Fiber Optic Receivers
Contents
1. Notes Limited Warranty Blonder Tongue Laboratories Inc BT will at its sole option either repair or replace with a new or factory reconditioned product as BT may determine any product manufactured by BT which proves to be defective in materials or workmanship or fails to meet the specifications which are in effect on the date of shipment or such other specifications as may have been expressly agreed upon in writing 1 for a period of one 1 year from the date of original purchase or such shorter period of time as may be set forth in the license agreement specific to the particular software being licensed with respect to iCentral hardware and software and all other software products including embedded software licensed from BT ii for a period of one 1 year from the date of original purchase with respect to all MegaPort IPTV products and fiber optics receivers transmitters couplers and integrated receiver distribution amplifiers including TRAILBLAZER RETRO LINX and TWIN STAR products as well as for DigiCipher satellite receivers and iii for a period of three 3 years from the date of original purchase with respect to all other BT products Notwithstanding the foregoing in some cases the warranty on certain proprietary sub assembly modules manufactured by third party vendors and contained in BT products and on certain private label products manufactured by third parties for resale by BT are of short2. The FOCN is specified to operate from 10 C to 55 C It should be mounted in an adequately ventilated area For a longer life span it should not be operated at the upper limit of the temperature range Installation in wet areas or areas of extremely high humidity should be avoided The FOCN should not be installed in areas that are accessible to children The FOCN may be installed and operated in any position on a flat surface The unit has two slots in the bottom plate to accommodate mounting hardware The unit should be mounted by sliding over one screw and then tightening the other screw If mounting requires a wood screw use 6 or 8 maximum pan head sheet metal screws These are commonly available at hardware stores If mounting with a machine screw to tapped holes use 6 32 pan head screws 12V Input gt Forward Return Receiver Transmitter Input Output Return Test Forward Test RF Input Output 7 Point 20dB Point 20dB 12V Input Optical Connectors The optical connectors are available in SC APC type terminations Powering Apply only 12 VDC to either the F connector closest to the top cover of the unit or through a power inserter in series with the Main RF output connector the F connector closest to the outside edge of the housing NOTE the center conductor of the F connector is and the shield is ground 3 FOCN Instruction Manual Specifications Forward
3. AS TO THE CONDITION DESCRIPTION FITNESS FOR A PARTICULAR PURPOSE MERCHANTABILITY OR AS TO ANY OTHER MATTER AND SUCH WARRANTIES SUPERSEDE ANY ORAL OR WRITTEN WARRANTIES OR REPRESENTATIONS MADE OR IMPLIED BY BT OR BY ANY OF BT S EMPLOYEES OR REPRESENTATIVES OR IN ANY OF BT S BROCHURES MANUALS CATALOGS LITERATURE OR OTHER MATERIALS IN ALL CASES BUYER S SOLE AND EXCLUSIVE REMEDY AND BT S SOLE OBLIGATION FOR ANY BREACH OF THE WARRANTIES CONTAINED HEREIN SHALL BE LIMITED TO THE REPAIR OR REPLACEMENT OF THE DEFECTIVE PRODUCT F O B SHIPPING POINT AS BT IN ITS SOLE DISCRETION SHALL DETERMINE BT SHALL IN NO EVENT AND UNDER NO CIRCUMSTANCES BE LIABLE OR RESPONSIBLE FOR ANY CONSEQUENTIAL INDIRECT INCIDENTAL PUNITIVE DIRECT OR SPECIAL DAMAGES BASED UPON BREACH OF WARRANTY BREACH OF CONTRACT NEGLIGENCE STRICT TORT LIABILITY OR OTHERWISE OR ANY OTHER LEGAL THEORY ARISING DIRECTLY OR INDIRECTLY FROM THE SALE USE INSTALLATION OR FAILURE OF ANY PRODUCT ACQUIRED BY BUYER FROM BT All claims for shortages defects and non conforming goods must be made by the customer in writing within five 5 days of receipt of merchandise which writing shall state with particularity all material facts concerning the claim then known to the customer Upon any such claim the customer shall hold the goods complained of intact and duly protected for a period of up to sixty 60 days Upon the request of BT the customer shall ship such allegedly non conforming o
4. Instruction Manual MAINTENANCE INSTRUCTIONS Cleaning If the units need to be cleaned avoid the use of all solvents and use low pressure clean air to remove loose dirt Use low pressure clean air to clear the connectors of any debris Dirty or scratched connector end faces will greatly reduce the unit s performance Foam tipped swabs such as the 2 5mm Mini Foam Swab offered by Fiber Instrument Sales P N F1 0005 may be saturated with denatured alcohol and inserted into the optical port for cleaning DO NOT INSERT A DRY SWAB INTO THE OPTICAL PORT AS THIS MAY DAMAGE THE FIBER END FACE Many fiber optic installations experience degraded performance due to dirty optical connector end faces The following procedure should be used to properly clean the optical connector end faces Connector Cleaning Required Cleaning Equipment e Kimwipes or any lens grade lint free tissue The type sold for eyeglasses work quite well e Denatured Alcohol NOTE Use only industrial grade 99 pure isopropyl alcohol Commercially available isopropyl alcohol is for medicinal use and is diluted with water and a light mineral oil Industrial grade isopropyl alcohol should be used exclusively e 30X Microscope e Canned Dry Air Directions for Cleaning 1 Fold the tissue twice so it is four layers thick 2 Saturate the tissue with alcohol 3 First clean the sides of the connector ferrule Place the connector ferrule in the tissue and apply pre
5. BLONDER One Jake Brown Road Old Bridge NJ 08857 1000 USA TON GUE 800 523 6049 e 732 679 4000 FAX 732 679 4353 www blondertongue com LABORATORIES INC INSTRUCTION MANUAL FOCN Series Fiber Optic Compact Node Model Stock No FOCN S45 201 7420A 1 FOCN S45 204 7420A 4 FOCN S45 205 7420A 5 Status Date Document No Issue No Author Active Sepetember 28 2010 651215000C 3 KK Obsolete May 15 2009 651215000B 2 KK MADE IN USA AR 2010 Blonder Tongue Laboratories Inc All rights reserved Specifications are subject to change without notice Trademarks are the property of their respective owner FOCN Instruction Manual AVOID EXPOSURE Warning The optical emissions from the units are INVISIELE LASER RADIATION EMMISSIONS INVISIBLE LASER RADIATION AVOID DIRECT EXPOSURE TO BEAM laser based and present eye hazards Follow all safety precautions Ss INVISIBLE LASER RADIATION EMITTED FROM END OF FIBER OR CONNECTOR Wavelength 1 3um Max Output 30 mW TO REDUCE THE RISK OF ELECTRICAL SHOCK DO NOT REMOVE COVER FROM THIS UNIT NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED SERVICE PERSONNEL Safety Precautions The optical emissions from the units are laser based Class IIlb and may present eye hazards if improperly used NEVER USE ANY KIND OF OPTICAL INSTRUMENT TO VIEW THE OPTICAL OUTPUT OF THE UNIT As always be careful when worki
6. DFB 4 8dBm 3mW 1310nm DFB 4 0dBm 2 5mW 1550nm Return Loss gt 50 dB with APC connector Optical Connector SC APC 8 APC FOCN Instruction Manual Operational Setup Receiver Forward Path The FOCN optical receiver as the last component in a specific optical link will provide carrier to noise performance and an RF output level that is dependent on several parameters The RF input level to the source optical transmitter and the optical input level to the FOCN basically determine the link performance Both the laser modulation and the receiver output level are basically limited by total power The RF input level to any optical transmitter is dependent on the number of channels being transmitted As the number of carried channels is lowered the RF input level to the transmitter can be raised This results in increased RF levels at the FOCN receiver This improves the carrier to noise ratio over the link Links should be designed and transmitters should be set up using values that represent the maximum number of channels likely to be carried The following chart assumes approximately 77 channels from 55 MHz to 550 MHz and digital loading from 550 MHz to 1000 MHz at 6dB below analog The RF levels are measured at 547 25 MHz Optical Received Approx Forward Approx RF Input Level Power T P T P Level Output Level 8 dBm 16V 6 dBmV 14 dBmV 6 dBm 25V 2 dBmV 18 dBmV 4 dBm 40V 2 dBmV 22 dBmV 2 dBm 63
7. If possible completely disconnect the unit from any power source If you have questions about laser safety procedures please call Blonder Tongue before powering your product Laser safety classes for the FOCN Class Wavelength Range Optical Power Accession Limits IIIb 180 nm to 400 nm Varies with 2 and exposure time 400 nm to 10 nm 0 5 Watt Storing the Unit If a unit is to be out of use for an extended period of time the following steps should be taken to ensure the preservation of the unit 1 The storage temperature range is 20 C to 70 C 2 A low humidity environment is preferable for long term storage 3 All connectors should be covered with active device receptacle caps FOCN Instruction Manual Description The Blonder Tongue FOCN is a high quality cost effective bidirectional CATV node featuring the latest optical receiver technology It is designed to operate with optical input levels ranging from 8dBm to 2dBm The FOCN has a forward bandwidth of 54 1000 MHz and 5 42 MHz Return with Optional Return Laser Transmitters FOCN Model Table Model Stock No Description FOCN S4S 201 7420 1 Rx Only No Return FOCN S4S 204 7420 4 Rx with 1310 nm 4 8 dBm DFB Laser FOCN S4S 205 7420 5 Rx with 1550 nm 4 0 dBm DFB Laser The FOCN comes with an AC adapter which operates on an input of 100 240 VAC 50 60 Hz and an output of 12 VDC at 1 25 Amps Installation Environmental Considerations
8. Optical Receivers RF Output Frequency Range 1 0 dB 54 1000 MHz NTSC Output Level 1 dBm optical input 28 dBmV 550 MHz Return Loss 14 dB min 16 dB typical Impedance 75 Ohm CNR 0 dBm optical input gt 53 dB CSO 1 dBm optical input gt 63 dBc CTB 1 dBm optical input gt 65 dBc Slope OdB RF Test Point forward 20 dB Type F Optical Wavelength 1280 1610 nm Optical Input Power Range 2 dBm to 8 dBm Return Loss gt 50 dB with APC connector Optical Input Power Test Point 1 V mW 0 1 V Optical Connector SC APC 8 APC NOTE Typical levels O dB slope to 1000 MHz with 8dBm optical transmitter with OMI 3 2 amp 77 NTSC channel loading to 550 MHz amp digital loading to 1000 MHz 6 dB below analog Electrical amp Mechanical Dimensions 3 H x 6 D x 2 1 H Weight 12 oz Operating Temperature Range 10 to 55 C temperature at the mounting plate Enclosure IP Rating IP20 Powering 12 VDC via external Power Supply included DC Ripple lt 50 mV Power Dissipation with return TX lt 7 W Return Optical Transmitters F P DFB Versions RF Input Frequency Range 1 0 dB 5 42 MHz NTSC RF Test Point return 20 dB external Type F Return Loss with Return TX Installed gt 16 dB within the Return Band Return Path NPR 15 dB min of NPR Range FP 37 dB NPR Threshold DFB 41 dB NPR Threshold Optical Optical Output
9. TORIES INC
10. V 6 dBmV 26 dBmV 0 dBm 1 0V 10 dBmV 30 dBmV 2 dBm 1 58V 14 dBmV 34 dBmV Although the node will operate at optical input levels as high as 2 dBm there is little improvement in the C Nperformance of the node at optical input levels above O dBm For optimum distortion performance it is recommended that the optical input to the node be kept at or below O dBm The FOCN s RF output is directly proportionate to the optical input level If lower output is desired the unit should be lowered by adding an in line pad to the RF output to reduce the output level This will maintain optimum C N performance This will also reduce the OMI of the return transmitter if so equipped The following chart shows the approximate C N performance at various input levels and channel loading This performance can vary considerably depending upon fiber and laser performance so it is presented as a design aid only TYPICAL C N vs INPUT LEVEL CM dB TTT TTT OPTICAL INPUT dBm 11Ch dig de 40 Ch r 24 Ch bir 10Ch 5 6 FOCN Instruction Manual Internal Adjustments The FOCN receiver has two user adjustments inside the unit One is used to change the Forward Receive level test point calibration between 1310nm and 1550nm optical input ranges The other is to set the OMI of the return band transmit ter if equipped this will be discussed later on The unit should not be operated for extende
11. ansmitting power to reach the receiver with the longest link Those with shorter links can be attenuated to lower the signal to a level the receiver can use To be sure the receiver is in the correct range use the Receive Test Point using a high impedance mul timeter The optimum range for the FOCN is 0 5VDC to 0 9VDC approx 3dBm to 0 5dBm Operation down to 8dBm is feasible with reduced performance If the Fiber run is less than a few kilometers then the optical signal must be lowered before the system can operate cor rectly Failure to lower the signal into the operating range of the receiver may cause an overloaded or distorted picture The easiest way to lower the signal is to use an optical attenuator If the signal getting to the receiver is to low but the correct power transmitter is being used please check the following 1 Be sure the fiber connectors are all of the same type All FOCN units are shipped with SC APC style connectors These will be green in color You can NOT mix green and blue connectors as the end terminations are different This can also result in low signal or snowy picture ST connectors are generally orange these are for use with Multi Mode and are not appropriate for broadband use 2 Broadband RF transmitters such as those made by Blonder Tongue require the use of Single Mode fiber Multi Mode fiber will not work Attempting to use Multi Mode fiber will result in low signal or snowy picture 8 FOCN
12. d periods with the top cover removed This is because of RF ingress and contamination from dirt or other objects When replacing the top cover be sure to firmly tighten all thumbscrews RF ingress or oscillation can be caused by loose screws The locations of the internal adjustments are shown in the following diagram Return Transmitter Setup The specification for the return band transmitter RF input level is 58 dBmV Hz measured at FOCN RF Out Port This value operates the system at NPR threshold The FOCN has an adjustable attenuator in the return path Also included is a 20 dB test point in the return path The single carrier equivalent of 57 dBmV Hz is 9 dBmV The return pad must be adjusted to set the carrier to 9 dBmV actual after the attenuator With a test carrier present at the port 19 dBmV max measure its level at the return 20 dB test point Adjust the pad for a 20 dB test point reading of 11dBmV return input External Test Points The FOCN has three external test points The received Optical Power test point is calibrated at 1V per mW 1310 nm it should be measured with a high impedance voltmeter This test point is for long term monitoring purposes as well as initial setup The optical power should be measured with a power meter at the time of installation The input test point is calibrated at the factory at 1310 nm The value at 1550 nm may be off by 15 due to diode variations The input test poin
13. er duration or otherwise more limited than the standard BT limited warranty In such cases BT s warranty with respect to such third party proprietary sub assembly modules and private label products will be limited to the duration and other terms of such third party vendor s warranty In addition certain products that are not manufactured but are resold by BT carry the original OEM warranty for such products The limited warranty set forth in this paragraph does not apply to any product sold by BT which at the time of sale constituted a Refurbished Closeout Product b BT will at its sole option either repair or replace with a new or factory reconditioned product as BT may determine any product sold by BT which at the time of sale constituted a refurbished or closeout item Refurbished Closeout Product which proves to be defective in materials or workmanship or fails to meet the specifications which are in effect on the date of shipment or such other specifications as may have been expressly agreed upon in writing for a period of ninety 90 days from the date of original purchase Notwithstanding the foregoing in some cases the warranty on third party software and on certain proprietary sub assembly modules manufactured by third party vendors and contained in BT products and on certain private label products manufactured by third parties for resale by BT are of shorter duration or otherwise more limited than the BT limited warranty for Refurbi
14. ng with optical fibers Fibers can cause painful injury if they penetrate the skin Laser Safety Procedures ALWAYS read the product data sheet and the laser safety label before powering the product Note the operating wavelength optical output power and safety classifications If safety goggles or other eye protection are used be certain that the protection is effective at the wavelength s emitted by the device under test BEFORE applying power ALWAYS connect a fiber to the output of the device BEFORE power is applied Power should never be applied without an attached fiber output If the device has a connector output a connector should be attached that is connected to a fiber This ensures that all light is confined within the fiber waveguide virtually eliminating all potential hazard NEVER look in the end of a fiber to see if light is coming out NEVER Most fiber optic laser wavelengths 1310 nm and 1550 nm are totally invisible to the unaided eye and will cause permanent damage Shorter wavelength lasers e g 780 nm are visible and are very damaging Always use instruments such as an optical power meter to verify light output NEVER NEVER NEVER look into the end of a fiber on a power device with ANY sort of magnifying device This includes microscopes eye loupes and magnifying glasses This WILL cause permanent irreversible burn on your retina Always double check that power is disconnected before using such devices
15. r defective goods freight prepaid to BT for examination by BT s inspection department and verification of the defect BT at its option will either repair replace or issue a credit for products determined to be defective BT s liability and responsibility for defective products is specifically limited to the defective item or to credit towards the original billing All such replacements by BT shall be made free of charge fo b the delivery point called for in the original order Products for which replacement has been made under the provisions of this clause shall become the property of BT Under no circumstances are products to be returned to BT without BT s prior written authorization BT reserves the right to scrap any unauthorized returns on a no credit basis Any actions for breach of a contract of sale between BT and a customer must be commenced by the customer within thirteen 13 months after the cause of action has accrued A copy of BT s standard terms and conditions of sale including the limited warranty is available from BT upon request Copies of the limited warranties covering third party proprietary sub assembly modules and private label products manufactured by third parties are also available from BT on request DigiCipher is a registered trademark of Motorola Corp Rev 0509 One Jake Brown Road ON BLONDER Old Bridge NJ 08857 1000 USA TONGUE 800 523 6049 e 732 679 4000 e FAX 732 679 4353 www blondertongue com LABORA
16. shed Closeout Products In such cases BT s warranty for Refurbished Closeout Products constituting such third party software third party proprietary sub assembly modules and private label products will be limited to the duration and other terms of such third party vendor s warranty In addition notwithstanding the foregoing 1 certain Refurbished Closeout Products that are not manufactured but are resold by BT carry the original OEM warranty for such products which may be longer or shorter than the BT limited warranty for Refurbished Closeout Products All sales of Refurbished Closeout Products are final To obtain service under this warranty the defective product together with a copy of the sales receipt or other satisfactory proof of purchase and a brief description of the defect must be shipped freight prepaid to Blonder Tongue Laboratories Inc One Jake Brown Road Old Bridge New Jersey 08857 This warranty does not cover damage resulting from 1 use or installation other than in strict accordance with manufacturer s written instructions ii disassembly or repair by someone other than the manufacturer or a manufacturer authorized repair center 111 misuse misapplication or abuse iv alteration v lack of reasonable care or vi wind ice snow rain lightning or any other weather conditions or acts of God OTHER THAN THE WARRANTIES SET FORTH ABOVE BT MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND EXPRESS OR IMPLIED
17. ssure to the sides of the ferrule Rotate the ferrule several times to remove all contamination from the ferrule sides 4 Now move to a clean part of the tissue Be sure it is still saturated with alcohol and it is still four layers thick Put the tissue against the end of the connector ferrule Put your fingernail against the tissue so that it is directly over the ferrule Now scrape the end of the connector until it squeaks It will sound like a crystal glass that has been rubbed when it is wet 5 Use the microscope to verify the quality of the cleaning If it isn t completely clean repeat the steps with a clean tissue 6 Mate the connector immediately Don t let the connector lie around and collect dust before mating 7 Air can be used to remove lint or loose dust from the port of a transmitter or receiver to be mated with the connector Never insert any liquid into the ports Connector Handling 1 NEVER TOUCH THE FIBER END FACE OF THE CONNECTOR 2 Connectors not in use should be covered over the ferrule by a plastic dust cap It is important to note that the inside of the ferrule dust caps contains a sticky gelatinous residue that is the by product of the making of the dust cap This residue will remain on the ferrule end after the cap is removed Therefore it is critical that the ferrule end be cleaned thoroughly BEFORE it is mated to the intended unit FOCN 9 Instruction Manual Notes 10 FOCN Instruction Manual
18. t reading will be considerably off if the input wavelength is 1550 nm and the internal jumper has not been changed The jumper is located inside the unit next to the receive level test point as shown above The position closest to the test point is for 1310nm and the position farther from the test point is for 1550nm The Forward Test Point is 20dB from the RF output of the receiver If the RF out is 28dBmV then the test point should be approximately 8dBmV The Return Test Point is 20dB from the RF input going to the return transmitter Optimal input should be 14dBmV so the test point should read 6dBmV FOCN 7 Instruction Manual System Setup amp Trouble Shooting Return Path Fiber 1310nm Q Return Receiver 6 Kilometers Fonward Path Fiber 1310nm Premise Node gay Splitter To other sites Fonward Transmitter Fiber Loss at 1310nm is 0 330 dB per kilometer and 1550 is 0 188 dB per kilometer Using this formula if the fiber run is 6 kilometers 3 73 miles then a 2dBm transmitter is required for the distance If the forward band is being split then the additional loss must be accounted for A fiber splitter generally splits the signal equally between each output If the forward path is to be split 4 ways then a transmitter with an output power of 8dBm will be required to travel the 6 kilometers If the links coming out of the splitter are different lengths then be sure to have enough tr
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