Model 2808
Contents
1. Model 2808 CATVLinx PDS PNS CATV Receiver Product Technical Bulletin Carrier to Noise Ratio dB ic 7 f 36 KE 12 11 10 9 8 7 6 5 4 3 2 1 O 1 2 3 4 Receiver Optical Input dBm Figure 1 4 CNR vs Receiver Optical Input at 110 Channels The link CNR is usually specified for a received optical power of 3 dBm or more Thus a 2805TF SCSP 12 optical transmitter with an optical output of 12 dBm will provide optimal performance with up to 15 dB of optical loss at full channel loading If lower channel loading is used then the link can oper ate at higher optical losses and still provide exceptional CNR A number of curves are plotted the top curve is the typical result when only 5 channels are transmitted through the link It can be seen that very high CNR results and in fact the output is quite usable with receiver optical inputs as low as 12 dBm corresponding to 24 dB of optical loss As the channel loading gets higher the maximum achievable CNR drops 5 This product must be used only with APC type optical connectors or fusion spliced connections There is some folklore which suggests that the only critical backreflection is the one closest to the transmitter Our experience does not support that view We find that all backreflections matter regardless of their distance from the transmitter 6 The receiver is powered by an integral AC power supply that operates at 120 240 Volts AC 50 60 Hz A power cord is prov2. m E i E SC en mo A ES f u 153l dY 13431 WOiLdO NI 1VWOILdO POWER STATUS 120 240VAC RE 50 60Hz 150mA ATTENUATOR 4 e 7 R See ia TT ah UN a CATWLinx Model 2808 PDS PNS CATV Receiver lIOM2808 Revision 2 0 May 2004 CATV inx PNS PDS FIBER OPTIC RECEIVER PART NUMBER 2808R SFSP WAVELENGTH SERIAL NUMBER 1310 1550 nm 310023 W 825 Park Street Christiansburg VA 24073 http www forceinc com MADE IN USA Fi Force Incorporated Innovators of Multimedia Fiber Communications Instructions for Installation and Use Read this manual before installing or using this product Observe all safety warnings and cautions Copyright 2004 by Force Incorporated All rights reserved Force Incorporated reserves the right to make changes to the product described in this document in the interest of document improvement cE Force Incorporated Innovators of Multimedia Fiber Communications 825 Park Street Christiansburg VA 24073 TEL 540 382 0462 FAX 540 381 0392 USA 800 732 5252 sales forceinc com www forceinc com Model 2808 CATVLinx PDS PNS CATV Receiver Preface About this Manual This manual explains how to configure and install the Model 2808 PDS PNS CATV receiver It is intended for engineers and technicians who will install the 2808R receivers with companion transmitters Model 2804 see IOM2804 or Model 2805 see IOM2805 While th
3. access eemesntictiecrscaeiaeceneia deaione intel nesd EEEE NOE EER EE AEREE REEN 1 TPCC NOI Eo a a T A eee A 1 1 3 Optical Video Electrical Characteristics ccccccccccccceeseeeeeeeseeeeeeesuaeeeeeeaeeeeeeaneees 2 1 4 Environmental and Physical Characteristics ccccceeeeeeeeeeeeeeeeeeeeeeeeeeeeeaeeeeeees 2 eS CCIM ATOM NOTOS aese R E 2 Figure 1 1 RF Output Level Behavior of 2808R cceeeeeeeeeeeeeeeeeeeeeeeees 3 Figure 1 2 Detailed view of the 16 position digital rotary switch 3 Figure 1 3 Recommended Maximum RF Output Level vs Channel Loading 4 Figure 1 4 CNR vs Receiver Optical Input at 110 Channels cecceee 5 EOAPPIC ONS ee ene E E EE E A AE E E E E ee 5 Figure 1 5 Point to Multipoint Private Network Solution cceeeeetees 6 1 7 COPIA EN a CON Vite casratsecteateese iste oepnensnch eraseeriagesu psa e E edad 6 Section 2 Installation IMStructiOns 2 2 c0c0ceseeceeeeeeeeeneneeeeeceseeeeeeeecnseeeeeeeeenseeeeeeees 7 2 1 General Installation Requirements ccccceceeeeeeceeeeeeeeeeeeeeeeeeaeeeeeeeeesaeeeeeeeeasaeeees 7 DD tems Provided ainscoyscusantecnctantecdoeusaased so onde a e i iiaea 7 LS REGUE O ee EE N E E EEEE EEE E 7 De VS OC U Oe sts E genes eee ese eee ante ooide een becsonsteeteateaeeeaarcaee 8 2 5 Module PF lACCIN CIN je ckacaa2cossacerdeceeaiasedacenssaradansneaesdeaunaccandsancianiadaesabhesdesesidednnoussses
4. C power Check Tx AC power connec source to verify it is working tion Contact Force Inc if no cause for this problem can be found No optical power out of Tx If there is optical power at the Tx output verify proper fiber No optical power at the 2808 Check optical power output at is connected to the Rx If the proper fiber is connected ensure the integrity of the fiber See the transmitter IOM for input levels required for Check optical power at the proper operation Be sure to Rx ground the case of the Tx and Rx Also verity that all optical connections are APC type Signal out of 2808 Rx is noisy 14 Revision 2 0 Model 2808 CATVLinx PDS PNS Receiver Operating Instructions 3 7 ee See the transmitter IOM for input levels required for proper operation Verity the input signal at the No signal out of Rx Tx The Tx input must be within the specs given in the trans mitter IOM A larger signal will cause distortion Verify input signal at Tx Signal out of Rx is distorted Single mode fiber must be Verity fiber size used with this product Repair Service For equipment repair or technical assistance contact Customer Service 800 732 5252 USA or 540 382 0462 A Returned Material Authorization RMA number must be issued by Customer Service before the return of a failed unit Units should be returned in their original shipping carton if available Always include a com ple
5. ER 2808R SFSP WAVELENGTH 1310 1550 nm SERIAL NUMBER 310023 W POWER 120 240VAC 50 60Hz 150mA ATTENUATOR 13431 WoIlLdO Ei Force Incorporated lanevators of Multimedia Fiber Communications 825 Park Street Christiansburg VA 24073 http www forceinc com MADE IN USA Qv i 2 50 rs 16 DIA MOUNTING eee HOLES 4 PLACES A Optical In SC APC Standard FC APC Option timum the LED will turn yellow If the optical al Optical input to the receiver input rises above optimum the LED will turn red WARNING D RF Out F Connector RF output from the re Invisible laser radiation emitted from the fiber p o AEE ET E E E EA that attaches to this connector Avoid direct l 6 P nects the unit to any AC wall output eye contact with the beam F RF Attenuator 16 Position Rotary Switch Al lows the user attenutate the RF signal in 2 dB steps for optimum performance G Status 3 Pin Phoenix Connector Outputs in B RF Test F Connector Allows the user to mea sure the output RF levels 20 dB down from the primary output i i C Optical Level LED Tri colored LED When PO eau i a et green indicates the optical input is in the opti mum range If the optical input falls below op Figure 2 1 Model 2808 CATWLinx PDS PNS CATV Receiver g Dimensions in parentheses are in millimeters Revision 2 0 Model 2808 CATVLinx PDS PNS Receiver Inst
6. V Receiver working with either the Model 2804 PDS or 2805 PNS transmitter provides CATV distribution headend operators with an extensive array of features that offer a low cost solution to increase system performance The unit provides an RF output of 28 dBmV over the entire optical input range allowing multiple RF splits without the use of an external RF amplifier Additionally the receiver s ability to operate over a wide optical input range of 8 0 to 4 5 dBm allows for a variety of system designs without degrading performance The Model 2808 is equipped with a man ual gain control that allows the user to adjust the RF output level for optimum per formance The Model 2808 can transport up to 110 CATV channels using the entire frequency bandwidth or it can transport up to 80 channels of standard CATV signals while utilizing the remaining high frequency bands to transport 30 digital QAM channels The receiver includes a universal power supply freeing the user from a bulky wall mount AC adapter The modular design of the Model 2808 offers the flexibility and performance demanded by today s broadband profes sional FCC Notice The Model 2808 has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equipment generates uses an
7. allation Instructions 2 7 2 8 2 8 1 Connections Connector Name Connector Type Connector Function SC APC or FC APC Optical Input It is imperative that backreflections be controlled to very low levels This product must be used only with angle physical contact APC connectors RF Ou RF Ouipul RF Test RF Test 20 dB Tap Accepts a standard IEC Power three wire ground power Power Input cord Optical In Function Status Ground Note The FC APC interface uses the wide key standard This means that the units are optimized for use with FC APC connectors that have a 2 14 mm wide alignment key Nar row key FC APC connectors 2 02 mm may be used but will produce inferior results Standard FC PC connectors have a 2 36 mm wide key and cannot be plugged into either unit 1 tatus Status 3 Pin Phoenix Connector AU Safety Precautions The optical emission from the units are laser based Class IIIb and may present eye hazards if improperly used NEVER USE ANY KIND OF OPTICAL INSTRU MENT TO VIEW THE OPTICAL OUTPUT OF THE UNIT As always be care ful when working with optical fibers Fibers can cause painful injury if they penetrate the skin Laser Safety Procedures 1 ALWAYS read the product data sheet and the laser safety label before power ing the product Note the operating wavelength optical output power and safety classification 2 Ifsafety goggles or other eye protection are used be certa
8. ce is required The Model 2808 CATVLinx PDS PNS CATV Receiver contains no user serviceable parts and requires no routine service Con tact the factory if the unit requires warranty repair work Once the units have been installed verify that the picture quality is good If the picture quality is not good there are several likely causes 1 The optical fiber may have large backreflections Use an OTDR to examine the fiber run 2 There may be non APC optical connectors somewhere in the system These cause unacceptable levels of backreflection 3 The RF input spectrum may not be flat It is possible to have a green RF Level LED even if the input spectrum has a large amount of tilt All Force CATV products are designed to operate with a flat input spectrum 4 There may extraneous i e non video signals in the input RF Be sure to filter out all non desirable signals 5 The optical input power at the receiver may be too low Assuming that the receiver shows a yellow light the optical input level may be too low See Fig ure 1 4 for the expected CNR versus the channel loading and received optical power 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 Fib
9. d 1 per Active Device Receptacle Caps for RF and connector Any Any Optical Connectors 2 3 Items Required Qiy Mfr P N Description AR Force Inc 2804T or 2805T CATWLinx 110 Ch or 77 Ch CATV Transmitter A perami n A 6 32 Panhead Mounting Screws with Lock Washers and Nuts For Rx AR AR AR EIA 19 Grounded Equipment Rack For Tx AR Any Any Straight Screwdriver 1 8 tip AR Any Any 9 125 um Single mode Fiber Revision 2 0 7 Installation Instructions Model 2808 CATVLinx PDS PNS Receiver 2 4 Inspection Remove the unit from its shipping container Any in shipment damage that may have occurred should be visually apparent Look for bent or damaged connectors or mounting brackets Claims for damage incurred in shipment should be made directly to the transportation company in accordance with their instructions Save the shipping cartons until installation and performance verification are completed 2 5 Module Placement Units may be mounted in any orientation on most flat dry surfaces Secure pan head screws through mounting holes provided at the base of the module If the unit is placed in a location where temperatures may exceed 38 C 100 F a good heat sink should be secured The use of silicone thermal pads is recommended between the module and the plate to maximize heat transfer 2 6 Unit Outline Drawing 8 45 a 214 63 8 26 209 80 PNS PDS FIBER OPTIC RECEIVER NI TWOLULdO STATUS RF PART NUMB
10. d can radiate radio frequency energy and if not installed and used in accordance with the instructions in this manual may cause harmful interference in which case the user must correct the interference at the user s own expense Compliance with applicable regulations depends on the use of shielded I O cables The user is responsible for procuring the appropriate cables Revision 2 0 1 Product Technical Bulletin Model 2808 CATWLinx PDS PNS CATV Receiver 1 3 Optical Video Electrical Characteristics 25 C SM Fiber Note 9 Min Typ Max Units Notes See Section 1 5 Operating Wavelength 1290 1310 1330 nm Operating Wavelength 1530 1550 1570 nm Optical Input Power 8 0 4 5 dBm Channel Loading 110 Channels Bandwidth 40 860 MHz Required Fiber Bandwidth 2 000 MHz Output Impedance 75 Ohms RF Output Level 28 dBmV 123 Output Return Loss 16 dB Composite Second Order CSO 63 dBc Composite Triple Beat CTB 66 dBc Carrier to Noise Ratio CNR 4 Backreflection Tolerance 50 dB 5 Power Supply Voltage 120 240 VAC 6 Power Supply Frequency 50 60 Hz 6 Power Dissipation 10 Watts 1 4 Environmental and Physical Characteristics Min Typ Max Units Notes See Section 1 5 Operating Temperature Range 0 50 ue 7 Storage Temperature Range 20 70 C Humidity 8 Weight lbs kg Physical Dimensions 8 45 x 2 95 x 1 12 in 215x75x29 mm 1 5 Specification Notes 1 Figure 1 1 shows the RF output behavior of the 2808 rece
11. e optimized for use with FC APC connectors that have a 2 14 mm wide alignment key Nar row key FC APC connectors 2 02 mm may be used but will produce inferior results Stan dard FC PC connectors have a 2 36 mm wide key and cannot be plugged into either unit 6 Revision 2 0 Model 2808 CATVLinx PDS PNS Receiver Section 2 Installation Instructions 2 1 General Installation Requirements The installation of these units is very simple There are no special unpacking instructions except that care should be taken to handle units gently Fiber optic links are sensitive electronics devices that should be handled with care Like most electronics they are susceptible to ESD Proper ESD techniques such as wearing a wrist grounding strap should be observed at all times when handling a unit The units should not be dropped No assembly is required Do not install the equipment near sources of excessive heat such as furnace out lets or above heat producing units such as large power supplies and tube type equipment Observe temperature and relative humidity requirements specified in Section 1 3 page 2 2 2 Items Provided The following is a list of items provided with each Model 2808 PDS PNS CATV Receiver Qty Mfr P N Description CATVLinx PDS PNS CATV Rx SM with Built in AR Force Inc 2808R SFXX RF Attenuator 1310 1550 nm SC APC Con nector Standard FC APC Optional 1 per unit Any Any IEC Three wire Ground AC power cor
12. er 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 con nector 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 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 Revision 2 0 13 Operating Instructions Model 2808 CATVLinx PDS PNS Receiver 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 pressure to the sides of the ferrule Rotate the ferrule sev eral 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 f
13. gs that would be used with varying optical input levels The optical input levels that are in red exceed the rated range of the 2808 and are not recommended To set up RF output level simply rotate the rotary switch through the 16 posi tion until the desired RF output is achieved Table 1 1 Typical Attenuator Setting vs Optical Input Level Optical Input dBm Typical Attenuator Setting OORWN OL YOKOANWO MMUOQOWYPOONAOKRWN O 3 In most applications the 2808 will be used with a channel loading of 80 ana log channels or 80 30 analog digital channel loads It is under those conditions that the 28 dBmV output level per channel is specified Figure 1 3 shows the recommended maximum RF output level per channel for analog channel loadings from 1 to 110 At 110 analog channels the maximum RF output level per channel is about 26 5 dBmV For ten analog channel loading the RF level per channel increases to 36 5 dBmV 48 46 44 42 40 38 36 34 32 30 28 26 RF Output Level per Channel O O 10 20 30 40 50 60 70 80 90 100 110 Number of Analog Channels Figure 1 3 Recommended Maximum RF Output Level vs Channel Loading 4 Figure 1 4 shows the CNR versus received optical input power and number of channels The horizontal axis is the amount of optical light that reaches the receiver It is not the loss between the transmitter and receiver The vertical axis shows the CNR 4 Revision 2 0
14. ided The unit is UL compliant 7 Most parameters are relatively unaffected by varying temperature A moving air environment is recommended at ambient temperatures above 35 C 8 Humidity is RH non condensing 9 The CATWLinx PDS PNS CATV receiver is optimized for single mode operation only Use on multimode fiber is not recommended even for short distances because of the large amount of modal noise that could result 1 6 Applications Figure 1 5 illustrates a point to multipoint CATV network The Force Inc Model 1188 Optical Splitter Coupler splits the output from Model 2805 transmitter allow ing a single transmitter to drive multiple 2808 receivers Revision 2 0 5 Product Technical Bulletin Model 2808 CATWLinx PDS PNS CATV Receiver Model 2808 RF SS SS SS SS Se CATVLinx Rx Amplifier eae Local l Cable E Provider l l RF Model 2805 Op ee CATVLinx Tx Head End Model 2808 RF CATVLinx Rx Amplifier Model 2808 RF z z pa Osstt IBPON CATVLinx Rx Amplifier Jayds jeondo Model 2808 RF CATWLinx Rx Amplifier Figure 1 5 Point to Multipoint Private Network Solution 1 7 Ordering Information Part Number Description 2808R SFSP CATV VSB AM Rx SM 1310 1550 nm SC APC Connector 2808R SFAP CATV VSB AM Rx SM with Built in RF Attenuator 1310 1550 nm FC APC Connector Note The FC APC interface uses the wide key standard This means that the units ar
15. in that the protec tion is effective at the wavelength s emitted by the device under test BEFORE applying power 3 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 4 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 instru ments such as an optical power meter to verify light output 5 NEVER NEVER NEVER look into the end of a fiber on a powered device with ANY sort of magnifying device This includes microscopes eye loupes and magnifying glasses This WILL cause a permanent irreversible burn on your retina Always double check that power is disconnected before using Revision 2 0 9 Installation Instructions Model 2808 CATVLinx PDS PNS Receiver 2 9 2 10 10 such devices If possible completely disconnect the unit from any power source 6 Ifyou have questions about laser safety procedures please call Force Incor porated for assistance before powering your product A Sales Engineer or Ap
16. ingernail against the tissue so that it is directly over the fer rule 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 col lect 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 3 5 2 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 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 3 6 Troubleshooting Common problems include lack of continuity in the optical fiber lack of power or reversed power or improper input levels The units are designed to work with a 75 Ohm system Consult IOM2804 or IOM2805 for additional troubleshooting of the transmitter If problems persist contact the factory Poem Ck If AC power is connected check the primary A
17. is guide provides basic information on how to configure and install the units it assumes that you as the user are familiar with e the installation and manipulation of electronic and fiber optic equipment e the installation and manipulation of CATV video audio equipment This manual is divided into the following sections Section 1 page 1 Describes the PDS PNS CATV receiver lists technical specifi cations performance graphs system applications and ordering information Section 2 page 7 Describes the installation of the PDS PNS CATV receiver connections and safety precautions Section 3 page 11 Describes the operation of the PDS PNS CATV link trouble shooting and user maintenance A quick reference index completes the user manual Related Documentation IOM2804 User Manual for Model 2804 PDS Transmitter IOM2805 User Manual for Model 2805 PNS Transmitter AN123 North American Television Frequencies AN128 Care and Feeding of Analog CATV Fiber Optic Links ANI41 System Solutions for CATV HFC Networks Fiber Optic Reference Guide 3rd Edition by David R Goff Focal Press 2002 General theory and operation of fiber optic units e Web Site Our web site http Awww forceinc com may be used to download the latest versions of this manual Revision 2 0 il Model 2808 CATVLinx PDS PNS CATV Receiver Preface Technical Support If you encounter any kind of problem after reading this manual contact your local distribu
18. iver The blue line shows the nominal RF output level versus optical input Over the optical input range from 8 dBm to 4 5 dBm the RF output level is adjustable to be a con stant 28 dBmV Below 8 dBm optical input the RF output level falls off by 2 dB for every 1 dB drop in optical input power Operating below 8 dBm opti cal input will cause the CNR to degrade rapidly for channel loads of 77 or more Above 4 5 dBm optical input the RF output level increases by 2 dB for every 1 dB drop in optical input power Force Inc does not recommend operating the 2808R at RF output levels above 28 dBmV per channel It will not cause damage to the unit but the video out may be severely distorted exhibiting poor CTB and CSO 2 Revision 2 0 Model 2808 CATVLinx PDS PNS CATV Receiver Product Technical Bulletin S S o yy EERE fA i tt fi i ESSE RF Output Level dBmV Channel Optical Input dBm Figure 1 1 RF Output Level Behavior of 2808R In Figure 1 1 the central green area is the region that should be used for new designs So while the receiver is rated to optical input powers as low as 8 dBm it is recommended that 6 dBm be the minimum for a newly installed system That leaves 2 dB of margin for the optical power to drop and still pro vide good operation The yellow region is the safety band The unit is rated to operate in this region however the margin will probably be inadequate for a newly installed desig
19. n The red regions are outside the recommended operat ing parameters of the 2808R and must be avoided to ensure reliable opera tion 2 The 2808 receiver has a built in RF attenuator adjustable over a 30 dB range in 2 dB steps The user can adjust a 16 position rotary switch to set the 2808 s RF output level to 28 dBmV over the full rated optical input range The side of the 2808 receiver has a 16 position digital rotary switch that controls the built in RF attenuator see item F in the Figure 1 2 page 3 This amount of RF attenuation can be selected using a 1 8 tip straight screwdriver Figure 1 2 page 3 shows an enlarged view of the 16 position digital rotary switch Figure 1 2 Detailed view of the 16 position digital rotary switch The rotary switch shown in Figure 1 2 selects on of 16 possible settings for the built in RF attenuator Each click of the rotary switch changes the internal attenuation by 2 dB The rotary switch will rotate through 360 with no stops A setting of 0 corresponds to the minimum internal RF attenuation This Revision 2 0 3 Product Technical Bulletin Model 2808 CATWLinx PDS PNS CATV Receiver would be used at low optical input levels where a great deal of gain is required to achieve 28 dBm output level A setting of F corresponds to the maxi mum internal RF attenuation or 30 dB of attenuation This would be used at high optical input levels Table 1 1 shows the approximate attenuator settin
20. ns 9 laser safety 9 12 shipping precautions 10 storage precautions 10 T technical specifications 2 5 electrical 2 environmental 2 optical 2 physical 2 specification notes 2 video 2 technical support See troubleshooting transmitter part numbers 6 troubleshooting 14 repair service 15 technical support iii 18 Revision 2 0
21. plications Engineer may be reached at 540 382 0462 7 Laser safety classes for Model 2804 and 2805 transmitters are as follows Class Wavelength Range Optical Power Accession Limits iii 180 nm to 400 nm Varies with and exposure time 400 nm to 10 nm 0 5 Watt Shipping and Handling Precautions The units are in general very rugged and can withstand the stresses of most ship ping and handling circumstances However the following precautions should be taken 1 When the units are shipped they should be wrapped in a protective material such as bubble wrap to protect against excessive jarring and to prevent dam age to the external finish of the units Always use packing material to separate multiple units that are packaged together 2 Care should be taken not to drop or strike the units in any way especially around the optical connectors 3 The units should never be submersed in any liquid SEVERE SHOCK HAZ ARD 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 Alow humidity environment is preferable for long term storage 3 All connectors should be covered with active device receptacle caps Revision 2 0 Model 2808 CATVLinx PDS PNS Receiver Section 3 Operating Instructions 3 1 System Diagram The 2808 is a sophisticated state of the art CATV receive
22. ptical loss between the transmitter and the receiver Connect the RF source VCR camcorder cable television etc to the RF input on the transmitter Connect the RF output on the receiver to the monitor input The monitor input should present a 75 Ohm impedance Connect the AC power cord to the transmitter and receiver OPTICAL LASER RADIATION IS PRESENT AT THE TRANSMITTER OPTICAL CONNEC TOR AND THE FIBER THAT ATTACHES TO THE RECEIVER OPTICAL CONNECTOR WHEN THE UNIT IS ACTIVATED AVOID DIRECT EYE EXPOSURE TO THE BEAM Adjust the RF attenuator see Figure 2 1 page 8 for location of the 16 position rotary switch to yield the desired RF output level Each click of the rotary switch will change the RF level by 2 dB Force recommends that the output be adjusted to 28 dBmV per channel Higher levels may cause distortion while lower levels may yield lower CNR The unit is now fully operational Verify the proper operation of the link by fol lowing the steps in Section 3 4 page 13 No user adjustment or attention is required See Section 3 5 page 13 for instructions on maintaining and clean ing the link See Section 3 6 page 14 for information on troubleshooting Measuring RF Input Levels at the Transmitter Excessive RF input to a fiber optic CATV transmitter WILL destroy the laser even if the unit is not powered Lasers can be destroyed by being overdriven for as little as one nanosecond 10 seconds Because they can be destroyed so
23. quickly it is essentially impossible to design a circuit or fuse that will blow before the laser is destroyed Therefore it is imperative that the RF level be within acceptable limits BEFORE the cable is attached to the transmitter 1 2 Using a spectrum analyzer determine that the RF level input to the transmitter is within safety bounds The RF In LED on the unit gives a positive indication of the RF level If the LED is yellow the RF level is too low Increase in 2 dB steps until the LED turns green If the LED is red the RF input level is too high Disconnect the RF input immediately Decrease RF levels by 6 dB and reconnect the RF input until the LED turns yellow or green If it turns yellow increase RF levels by 2 dB steps until the LED turns green Ideally the RF level should be checked with an instrument such as a spectrum analyzer to verify that the levels are appropriate If instrumentation is not available to actually measure the RF levels Force recommends adding 40 dB of attenuation at the transmitter input 40 dB of attenuation will adequately protect the unit from the highest RF levels that might be seen in a typical CATV installation Do not attach the RF cable at this time just verify the RF levels and or add the appropriate attenuators at the transmitter input Revision 2 0 Model 2808 CATVLinx PDS PNS Receiver Operating Instructions 3 4 3 5 3 5 1 Performance Verification No user maintenan
24. r It provides an impres sive set of capabilities in a very small package Key features include e Integral universal AC power supply e Built In digital RF attenuator e Very wide optical input range e Exceptional CNR performance over the full optical input range e High output RF level 20 dB RF output tap Figure 3 1 shows a block diagram of the 2808R Preamplifier Postamplifier Power Amplifier AY A2 F Output Photodiode Digital ya RF Attenuator 20 dB RF Tap Built in Optical Power Meter Current Amplifier Status amp Alarm Status LEDs Aa Status Flag Figure 3 1 Block Diagram of the Model 2808 3 2 Power up and Operation 1 Install the links as described in earlier in this section 2 Measure the RF level BEFORE making any connections to the transmitter This measurement is described in Section 3 3 page 12 Revision 2 0 11 Operating Instructions Model 2808 CATVLinx PDS PNS Receiver 3 3 12 3 4 5 6 7 8 9 Clean the optical connectors See Section 3 5 page 13 for cleaning instruc tions Be sure that all connectors are APC type Connect the optical fiber to the transmitter and the receiver Be sure that the fiber has continuity and less than the maximum allowable optical loss Also be certain that the fiber is the proper size This product can only be used with sin gle mode fiber The input power to the Rx must be less than 4 5 dBm The units will not work back to back i e no o
25. s 8 26 Unit Outine Drawing serene e e accents 8 Figure 2 1 Model 2808 CATWLinx PDS PNS CATV Receiver 8 DP OC CHONG tecae scp atenac E E E nae saeceantecacetan 9 DO SANE FC ANON NG ces case cneecioctse E TE a renaaaacuamandeeeteteaneee 9 2 9 Shipping and Handling Precautions ccccceceeeeceeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeaneeeeeeeees 10 2 TO Stonne Le UNE a aE teens 10 Revision 2 0 v Contents Model 2808 CATVLinx PDS PNS CATV Receiver Section 3 Operating Instructions cccceeseeeeeeeeeeeeeeeeeeeeeeeeneaeeeeeeseeeeesneeeeeeeeeenenens 11 a is bio ge DIAS gold een ee ae ee ee 11 Figure 3 1 Block Diagram of the Model 2808 cccccceeseeeeteeeeeteeteeeeeeee 11 3 2 POW er Up anda Operation vacauicenanecasetsas ascnceatas sacked saseadeod asesancetace aeeatconea temas cone 11 3 3 Measuring RF Input Levels at the Transmitter ccceccceeeeeeeeeeeeeeeeeeeeeeeeeeeeees 12 3 4 Performance Verification cc cssccecccccsccceseesseseeeecseeesansuseeeeceecsesseedeseseeeessasass 13 CIS AMIS e E T tania doalonaneneotetca enc tncenneh 13 BO Toone OO US irens n E abit patna E Sante Oe 14 Dl TROD AN SOIC ea cae ie ee pars steed ae dees ee ges crane eee voce noe 15 NINO EEEE A EEE E EE E AE E EE E A 17 vi Revision 2 0 Model 2808 CATVLinx PDS PNS CATV Receiver Section 1 Product Technical Bulletin 1 1 1 2 Product Overview The Force Incorporated CATV_inx Model 2808 PDS PNS CAT
26. te description of the failure or observed anomalies All units are marked with model number and serial number This identification sticker is placed on the rear panel transmitter or on the product label receiver The serial number is a date code used as a reference for warranty service Revision 2 0 15 Operating Instructions Model 2808 CATVLinx PDS PNS Receiver 16 Revision 2 0 Model 2808 CATVLinx PDS PNS CATV Receiver Index A applications 6 C cleaning the optical connector 13 cnr vs rx optical input channel loading diagram 5 connections 9 optical 9 12 14 power 9 RF 9 12 status monitoring 9 D diagrams performance cnr vs rx optical input channel loading 5 F FCC notice 1 H handling precautions 10 handling the optical connector 14 Revision 2 0 Preliminary inspection 8 installation 7 10 general requirements 7 items provided 7 items required 7 module placement 8 outline drawing 8 power up 11 RF input level measurement 12 unit inspection 8 L laser safety precautions 9 12 O operating instructions 11 15 performance verification 12 ordering information 6 P part numbers receiver 7 transmitter 6 power up 11 product drawing 8 17 Index Model 2808 CATVLinx PDS PNS CATV Receiver Preliminary product overview I W product TB 1 6 B warranty iii R receiver part numbers 7 repair service 15 RF input level measurement 12 S safety precautio
27. tor or a Force Inc Applications Engineer To reach technical support On the Web htto www forceinc com By Phone Monday through Friday 8 00 am USA 800 732 5252 to 5 00 pm EST TEL 540 382 0462 By Fax 540 381 0392 By Email sales forceinc com Warranty Force Incorporated standard products are warranted to be free from defects in materials and workmanship meeting or exceeding factory specified performance standards for a period of three 3 years from date of purchase Force Obligations Force will at its discretion and expense repair any defect in materials or work manship or replace the product with a new product Force will upon receipt of the return evaluate the product and communicate to the customer the nature of the problem and determine if the claim falls under warranty coverage If during the warranty period Force is unable to repair the product to the original warranted state within a reasonable time or if subcomponents of the unit have been obsoleted or discontinued then Force has the option to provide an equiva lent unit Exclusions This warranty does not extend to any product that has been damaged due to acts of God accident misuse abuse neglect improper system design or application improper installation improper operation or maintenance or connection to an improper voltage supply The Force warranty does not cover fuses batteries and lamps Modifications or alterations of Force produc
28. ts including but not limited to installation of non Force equipment or computer programs except as authorized by Force will void this warranty Removal or breaking of the seals on the product will also void the war ranty In addition cost of repair by unauthorized persons within the warranty period of the product will not be covered by Force Incorporated Such repairs will void the warranty Revision 2 0 ili Preface Model 2808 CATVLinx PDS PNS CATV Receiver Force Incorporated makes no other representation or warranty of any other kind express or implied with respect to the goods whether as to merchantability fit ness for a particular purpose or any other matter Force Incorporated s liability shall not include liability for any special indirect or consequential damages or for any damages arising from or attributable to loss of use loss of data loss of good will or loss of anticipated or actual revenue or profit or failure to realize expected savings even if Force Incorporated has been advised of the possibility of such damages This warranty constitutes Force Incorporated s entire liability and the customer s sole remedy for defects in material and workmanship IV Revision 2 0 Model 2808 CATVLinx PDS PNS CATV Receiver Contents PRCT ACC ys cteaninactanderecsicen i aaa i Ea ii Section 1 Product Technical Bulletin 2 2 2 cscseeeeeeeeeeeeeeeeeeeeeneeeeeeeeeseseeeeeeeeeeeees 1 1 1 Product Oy CIO
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