ViaLite Classic Wideband Link User Manual
Contents
1. 7 75 OdB loss reduces by 0 125 V dB loss N R S modules RLL voltage 4 00 OdB loss reduces by 0 075 V dB loss S U W modules For clarification see handbook section Alarms and Monitors Optical Connector FC APC Narrow key gt 60dB return loss Suhner FCPC Z M A601 Monitor amp Alarm Interface Rack plug in module 15pin female D type on 19 rack case backplane Shielded remote module 8pin female Lemo 1B Converter Sleeve 15 female D type Transmitter lt 4 5W Receiver lt 4W at 12VDC 0 5VDC Absolute Maximum RF Input RF in 15dBm 5VDC Optical gt 60dB return loss FC APC modules Suhner FCPC Z M A601 narrow keywidth connector E2000 APC modules Suhner FLSH 2000 A608 Use with other types may compromise system performance Operating Temperature Rack plug in module 0 C to 40 C OEM module 20 C to 50 C Shielded remote module 20 C to 50 C Storage Temperature 40 C to 70 C Wavelength 1310 20nm All parameters specified after 15 minutes warm up 4 2 Digital Signal Output Risc Full Time 10805 Optical loss budget HI modulation index 0 10dB optical loss budget LO modulation index 0 3dB optical loss budget Digital carrier suppression HI modulation index 55dBc Typ relative to RF carrier LO modulation index 70dBc Typ relative to RF carrier 20 5 Maintenance and Fault Finding Guide Refer to the following table that gives a list of commonly encountered problems and sugge2. A ViaLite Wideband RF Fibre Optic Link User Manual LRx R HB 10 CR2874 14 04 11 Pulse Power amp Measurement Ltd 65 Shrivenham Hundred Business Park Watchfield Swindon Wiltshire SN68TY UK Tel 44 0 1793 784389 Fax 44 0 1793 784391 Email sales ppm co uk www vialite co uk Instrument Care and Safety Information Please read the whole of this section before using your ViaLite product It contains important safety information and will enable you to get the most out of your link Electrical Safety The ViaLite Power Supply Units are Safety Class 1 products having a metal case that is directly connected to earth via the power supply cable When operating the equipment note the following e Hazardous voltages exist within the equipment There are no user servicable parts inside and the covers should only be removed by suitably qualified personnel e The equipment does not have an isolating switch on the mains inlets Equipment must be installed within easy reach of a clearly labelled dual pole mains isolation switch e Make sure that only fuses of the required rated current and of the specified type anti surge quick blow etc are used for replacement Optical Safety The ViaLite RF Transmitter modules contain laser diode sources operating at 1300nm These devices are rated at under IEC825 1 Safety Of Laser Products Part 1 First Edition 1993 as CLASS 1 radiation emitting dev
3. The switch to the left of the dotted line is internal to the module The circuitry to the right of the dotted line is provided by the system user In the presence of an alarm condition the module will act as a high impedance node and will NOT sink current This is a fail safe system in that an alarm condition will be raised when a module is not present This is an important factor when commissioning link management systems as blank module positions will register module faults Internal to External to module module VEXT Pull Up Resistor Alarm Ground lI his circuitry is also provided by the Redundancy Switch module and the Alarm Concentrator module When either of these modules are used the alarm outputs can not be considered VOLT FREE This is because the Redundancy Switch module and the Alarm Concentrator modules use the same module alarm outputs to detect whether a unit has failed When these modules are used a voltage of between 5V and 12V may be present on the Alarm output line when the module is in the failed mode When the module is working correctly the voltage on the Alarm output line will be 1 0 0 If true VOLT FREE contacts are required please consult PPM Maximum current 50mA Maximum voltage 15V 3 4 2 Module Monitor Output All modules also provide an analogue monitor output for monitoring the condition of the Optical transmitter receiver Details of the monitor can
4. 2 x optical loss dB where Optical loss connector insertion losses fibre losses 3 1 1 Optical Loss The additional electrical insertion loss in dB resulting from optical losses is equal to 2 times that of the optical loss in dB This is due to the physics of the optical to electrical conversion process in the receiver For example a 1dB increase in optical insertion loss will result in a 2dB decrease drop in RF signal at the output of the optical receiver For single mode fibre e g Siecor SMF28 the optical loss at the 1300nm operating wavelength of the ViaLite RF Analogue links is 0 4dB km This is increased if the fibre is under excessive tension compression or is bent into a small radius For clean undamaged single mode connectors the optical insertion loss is typically 0 4dB The losses at the optical connections at the Transmitter and Receiver are allowed for during manufacture of the module and may be ignored during link gain calculations For short links lt 250m containing no additional optical connectors and in which the fibre is not subject to any strain then the optical path loss can be ignored 13 3 2 Typical System Configuration The diagram below illustrates a typical transmission system configuration Transmitting Eqpt Receiving Eqpt ZOOS ZNIE CO ee ee SOA ROZ SOA ROZ ZIN PSN ets IB A ES SOA ROZ SOA ROZ Cross Site Fibre ViaLite Rack Opt
5. ij TRS Lir p 5 vik Na fe onio FSR des Ca fan Am Green Analogue Monitor Output OOOOOOO oloooooo 17 3 4 6 Mechanical Dimensions 128 4mm Shielded remote module Plug in module ge OEM module Contact PPM for detailed dimensions 18 4 Technical Specifications 4 1 RF and DC 10MHz to 3GHz Minimum Bandwidth 2kHz to 10MHz to 10MHz to 2kHz to 1 5GHz 1GHz 4 2GHz 4 2GHz RF Link Gain at OdB optical loss OdB 3dB Subtract 2 x Optical Loss dB for gt 0dB optical loss Optical Losses Fibre 0 4dB km typ Connectors 0 5dB per connector typ Gain Flatness 1dB 1dB 10MHZ to 3GHz 1 5dB 3GHz to 4 2GHz LRx Ux only 2 5dB 1 5dB 10MHZ Gain Slope lt 0 7dB 36MHz Gain Stability over Temperature lt 3dB over operating range Tx lt 0 05dB C below 40 C typ lt 0 08dB C above 40 C typ 0 03dB C typ Rx 2 4kHz bandwidth 40dBc IMD Indicates DC power is applied to the module Transmitter Status LED Green Transmitter laser functioning Red Transmitter laser degraded Receiver Status LED Green Received light level above threshold threshold factory set to nominal 20dB optical 40dB electrical loss Red Received light level below threshold Transmitter Alarm Outputs amp Monitors Current sink Laser Degraded Alarm Receiver Alarm Outputs amp Monitors Current sink Light Low Alarm Analogue Received Light Level RLL monitor RLL voltage
6. as the connector is mating To disconnect E2000 APC connectors depress the lever on the connector to disengage then withdraw the connector from the receptacle The shutter is spring loaded and should spring back to protect the ferrule 2 2 3 Care and Cleaning The optical connectors should be cleaned before each and every use even where they have been protected with dust caps Cleaning items required e Lint free fibre cleaning tissues normal cosmetic tissues produce dust and are not acceptable e Reagent grade Iso Propyl Alcohol e Air duster or FILTERED compressed air line Cable Connector Cleaning e Dampen patch of cleaning tissue with IPA and clean all surfaces of the plug ferrule e Using a dry cleaning tissue dry the ferrule and polish the end face e Using the air duster blow away any residue from the end of the connector Module Female Receptacle Cleaning only recommended if problems are being experienced e Twist a cleaning tissue to form a stiff probe and moisten with IPA Gently push the probe into the receptacle and twist around several times to dislodge any dirt e Repeat the above process with a dry tissue e Using the air duster blow away any residue from the receptacle Important Notes e IPA is flammable Follow appropriate precautions local guidelines when handling and storing e can be harmful if spilt on skin Use appropriate protection when handling e It should only be necessary to clean
7. mates with the connector on the back of the unit Push fully home and tighten the two fixing screws 2 1 2 Shielded Remote Modules The shielded remote modules are designed for use in electrically harsh environments and can withstand high electromagnetic fields Modules are powered using PPM mains power supplies of which screened and low cost versions are available The module is fully operational once power is applied and hence it is recommended that RF signal and optical connections be made before the unit is powered The module can be mounted in any orientation using the four fixing holes provided through the case 2 1 3 OEM Modules The small form factor OEM module allows System Integrators and Original Equipment Manufacturers an easy route to build RF optical interfaces into their own design Its small form factor and integrated design should allow the unit to easily be integrated into end user equipment 2 2 Fibre Optic Cable amp Connectors 2 2 1 Connector and Cable Types All ViaLite RF modules use singlemode 9um 125um cable terminated with either FC APC or E2000 APC optical connectors Cross site fibre optic cables are available from PPM in standard 3mm diameter and heavy duty 8mm diameter variants FC APC and E2000APC are standards for angle polished connectors and must not be confused with standard FC PC and E2000 connectors respectively The two connector types are not interchangeable and mating one with the other will
8. the female receptacles on the modules if problems are being experienced Never inspect an optical fibre or connector with the naked eye or an instrument unless you are convinced that there is no optical radiation being emitted by the fibre Remove all power sources to all modules and completely disconnect the optical fibres 2 2 4 Minimum Bend Radius Because the optical fibre is made of glass it is important not to subject it to excessive stress For this reason each type of cable has a minimum bend radius MBR specification beyond which the cable cannot be bent without damage occurring MBR specifications for PPM fibre are given in the ViaLite System Handbook Lxx HB 2 3 Using the Transmitter Module 2 3 1 Connecting the Module Connect the transmitter module to the power source cross site fibre optic cable and RF signal as described in section 2 1 The RF input signal applied to the signal connector should be within the maximum and minimum signal levels given in the technical specifications in the product datasheet This can be viewed or downloaded at the ViaLite website www vialite com 2 3 20 Front Panel Indicators The transmitter has two front panel LEDs for indication of the state of the module The following table shows the operation of the front panel LEDs NEN Upper LED Power Lower LED Status EN Standard Standard OFF Unit Off Unit Off RED Internal Fault Laser Failed 2 3 3 Alarms and Monitors Plug in Module
9. RF loss 10 2 5 Using the Digital Channel The digital channel is independent of RF transmission and is capable of transmitting up to 20kbps digital data simultaneously There are two built in digital interfaces one pin 2 and 3 for RS422 485 signals and the other pin 4 for RS232 TTL signals Only one interface can be used at a time If TTL signal is chosen it must meet gt 2 4 See connection details below Pin Number Transmitter Function Receiver Function 5 Module Alarm Output _ 00 Fw N T cE p meme o Beer Bis nt cpt Rese ai Ene Noni _ CL LL MEM Plug In module 15 way D connector pin out details of other pin outs in alarms an monitoring section The digital path in Tx and Rx can be disabled by applying 45V input on the relevant disable pins Connect them to ground or leave them floating will enable the digital channel Logic low on RTS_485 will shut down the RS422 485 line driver in RS485 application see relevant RS485 standard for detail Logic high on 485 or leave it floating will enable the line driver in the Rx module The digital information is convey on an FSK Frequency shift keyed carrier well below the operating band of the link at approx 500kHz The unit is fitted with internal filtering to heavily attenuate this signal at the electrical outputs It may however still be observed as a sideband second order when measuring higher frequency signa
10. Rack Unit containing Transmitter Module TT ViaLite Rack Unit containing Cable Receive Module Termination Box We will be considering the installation of the following system The signal must be conveyed over 1500m of fibre through a bulkhead at each station to the demodulator An alarm must trigger if the optical path is damaged 1 Install the link connecting all optical patchcords and cross site fibre optic cables Clean ALL optical connectors BEFORE mating with the module 2 Power up the equipment and allow 15 minutes to warm up 3 Ensure that the RF power into the transmitter module is set to optimum for your system Use a broadband RF power meter for this measurement 4 Calculate the approximate optical attenuation in the fibre path In our case we have two bulkhead connectors 0 4dB each 1500m of optical fibre 0 6dB giving a total of 1 4dB of optical loss The total RF gain of the system should be the nominal link gain minus 2x the optical loss 5 Confirm that the RF output from the receiver is correct to within measurement accuracy a couple of dBs If the loss is much higher than calculated the most likely explanation is dirt on the optical connectors If this is the case clean each connection in turn until the required system gain is restored 15 3 4 Alarms amp Monitoring 3 4 1 Module Alarm Output The circuit below shows how the alarm output should be configured for all types of ViaLite module
11. be found in the technical specifications in section 5 of this document 16 3 4 3 Module Alarm amp Monitor Connection Plug in Connection is made to the module by the 15 way D Sub connector on the rear of the rack backplane esssssee c Ce Feed opion 0000000 RC E 9 1r Digital Ch Disable opio 2 View looking into connector Alarm Output he 12V from rack supply 7 3 4 4 Module Alarm amp Monitor Connection Shielded Remote Connection is made to the module by the Lemo 1B 8 pole free plug on the rear of the rack backplane enone 2 RS8373 Dui e opi L3 Ground Pee Analogue Monitor Output Looking into panel Looking into mount socket Assembled plug 3 4 5 Module Alarm amp Monitor Connection OEM Connection is made to the module by the 14pin boxed header Molex C Grid III 0 1 dual row connector All OEM modules are supplied with a 250mm interface cable Pin Name Cable Function TX RX Colour TX422 Data Input Not connected opion 2 NC RX amp 2 Pink Nor connected RX422 Data Output option 3 DuX NC Pik TX422 Data Input Not connected option 4 Pink Not connected RX422 Data Output option 13 6 iced et E 0 Bk ee
12. damage both the cable and the module connectors The specification of the FC APC optical connector is critical to the performance of the complete fibre optic link System performance can only be guaranteed with fibre optic cables and connectors supplied by PPM 2 2 2 Connecting and Disconnecting Before connecting optical fibres to the module or to each other ensure that the mating connectors are clean see below 2 2 21 FC APC To connect FC APC optical connectors remove the dustcaps and align the white ceramic centre ferrule on the cable connector with the receptacle There is a lug on the side of the ferrule which must match the gap in the receptacle shroud When they are aligned gently push the plug home and finger tighten the knurled collet nut onto the threaded receptacle See Figure 1 below To disconnect FC APC connectors unscrew the knurled collet on the plug and gently withdraw the plug Replace the dustcaps on both the receptacle and the cable plug Figure 1 a showing FC APC connector with dust cap removed b showing alignment of the lug on the side of the ferrule which must match the gap in the receptacle shroud before gently pushing the plug home and finger tighten the knurled collet nut onto the threaded receptacle CH t E 2 2 2 2 E2000 APC To connect E2000 APC optical connectors simply push the connector positively into the receptacle until a click is heard The protective shutter will automatically lift
13. eeds Module Series OEM Modules Plug In Modules Product Name Special Options Product Series Standard amp Standard please contact PPM when Bandwidth Options ordering no part code exists External 36Vdc 330mA LNA feed allowed To enable No internal or external apply voltage to PIN 13 LNA feed offered of the 14 way header connector General Purpose N Series 10MHz 1 GHz Broadband R Series 2kHz 1 5GHz No OEM module No internal or external available LNA feed offered Factory option for feed external 36Vdc at 330mA max from PIN 14 of the 15 way D sub connector on chassis or converter sleeve No module No internal or external S Series Factory option for 1OMHz 3GHz feed internally generated 5Vdc feed 80mA Factory option for feed internally generated 12Vdc feed 9 80mA Wideband U Series 2kHz 4 2GHz No external LNA feed No internal or external allowed LNA feed offered Wideband Digital No internal or external W Series LNA feed offered allowed 2kHz 4 2GHz 12 3 System Integration 3 1 Link Loss Budget Calculations The link gain Transmitter RF input level to Receiver RF output level depends on the following factors e Optical loss due to connector insertion loss and optical fibre loss e Transmitter gain setting e Receiver gain setting The actual link gain can be determined as follows Link gain Nominal Link Gain
14. ic Cable ViaLite Rack Unit containing Unit containing Transmit Module Receive Module The link gain for the fixed gain systems depends solely on the loss through the optical fibre link from transmitter to receiver The makes the calculation of link gain a simple matter for calculation Link gain 2 x optical loss dB where the optical loss of individual components in the optical link fibre bulkhead connectors splitters etc can be calculated from the typical values shown in section 3 1 There is a Received Light Level RLL monitor output on the receive modules which can be used to measure the amount of laser light from the transmitter reaching the receiver during operation This feature 15 only available on plug in receiver modules The RLL threshold alarm which is triggered when the RLL drops below a preset level can be used to determine if the optical link has been damaged or degraded This is visible as an alarm on the front panel and an open collector alarm on the alarm concentrator connector see handbook Lxx HB 14 3 3 Commissioning of a Communications Link This commissioning procedure illustrates the processes required to install and set up a communications link with gain control The example describes the commissioning of a interfacility link but the technique can be applied to other module types Cable Termination Box Down Converter Demodulator Cross TO ED Site KOZ Cable ViaLite
15. ices When operating the equipment note the following e Never look into the end of an optical fibre directly or by reflection either with the naked eye or through an optical instrument e Never leave equipment with radiating bare fibres accessible always cap the connectors e Do not remove equipment covers when operating e Details of optical connections to the units compatible fibre types and care instructions can be found in the ViaLite system handbook Please read this section before using the link Adjustment maintenance and repair of the equipment should only be carried out by suitably qualified personnel For more information on the ViaLite range of products please refer to the generic ViaLite system handbook Lxx HB TABLE OF CONTENTS L INTRODUCTION Ee eene 5 2 SETTING UP AND UNDERSTANDING THE LINK 6 2 1 Module ES DU I I 6 2 2 Fibre Optic Cable amp CoBnectoES iod ds era 7 2 3 Using the Transmitter Module 1 ee RE nS ERE ERR yUPEE EUREN SE pM RR VERRE 8 2 4 Usmo the Receiver 10 2 5 Usmo the Dieital C Wane 11 2 6 LNA Beo a a aa 12 9 SYSTEM INTEGRATION itti eere eene 13 3 1 Link Loss Budget Calculations 13 3 2 Typical system 14 3 3 Commissioning of a Co
16. ls The signal will typically be a fixed level below the main carrier at all power levels see Digital carrier suppression specification for more details The 500kHz FSK tone can be removed by using the Digital channel disable FSK disable function on the module see details in paragraph above Two versions of the digital link are offered The HI modulation index version supports a higher path loss but has lower digital carrier suppression The LO modulation index version supports a lower path loss but has higher digital carrier suppression 11 2 6 LNA Feed All information in this section refers to fibre optic transmitter modules only LNA voltages are fed out through the RF input connector on the Tx modules OEM Modules Modules in this range DO NOT offer an internally generated LNA feed voltage Some modules do offer an ability to route a user fed LNA voltage through PIN 13 on the 14 way header details shown below When using PPM Outdoor Enclosure external LNA feed is available via the outdoor enclosure motherboard Plug In Modules Depending on product bandwidth type there are options for internally generated 5V or 12V LNA feed and options to route a user fed LNA voltage through PIN 14 of the rear 15 way D sub Connector details shown below It is not possible to route a user fed LNA voltage through PIN 14 of the rear 15 way D sub Connector on any modules that have been purchased with internally generated LNA f
17. mmunications Link ecce eee e eee e 15 3 4 Alarms X 16 4 TECHNICAL SPECIFICA TIONS eee eee eee eroe 19 4 1 0G 19 4 2 Dietak EE ec 20 5 MAINTENANCE AND FAULT FINDING GUIDE 21 6 PRODUCT WARRANUEYaicescstivees sexes eee eecevboee be eene oe eed eee epvE eto Pes 22 1 Introduction The ViaLite RF Links are a family of fibre optically coupled link systems designed for the transmission of wide bandwidth RF analogue signals over long distances in electrically noisy environments or in situations where the loss associated with coaxial cable can not be tolerated This handbook covers the following ViaLite RF Link part numbers e Transmitter units with part numbers starting o LRT Nx JOMHz to IGHz o LRT Rx kHz to 1 5GHz o LRT Sx 10MHz to 3GHz o LRT Wx 10MHZ to 4 2GHz including option for digital channel o LRT Ux 2kHz to 4 2GHz e Receiver units with part numbers starting LRR Nx 10MHz to 1GHz o LRR Rx kHz to 1 5GHz LRR Sx LOMHz to 3GHz o LRR Wx 1OMHz to 4 2GHz including option for digital channel o LRR Ux 2kHz to 4 2GHz e Optical fibre interconnects with part numbers F6 FC APC F7 E2000 APC A typical system operates as follows The users RF electrical signal is inpu
18. order and make all necessary adjustments and parts replacements during the Company s normal working hours provided that the Customer will pay at the rates currently charged by the Company for any replacements made necessary by accident misuse neglect wilful act or default or any cause other than normal use Claims must be made promptly and during the guarantee period IMPORTANT Please contact both your selling agent and PPM prior to returning any goods for Warranty or Non Warranty repairs Goods will not be accepted without a valid Goods Return Number GRN 22 ViaLite WIDEBAND RF FIBRE OPTIC LINK HANDBOOK LRX R HB ISSUE 10 CR2874 PULSE POWER amp MEASUREMENT LTD 201 1 NO PART OF THIS DOCUMENT MAY BE REPRODUCED OR TRANSMITTED IN ANY FORM WITHOUT PRIOR WRITTEN PERMISSION PPM LTD 65 SHRIVENHAM HUNDRED BUSINESS PARK SWINDON SN6 8TY UK TEL 44 1793 784389 FAX 44 1793 784391 EMAIL INFO WEBSITE WWW PPM CO UK
19. s Only The transmitter module has a single alarm which registers the status of the transmit laser Activation of this alarm registers an internal fault and the unit should be replaced with a spare and returned to your local PPM representative The alarm state mimics the condition of the front panel Status LED Since the alarm 1s logic high when activated and pulled low by a transmitter module in good health the alarm at that rack position will be activated until a working transmitter is inserted An unused rack position registers an alarm at that position This alarm condition can be masked if an LRK1S or LRK2S Rack Case is used Consult System Handbook Lxx HB for details 2 4 Using the Receiver Module 2 4 1 Connecting the Module Connect the receiver to the power source fibre optic cross site cable and RF signal as described in section 2 1 2 4 2 Front Panel Indicators The receiver has two front panel LEDs for indication of the state of the module The following table shows the operation of the front panel LEDs mE Upper LED Power Lower LED Signal oU Unit Off Unit Off Internal Fault Excessive Link Loss 2 4 3 Alarms and Monitors Plug in Modules Only The receiver module has one alarm and one analogue voltage monitor The alarm registers the status of the input light level When the optical power at the input of the receiver unit is above the alarm threshold equivalent to 20dB loss the alarm is activated A
20. s soon as the received light level is restored to a value above the threshold the alarm is reset The alarm state mimics the condition of the front panel Status LED Since the alarm is logic high when activated and pulled low by a receiver with a strong optical input signal the alarm at that rack position will be activated until a working receiver is inserted An unused rack position registers an alarm at that position This alarm condition can be masked if an LRKIS or LRK2S Rack Case is used Consult System Handbook Lxx HB for details There is also a Received Light Level RLL monitor on the backplane connector This enables the user to measure received optical power for each channel This can be done either manually or via a system management console if applicable connected to the rack case alarm connector See document Lxx HB for details of the alarm concentrator connector The RLL monitor gives an absolute measure of the optical power at the receiver module For modules with part numbers with an suffix 1 0MHz to 1 0GHz R suffix 2kHz to 1 5GHz and S suffix IOMHz to 3 0GHz pre year 2010 RLL 7 75V for a gain of OdB and reduces by 0 125V per dB of RF link loss due to losses in the optical path For modules with part numbers with an S suffix 2kHz to 4 2GHz year 2010 onwards U suffix 2kHz to 4 2GHz and W suffix 10MHz to 4 2GHz RLL 4 0V instead of 7 75V when gain OdB In this case RLL is reduced by 0 075V per dB of
21. sted solutions Possible Causes 12 LED 15 not illuminated on Power is not attached to the PSU Connect mains power to the PSU the Plug In PSU Fuse has blown in PSU Replace fuse Power LED does not light on Power source not connected Connect power source Shielded Remote Module Power LED lights up RED External Feed is in current limit Check external load Status LED lights up RED but RF Laser degraded Return to local PPM office signal is present Status LED lights up RED and no Low optical level at receiver Check optical link for breaks kinks RF signal is present Status LED lights up GREEN but Gain adjustment set too low Increase gain setting no RF signal is present RF feed not connected Check RF connections The ViaLite range of RF Analogue Transmit and Receive Modules are precision engineered and calibrated for optimum performance and accuracy before dispatch However in the event of any problems or queries arising about the equipment please contact PPM or your local agent 21 6 Product Warranty ViaLite products are guaranteed against production defects and faulty workmanship for a period of three years from the date of shipment at no cost to the customer Extended warranty options are available at the time of purchase Please note that the customer is responsible for shipping costs to return the unit to PPM The Company or its agents will maintain its products in full working
22. t to the Transmitter Module which contains RF signal conditioning and laser control circuitry The module modulates the intensity of a beam of light with the RF signal The light travels through an optical fibre to the Receiver Module The distance between transmitter and receiver can range from 10m to 10km depending on the system specified The Receiver Module converts the modulated light back into an electrical signal which is available at the output of the unit Care of fibre optic connectors NB When the fibre optic cables are not connected it is essential that the cable and equipment connectors are protected by the Dust Caps provided with the system Failure to do so may result in damage to the fibre ends which are critical to the system performance Please refer to section 2 2 for fibre optic cable handling details 2 Setting up and Understanding the Link This section describes the connections between your RF Fibre Optic Transmitter and Receiver Modules and the operation of both units in a system Please read fully document Lxx HB for information on installing your ViaLite equipment before commissioning your RF link system 2 1 Module Operation 2 1 1 Plug in Modules The Plug In modules are designed for use in PPM s ViaLite 19 rack case The module is powered from the rack case backplane and all connections are on the rear panel To fit the module slide it into the desired rack case position until the backplane connector
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