USER`S MANUAL - Communications Specialties, Inc.
Contents
1. FIBERLINK XA 1400A RA 1400 DC LEVEL TRANSMISSION USER S MANUAL y CS Communications Specialties Inc WORLD HEADQUARTERS 55 Cabot Court Hauppauge NY 11788 USA TEL 631 273 0404 FAX 631 273 1638 WWW http Awww commspecial com EMAIL info commspecial com Communications Specialties Pte Ltd 100 Beach Road 22 09 Shaw Tower Singapore 189702 TEL 65 6391 8790 FAX 65 6393 0138 EMAIL csiasia commspecial com P N 108216 Rev D Section I II III IV VI VII TABLE OF CONTENTS GENERAL INFORMATION Introduction Specifications OPERATING INSTRUCTIONS FOR XA 1400A Installation and Alignment Operating Pointers OPERATING INSTRUCTIONS FOR RA 1400A Installation and Alignment Operating Pointers FUNCTIONAL BLOCK DIAGRAM OF XA 1400A and RA 1400A POWER SUPPLY AND SIGNAL CONNECTIONS AND CONSIDERATIONS OPERATING INSTRUCTIONS FOR FIBER OPTIC CABLE OVERALL SYSTEM CHECKOUT AND TROUBLESHOOTING TECHNIQUES MAINTENANCE AND WARRANTY Returning Equipment for Repair Page 10 14 Entire Manual Copyright August 1998 All Rights Reserved 1 SECTION GENERAL INFORMATION INTRODUCTION The FIBERLINK XA 1400A is an analog transmitter that will convert a DC electrical input to modulated light which may then be applied to a fiber optic cable There are no operating controls on the unit The XA 1400A employs a linear voltage to frequency converter which results in pulses o2. LED glow dimly when a signal is applied Note that this is only true for an operating wavelength of 850nm Units at 1300 nm are totally invisible 5 Ifthe unit is an analog or video transmitter at 850 nm is there a continuous dim glow from the transmitting LED 6 Is the optical connector on the transmitter clear of any obstruction or minute dirt particles 7 Does it matter that the power ground and signal ground of many systems are common 8 Does the fact that the power ground signal ground and case are common cause a short circuit anywhere in the system 10 B Check Optical Connectors If stepped 906 type SMA optical connectors are being used with the model 6030 SMA adapter are the short plastic alignment sleeves normally supplied with the connectors being used If they are not present the system will not work properly 2 If SMA connectors are being used with the model 6030 adapter are they the correct size for the fiber being used 3 Are the ends of the connectors free of all dust or dirt If not gently clean the tip of the connector with a clean cloth or gauze moistened with alcohol 4 Is the fiber broken in the connector A quick inspection with an inexpensive jeweler s loop can determine this Nn Is the fiber protruding from the tip of the connector If so refinish ing will be necessary C Check Fiber Optic Cable 1 Is the fiber optic cable pulled too tightly around a sharp corn
3. to variations in input signal or output impedances the following procedure should be employed 1 It will be necessary to have a source of 15 to 25 volts DC or 14 to 18 volts AC 50 60 Hz to power the unit Connections for either power source are given in section IV As an alternative an XP 1000A plug in transformer may be used Be certain to make all connections carefully and to check that the correct pins are being used 2 Turn the full scale or span potentiometer fully counter clockwise 20 or 30 turns will achieve this 3 Connect the fiber optic cable from the transmitter to the receiver and an accurate multimeter to the BNC connector of the receiver Set the meter to the 10 volt DC range 4 With a 9 volt input to the transmitter adjust the full scale or span potentiometer until the output of the receiver is exactly 9 volts 5 This completes alignment of the RA 1400A The integral signal indicator LED on the RA 1400A will light when the internal F V circuitry of the unit is receiving signals from the companion XA 1400A transmitter and operating properly OPERATING POINTERS Output Signal Power Supplies Optical Fiber Resolution The output signal of the RA 1400A is provided by a low impedance driving circuit that is short circuit proof to ground Its impedance is adequate to drive loads of 10K ohms or more The power input to the RA 1400A is designed to accept AC or DC voltages In orde
4. R XA 1400A INSTALLATION AND ALIGNMENT The XA 1400A is supplied pre aligned for use with an input signal range of 0 to 10 volts DC It may be put into service by simply making the appropriate signal and power connections according to the information in section IV Installation of the XA 1400A is as follows 1 It will be necessary to have a source of 15 to 25 volts DC or 14 to 18 volts AC 50 60 Hz Connections for either power source are given in section IV Be certain to make all connections carefully and check that the correct pins are being used 2 Apply the DC signal to be transmitted to the BNC input connector Do not exceed the 10 volt maximum input as clipping distortion non linearity and even damage to the unit could occur 3 The XA 1400A is now ready for use 4 If desired an adapter may be connected to the input BNC connector to provide standard banana plug or copper wire input capabilities The integral signal indicator LED on the XA 1400A will light when the internal V F circuitry of the unit is operating properly OPERATING POINTERS Driving Signal The input to the XA 1400A is across a 10K ohm resistor This input can be any DC level from 0 to 10 volts It should be realized that any step change in input will take about 0 5 seconds or so to stabilize Transmitted Signal The XA 1400A utilizes a voltage to frequency converter that changes its rate as a function of applied input signal level As a result
5. e service loops or extra slack should be provided in any installation While excessive precautions are not necessary fiber optic cable should be treated with moderate care as it does contain thin fragile strands of glass To obtain best coupling to a fiber with SMA connectors when using the model 6030 SMA adapter it is advisable to hook up a complete system and assure that everything is operating properly following the directions in the model 6030 manual Then the optical connector should be tightened so that accidental jarring or vibration will not loosen it This procedure is not necessary for ST connectors SECTION VI OVERALL SYSTEM CHECKOUT AND TROUBLESHOOTING TECHNIQUES Occasionally during the installation of a fiber optic system difficulties arise that are the result of factors beyond the control of the installer These difficul ties are usually subtle and result from a less than thorough understanding of the unique nature of this electronic optical technology It is in an attempt to simplify the task of the installer that the following checkout procedure is included The procedure is in the form of an outline which should be followed until the difficulty is corrected A Check transmitter 1 Is operating power DC AC Voltages correct 2 Are the correct pins on the connector or terminal block being used 3 Is the correct signal level present at transmitter input 4 Ifthe unit is a transmitter does the transmitting
6. er 2 Is the correct fiber size being used with the correct transmitter receiver combination 3 Does the fiber pass light at all A small penlight or flashlight can usually be used for this test 4 Does the fiber have too much attenuation for the system The attenuation measured on the reel will always be different after the cable is installed 5 When using lengths shorter than 10 meters 30 feet overloading of the receiver may occur The shorter the length of the fiber the greater the possibility for this condition Be sure there is adequate attenuation in any system If this seems to be the case or if operation with a meter or so of fiber is required contact the factory D Check Receiver 1 Is the operating power DC AC voltages correct 2 Are the correct pins on the connector or terminal block being used 3 Is light coming out of the fiber optic cable This may be difficult to see in many cases but often a very dim glow is present Note that you can only see 850 nm light Other wavelengths such as 1300 nm are totally invisible 4 Is the optical connector on the receiver clear of any obstruction or minute dirt particles 5 Does it matter that the power ground and signal ground of many systems are common 6 Does the fact that the power ground signal ground and case are common cause a short circuit anywhere in the system 12 OVERALL FIBER OPTIC CABLE CONSIDERATIONS A Fiber optic cable con
7. es that electronic technology has to offer They have been designed for long reliable and trouble free service and are not field repairable Should difficulty be encountered Communications Specialties maintains a complete service facility to render accurate timely and reliable service of our products The only maintenance that can be provided by the user is to ascertain that optical connectors are free of dust or dirt that could interfere with light transmis sion and that electrical connections are secure All other questions or comments should be directed to our trained sales engineers or directly to our Customer Service Department 14 WARRANTY Communications Specialties Inc CSI warrants that for a period of three years after purchase by the Buyer all Fiberlink transmission systems will be free from defects in material and workmanship under normal use and service A Return Material Authorization RMA number must be obtained from CSI before any equipment is returned by the Buyer All material must be shipped to CSI at the expense and risk of the Buyer CSI s obligation under this warranty will be limited at its option to either the repair or replacement of defective units including free materials and labor In no event shall CSI be responsible for any incidental or consequential damages or loss of profits or goodwill CSI shall not be obligated to replace or repair equipment that has been damaged by fire war ac
8. f light being transmitted over the fiber optic cable The use of this type of pulse modulation eliminates the effect of cable length or LED aging as well as deterioration of optical connections on the overall accuracy of the system The RA 1400A is an analog receiver that will convert pulses of light from a fiber optic cable into an electrical signal that is a replica of the original DC input to the transmitter The RA 1400A employs a linear frequency to voltage converter and only has one operating control a full scale or span adjustment Both units feature integral signal indicator LEDs that can be used to continu ously monitor the operation of the system SPECIFICATIONS Complete System Response Time 0 5 seconds typical Transmitter Input Impedance eee 10 K ohms Receiver Load Impedance rnrrrrnrnrvrnrrnrnrenn 10 K ohms minimum Input Output Voltage Range eee 0 to 10 volts DE Resolution ssiisctcseiihaniedeencnaitenec 3 mv typical Emeanty sise en a aE E 3 typical DC Offset Stability ssorsnrrnrornrrvrnrnrrrnvernnrnr 100 ppm degree C typical Total Optical Attenuation 0 0 0 eeeeeneees 50u Fiber 0 10 dB 62 5u Fiber 0 15 dB 100u Fiber 3 18 dB Operating Wavelength rsrrorvrrrorrrnrrrrens 850 nm or 1300 nm Optical Connectors rsrnrrrrrnvrvnrrvrrrnrrrnrrrnnrnne ST Operating Temperature Range ee 0 to 50 degrees C SECTION II OPERATING INSTRUCTIONS FO
9. higher voltages will have more pulses per volt than lower voltage signals and resolution will tend to be better If at all possible try to scale inputs at the upper end of the input range Power Supplies The power input to the XA 1400A is designed to accept AC or DC voltages In order for proper operation the AC level should not drop below 14 volts rms or the DC level below 15 volts As long as this criteria is met unregulated power sources may be used To prevent damage voltages higher than 18 volts AC or 25 volts DC should not be applied Suitable voltages can be obtained from low voltage transformers or from an XP 1000A 115 to 16 VAC plug in adapter One side of the AC or DC input is connected to the case Optical Fiber The XA 1400A will properly drive most optical fibers with core diameters of 50 microns or greater The larger the diameter of the fiber the greater the amount of light applied to the fiber Single mode fibers cannot be used with this system A functional block diagram of the XA 1400A is given in Section III of this manual SECTION Ill OPERATING INSTRUCTIONS FOR RA 1400A INSTALLATION AND ALIGNMENT The RA 1400A will operate over the normal optical attenuation range specified in Section of this manual It may be put in service simply by making the appropriate signal and power connections per the information in Section IV In instances where the output signal span has to be touched up due
10. r for proper operation the AC level should not drop below 14 volts rms or the DC level below 15 volts As long as this criteria is met unregulated sources may be used To prevent damage voltages higher than 18 volts AC or 25 volts DC should not be applied These voltages can be obtained from low voltage transformers or from an XP 1000A 115 to 16 VAC plug in adapter One side of the DC input or AC input is connected to the case The RA 1400A will operate with optical fiber having core diameters from 50u to 100u in accordance with the published specifications When used with 100u fiber overloading will occur if the attenuation is less than 3 dB The system will not operate properly with single mode fibers The RA 1400A utilizes an active filter in its output network to remove the pulse repetition rate signal from the reconstructed DC output The primary noise component of the system are these residual pulses FUNCTIONAL BLOCK DIAGRAM OF XA 1400A Preamplifier Voltage Frequency LED Driver Converter Input aa H gt 7 10K MOV L Ds E FUNCTIONAL BLOCK DIAGRAM OF RA 1400A Preamplifier Frequency Voltage Output Driver Converter Output D Photo MOV Sf diode NW Span Adjust SECTION IV POWER SUPPLY AND SIGNAL CONNECTIONS AND CONSIDERATIONS The XA 1400A and RA 1400A are furnished with internal AC or DC power supplies Either one may be employed at the
11. tains an optical fiber with a light carrying core that is only 002 in diameter for 50 micron fiber This is smaller than a human hair Any small particle of dirt or dust can easily block this fiber from accepting or radiating light As a result the key word is cleanli ness Always use the dust caps provided with all optical connectors whenever they are exposed to air Also it is a good idea to gently clean the tip of an optical connector with alcohol whenever dust is suspected B Since the dimensions involved are so small any alignment sleeves or other devices supplied by the connector manufacturers must always be used C Mechanical butt splices optical feedthru mating sleeves must be installed properly The correct size for the fiber in use must be employed and any alignment devices such as the long bushings on stepped 906 type SMA connectors must be in place in order for the splice to operate properly Butt splices can easily add more attenuation than specified thereby preventing proper operation of a system D The element that determines the fiber size for a system is usually the receiver Be certain that 50 micron receivers are being used with 50 micron fiber Otherwise receiver overloading can occur Most transmit ters will drive any size fiber but this is not always the case SECTION VII MAINTENANCE The Fiberlink XA 1400A and RA 1400A have been manufactured using the latest semiconductor devices and techniqu
12. ts of God or similar causes or equipment that has been serviced by unauthorized personnel altered improperly installed or abused RMA numbers and repairs can be obtained from Communications Specialties Inc 55 Cabot Court Hauppauge N Y 11788 USA Tel 631 273 0404 Internet www commspecial com FAX 631 273 1638 Email info commspecial com Customers in the Asia Pacific Region should contact Communications Specialties Pte Ltd 100 Beach Road 22 09 Shaw Tower Singapore 189702 TEL 65 6391 8790 FAX 65 6396 0138 EMAIL csiasia commspecial com Please have your serial number available when contacting us 15
13. user s option Pin connections are as follows PIN FOR DC OPERATION FOR AC OPERATION A No Connection 14 to 18 volts 50 60Hz B 15 to 25 volts No Connection D DC Common AC Common E No Connection No Connection H No Connection No Connection Please note that the AC and DC common are connected to the enclosure The mating power connector for this system is an Amphenol 126 223 or equivalent The mating signal connector for this system is a standard UG 88 BNC connector For operation from 115V AC 60Hz a Fiberlink XP 1000A plug in adapter may be used This adapter is supplied with the appropriate connector installed SECTION V OPERATING INSTRUCTIONS FOR FIBER OPTIC CABLE The XA RA 1400A is supplied with ST type optical connectors and will operate with most common fiber optic cables Since the system operates at a wavelength of 850nm or 1300nm the fiber optic cable should be optimized for use at the correct wavelength Due to the small size of the actual optical fiber correct alignment is imperative especially when using the model 6030 SMA adapter When using stepped SMA connectors be certain that the plastic alignment sleeve is installed at the step Otherwise the system may not work properly When using any type of fiber optic cable be careful not to cause excessive strains especially at the cable to connector junctions Also do not subject the cable to sharp bends or pull around sharp corners Whenever possibl
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