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INSTRUCTION MANUAL
FOCN Series
Fiber Optic Compact Node
Model
FOCN-S4S-201
FOCN-S4S-204
FOCN-S4S-205
Status
Active
Obsolete
©2010 Blonder Tongue Laboratories, Inc. All rights reserved. Specifications are subject to change without notice. Trademarks are the property of their respective owner.
Stock No.
7420A-1
7420A-4
7420A-5
Date
September 28, 2010
May 15, 2009
(800) 523-6049 • (732) 679-4000 • FAX: (732) 679-4353
Document No.
Issue No.
651215000C
651215000B
One Jake Brown Road
Old Bridge, NJ 08857-1000 USA
www.blondertongue.com
Author
3
KK
2
KK
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Summary of Contents for Blonder tongue FOCN Series
- Page 1 One Jake Brown Road Old Bridge, NJ 08857-1000 USA (800) 523-6049 • (732) 679-4000 • FAX: (732) 679-4353 www.blondertongue.com INSTRUCTION MANUAL FOCN Series Fiber Optic Compact Node Model Stock No. FOCN-S4S-201 7420A-1 FOCN-S4S-204 7420A-4 FOCN-S4S-205 7420A-5 Status Date Document No. Issue No. Author Active September 28, 2010 651215000C Obsolete May 15, 2009 651215000B ©2010 Blonder Tongue Laboratories, Inc. All rights reserved. Specifications are subject to change without notice. Trademarks are the property of their respective owner.
- Page 2 FOCN Instruction Manual AVOID EXPOSURE Warning: The optical emissions from the units are INVISIBLE LASER RADIATION EMMISSIONS laser-based and present eye INVISIBLE LASER RADIATION EMITTED FROM END OF FIBER OR CONNECTOR AVOID EXPOSURE TO BEAM Wavelength: 1.3µm Max. Output: 30 mW Do not view beam directly with hazards. Follow all safety precautions optical instruments Class III Laser Product INVISIBLE LASER RADIATION EMITTED FROM END OF FIBER OR CONNECTOR AVOID EXPOSURE TO BEAM Class IIIB Laser Product IEC-60625 1193 Max.
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Page 3: Installation/Environmental Considerations
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 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. 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. -
Page 4: Specifications
FOCN Instruction Manual Specifications Forward Optical Receivers F-P & DFB Versions RF Input RF Output Frequency Range: (+/- 1.0 dB) 5-42 MHz (NTSC) Frequency Range (+/- 1.0 dB): 54-1000 MHz (NTSC) RF Test Point (return): -20 dB (external); Type F Output Level (@ -1 dBm optical input): Return Loss (with Return TX Installed): +28 dBmV (@ 550 MHz) > 16 dB within the Return Band Return Loss: 14 dB min., 16 dB typical Return Path NPR: 15 dB min. of NPR Range FP: 37 dB NPR Threshold Impedance: 75 Ohm DFB: 41 dB NPR Threshold CNR (@ 0 dBm optical input): > 53 dB Optical CSO (@ -1 dBm optical input): > 63 dBc Optical Output: CTB (@ -1 dBm optical input): > 65 dBc DFB = 4.8dBm (3mW) @1310nm Slope: 0dB DFB = 4.0dBm (2.5mW) @1550nm RF Test Point (forward) -20 dB; Type F Return Loss: > 50 dB with APC connector Optical Optical Connector SC/APC, 8° APC Wavelength: 1280 - 1610 nm Optical Input Power Range: +2 dBm to -8 dBm Return Loss: > 50 dB with APC connector Optical Input Power Test Point: 1 V/mW +/- 0.1 V Optical Connector: SC/APC, 8° APC * N OTE: Typical levels @ 0 dB slope to 1000 MHz with 8dBm optical transmitter with OMI @ 3.2%, & 77 NTSC channel loading to 550 MHz & digital loading to 1000 MHz (-6 dB... - Page 5 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 .63V 6 dBmV 26 dBmV 0 dBm 1.0V 10 dBmV 30 dBmV...
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Page 6: Internal Adjustments
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 extended 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 point 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. - Page 7 FOCN Instruction Manual System Setup & Trouble Shooting 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 transmitting 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.
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Page 8: Maintenance Instructions
FOCN 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: • Kimwipes ® or any lens-grade, lint-free tissue. The type sold for eyeglasses work quite well. • Denatured Alcohol.* * NOTE: U se 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. • 30X Microscope. • Canned Dry Air. Directions for Cleaning: 1) Fold the tissue twice so it is four layers thick. 2) Saturate the tissue with alcohol. 3) F irst 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 several times to remove all contamination from the ferrule sides. 4) N ow 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. - Page 9 FOCN Instruction Manual Notes...
- Page 10 FOCN Instruction Manual Notes...
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Page 11: Limited Warranty
BT may determine) any product manufactured by BT which proves to be defective in materials or workmanship or fails to Blonder Tongue Laboratories, Inc. (BT) will at its sole option, either repair or replace (with a new or factory reconditioned product, as BT may meet the specifications which are in effect on the date of shipment or such other specifications as may have been expressly... - Page 12 One Jake Brown Road Old Bridge, NJ 08857-1000 USA (800) 523-6049 • (732) 679-4000 • FAX: (732) 679-4353 www.blondertongue.com...
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