device Address in the range 0 to 127 By definition Device 0 is the Node itself Single Byte Character in the range of 20 Hex to 7F Hex 20 Hex is reserved for the Command Response Field from the Device or Node A Variable length Data Fie
4. ay Figure 2 The FOS 1000A after Initial Power Up Initial System Checkout cont Step 6 After the initial sign on message is displayed the normal power up mode displays will be as shown Press the Front Panel mW dBM push button once and notice that the LCD display changes accordingly Press the Front Panel Wavelength push button once and notice that the LCD display changes the wavelength displayed Press the Relative Absolute push button and notice that the displayed values change accordingly If these initial checks give the indicated results proceed to step 7 below Otherwise contact your Sales representative for instructions Step 7 Set the Front Panel Standby Power Switch to OFF Set the rear panel power switch to OFF Disconnect the unit from the AC MAINS You may now proceed to the section Using your FOS 1000A Test Receiver or continue on through the functional descriptions in the remainder of the introduction CAUTION To prevent damage to the FOS 1000A Test Receiver s optical input and to ensure it remains free of dirt and dust always make sure that the optical connector cover is replaced when the unit is not being used FOS 1000A User s Manual OMI mW Wavelength Optical Power per Channel GBM lt 13100m eee Absolute RFLOW A Mode RF Power OMI Total Relative Absolute Optical RF On Off No of Channels Inp
5. 127 By definition Device 0 is the Node itself Single Byte Character in the range of 20 Hex to 7F Hex 20 Hex is reserved for the Command Response Field from the Device or Node A Variable length Data Field up to 20 Bytes in Length depending on the Command Four Byte Hex ASCTI representation of the 16 bit binary word generated by adding all bytes of the Command String from the Start Byte through the end of the Data Field Single Byte ASCII Carriage Return Character representing the end of the Command String 20 FOS 1000A User s Manual FOS 1000A Communications Protocol cont GETRF Get RF Power Table 8 FOS 1000A Get RF Power Command String oT 12 34 s5 1o CR s NA DA PrP S START NODE DEVICE COMMAND CHECKSUM RETURN C e a T a E a T BYTE BYTES BYTES BYTE BYTES BYTE Table 9 FOS 1000A Get RF Power Response String o a a a d a 2 STA NODE DEVICE RESPONSE e CHECKSUM EEUN nE BYTES TOR nE SaR aie Sue Start Character CNTRL B Node Address Device Address Command Character Data Field Checksum End Character ASCII CR Single Byte Field indicating the start of transaction Two byte Hex ASCII representation of the Node Address in the range 0 to 127 Two byte Hex ASCII representation of the Device Address in the range 0 to 127 By definition Device 0 is the Node itself Single Byte Character in the range of 20 Hex to 7F Hex 20 Hex is reserv
6. Character in the range of 20 Hex to 7F Hex 20 Hex is reserved for the Command Response Field from the Device or Node Data Field A Variable length Data Field up to 20 Bytes in Length depending on the Command Checksum Four Byte Hex ASCTI representation of the 16 bit binary word generated by adding all bytes of the Command String from the Start Byte through the end of the Data Field End Character ASCII CR Single Byte ASCII Carriage Return Character representing the end of the Command String n The NEW Channel Count Sent Received Valid Count Range from 1 to 200 sS Channel Count Mode Status ASCII 0 Channel Count Was Invalid ASCII 1 Channel Count Was Received and Updated 26 FOS 1000A User s Manual The FOS 1000A Optical Input Attenuator Option Opt Attenuation Min O Max No of Channels 0 8 Opt Attenuation Min 0 0 Max Press here to increase Press here to decrease s the optical attenuation the optical attenuation N bg T Pa 4 K Figure 13 The FOS 1000A Front Panel with optional Optical Attenuator The FOS 1000A Internal Optical Attenuator Operation The figure above shows the FOS 1000A Front Panel with the Internal Optical Attenuator Installed Powering the FOS 1000A On Off is controlled by the rear panel AC Mains switch The Optical Attenuator is used to protect the optical detector from input overload when connec
7. F Optics Inc along with the return authorization number provided to you Once unpacked check the contents to make sure that you have received the following items e FOS 1000A Test Receiver Product e Accessory Adapter Kit if ordered e FOS 1000A User s Manual e AC Mains Line Cord e FOS 1000A Test Record Summary and Serial Number If any of these items are missing or you believe the FOS 1000A Product Options you received are not correct contact your Sales Representative immediately FOS 1000A User s Manual Initial System Checkout The FOS 1000A Test Receiver product can be powered and tested without actually making physical connections to a fiber network These checks should be made at the time your FOS 1000A Test Receiver Product is received from the shipper DANGER Although the FOS 1000A Test Receiver product does not emit harmful laser light on its own the normal connections to this device can have invisible laser radiation at optical powers and wavelengths of high enough level to cause permanent damage to the eye Do not at any time look into the exposed ends of fiber connectors bulkhead adapters or any fiber component carrying optical laser signals For the initial tests below the FOS 1000A Test Receiver does not need to be connected to the network WARNING To prevent potentially hazardous voltages from existing on the exposed metal parts of the equipment verify that the AC Mains Electrical syst
8. FOS 1000A Test Receiver System FOS 1000A User s Manual The following technical specifications apply to a properly operating FOS 1000A Test Receiver System Product after a 15 minute warm up period used with either 1310 nm or 1550 nm optical sources Front Panel Controls and Indicators Status Control Display Display Status Mode Selection mW dbM Wavelength Relative Absolute Number of Channels Display Status Modes Wavelength Mode Optical Power RF Power OMI per Channel OMI Total Internal Optical Input Front Panel Optical Input Adapter Optical Input Threshold Typical Measurement Threshold Standard with OPT 1 Optical Input Nominal Optical Input Maximum OMI Reading Accuracy RF Output Connector RF Output Return Loss RF Output Level above Threshold RF Output Correlated Noise Output RF Frequency Range Output RF Flatness Typical Internal Attenuator Range Internal Attenuator Accuracy Internal Attenuator Flatness RF Output Distortion Performance CSO CTB Optical Receiver Equivalent Noise Input 2 Line 48 character LCD with LED back light Front Panel SPST Push button Switch Front Panel SPST Push button Switch Front Panel SPST Push button Switch Three section BCD Push button Switch 1310 nm 1550 nm 20 nm Absolute Relative mW dBmW Estimated Carrier Power in dBmV 2 dB Measured in percent Measured in per cent FC APC accessible through the front panel SC APC Standard S
9. Node A Variable length Data Field up to 20 Bytes in Length depending on the Command Four Byte Hex ASCTI representation of the 16 bit binary word generated by adding all bytes of the Command String from the Start Byte through the end of the Data Field Single Byte ASCI Carriage Return Character representing the end of the Command String The NEW Wavelength Value Sent Received 1310 nm 1550 nm Wavelength Status Wavelength Was Invalid Wavelength Was Received and Updated 24 FOS 1000A User s Manual FOS 1000A Communications Protocol cont SETPWRMODE Set to New Optical Power Display Mode Table 16 FOS 1000A Set to New Optical Power Display Mode Command String m START N ODE DEVICE ae D P TEOST RETURN E BYTES BYTES R oe R P Table 17 FOS 1000A Set to New Optical Power Display Mode Response String o 12 34 5 J 6 7 su rR B Na pp if _s aaa _ roe pa 2 nae BYTES a ie BYTE BYTE BYTES BYTE Start Character CNTRL B Single Byte Field indicating the start of transaction Node Address Two byte Hex ASCII representation of the Node Address in the range 0 to 127 Device Address Two byte Hex ASCII representation of the Device Address in the range 0 to 127 By definition Device 0 is the Node itself Command Character Single Byte Character in the range of 20 Hex to 7F Hex 20 Hex is reserved for the Command Response Field from the Device or Node Data F
10. 000A Test Receiver to computer equipments having this type of interface For example an IBM PC or equivalent could be located within the same building as the FOS 1000A or used as part of an overall computer controlled test environment Both RS232 and RS485 Hardware protocols are supported The descriptions that follow are intended to provide the information necessary to allow programmers to develop device drivers which would allow communication with the FOS 1000A instrument and other computer software Tables 1 through 19 illustrate the communications protocol which must be followed in order to communicate with the FOS 1000A Test Receiver Table 1 FOS 1000A General Command Response String Format BYTES o 12 34 5 6N NHN Ns5 cmaracrer B ya ba w El _cs_ _cr_ DESCRIPTION NODE DEVICE COMMAND DATA CHECKSUM RETURN conr f i o o ea oa _ BYTE BYTES BYTES BYTE BYTES a a Start Character CNTRL B Single Byte Field indicating the start of transaction Node Address Two byte Hex ASCII representation of the Node Address in the range 0 to 127 Device Address Two byte Hex ASCII representation of the Device Address in the range 0 to 127 By definition Device 0 is the Node itself Command Character Single Byte Character in the range of 20 Hex to 7F Hex 20 Hex is reserved for the Command Response Field from the Device or Node Data Field A Variable length Data Field up to 20 Bytes in Length depending on the Command
11. A 250V slo blo lt 500 mAmps lt 400 mAmps lt 550 mAmps 10 D x 8 W x 4 75 H excluding handle 20 to 60 degrees C 0 to 50 degrees C All Standard Types Supported Must Specify at Time of Order 8 bits programmed internally RS232 or RS485 DB 9 Male RS485 DB 9 Female In the interest of continued product improvement these specifications are subject to change without notice FOS 1000A User s Manual Receiving and Unpacking These products are carefully packaged at the factory using specially designed shipping containers to prevent damage during shipment Once you receive your new FOS 1000A product be sure to inspect the shipping containers for damage prior to accepting delivery Containers that show signs of damage may contain equipment that has been damaged by the shipping company Should such damage be evident notify the shipping company immediately R F Optics Inc is not responsible for damage caused during shipment Carefully open the shipping containers and do not destroy them Remove the equipment and inspect it for damage Using the procedure outlined in the Initial System Checkout Section below test the system for proper initial operation If damage or defects are discovered notify your sales representative immediately You will be instructed on how to proceed Should the equipment need to be returned carefully repackage the equipment in the original shipping containers and return to R
12. FOS 1000A Test Receiver s optical input receiver Do Not drive the optical input port with greater than 3 dBmW 2 mWatts of Total Optical Power Care must be used in networks utilizing multiple wavelengths on a single Fiber Optic Cable that the Total Optical Power into the instrument does not exceed this value Optical Attenuators are readily available and can be used for measurements of higher Optical Powers FOS 1000A User s Manual OMI mW Wavelength Optical Power per Channel daBM x 1550nm 2 26qdBm 3 3 Absolute 29 50dBmV 21 3 A Mode RF Power OMI Total Relative Absolute Optical RF On Off No of Channels Input Output 0 18 15 F F Figure 6 The FOS 1000A Wavelength Select Push button FOS 1000A Test Receiver Operations Guide cont FOS 1000A Wavelength Selection When the FOS 1000A is powered on it comes up in the following default display mode Wavelength 1310 nm Optical Power Read in m Watts Display Mode Absolute To change the input Optical Wavelength Selection use the Wavelength Lambda symbol push button Optical Wavelength display mode will toggle between modes at each press of the push button In the figure above the Optical Wavelength has been toggled from the default power on mode of 1310 nm to 1550 nm In this mode the internal characteristics and cali
13. Interface of the FOS 1000A The Optical Input connector on the FOS 1000A was designed for simple removal to allow changing connector types or to clean the optical component inside the unit To remove the optical input assembly do the following Remove the two 2 56 Stainless Steel Machine Screws as shown in the figure Gently pull the assembly off of the front panel of the FOS 1000A revealing the internal optical connection and fiber Carefully remove the optical connector from the assembly and use appropriate care in cleaning Replace the optical connector on the assembly Gently place the assembly back into contact with the front panel and secure with the two machine screws CAUTION To prevent damage to the FOS 1000A Test Receiver s Front Panel Hardware use only the Machine Screws provided for this purpose Should you accidentally lose one of the mounting screws contact the factory for a proper replacement To prevent damage to the optical input components always make sure that the optical connector used matches the type on the units front panel is not scratched and has been properly cleaned before using Always remember to replace the optical input cover when the unit is not in use 16 FOS 1000A User s Manual Understanding the Communications Protocol For Optional Serial Interface Equipment The FOS 1000A Test Receiver is available with serial interfaces as an option This allows for connection of the FOS 1
14. TI representation of the 16 bit binary word generated by adding all bytes of the Command String from the Start Byte through the end of the Data Field Single Byte ASCI Carriage Return Character representing the end of the Command String The NEW Mode Value Sent Received Absolute Readings Relative Readings Mode Status Mode Was Invalid Mode Was Received and Updated 23 FOS 1000A User s Manual FOS 1000A Communications Protocol cont SETWAVELENGTH Set Wavelength to New Wavelength Table 14 FOS 1000A Set Wavelength Command String _ __ a BL NA pD w S START NODE DEVICE COMMAND WLENGTH CHECKSUM aT eO e a e aa ee O a BYTE BYTES BYTES BYTE BYTE BYTES BYTE Table 15 FOS 1000A Set Wavelength Response String ae a d a o o DA 2 20 Hex START Ni E M WENGI STATIS ARSE RETURN nae BYTES ae nae ai ae mE NE Start Character CNTRL B Node Address Device Address Command Character Data Field Checksum End Character ASCII CR w ASCII 0 ASCII 1 sS ASCII 0 ASCII 1 Single Byte Field indicating the start of transaction Two byte Hex ASCII representation of the Node Address in the range 0 to 127 Two byte Hex ASCII representation of the Device Address in the range 0 to 127 By definition Device 0 is the Node itself Single Byte Character in the range of 20 Hex to 7F Hex 20 Hex is reserved for the Command Response Field from the Device or
15. Test Receiver Operations Guide cont FOS 1000A with RF Modulation Out of Range The figure above shows the FOS 1000A connected to an optical network with near nominal optical input signal at 1310 nm The measurement mode is Absolute Note however that the RF Low annunciator has come on indicating that the RF Modulation signal is below the instruments measurement range Under these conditions the OMI readings will be blanked since a valid measurement cannot be made The point at which this occurs is referred to as the Optical Input Threshold and is defined as follows Optical Input Threshold is the point at which output level control occurs with 1 OMI based on 85 Channel loading Below this point all internal attenuation is minimum and total RF output power specified will not be achieved With 1 per channel OMI 85 Analog Channel loading this point is typically 2 0 dBm W Optical Input Threshold is a function of OMI and as a result will occur at different optical input powers OMI readings will not be valid at a point where the detected RF Level falls approximately 6 dB below the Optical Input Threshold and the OMI readouts will be blanked 15 FOS 1000A User s Manual Remove These Two Mounting Screws Only No of Channels Figure 12 Optical Interface Mounting Screws for Cleaning FOS 1000A Test Receiver Operations Guide cont Cleaning the Optical
16. al Power up The FOS 1000A Without an Optical Input The FOS 1000A Front Panel Controls and Indicators The FOS 1000A Default mW dBM Selection The FOS 1000A Wavelength Select The FOS 1000A Relative Absolute Mode Select The FOS 1000A Normal Display Mode The FOS 1000A Relative Display Mode The FOS 1000A Relative Mode Modulation Change The FOS 1000A RF Modulation Out of Range Cleaning the Optical Interface The FOS 1000A Front Panel with optional Optical Attenuator Programming the Internal Jumpers Setting Internal Programming Headers Setting the Internal Programming Switch S1 Setup of Test Equipment for Preliminary Calibration Setup of Test Equipment for RF Gain Verification Network Analyzer Settings for Flatness Main Control Board Connections for RF Gain Flatness Main Control Board Test Points and Adjustments 27 30 31 32 34 35 36 37 40 iii FOS 1000A User s Manual List of Illustrations and Tables cont Tables Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Table 7 Table 8 Table 9 Table 10 Table 11 Table 12 Table 13 Table 14 Table 15 Table 16 Table 17 Table 18 Table 19 FOS 1000A General Command Response String FOS 1000A Get Instrument Status Command String FOS 1000A Get Instrument Status Response String FOS 1000A Get Optical Power Command String FOS 1000A Get Optical Power Response String FOS 1000A Get OMI Command String FOS 1000A Get OMI Response Strin
17. ary word generated by adding all bytes of the Command String from the Start Byte through the end of the Data Field End Character ASCII CR Single Byte ASCII Carriage Return Character representing the end of the Command String 22 FOS 1000A User s Manual FOS 1000A Communications Protocol cont SETMODE Set New Instrument Mode Value Table 12 FOS 1000A Set New Mode Value Command String L o 12 34 5 6 70 u j 46 NA a F m S START NODE DEVICE COMMAND MODE CHECKSUM RETURN O e a e aa S ed a BYTE BYTES BYTES BYTE BYTE BYTES BYTE Table 13 FOS 1000A Set New Mode Value Response String L o 12 34 5 J 6 7 su r DA 20 Hex B Na pm fs aa a ee E nae BYTES BYTES BYTE BYTE BYTE BYTES BYTE Start Character CNTRL B Node Address Device Address Command Character Data Field Checksum End Character ASCII CR m ASCII 0 ASCII 1 sS ASCII 0 ASCII 1 Single Byte Field indicating the start of transaction Two byte Hex ASCII representation of the Node Address in the range 0 to 127 Two byte Hex ASCII representation of the Device Address in the range 0 to 127 By definition Device 0 is the Node itself Single Byte Character in the range of 20 Hex to 7F Hex 20 Hex is reserved for the Command Response Field from the Device or Node A Variable length Data Field up to 20 Bytes in Length depending on the Command Four Byte Hex ASC
18. as stored when the Relative Absolute push button was pressed Since the measurements are now relative to the same stored values the Optical Power RF Power readouts will be zero Note that the OMI readings did not change The user can now monitor the network for changes in optical power or RF Power over time Further since the OMI is a function of the Optical Transmitter only changes in Optical Power level will not change the OMI Changes in OMI however will also show a relative change in the RF Power level Hence the FOS 1000A can be used as a troubleshooting tool to help isolate technical problems in the telecommunications network between those related to the optical signal and those related to RF Modulation on the Optical Signal See the next section Relative Display Mode with RF Modulation Change 13 FOS 1000A User s Manual OMI mW Wavelength Optical Power per Channel daBM N 1310nm 0 01dBm 2 9 Relative 1 1dBmV 19 1 A l Mode RF Power OMI Total Relative Absolute Optical RF On Off No of Channels Input Output 0 18 15 F F Figure 10 The FOS 1000A Relative Display Mode with RF Modulation Change FOS 1000A Test Receiver Operations Guide cont FOS 1000A Relative Display Mode with RF Modulation Change As an example a reference condition was stored in t
19. ative Absolute used to change the Display Modes between Absolute and Relative No of Channels used to Program the unit for proper Optical Modulation Measurement Front Panel LCD Indicators Top Display Line Wavelength Optical Power Per Channel OMI in percent Bottom Display Line Display Mode RF Power Total OMI in percent FOS 1000A User s Manual OMI mW Wavelength Optical Power per Channel OBM oe S 1310nm 2 44dBm 3 3 Absolute 29 50BMV 21 3 A Mode RF Power OMI Total Relative Absolute Optical RF On Off No of Channels Input Output 0 18 15 F F Figure 5 The FOS 1000A Default mW dBM Selection FOS 1000A Test Receiver Operations Guide cont FOS 1000A mW dBM Selection When the FOS 1000A is powered on it comes up in the following default display modes Wavelength 1310 nm Optical Power Read in mWatts Display Mode Absolute To change the input Optical Wavelength Selection use the mW dBM push button Optical Power display mode will toggle between modes at each press of the push button In the figure above the unit has been toggled from the default power on mode of mWatts to dBmW In this mode the Optical Power will be read out in Power relative to 1 mWatt Below an optical power input of 20 0 dBmW the reading will be blanked CAUTION To prevent damage to the
20. based on the stored reference This reference is destroyed when the unit is powered off In the figure above the instrument is in the Relative Display Mode with respect to the unconnected power on condition which was stored when the Relative Absolute Push button was pressed The No Ref annunciator is on signaling that the RF Modulation signal was below the instruments measurement threshold when the relative mode was entered Under this condition the OMI readings will be blanked See the section RF Modulation Out of Range for more information 11 FOS 1000A User s Manual OMI mW Wavelength Optical Power per Channel OBM oe S 1310nm 2 44dBm 3 3 Absolute 29 50BMV 21 3 A Mode RF Power OMI Total Relative Absolute Optical RF On Off No of Channels Input Output 0 18 15 F F Figure 8 The FOS 1000A Normal Display Mode Absolute 1310 nm FOS 1000A Test Receiver Operations Guide cont FOS 1000A Normal Display Mode CAUTION To prevent damage to the FOS 1000A Test Receiver s optical input always make sure that the optical connector used matches the type on the units front panel is not scratched and has been properly cleaned before using Always make sure that the Total Optical Power of the network point being measured does not exceed the maximum optical power specified at
21. brations are set for 1550 nm The FOS 1000A Test Receiver s optical detection hardware will actually respond to Optical Signals in the range of 1290 nm to 1600 nm The instruments internal calibrations are factory set for greatest accuracy in the region of 1310 nm and 1550 nm respectively 10 FOS 1000A User s Manual OMI mW Wavelength Optical Power per Channel daBM lt 13810n1m Relative NoRef A l Mode RF Power OMI Total Relative Absolute Optical RF On Off No of Channels Input Output 0 18 15 F F Figure 7 The FOS 1000A Relative Absolute Mode Select Push button FOS 1000A Test Receiver Operations Guide cont FOS 1000A Relative Absolute Mode Selection When the FOS 1000A is powered on it comes up in the following default display modes Wavelength 1310 nm Optical Power Read in m Watts Display Mode Absolute To change between Absolute readings and Relative readings use the Relative Absolute push button In the Absolute measurement mode Optical Power and OMI are read out according to internal instrument calibrations When the Relative display mode is selected subsequent readings will be based on a reference stored at the same time the display mode is toggled This allows the user to reference to a particular point and then make readings
22. e Address in the range 0 to 127 Two byte Hex ASCII representation of the Device Address in the range 0 to 127 By definition Device 0 is the Node itself Single Byte Character in the range of 20 Hex to 7F Hex 20 Hex is reserved for the Command Response Field from the Device or Node A Variable length Data Field up to 20 Bytes in Length depending on the Command Four Byte Hex ASCTI representation of the 16 bit binary word generated by adding all bytes of the Command String from the Start Byte through the end of the Data Field Single Byte ASCII Carriage Return Character representing the end of the Command String 19 FOS 1000A User s Manual FOS 1000A Communications Protocol cont GETOMI Get OMI Table 6 FOS 1000A Get OMI Command String o J 12 34 5 69 1w CR Bp NA DA B S START NODE DEVICE COMMAND CHECKSUM RETURNU eM a g aa E E e a S a BYTE BYTES BYTES BYTE BYTES BYTE Table 7 FOS 1000A Get OMI Response String a TOTAL START N ODE VCE RESPONSE OMI aM S OMI vee KSUM RETURN te are are a NOR ER AR m Start Character CNTRL B Node Address Device Address Command Character Data Field Checksum End Character ASCII CR Single Byte Field indicating the start of transaction Two byte Hex ASCII representation of the Node Address in the range 0 to 127 Two byte Hex ASCII representation of the Device Address in the range 0 to
23. ed for the Command Response Field from the Device or Node A Variable length Data Field up to 20 Bytes in Length depending on the Command Four Byte Hex ASCTI representation of the 16 bit binary word generated by adding all bytes of the Command String from the Start Byte through the end of the Data Field Single Byte ASCII Carriage Return Character representing the end of the Command String 21 FOS 1000A User s Manual FOS 1000A Communications Protocol cont GETCALVARS Get Calibration Variables Table 10 FOS 1000A Get Calibration Variables Command String oT 12 34 5 1w 6 ____ B Na DA __ cs o E BYTES BYTES aa avis ae Table 11 FOS 1000A Get Calibration Variables Response String a a a o d 2 START Ni OBE M mme SOMTOR ESE RETURN nae BYTES m wE Ee ae mE NE Start Character CNTRL B Single Byte Field indicating the start of transaction Node Address Two byte Hex ASCII representation of the Node Address in the range 0 to 127 Device Address Two byte Hex ASCII representation of the Device Address in the range 0 to 127 By definition Device 0 is the Node itself Command Character Single Byte Character in the range of 20 Hex to 7F Hex 20 Hex is reserved for the Command Response Field from the Device or Node Data Field A Variable length Data Field up to 20 Bytes in Length depending on the Command Checksum Four Byte Hex ASCTI representation of the 16 bit bin
24. em is properly grounded Use only the AC Power cord supplied by the factory when making connections between the AC Mains and the equipment CAUTION To prevent damage to the FOS 1000A Test Receiver s optical input always make sure that the optical connector used matches the type on the units front panel is not scratched and has been properly cleaned before using Always make sure that the Total Optical Power of the network point being measured does not exceed the maximum optical power specified at the FOS 1000A input Refer to the section Cleaning the Internal Optical Connector for instructions on how to properly access and clean the units internal optical connector FOS 1000A Initial Turn on procedure Follow these simple steps to ensure that your FOS 1000A Test Receiver Product is functioning properly Refer to the figures that follow when instructed to verify that the units display is correct Step 1 Place the FOS 1000A Test Receiver product on a suitable surface for examination of all front panel controls and indicators Step 2 Verify that the Rear Panel Power ON OFF switch is set to the 0 position OFF Step 3 Using the AC power cord supplied connect it first to the unit then to the proper AC Mains receptacle Step 4 Verify that the RED Front Panel Standby Power Switch is set to OFF FOS 1000A User s Manual
25. g FOS 1000A Get RF Power Command String FOS 1000A Get RF Power Response String FOS 1000A Get Calibration Variables Command String FOS 1000A Get Calibration Variables Response String FOS 1000A Set New Mode Value Command String FOS 1000A Set New Mode Value Response String FOS 1000A Set Wavelength Command String FOS 1000A Set Wavelength Response String FOS 1000A Set Power Mode Command String FOS 1000A Set Power Mode Response String FOS 1000A Set New Channel Count Command String FOS 1000A Set New Channel Count Response String 17 18 18 19 19 20 20 21 21 22 22 23 23 24 24 25 25 26 26 FOS 1000A User s Manual Operators Safety Summary The general safety information in this part of the manual is for operating personnel Specific warnings and cautions may also be found in other areas of this manual where they apply Terms used in This Manual CAUTION statements identify conditions or practices that could result in damage to the equipment or other property WARNING statements identify conditions or practices that could result in personal injury or loss of life DANGER indicates a personal injury hazard immediately accessible through improper use of the equipment The AC Power Source The internal power supplies used in this product have been designed for failure free operation over the life of the equipment Failure to properly connect this equipment to AC mains can cause damage to the equipment and presen
26. he FOS 1000A by a technician in the morning and the instrument was left on as a monitor for changes which may occur later on The technician then left for several hours When the technician returned the displayed data was as shown above The figure now represents the displayed data for the optical network after a change had occurred The following observation was made The optical power was changed only slightly since the reference was stored This would indicate that the equipment generating the optical carrier was probably OK The Optical Modulation however had dropped by almost half a percent per channel in this 85 channel system This condition indicated a problem in the RF network feeding the optical transmitter itself and the technician started making inquiries as to possible changes made by other technical staff Later it was found that RF levels had been changed as part of a routine maintenance program without altering drive levels to the optical equipment at the site 14 FOS 1000A User s Manual OMI mW Wavelength Optical Power per Channel daBM 4 1310nm 2 43dBm Absolute RFLOwW A g Mode RF Power OMI Total i Relative Absolute Optical RF On Off No of Channels Input Output ol Jal 15 ra Figure 11 The FOS 1000A with RF Modulation Out of Range FOS 1000A
27. ield A Variable length Data Field up to 20 Bytes in Length depending on the Command Checksum Four Byte Hex ASCTI representation of the 16 bit binary word generated by adding all bytes of the Command String from the Start Byte through the end of the Data Field End Character ASCII CR Single Byte ASCII Carriage Return Character representing the end of the Command String Dp The NEW Optical Power Mode Sent Received ASCII 0 set units to m Watts ASCII 1 set units to dBm Watts s Optical Power Mode Status ASCII 0 Optical Power Mode Was Invalid ASCII 1 Optical Power Mode Was Received and Updated 25 FOS 1000A User s Manual FOS 1000A Communications Protocol cont SETCHANCOUNT Set to New Channel Count Table 18 FOS 1000A Set to New Channel Count Command String _ ay START N ODE DEVICE D COUNT CEG RETURN E BYTES BYTES cae Sits R P Table 19 FOS 1000A Set to New Channel Count Response String L o 12 34 s5 J J 69 1w unnu is BT Na DA 201x CHANNEL s CR NODE REMORSE o ZERA 2 iE BYTES ae nae ae RE oan ai Start Character CNTRL B Single Byte Field indicating the start of transaction Node Address Two byte Hex ASCII representation of the Node Address in the range 0 to 127 Device Address Two byte Hex ASCII representation of the Device Address in the range 0 to 127 By definition Device 0 is the Node itself Command Character Single Byte
28. ld up to 20 Bytes in Length depending on the Command Four Byte Hex ASCTI representation of the 16 bit binary word generated by adding all bytes of the Command String from the Start Byte through the end of the Data Field Single Byte ASCII Carriage Return Character representing the end of the Command String The Current User Front Panel Selections Optical Power Mode 0 mW 1 dBmW Display Mode 0 Absolute 1 Relative Wavelength 0 1310 nm 1 1550 nm Reserved Current Number of Channels Setting ASCII Hex Character 0 9 for the Hundreds digit ASCII Hex Character 0 9 for the Tens digit ASCII Hex Character 0 9 for the Ones digit 18 FOS 1000A User s Manual FOS 1000A Communications Protocol cont GETOP Get Optical Power Table 4 FOS 1000A Get Optical Power Command String o 12 34 5 69 1o CR s NA a a S START NODE DEVICE COMMAND CHECKSUM RETURN e e a y aa S a o a e a BYTE BYTES BYTES BYTE BYTES BYTE Table 5 FOS 1000A Get Optical Power Response String o J 12 34 5 69 wn 14 s nya D O o S oR START NODE DEVICE RESPONSE POWER CHECKSUM RETURN O oa S 2 f2 r e a e ee BYTE BYTES BYTES BYTE BYTES BYE Start Character CNTRL B Node Address Device Address Command Character Data Field Checksum End Character ASCII CR Single Byte Field indicating the start of transaction Two byte Hex ASCII representation of the Nod
29. nitor and measure Optical Modulation Index of an optical carrier in percent per channel or total Each value is conveniently displayed on the front panel while the modulation signal is within the units measurement range In addition system channel loading is easily programmed using the front panel BCD push buttons as shown See the text that follows for more detailed descriptions of the features and operations of the FOS 1000A FOS 1000A User s Manual OMI mW Wavelength Optical Power per Channel GBM lt 13100m eee Absolute RFLOW A Mode RF Power OMI Total Relative Absolute Optical RF On Off No of Channels Input Output gt a O OO 0 j ay Figure 4 The FOS 1000A Front Panel Controls and Indicators FOS 1000A Test Receiver Operations Guide cont FOS 1000A Front Panel Controls and Indicators Control of the FOS 1000A Test Receivers functional modes and displays is accomplished from the units front panel The following controls and display indicators are available Refer to the figure above while becoming familiar with the units controls and indicators Front Panel Controls mW dBM used to toggle the Optical Power Reading Units from mWatts to dBmWatts Wavelength Lambda used to toggle the Indicated Wavelength from 1550 nm to 1310 nm Rel
30. pecify at time of Order 2 dBmW Optical 85 Channels 1 OMI 3 dBmW Optical 79 Channels 3 50 8 dBmW Optical 79 Channels 3 50 0 dBmW 3 dBmW Optical 10 of the OMI Reading 0 2 75 Ohm BNC gt 15 dB 15 MHz to 860 MHz gt 12 dB 860 to 1000 MHz 2 dBmW Total RF Power No Attenuation lt 95 dBmW at RF Output 20 MHz to 1000 MHz 0 75 dB from 20 MHz to 1000 MHz 0 to 44 dB in 2 dB steps 0 25 dB from 20 MHz to 1000 MHz 0 25 dB from 20 MHz to 1000 MHz better than 70 dBc lt 8 pA per root Hz 15 MHz to 1000 MHz Note Optical Input Threshold is the point at which output level control occurs with 1 OMI based on 85 Channel loading Below this point all internal attenuation is minimum and total output power specified will not be achieved Specifications cont Rear Panel Controls Indicators AC Power Input and Fuse Power ON OFF Electrical Specifications AC Power Requirements Rear Panel Fuse DC Volts Required 5 Volts 15 Volts 24 Volts Mechanical Environmental Specifications Overall Dimensions Temperature Range no damage Operating Temperature Range Options and Accessories Optical Input Adapters Accessory Adapter Kit Remote Interface Baud Rates and port controls Serial Port 1 Serial Port 2 FOS 1000A User s Manual 110 220 Volts AC IEC Connector SPST Toggle Switch 110V 220V 50 60 Hz lt 25 Watts Total 85 to 250 Volts 1 0
31. t conditions which may place hazardous voltages on the metal chassis Should it ever become necessary to replace the rear panel fuse make sure that the equipment has been disconnected from AC mains power and observe the fuse specifications located on the back panel CAUTION To prevent damage to the equipment use only the factory supplied AC power cord and operate only from connections to the appropriate AC mains power sources WARNING To prevent potentially hazardous voltages from existing on the exposed metal chassis of the equipment do not use on ungrounded electrical systems General Precautions WARNING This equipment is intended for indoor use only Use in wet damp conditions may result in electric shock The FOS 1000A product is NOT intended for use in wet weather outdoors It is intended for operation in a horizontal position in the ambient temperature of a typical air conditioned communications equipment building Operating this equipment under other conditions may result in malfunctions or damage to the equipment Do not use in very high temperatures immerse in liquids or subject to other physical abuse Do not operate in an explosive environment To avoid personal injury do not remove covers or protective panels or operate the product without covers and protective panels installed Refer internal service and adjustment of this product to qualified factory personnel Detailed System Specifications Model
32. the FOS 1000A input The figure above shows the front panel display for an FOS 1000A Test Receiver connected to an optical network Note in the figure that the wavelength selected is 1310 nm and the display mode is Absolute The instruments internal calibration will be set to 1310 nm For this network the instrument is indicating that the Optical Power is 2 44 dBmW and is modulated with RF Signals which are within the measurement range The user has selected the proper number of channels as 85 on the 3 digit push button switch Under this condition the RF Power reading is approximately 29 5 dBmV 12 FOS 1000A User s Manual OMI mW Wavelength Optical Power per Channel daBM N 1310nm 0 00dBm 3 3 Relative 0 00dBmMV 21 3 _ A Mode RF Power OMI Total Relative Absolute Optical RF On Off No of Channels Input Output 0 18 15 F F Figure 9 The FOS 1000A Relative Display Mode FOS 1000A Test Receiver Operations Guide cont FOS 1000A Relative Display Mode The user wishes to monitor the optical network for changes from this reference condition This is easily accomplished by pressing the Relative Absolute push button once The front panel LCD now changes to indicate that the data currently displayed in Relative to some other input condition i e the condition that w
33. ting to high power devices Increasing or decreasing Optical Loss into the unit is controlled via the Front Panel Toggle Switch as shown Pressing the Right Half of the switch will increase attenuation see figure Continuously pressing the Right Half of the switch will increase attenuation until the maximum is reached Once the maximum attenuation is reached gt 35 dB the Max LED annunciator will light Pressing the Left Half of the switch will decrease attenuation Continuously pressing the Left Half of the switch will decrease attenuation until the minimum is reached Once the minimum attenuation is reached the Min LED annunciator will light The optical input reading is calibrated to take into account the small amount of optical loss in the attenuator at its minimum setting This allows the FOS 1000A to be used in conjuction with external Lab Quality attenuators when True Optical Power must be known When set to minimum internal attenuation the true optical power level is True Optical Power External Attenuator Setting Optical Power Reading on LCD 27 FOS 1000A User s Manual Addendum Information First Printing July 11 2008 Part Number RFO 017 00005 Revision 00 Changes Made August 2008 Removed Reference to FOS860A Updates Reason for Change Added revisions and corrections to headers only 28
34. ument Status Get Optical Power Get OMI Get RF Power Get Calibration Variables Set New Instrument Mode Value Set Wavelength to New Wavelength Set to New Optical Power Display Mode Set to New Channel Count The FOS 1000A Optical Input Attenuator Option The FOS 1000A Internal Optical Attenuator Operation Addendum Factory Setup for Calibration Procedures Servicing the FOS 1000A Programming the Internal Switches and Jumpers FOS 1000A Preliminary Tests Power Supply and Bias Tests Setup of Test Equipment for Calibration FOS 1000A RF Gain Amplitude Verification FOS 1000A Gain Flatness Setup FOS 1000A Gain Flatness Verification FOS 1000A Gain Flatness vs Attenuation FOS 1000A RF Voltmeter Amplitude Calibration FOS 1000A RF Gain Flatness with Optical Receiver FOS 1000A Final Test Procedure Preparation for Final Burn In FOS 1000A Final Calibration FOS 1000A Final Test and Verification Preparation for Shipment 17 18 19 20 21 22 23 24 25 26 29 30 33 34 35 36 37 38 38 38 39 40 41 42 17 27 27 28 29 33 39 FOS 1000A User s Manual List of Illustrations and Tables Illustrations Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17 Figure 18 Figure 19 Figure 20 Figure 21 The FOS 1000A at Power up The FOS 1000A After Initi
35. ut Output gt a O OO 0 Figure 3 The FOS 1000A Front Panel at Power up without an Optical Input FOS 1000A Test Receiver Operations Guide FOS 1000A Introduction The FOS 1000A is a high quality microprocessor controlled optical test receiver It was specifically designed to look like the typical wide band optical to electrical converter typical of those used in today s CATV CCTV Multi Channel or other high quality optical telecommunications networks As such the FOS 1000A can be used to simulate the optical receiver characteristics of an optical node greatly simplifying transmitter performance measurements and allowing for such measurement at the transmit site before any time consuming field checks are made In addition to the instruments low distortion portable optical receiver capabilities several additional features of the FOS 1000A simplify repetitive measurements otherwise requiring several other high cost instruments The FOS 1000A has the ability to measure Optical Power in mW or dBmW within the 1310 nm or 1550 nm optical windows Optical power is displayed on the front panel at all times in either absolute or relative modes Toggling between wavelengths power display or measurement modes is accomplished simply from the front panel using the three front panel push button switches shown in the figure above Unique to the FOS 1000A is it s ability to mo
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