7225 Interfacility Link Installation and User's Guide
Contents
1. 41 5V Power 15VDC 360mA Po NotUsed PowerGround DC Rem Monitor Range gt 1 VDC Se ee Monitor Optical Power Alarm Sinks Current at Low Optical High Low Open Collector 2 RF Alarm Sinks Current at RF High Low Open Collector 3 3 Spare Not Used 7225 Receiver 9 Pin D Type Female 15V Power Not Used Power Ground RF Signal Strength Monitor Optical Power Monitor Not Used AGC Alarm Optical Alarm AGC Alarm Optical Alarm Not Used Figure 10 7225 Receiver Pinout OnePath Networks Proprietary Information 24 Document No 93 005 29 B 7225 Installation and Users Guide Gain Control 5 Gain Control The 7225 IFL unit requires no maintenance but the user can adjust the transmitter and receiver gain by 20 dB The gain can be between 0 to 20 dB All internal adjustments have been set up at the factory the only user adjustments are input and output RF signal levels accessible from the front panel and described in the following sections 5 1 Transmitter Gain Control Since Gain Control sets a constant input gain to the laser an initial setup is required to ensure the input signal level is not too high overdriving the laser or too low noisy These variations can be caused by changes in dish pointing rain fade or satellite channel loading or any other reason Since MGC sets a constant input gain to the laser an initial setup is required to ensure the input signal level is not too high o2. 13 Be Ze Panel eeneg eet EE 18 4 PROGUCES E 19 AVIS 1225 AP GS POCUC e 19 4 2 Model Dimensions ccccccccccsesssssceeceessnsnsceeceeseseseeescesesesseeeeseeesessseeeeceeeeesseeeeseseees 21 4 3 Alarms and Monitors Dnouts 22 Be Gea COMI OL DE 25 5 1 Transmitter Gain Control 25 5 2 Receiver Gain Control nnn E tvessusceebesetedel E ERS 26 6 POU le SOU gsi si ss castes ean sess ee 27 7 Appendix 1 Cleaning Fiberoptic Connections cssccssscsssscsssccsscccsssecsessscssscssesssees 28 8 Appendix II Installing a Standalone Unit csssccssscssssccsssscssscccssssscsesssssssssseseoes 28 OnePath Networks Proprietary Information 3 Document No 93 005 29 B 7225 Installation and Users Guide List of Figures Fis re L Option SUCKER TE 10 Figure 2 7225 IFL Transmitter Front and Rear Panel 11 Figure 3 7225 IFL Receiver Front and Rear Panel seeeeesseeeeeseseerrrsresresrerressrsrresresrerrrsrene 11 Figure 4 Transmitter Block Diagram eeeseeseesseesesressesrrsresressessrestertesresresteseesrsreesreereneesrene 12 Figure 5 Receiver e EE 12 Figure 6 Typical Application of a 7225 E LE ET 13 Basu Unit DIMENSIONS pni a a E R A RN 21 Figure NEE 21 Figure 97225 Transmitter Pinout pee s E a ERTE Ei e E E EEEE SS 23 Figure 10 7225 R ceivef e 24 List of Tables Tables k 7223 Transmiter EE 18 Table 2 7225 Receiv r LEDS E 18 Table 7225 TRIE RP en ET 19 able Ar 72250 Transm
3. If signal still not present then Transmitter input stage amplifier is defective Contact OnePath Networks No optical power LED 1 There is a break or severe bend in the fiberoptic cable Use an not illuminated optical power meter or another functioning receiver unit to verify optical power coming down the fiber 2 Optical power too low too many splits too long a distance thus exceeding optical budget System may still function without LED illuminated although at reduced performance 3 The transmitter is not functioning see above Optical power light Damaged leaky photodiode Unit may still function otherwise illuminated with contact Factory for service disconnected optical input OnePath Networks Proprietary Information 27 Document No 93 005 29 B 7225 Installation and Users Guide Appendix I Cleaning Fiberoptic Connections 7 Appendix 1 Cleaning Fiberoptic Connections The unit has an FC APC or other optional angle polished optical connector for very high optical return loss performance The units are specified into singlemode fiber i e 9 125 micron core diameter Full performance is specified only for low return loss optical plant meaning that the fiber must be fusion spliced and all connections or splices must have a return loss greater than 60 dB With these guidelines in mind link lengths beyond 20 kilometers DFB based products can be achieved with high performance Specific performance and or design assi
4. chassis The 7000S features hot swapping supplies may be installed and removed even during operation Each power supply is fully redundant and can power a completely loaded chassis on its own should its partner fail During normal operation the two units share the load by means of current steering diodes located on the rear panel 3 2 Panel Descriptions On the Front Panel of the 7225 IFL unit are two LEDs Both LEDs should be on when the unit is in use The following tables describe the LEDs Table 1 7225 Transmitter LEDs LED Name LED Function Indicates if the optical output power control is functioning Indicates if the RF signal is above the minimal level Table 2 7225 Receiver LEDs LED Name LED Function Indicates if the optical reception power is within limits Indicates if the RF signal is above the minimal level OnePath Networks Proprietary Information 18 Document No 93 005 29 B 7225 Installation and Users Guide Product Specifications 4 Product Specifications The following section details the e 7225 IFL specifications e Model dimensions e Pinouts e Alarms e Monitors 4 1 7225 IFL Specifications Table 3 7225 IFL RF Specifications IRF Characteristics Frequency Range MHz 950 2150 RF Total Input Power dBm RF Total Output Power dBm Tx Rx Gain Adjustability dB Manual Return Loss dB Input Power no damage dBm CNR dB 36 MHz Intermodulation Products dBc Flatne
5. lt a e A DIVISION OF ONEPATH NETWORKS cA DIGHT 7225 Interfacility Link Installation and User s Guide Copyright 2000 7225 Installation and Users Guide SAT LIGHT 7225 Interfacility Link Installation and User s Guide OnePath Networks Inc 600 College Road East Princeton New Jersey 08540 USA Tel 609 514 1800 Toll Free 1 800 OPNNET 1 Fax 609 514 1881 OnePath Networks Ltd Beck Science Center 8 Hartom Street Har Hotzvim P O Box 45092 Jerusalem 91450 Israel Tel 972 2 589 9888 Fax 972 2 589 9898 Website www onepathnet com e mail corporate onepathnet com This manual contains PROPRIETARY and CONFIDENTIAL information of OnePath Networks Inc Reproduction release to any third party or any other unauthorized use of any information contained herein is expressly prohibited 2 Document No 93 005 29 B OnePath Networks Proprietary Information 7225 Installation and Users Guide Table of Contents T Front Chapter saps ssseccacsstsiodassededacsitsscasvenst saasass aces sahiusedecssasaeesecbuuss tunsdeabssssdscacadssaansssvavasssaseu 5 1 1 Warranty and Repair Poliey etiier gie geesde 5 t2 E ERR 6 l Se Cert Cath OM E 6 TAS E EE H LS E le EE H 2 Introduction to the Series 7225 seesseseesoeseesossossoesossoesossoesosssesoessesosssesosesossessossessossessossesss 9 Ze BE 9 2 2 Prod ct baw INES sist ee EENEG 11 2 DOCK Di gtams E 12 PEET ETEC i EPALE E E S 13 Ss 1 Setting E EE
6. the 7000M chassis The 7000M backplane incorporates 6 slots each of which has its own 6 pin blank header associated with it Any monitor voltages to be measured may be done between the chassis ground and the required pin The pins are numbered as follows O00000 NURO OnePath Networks Proprietary Information 22 Document No 93 005 29 B 7225 Installation and Users Guide Product Specifications Table 4 7225T Transmitter Pinout Standalone Rackmount 6 Function Description 9 Pin Pin Back Connector Panel Connector KS Ee 15V Power 270 mA excluding LNB Drive Not Used Power Ground DC Return RF Signal Strength RF Signal Strength Indicator Monitor Range 2 5 0 5 VDC Measures Laser Optical Power Range 2 to 4 5V Measures Laser Bias Range 4 5 0 3V ee RF Alarm Sinks Current at RF High Low TTL LSR Alarm Sinks Current at loop unlock High Low TTL 9 IS E LNB Bias optional External LNB Bias Dependent on Order 7225 Transmitter 9 Pin D Type Male Not Used RF Signal Strength Monitor Laser Photodiode Current Monitor Laser Current Monitor AGC Alarm LSR Alarm Figure 9 7225 Transmitter Pinout gt with 40 dBm input OnePath Networks Proprietary Information 23 Document No 93 005 29 B 7225 Installation and Users Guide Product Specifications Table 5 7225R Receiver Pinout Standalone Rackmount Description 9 Pin 6 Pin Back Connector Panel Connector
7. B Specific Product Warranty Instructions All OnePath Networks products are warranted against defects in workmanship materials and construction and to no further extent Any claim for repair or replacement of units found to be defective on incoming inspection by a customer must be made within 30 days of receipt of shipment or within 30 days of discovery of a defect within the warranty period This warranty is the only warranty made by OnePath Networks and is in lieu of all other warranties expressed or implied OnePath Networks sales agents or representatives are not authorized to make commitments on warranty returns C Returns In the event that it is necessary to return any product against above warranty the following procedure shall be followed a Return authorization is to be received from OnePath Networks prior to returning any unit Advise OnePath Networks of the model serial number and discrepancy The unit may then be forwarded to OnePath OnePath Networks Proprietary Information 5 Document No 93 005 29 B 7225 Installation and Users Guide Front Chapter Networks transportation prepaid Devices returned collect or without authorization may not be accepted b Prior to repair OnePath Networks will advise the customer of our test results and any charges for repairing customer caused problems or out of warranty conditions etc c Repaired products are warranted for the balance of the original warranty period or at lea
8. ax Cable Coax Cable Fiberoptic Cabl Fiber Output CEA Fiber Input 1 RF Output DC Power amp Monitors d 4 DC Power amp Monitors 7225T S 7225R Transmitter i Receiver Power Supply D N iJ Power Supply Figure 6 Typical Application of a 7225 IFL OnePath Networks Proprietary Information 13 Document No 93 005 29 B 7225 Installation and Users Guide Installation 3 1 1 Setting up the Transmitter 1 Place the 7225T in the 7000M Chassis The operating base plate temperature must be between 10 C to 55 C Apply AC power to the chassis The Power Supply s LED should be lit Mount the 7225T into the chassis The Laser LED should be lit Using an optical power meter measure the optical power Insert the meter s cable into the Transmitter s optical connector Power levels should be between 2 5 mW Alternatively use a DVM to measure the voltage at pin 1 of the 6 pin connector rackmount or pin 6 of the 9 pin connector standalone The power level should be 4 5 0 3 VDC On the rear panel connect the coax cable to the RF Input Connector On the rear panel connect the fiberoptic cable to the Optical Connector Adjust the Gain Control Potentiometer to give the desired output power Using a small screw driver turn the potentiometer located on the front panel to increase or decrease the gain To increase the gain turn the gain control clockwise To decreas
9. cument No 93 005 29 B 7225 Installation and Users Guide Trouble Shooting 6 Trouble Shooting The 7225 IFL was tested before it left the factory However if you are experiencing difficulties consult the list below for possible solutions If your system is still experiencing problems please attempt to isolate and identify the malfunctioning unit Table 8 Trouble Shooting PROBLEM POSSIBLE CAUSE 1 Laser LED not on No DC power to the unit Possible power supply problem or AC power input problem Check the fuse Verify LSRI monitor is between 4 8 and 4 5V If not laser may have overheated Disconnect power or remove plug in and allow to cool Try again with better airflow If an optical power meter is available measure the optical power out of the transmitter The power should be 0 3 mW to 0 6 mW If an optical power meter is not available then use another receiver to determine if there is optical power emerging from the transmitter use the 5 meter jumper cable If there is no optical power then the transmitter unit is malfunctioning If any or all the above are not within the guidelines the transmitter unit is faulty Lack of RF signal 1 If the unit has an LNB drive option verify that the correct present at Receiver yet LNB bias is coming down the center of the RF connector at the optical power is transmit site functioning 2 Verify that the dish is pointed and correctly receiving satellite signals Conclusion
10. e the gain turn the gain control counterclockwise For more information refer to Transmitter Gain Control on page 25 OnePath Networks Proprietary Information 14 Document No 93 005 29 B 7225 Installation and Users Guide Installation 3 1 2 Connecting the Fiberoptic Cable Before connecting the cable 1 Wipe the connector with a lint free cotton cloth 2 Note the polarity key of the optical connector before inserting To connect the cable 1 Line Up the Polarity Key a L S E FC APC Lf 2 Insert the connector _ one Tighten the connector LI 3 q KE N OnePath Networks Proprietary Information 15 Document No 93 005 29 B 7225 Installation and Users Guide Installation 3 1 3 Setting Up the Receiver 1 Place the 7225 Receiver in the 7000M Chassis The operating base plate temperature must be between 10 C to 55 C Apply AC power to the chassis The Power Supply s LED should be lit Mount the 7225R into the chassis On the rear panel connect the fiberoptic cable to the Optical Connector The Opt LED should be lit Using an optical power meter measure the optical power coming to the Receiver from the fiberoptic cable The power levels of the Receiver should be the power level measured at the Transmitter minus the fiber loss Alternatively use a DVM to measure the voltage at pin 6 o
11. el The input of the transmitter has an optional built in bias for inserting DC power up the coax to the LNB Make certain any equipment or test equipment connected to the transmitter input can withstand this bias The output of the receiver is AC coupled and can withstand the bias from a satellite receiver Do not exceed 25V DC bias Do not allow any dirt or foreign material to get into the optical connector bulkheads This may cause damage to the polished optical connector end faces The optical fiber jumper cable bend radius is 3 cm Smaller radii can cause excessive optical loss and or fiber breakage If multiple transmitters are installed in the chassis allow sufficient room for adequate ventilation otherwise the units may overheat causing possible safety hazard or equipment damage When several units are installed on one 7000M chassis ensure that the total units current including any LNB bias does not exceed 2A per power supply e g if there are two power supplies the current should not exceed 4A OnePath Networks Proprietary Information 8 Document No 93 005 29 B 7225 Installation and Users Guide Introduction to the Series 7225 2 Introduction to the Series 7225 The Sat Light 7225 IFL transmits an L Band RF signal over singlemode fiber from a satellite antenna LNB to control room equipment up to 65 kilometers away The 7225 IFL is a DFB high dynamic range link for applications that require either a higher qualit
12. f the D type connector The power level should be 1V to each 1 mW measured at the Receiver input On the rear panel connect the fiberoptic cable to the Optical Connector The Opt LED should be on On the rear panel connect the coax cable to the RF Output Connector Adjust the Gain Control Potentiometer to give the desired output power Using a small screw driver turn the potentiometer located on the front panel to increase or decrease the gain To increase the gain turn the gain control clockwise To decrease the gain turn the gain control counterclockwise For more information refer to Receiver Gain Control on page 26 gt Fiber loss is defined as attenuation km x length km of the fiberoptic cable 1 0 dB x number of connectors For example if a signal with an optical wavelength of 1310 nm is transmitted over a link 10 kilometers long which had two connectors the loss would be 0 4 dB km x 10 km 0 5 dB x 2 5 0 dB Alternatively if a signal with an optical wavelength of 1550 nm is transmitted over a link 10 kilometers long which had two connectors the loss would be 0 27 dB km x 10 km 0 5 dB x 2 2 7 dB OnePath Networks Proprietary Information 16 Document No 93 005 29 B 7225 Installation and Users Guide Installation 3 1 4 Measuring the RF Signal Strength The Receiver s RF signal strength can be monitored during operation via a DC RF signal strength monitor Maintenance personnel can per
13. form a simple verification process To measure the RF signal strength 1 Using a Digital Volt Meter measure the voltage at the connector pin 4 both Rackmount and Standalone 2 Refer to Receiver Gain Control on page 26 for further details regarding voltage levels 3 1 5 Powering the IFL e Transmitter power requirement 15 VDC 270mA excluding LNB Drive option e Receiver power requirement 15VDC 360mA e The Standalone Transmitter Receiver is powered by a user supplied external DC power supply e The Rackmount Transmitters Receivers are plugged into the rackmount chassis The chassis can accept and power up to six units At temperatures below 10 C the Transmitter s internal heater will require an additional 120 mA The Transmitter s total power requirement will then be 390 mA 7000M Chassis The 7000M Chassis provides power to the plug in units The power supply is a linear unregulated type Each plug in regulates its own voltage The 7000M provides 15 to 18 VDC unregulated 2 2 amps power H AC input 110 220 VAC user selected e Units can be plugged in hot standby e An internal 5 amp fuse OnePath Networks Proprietary Information 17 Document No 93 005 29 B 7225 Installation and Users Guide Installation 7000S optional Hot standby power supply For applications demanding the utmost in reliability and uptime the 7000S standby power supply can be optionally plugged in to the standard
14. itter PIM OUt EE 23 Fables 7225 ee Ee eal nd ecu eater ee 24 Table 6 Receiver RF Signal V Ota ce spuere gesongen subbeasalenes 26 Fable Trouble SHootin siii dshocseec ee ege Eeer 21 OnePath Networks Proprietary Information 4 Document No 93 005 29 B 7225 Installation and Users Guide Front Chapter 1 Front Chapter 1 1 Warranty and Repair Policy OnePath Networks performs testing and inspection to verify the quality and reliability of our products OnePath Networks uses every reasonable precaution to ensure that each unit meets specifications before shipment Customers are asked to advise their incoming inspection assembly and test personnel as to the precautions required in handling and testing our products Many of these precautions are to be found in this manual Nullification of Warranty The products are covered by the following warranties A General Warranty OnePath Networks warrants to the original purchaser all standard products sold by OnePath Networks to be free of defects in material and workmanship for one 1 year from date of shipment from OnePath Networks During the warranty period OnePath Networks will repair or replace any product that OnePath Networks proves to be defective This warranty does not apply to any product which has been subject to alteration abuse improper installation or application accident electrical or environmental over stress negligence in use storage transportation or handling
15. itter unit can provide 15 VDC for optional LNB powering 3 50 Q Input Output Impedance BNC RF connector Standard impedance is 75 Q F type female connectors are standard 4 Standalone unit The 7225 IFL can be installed as a standalone unit If the 7225 is used as a standalone a separate power supply must be used OnePath Networks Proprietary Information 9 Document No 93 005 29 B 7225 Installation and Users Guide Introduction to the Series 7225 On the side of the 7225T and the 7225R units is a sticker which lists options 1 to 3 Under each option is a square If the unit includes a particular option the square under the option should be marked For example in Figure 1 the LNB option is marked Options 1550 LNB 50Q 25 O C Figure 1 Option Sticker There are options on the sticker which are not relevant to the 7225 IFL OnePath Networks Proprietary Information 10 Document No 93 005 29 B 7225 Installation and Users Guide 2 2 Product Drawings Laser JoyMusuel ondowrq d Gain 7225T Figure 2 7225 IFL Transmitter Front and Rear Panel Id g u 2ndo q RF A9VAIDI9 Gain 7225R QO Figure 3 7225 IFL Receiver Front and Rear Panel Ov LJ CH Opt Out RF In IO O O Ee Opt In RF Out Na OnePath Networks Proprietary Information Introduction to
16. nd Repair Policy for further details 1 3 Certification The 7225 IFL has CE FCC FDA and UL certification OnePath Networks Proprietary Information 6 Document No 93 005 29 B 7225 Installation and Users Guide Front Chapter 1 4 Conventions In this manual the following special formats are used Note Notes contain information detailing the current topic CAUTION Cautions contain information regarding situations or materials which could damage your product WARNING WARNINGS CONTAIN INFORMATION REGARDING DANGEROUS FUNCTIONS 1 5 Precautions WARNING OPTICAL RADIATION APPLYING POWER TO THE TRANSMITTER UNIT WILL CREATE A LASER ENERGY SOURCE OPERATING IN CLASS I AS DEFINED BY IEC 825 1 USE EITHER AN INFRARED VIEWER OPTICAL POWER METER OR FLUORESCENT SCREEN FOR OPTICAL OUTPUT VERIFICATION AC POWER HAZARD THE RACKMOUNT POWER SUPPLY LINE IS EMI FILTERED AND FUSED THE CHASSIS IS CONNECTED TO EARTH GROUND IN COMPLIANCE WITH SAFETY REQUIREMENTS ALWAYS USE THE 3 PRONG AC PLUG WITH EARTH GROUND TO AVOID POSSIBILITY OF ELECTRICAL SHOCK HAZARD TO PERSONNEL OnePath Networks Proprietary Information 7 Document No 93 005 29 B 7225 Installation and Users Guide Front Chapter 1 5 1 Equipment Safety To avoid damaging your product please observe the following 1 Fuses To avoid possibility of fire hazard always replace fuses with the same type and rating of fuse as recommended on the power supply rear lab
17. ss dB 1 5 typical 2 0 dB max 0 25 max 36 MHz Optical Specifications Wavelength 1310 10 nm 1550 nm optional Optical Power Output Fiber Loss 0 4 dB km 1310 nm 0 27 dB km 1550 nm Optical Return Loss 60 dB Optical Connector Loss 0 5 dB mated pair Optical Budget 16 dB OnePath Networks Proprietary Information 19 Document No 93 005 29 B 7225 Installation and Users Guide Product Specifications Miscellaneous Power for Standalone Transmitter 15 VDC 270 mA 390 mA temp 10 C Receiver 15 VDC 360 mA Power for Rackmount max 110 or 220 VAC 50 60Hz 60 Watts Chassis Size 19 x 3U x7 Chassis Capacity 6 plug ins and 2 power supplies Unit Size 4 x 4 8 x 1 3 Optical Connector FC APC Operating Temperature Range 10 C to 55 C Storage Temperature Range 40 C to 85 C All specs are subject to change without prior notice OnePath Networks Proprietary Information 20 Document No 93 005 29 B 7225 Installation and Users Guide Product Specifications 4 2 Model Dimensions ge os Figure 7 Unit Dimensions 7 3 7 1 9 s 5 25 0 12 wld 3 6 FRONT VIEW apt a 18 2 REAR VIEW Figure 8 Chassis Dimensions OnePath Networks Proprietary Information 21 Document No 93 005 29 B 7225 Installation and Users Guide Product Specifications 4 3 Alarms and Monitors Pinouts The unit s pins are found at the backplane of
18. st 90 days from date of shipment D Limitations of Liabilities OnePath Networks s liability on any claim of any kind including negligence for any loss or damage arising from connected with or resulting from the purchase order contract quotation or from the performance or breach thereof or from the design manufacture sale delivery installation inspection operation or use of any equipment covered by or furnished under this contact shall in no case exceed the purchase price of the device which gives rise to the claim EXCEPT AS EXPRESSLY PROVIDED HEREIN ONEPATH NETWORKS MAKES NO WARRANTY EXPRESSED OR IMPLIED WITH RESPECT TO ANY GOODS PARTS AND SERVICES PROVIDED IN CONNECTION WITH THIS AGREEMENT INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ONEPATH NETWORKS SHALL NOT BE LIABLE FOR ANY OTHER DAMAGE INCLUDING BUT NOT LIMITED TO INDIRECT SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF OR IN CONNECTION WITH FURNISHING OF GOODS PARTS AND SERVICE HEREUNDER OR THE PERFORMANCE USE OF OR INABILITY TO USE THE GOODS PARTS AND SERVICE 1 2 Reporting Defects The units were inspected before shipment and found to be free of mechanical and electrical defects Examine the units for any damage which may have been caused in transit If damage is discovered file a claim with the freight carrier immediately Notify OnePath Networks as soon as possible Refer to Warranty a
19. stance is available by request from OnePath Networks If there is low no signal or noisy signal at a OnePath Networks module the connector should be cleaned Dirt on the inside connector tip can impair the flow of light causing problems in signal transmission OnePath Networks modules are sealed but dirt can occasionally enter during installation and alignment 8 Appendix Il Installing a Standalone Unit To install the 7225T STD or 7225R STD Standalone 1 Place the 7225 unit on the standalone flange matching the holes 2 Using four screws 4 or 6 secure the unit and the flange to the wall 3 Apply AC power to the standalone power supply unit 4 Connect the 7225 unit to the power supply The Laser LED should be lit All remaining steps are the same Refer to Setting up the Transmitter on page 14 and Setting Up the Receiver on page 16 OnePath Networks Proprietary Information 28 Document No 93 005 29 B
20. the Series 7225 11 Document No 93 005 29 B 7225 Installation and Users Guide 2 3 Block Diagrams LED Alarm d Monitor Optical Power Control A RF Signal Input Pad m gt Matching LED Monitor Alarm dH Vv RF SSI Figure 4 Transmitter Block Diagram Introduction to the Series 7225 Monitor E Alarm erly LED oe Power Optical Supply Control Signal t4 Output 4 Gain Variable TRANS IMPEDANCE AMPLIFIER 4 LED Monitor 4 Alarm Manual Gain Adjust Figure 5 Receiver Block Diagram OnePath Networks Proprietary Information 12 Document No 93 005 29 B 7225 Installation and Users Guide 3 Installation The following section details how to install the 7225 IFL units 3 1 Setting Up Setting up the 7225 IFL Transmitter Receiver consists of the following steps Setting up the transmitter Connecting the fiberoptic cable Setting up the receiver Monitoring the input output signals SE E Powering the IFL Installation Refer to Powering the IFL on page 18 for more details regarding power requirements Observe all warnings and cautions mentioned at the beginning of this manual page 7 If after set up you experience problems refer to Trouble Shooting on page 27 E Satellite Receiver Co
21. verdriving the laser or too low noisy These variations can be caused by changes in dish pointing rain fade or satellite channel loading or any other reason The signal level must be between 2 to SVDC To set the Transmitter MGC 1 Adjust the Gain potentiometer while monitoring the RF signal voltage The 7225 IFL is designed to provide optimal output at 4 0V 0 5V Therefore regardless of the input the Manual Gain Control should be set to provide this output 2 If there is input signal level variation expected it is best to leave some headroom should the signal level become too strong and result in distortion It is usually better to adjust the signal lower rather than higher Optical output refers to optimal CNR and IMD OnePath Networks Proprietary Information 25 Document No 93 005 29 B 7225 Installation and Users Guide Gain Control 5 2 Receiver Gain Control Receiver Gain Control allows the user to set the output signal levels The Gain potentiometer is adjusted while monitoring the voltage of the Receiver RF Sig Monitor Pin 4 on the 6 Pin Connector The chart below provides approximate settings for desired output levels Table 6 Receiver RF Signal Voltage5 RF Output Level dBm RF Signal Voltage Setting 10V 1 DN 0 5 1V 0 2 0 1V 0 02 The potentiometer is a 10 turn potentiometer 5 50 kilometers 16 MHz Total Output Power OnePath Networks Proprietary Information 26 Do
22. y link or transmission over long distances The 7225 IFL consists of an optical transmitter 7225T which receives the L Band signal from the LNB and an optical receiver 7225R which connects to a satellite receiver The 7225T and 7225R modules plug into a 7000M 3U chassis power supply which enables expansion of the system to accommodate any 6 Sat Light modules Accessories include the Model 7000S Standby Power Supply the Model 2000 1 1 Redundant Switch the Model 2100 Amplifier the Model 2200 Splitter and the Model 7050 Serial Optical Multiplexer an asynchronous data link The 7225 IFL transmits all satellite modulation schemes digital or analog Any FM modulated RF signal is transmitted faithfully The RF signal is directly modulated and adds virtually no phase noise to the original signal The direct modulation coupled with the 7225 Links RF circuitry guarantees superior signal quality Featuring a Multi Quantum Well MQW laser diode the 7225 IFL operates over a wide temperature range without needing to be cooled Slow start optical power control protects the laser from DC transients upon turn on Gain Control provides for optimization of the RF signal LEDs and back panel monitors and alarms allow for complete system status monitoring and for interfacing with M amp C systems Features 2 1 Options The 7225 IFL comes with a variety of options 1 1550 nm laser a 1310 nm laser is standard 2 LNB powering The transm
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