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Furukawa electric FITEL S123M8 User Manual

Fusion splicer
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S123M8/M12
•
Please read entire manual prior to usage.
•
This manual must be kept with the S123 Fusion Splicer.
User's Manual
Issue 2
FUSION SPLICER
FTS-B419

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  • Page 1 FTS-B419 S123M8/M12 FUSION SPLICER User’s Manual • Please read entire manual prior to usage. • This manual must be kept with the S123 Fusion Splicer. Issue 2...
  • Page 3 Contents Contents INTRODUCTION..........................1-1 SAFETY INFORMATION AND INSTRUCTIONS ................2-1 2.1.........................2-1 AFETY NFORMATION 2.2........................2-1 AFETY ESSAGES 2.3. WARNINGS CAUTIONS ....................2-3 2.4......................2-13 OWER EQUIREMENTS 2.5........................2-14 OXIC AZARDS 2.5.1. Incineration........................2-14 2.5.2. Acidic or caustic compounds ..................2-14 2.5.3. Physical damage......................2-14 GETTING STARTED........................3-1 3.1.
  • Page 4 Contents 4.4......................4-6 PTIONAL CCESSORIES 4.5.....................4-6 ECOMMENDED ONSUMABLE EXTERNAL DESCRIPTION ......................5-1 5.1..........................5-1 5.2. LED....................5-3 PERATING EYS AND TATUS 5.2.1. Operating Keys ........................5-3 5.2.2. LED Indicators........................5-4 5.2.3. Buzzer ..........................5-5 5.3............................5-6 CREENS 5.3.1. Ready Screen ........................5-6 5.3.2. Screen during Splice ......................5-7 5.3.3.
  • Page 5 Contents 6.2.1. Fusion Program......................6-10 6.2.2. Heat Program.........................6-14 6.2.3. Selecting the Operating Language ................6-17 FUSION SPLICING.........................7-1 7.1..........................7-1 ASIC PLICING 7.1.1. Arc check .........................7-1 7.1.2. Preparing the Fiber ......................7-5 7.1.3. Loading the Fiber ......................7-11 7.1.4. Using the Fiber Reformer....................7-14 7.1.5. Fusion Splicing .......................7-15 7.1.6.
  • Page 6 Contents 8.2.6. Parameter Table ......................8-14 8.3...........................8-22 ISTORY 8.3.1. Splice Data ........................8-22 8.3.2. Image Capture .......................8-27 8.4............................8-29 8.4.1. Machine Check ......................8-30 8.4.2. Fiber Measuring ......................8-32 8.4.3. Environment ........................8-34 8.4.4. Manual Splicing ......................8-35 8.4.5. Image Capture .......................8-37 8.4.6. Adjusting shrinking condition of sleeve ................8-38 8.4.7.
  • Page 7 Contents 9.2.1. Arc Check.........................9-7 9.2.2. Electrode Maintenance ....................9-7 9.2.3. Cleaning the V-grooves....................9-10 9.2.4. Cleaning the V-groove Fiber Clamps ................9-11 9.2.5. Cleaning the Fiber Holder ....................9-12 9.3........................9-13 ACKUP ATTERY 9.4......................9-14 TORING AND HIPPING 9.5......................9-14 LAIMS AND EPACKAGING 9.6.
  • Page 9 Introduction 1. Introduction The FITEL Fusion Splicer S123 series are compact designed fusion splicer. S123M12/M8 Ver.2 Fusion Splicer splices single fiber and ribbon fiber. After setting the prepared fibers, S123M12/M8 Ver.2 automatically feeds the fiber ends and inspects their cleave condition, axis offset.
  • Page 11 Failure to comply with any of these instructions or with any precaution or warning contained in the User’s Manual is in direct violation of the standards of design, manufacture and intended use of the instrument. Furukawa Electric Co., Ltd. assumes no liability for the customer’s failure to comply with these safety requirements.
  • Page 12 In no case will The Furukawa Electric Co., Ltd. be liable to the buyer, or to any third parties, for any consequential or indirect damage which is caused by product failure, malfunction, or any other...
  • Page 13 Safety Information and Instructions 2.3. WARNINGS and CAUTIONS WARNING The power cord supplied with this equipment must be connected to a power socket, which provides a reliable protective ground. Or, ground it with the Ground terminal on the fusion splicer. Use only the cords attached to the fusion splicer.
  • Page 14 Safety Information and Instructions WARNING Do not disassemble the instrument except as described in the maintenance section of this manual. The fusion splicer contains no user serviceable parts. Warranty on this product will be void f any of the potted nuts are disturbed. Avoid soaking the fusion splicer with water.
  • Page 15 Doing so may cause fire or electrical shock. If water is spilled into the fusion splicer, turn off the power switch, disconnect the power cord, remove the batteries, and contact The Furukawa Electric Co., Ltd. or your local representative. Continuing to operate under these conditions may cause fire or electrical shock.
  • Page 16 Safety Information and Instructions WARNING If the fusion splicer is dropped and damaged, turn off the power switch, disconnect the power cable, remove the batteries, and contact The Furukawa Electric Co., Ltd. or your local representative. Continuing to operate may cause fire or electrical shock.
  • Page 17 IP5X rating dust proof (exposed to dust particles with a diameter of 0.1 to 25µm for 8 hours) * *Above tests were performed at Furukawa Electric Co,. Ltd laboratories and do not guarantee that the machine will not be damaged when subjected to these conditions...
  • Page 18 Safety Information and Instructions CAUTION Do not place the fusion splicer on an unstable or inclined surface. There is a possibility that the fusion splicer will fall and cause injury. Disconnect all cords when moving the fusion splicer. Failure to do so may damage the cords which may cause fire or electrical shock.
  • Page 19 Safety Information and Instructions CAUTION Ensure that the cords are disconnected and the batteries are removed from machine’s main body when storing the fusion splicer. Never use aerosol dust cleaners or alcohol-based solvents to clean the electrodes. Non oil-based solvents should be used to clean the optical lenses. Store the fusion splicer in a cool dry place.
  • Page 20 Safety Information and Instructions The S943B Battery is made of Li-ion battery cells. Refer to following safety instructions on handling and operating the Battery safety. WARNING Do not dispose the Battery in fire, or leave the Battery near a high-temperature object.
  • Page 21 WARNING Disposal of used Battery must be carried out according to disposal established by Law. For instructions, contact The Furukawa Electric Co., Ltd. or your local representative. CAUTION Do not charge the Battery, when the Battery has a full charge. Doing so, will decrease battery life.
  • Page 22 Safety Information and Instructions Notes This symbol mark is for EU countries only. This symbol mark is according to the directive 2006/66/EC Article 20 Information for end-users and Annex II. This symbol means that batteries and accumulators, at their end-of-life, should be disposed of separately from your household waste.
  • Page 23 Safety Information and Instructions 2.4. Power Requirements The S123 fusion splicer has the S943B internal battery for battery operation and the battery is charged by the S958C Battery Recharger through S967A and S977A AC adapter with AC power source that supplies between 100-240 V at a frequency of 50-60 Hz. The S123 fusion splicer can also operate using AC power with the S976A AC adapter.
  • Page 24 Safety Information and Instructions 2.5. Toxic Hazards The S123 fusion splicer presents no toxic hazards (under normal conditions of use, storage, and handling). However, under the following conditions, certain precautions are necessary. 2.5.1. Incineration Some of the electronic components included in the assembly are constructed with resins and other chemicals that produce toxic fumes during incineration.
  • Page 25 5. Visually inspect the S123 fusion splicer and all accompanying components for structural damage that may have occurred during shipping. Immediately inform Furukawa Electric and the carrier, if the contents of the shipment are incomplete, or if any of the S123 fusion splicer components are damaged, defective, or if the S123 fusion splicer does not pass the initial inspection.
  • Page 27 Operating Specifications and Components 4. Operating Specifications and Components 4.1. Product Line Up S123 fusion splicer series provides following model types, depending on the application. This manual describes two models, S123M8Ver.2 and S123M12Ver.2. Please refer to the right operation guide accordingly. Model Application S123M8 Ver.2...
  • Page 28 Operating Specifications and Components 4.2. Specifications The specifications of each splicer are referred the following table. Item Specification and Features Fiber type* SM / MM / DS / NZDS / BIF / UBIF Single Fiber and 2, 4, 6, 8-fiber Ribbon (S123M8) Fiber count Single Fiber and 2, 4, 6, 8, 10, 12-fiber Ribbon (S123M12) 0.25, 0.9mm for Single Fiber...
  • Page 29 Operating Specifications and Components Item Specification and Features Environment temperature: -10 - +50 °C Operation Environment Humidity: Below 90% at 38°C Environmental Conditions (No condensation) Environment temperature: -40 - +60 °C Storage Environment Humidity: below 95% SMF: 0.05 dB, MMF: 0.03 dB Average Splice Loss* DSF: 0.08 dB, NZDS: 0.08dB Typical Splicing Time...
  • Page 30 Operating Specifications and Components 4.3. Components 4.3.1. Standard Components The S123 Fusion Splicer comes with the following standard equipment. Be sure to confirm their presence before starting any operation. The component is difference by ordering number. S123M8 S123M12 品名 型式 S123M8 Main Body S123M8-X-A-0001 －...
  • Page 31 Operating Specifications and Components 4.3.2. Optional Components     Item Part Number Quantity Soft Carrying Case  *1 SCC-01 Cooling Tray CTX-01 Angle Stand AGS-01 Working Belt WBT-01 USB Cable USB-01 Car Cigarette Cable  *2 CDC-01 Cleaning Brush VGC-01 Li-Ion Battery S943B Battery Recharger S958C...
  • Page 32 Operating Specifications and Components 4.4. Optional Accessories Contact the Furukawa Electric Co., Ltd. or your local representative for a more detailed specification. • S210 Stripper • S218R Hot Stripper • S326 High Precision Cleaver • S921 60mm Splice Length Protection Sleeves for Single fiber •...
  • Page 33 External Description 5. External Description 5.1. Main Body Wind shield Protection sleeve heater LCD monitor Strap hook Operating key USB Port Battery door DC power port...
  • Page 34 External Description S123M8Ver.2/M12Ver.2 V groove Joint Fiber clamp It can be a switch of non-synchronization/synchronization with the joint.
  • Page 35 External Description 5.2. Operating Keys and Status LED 5.2.1. Operating Keys Indicator Name Main functions Start Start/Pause/Restart the splicing process Selecting the function(s) shown on left bottom Function 1 corner of LCD. Selecting the function(s) shown on right bottom Function 2 corner of LCD.
  • Page 36 External Description Indicator Name Main functions Left Move left Right Move right Heating Start heating／Stop heating Power Turn on/off the power 5.2.2. LED Indicators Indicator Name Color State LED is on when power is turned to “on”. Power LED Green LED flashes when it is in “sleep”...
  • Page 37 External Description 5.2.3. Buzzer Buzzer will ring whenever any key is pressed. In addition, the following buzzer patterns indicate status of operation. Operating key: one beep Completing machine reset: one beep Error occurred: three beeps Splicing finished: a series of beeps Saving data: two beeps Heating process finished: one long beep...
  • Page 38 External Description 5.3. Screens 5.3.1. Ready Screen Once the S123 fusion splicer is powered up and initialized, the “Ready” screen is displayed. Date and Time Splice Process Status Splice Program Heat Program Fiber View Current Function of Function Keys...
  • Page 39 External Description 5.3.2. Screen during Splice Pop-up Window Fiber Images Pop up when new functions X from front camera and Y from are selected. Also, shows back camera. X and Y views can warning error be switched. messages. S123M12, fibers displayed in the order from bottom to top (1-12).
  • Page 40 External Description 5.3.3. Status Icons Type Icon Content Using external power Using internal battery. The level of battery has four stages. The lamp will start to flash when the level is very low. Power The splicer has two battery slots. Upper slot is called 1, the other is number 2.
  • Page 41 External Description Type Icon Content In this mode, splicing is triggered by closing the wind shield. Splicing process goes on until the end of splicing. Splicing process pauses once before arc discharge. Splicing process pauses at each sub-step. In this mode, splicing is triggered by closing wind shield and then Running mode pressing the Start key.
  • Page 42 External Description *2) The heater cooling fan pauses regardless of the its icon status, when heating and splicing are done at the same time. Splicing is completed, the cooling fan works again. 5-10...
  • Page 43 External Description 5.3.4. Menu Screen Press ◄ ► and ▲ ▼ keys to access to the desired menu and the pointed menu pop-ups to large icon. Press Enter to select the menu. Function keys are provided to initiate current available functions displayed above the function keys.
  • Page 44 External Description Function Menu Function Keys Press to select corresponding Function Menu 5-12...
  • Page 45 Basic Operation 6. Basic Operation 6.1. Preparations for Power Supply 6.1.1. Installing Battery Insert S943B battery as shown below. Battery Door Lock Battery Door 2. Lower the Battery 1. Pull the Battery 3. Open the Battery Door a little. Door Lock. Door Lock.
  • Page 46 Basic Operation 4. Insert the battery straight in the battery slot of the fusion splicer in the correct direction. After closing the battery door, lock the door lock surely. Don’t pull out the battery when power is turned on. The power supply might fall.
  • Page 47 Basic Operation 6.1.2. Removing Battery How to detach the battery is a procedure opposite to the installation. Be sure to turn off the Power switch before removing the battery. When installing and/or removing the battery, be careful not to drop the battery.
  • Page 48 Basic Operation 6.1.3. Connecting the power cable to AC adapter     Connect the AC adaptor to DC Power port of the Splicer, and plug the AC adaptor into AC outlet. DC power port AC adaptor...
  • Page 49 Basic Operation 6.1.4. Charging the Battery When charging battery in the S178 Ver.2 splicer After connecting the power cable to AC adapter and plugging the power cable into AC outlet, Turn the splicer on. Charging process starts. ( When arc-discharging, charge process stops temporarily. The charge time will be longer. And the charge time will vary depending on the remaining power level of battery.) Charging, Battery indicator is red.
  • Page 50 Basic Operation How to set the Sleep mode Select “Setting” on the menu Select “Parameter” Set “Sleep Type” to All”. screen Splicer turned automatically without being operated for awhile.
  • Page 51 Basic Operation Screen display during charging When "Sleep Type" is set to "LCD" or "ALL", the LCD screen changes into the following display, after non-operation continues.   When set to “ALL”, Splicer is turned off automatically in a few minutes. Green lamp blinks Green lamp blinks After non-operation continues,...
  • Page 52 Basic Operation When charging battery with the external charger Follow the procedure below to charge the S943B battery. 1. Place the S958C Charger on a flat surface and connect to AC power source with AC adapter. When a power supply is connected, the power lamp turns on green steady light. 2.
  • Page 53 Basic Operation 6.1.5. Turn Splicer ON and OFF Turning ON/OFF the power : Keep pushing power key (for about 2 seconds)        Power key     Turning ON power The opening massage will appear on the LCD screen for a short while, before the ready screen showing up.
  • Page 54 Basic Operation 6.2. Load programs Install appropriate programs before operation. The S123 fusion splicer already has pre-defined programs installed for major fiber types and protection sleeves. Select the program for fusion and heat, or edit and store a new program. 6.2.1.
  • Page 55 Basic Operation 3. Select “Auto Selection”, and press Enter key, and the Fiber type screen is displayed. 4. Select the proper fiber type by pressing ▲ ▼ keys and press the Select key. 5. “Ready” screen is displayed, and “AUTO” is displayed for the splicing program.  ...
  • Page 56 Basic Operation Description Mode Comment SM12 SINGLE MODE Splicing for standard SM12 fibers SM10 SINGLE MODE Splicing for standard SM10 fibers SINGLE MODE Splicing for standard SM8 fibers SINGLE MODE Splicing for standard SM6 fibers SINGLE MODE Splicing for standard SM4 fibers SINGLE MODE Splicing for standard SM2 fibers SINGLE MODE...
  • Page 57 Basic Operation Description Mode Comment DISPERSION SHIFT Splicing for standard DS1 fibers NZ12 NON ZERO DS Splicing for None-Zero DS12 fiber NZ10 NON ZERO DS Splicing for None-Zero DS10 fiber NON ZERO DS Splicing for None-Zero DS8 fiber NON ZERO DS Splicing for None-Zero DS6 fiber NON ZERO DS Splicing for None-Zero DS4 fiber...
  • Page 58 Basic Operation 6.2.2. Heat Program Press the Menu key to display the menu screen. Select “Heater PRGM” and press Enter key, and the Heater PRGM screen is displayed. Select the proper program by pressing ▲ ▼ keys and press the Select key. Press the Escape key repeatedly until the Ready screen is displayed.
  • Page 59 Basic Operation Mode Comment Description vacant ---- ---- vacant 60MM CONTINUOUS Heating continuously for 60mm ---- CURL REMOVE Removing fiber curl ---- vacant ---- vacant ---- vacant ---- vacant Shrinking for Furukawa S922 sleeve (40mm length) 40MM S922 POWER with pre-heating Shrinking for Furukawa S921 sleeve (60mm length) 60MM S921 POWER...
  • Page 60 Basic Operation When the S123 is turned on, the last program used is selected automatically. The curl removing program is installed in program No.010. The curl-removing program can be selected from the heater program menu. Additionally, it can be selected by long pressing the heating key, when the heating status icon is blue.
  • Page 61 Basic Operation 6.2.3. Selecting the Operating Language The S123 fusion splicer can be set to provide operating prompts in several languages. The default operating language is English. From the Ready screen, press Menu key to access the Menu screen. Select “Setting” and press Enter key. Select “Parameter”...
  • Page 63 Fusion Splicing 7. Fusion Splicing 7.1. Basic Splicing 7.1.1. Arc check The arc power on the S123 splicer is optimized in the factory before shipment. The S123 uses a “Real Time Arc Control System” or RTAC to compensate the arcing parameters based on the environmental conditions, wear of electrodes, and fiber characteristics.
  • Page 64 Fusion Splicing During the arc discharge, the fiber feeding motors of the S123 fusion splicer remains idle, preventing the fiber ends from butting. As a result, the fiber ends melt back. The arc check function inspects how far the fibers melt back and the centered position of the fiber.
  • Page 65 Fusion Splicing ♦ A visual arc check can be made by viewing the arc on the monitor by pressing key. Electrode discharge should produce a straight and steady arc. Swaying in the arc indicates that the electrodes require either cleaning or replacing. ♦...
  • Page 66 Fusion Splicing The Arc Check usually passes within three times. However, when the condition using the splicer is greatly different last time, The Arc Check might be necessary three times or more until the Arc Check passes.
  • Page 67 Fusion Splicing 7.1.2. Preparing the Fiber Splice loss is directly affected by the quality of the fiber preparation. For best results, ensure that the V-grooves are clean and that the fiber ends are properly cleaned and cleaved. Preparing the single fiber according to the following procedure. 1.
  • Page 68 Fusion Splicing 3. Wipe the bare fiber with a lint-free tissue soaked with denatured alcohol. Cleaning cotton Bare fiber Please use ethanol of more than 99% of purity for cleaning fiber. 4. Make sure to use the suited fiber holder according to the diameter of the fiber coating. Place the fiber in such a manner that the fiber coatings removal edge matches the holder convex end as below.
  • Page 69 Fusion Splicing Clean the fiber carefully, especially around the ragged edge of the coating to remove the residue. If the residue remains at edge and such fiber is put into the V-groove, it may cause the axis offset subsequently. Prepare the ribbon fiber according to the following procedure. 1.
  • Page 70 Fusion Splicing Strip off a portion of coating by using the Hot stripper. For the details, refer to the manual of the Hot stripper. Fiber holder Ribbon fiber Hot stripper (S218R) 4. Wipe the bare fiber with a lint-free tissue soaked with denatured alcohol. Ex.
  • Page 71 Fusion Splicing 5. Cleave the fiber so that 10mm length of bare fiber extends past the fiber coating. Refer to the manual of the cleaver for details. 13mm 10mm ♦ Do not clean the bare fiber after it has been cleaved. ♦...
  • Page 72 Fusion Splicing Fiber holder can stick to splicer’s windshield magnetically. But, be careful not to drop a fiber holder. 7-10...
  • Page 73 Fusion Splicing 7.1.3. Loading the Fiber 1. Open the windshield. 2. Set the fiber holder by inserting the hole on the fiber holder to the pin on the fusion splicer as shown in the picture. Be sure that nothing touches the bare fiber tip.
  • Page 74 Fusion Splicing In case of splicing 900µm coating fiber, if the fiber has curls or bending, it may be difficult to put such fiber on to V-groove such that the fiber jumps out from the V-groove. In such case, it might be better to put the fiber edge in a downward direction (flip fiber with 180 degree).
  • Page 75 Fusion Splicing 8 fibers １ ２ ３ ４ ５ ６ ７ ８ ９ 10 11 12 Ｖ groove ( Heater side） （monitor side） Number of V groove fiber 2 ribbon 4 ribbon 8 ribbon 12 ribbon 1 If the fiber has curls or bending, it may make it difficult to sit properly in the v-groove.
  • Page 76 Fusion Splicing 7.1.4. Using the Fiber Reformer Use the Fiber reformer when the fiber has severe curl Fiber reformer preventing the fiber from resting correctly in the V-groove. Prepare fiber in fiber holder per normal procedure. Put the fiber reformer on the fiber holder, the guide of reformer makes contact with the fiber coating.
  • Page 77 Fusion Splicing 7.1.5. Fusion Splicing Ensure that the “READY” screen is displayed on the monitor. Press to initiate the fusion splicing cycle. The S123 fusion splicer performs the following functions automatically. To pause the S123 fusion splicer during any of these functions, press .
  • Page 78 Fusion Splicing <Splicing flow, when splicing 12-ribbon fiber at S123M12>   Feeding fibers Inspecting Arc discharging Estimation loss <Splicing flow, when splicing 8-ribbon fiber at S123M8> Feeding fibers Inspecting Arc discharging Estimation loss 7-16...
  • Page 79 Fusion Splicing After displaying the estimation loss, the following operation is available. Press ◄ ► keys to switch the screen of X Press ▲ key to discharge an additional arc, splice inspection and loss estimation are re-performed Press▼ key to display the inspecting data before and after splicing.
  • Page 80 Fusion Splicing ♦ If the fibers fail the inspections for cleave criteria, the fusion cycle is paused and an appropriate error message is displayed as below. ▼ key, an error massage will be un-displaying and you will be able to see the state of fiber. Open the windshield, remove the fibers after READY is displayed and retry the splice by repeating the entire procedure, starting from the fiber preparation process.
  • Page 81 Fusion Splicing 7.1.6. Splicing Defects Defect Possible Causes Action Select the correct Fusion Program, and Wrong fiber type selected repeat fusion splicing. Repeat fiber preparation and fusion Faulty cleave Bubbling splicing. Repeat fiber preparation and fusion Dirty fiber end splicing. Degradation of electrodes Replace the electrodes.
  • Page 82 Fusion Splicing Defect Possible Causes Action Wrong Fusion Program Select the correct Fusion Program, and selected repeat fusion splicing. Excessive fiber feed Adjust the fiber feed amount. Thickening Degradation of electrodes Replace electrodes. Perform an arc check, and adjust arc Excessive arc current power.
  • Page 83 Fusion Splicing 7.1.7. Removing the Spliced Fiber Raise both heater clamps before removing the fiber. Open the windshield. A tension test (1.96N) is performed on the fibers. Buzzer beeps once when the tension test is completed. Open the lid of both fiber holders. 5.
  • Page 84 Fusion Splicing 7.1.8. Reinforcing the Fusion Splice 1. Slide the splice protection sleeve over the splice. 2. Place the spliced fiber in the heater – Right-side first – to force the Right heater clamp to close. 3. Ensure that the splice protection sleeve rests in the middle section of the heater and that the stainless steel rod in the sleeve faces down.
  • Page 85 Fusion Splicing If protection sleeve is placed incorrect position during heater cycle, this may cause a shrinking error. 5. Close heater cover. 6. When fiber is set and left clamping is shut, the HEAT LED turns on red and the heating starts automatically.
  • Page 86 Fusion Splicing The heating process is displayed in the LCD monitor with status icons as below. When the heating and cooling operations are completed, a beep sound is heard. Indicator State Blue：In ready mode. Red：In heating mode. Orange: In preliminary heating mode. In cooling mode.
  • Page 87 Fusion Splicing normal heating excessive heating Decrease the heating temperature. insufficient heating Extend the heating time. STOP using the fusion splicer when problems are experienced with the protection sleeve heater. Turn off the power immediately, disconnect the power cord, remove the batteries, and contact service center. WARNING DO NOT touch the heater element during the heater cycle and right after the heat process is complete.
  • Page 89 Programming Guide 8. Programming Guide 8.1. Programming Functions and Menu To start programming, user needs to access each function through Menu screen. 1. Press Menu (function) key to access the Menu screen. Menu key is available in the Ready screen and splice screens.
  • Page 90 Programming Guide Menu Item Features Content Check arc intensity and automatically optimize to Perform arc proper level. check See “Arc Check, Getting Started”. Arc Check Perform a self Automatically diagnose condition of machine. machine check Measure and indicate fiber’s clad diameter, core Measure fiber diameter, core offset between fibers, cleaving angles and/or gap between fibers.
  • Page 91 Programming Guide Menu Item Features Content Fiber edge check Check and measure of the fiber edge. Manage Splice Check previous splicing data, add comment, erase Data the data or transfer the data to PC. Obtain arc check Check arc data, add comment, erase the data or data transfer the data to PC.
  • Page 92 Programming Guide Menu Item Features Content List all available heat programs for fiber Show heat reinforcement. User can select any from the list. program list. See “Load programs”. Heater PRGM List all available fusion splicing programs. User Show fusion can select any from the list. program list See “Load programs”.
  • Page 93 Programming Guide Menu Item Features Content Save frequently used screen with short cut key, so Set up short cut user can immediately access desired screen, when necessary. Short Cut Set up Set up default language, login name, sleep parameters function, splicing start pattern, etc. Get arc discharge times and/or splice counts.
  • Page 94 Programming Guide Menu Item Features Content Replace/Clean electrodes Clean lens Step-by-step tutorial that illustrates how to replace/clean the electrodes, clean lens or clean Clean V groove V-grooves & fiber clamps. and fiber clamp. Clean main body. Maintenance Agent, Information of agent or representative representative information...
  • Page 95 Programming Guide 8.2. Program Edit 1. Select “PRGM Edit” in the Menu screen and press Enter key. 2. Select “Fusion” or “Heater” and press Enter key. The following procedures and pictures are for Fusion program editing; however, the same procedure can be applied to the Heat programs.
  • Page 96 Programming Guide 8.2.1. Setting 1. Select “Modify” and press Enter key in the pop-up menu. 2. Select “Splice” or “Inspect” tab with◄ ► keys. Select parameters with ▲ ▼ keys and press Enter to edit. 3. Change the parameter with ◄ ► keys (increase/decrease appropriate digits) and/or ▲...
  • Page 97 Programming Guide 8.2.2. Detail Setting 1. Select “Detail Setting” and press Enter key in the pop-up menu. 2. A more detailed set of parameters is possible. The setting method is the same as "Setting". Press ▲ ▼ keys : to move one by one item Press Enter key : to move to next page...
  • Page 98 Programming Guide 8.2.3. Default Follow the procedures shown below to reset the modified program to the default parameters. 1. Select “Default” from Menu screen and press Enter key in the pop-up menu. The pop-up message window appears. 2. Press Enter key. 3.
  • Page 99 Programming Guide 8.2.4. Copy Follow the procedures shown below to copy the selected program and paste it to a new location. 1. Select “Copy” and press Enter key in the pop-up menu. 2. Select a new destination for the program. The locations of the factory pre-installed programs can not be selected.
  • Page 100 Programming Guide 8.2.6. Edit Comment Follow the procedure shown below to edit the comment of the selected program. 1. Select “Edit Comment” and press Enter key. 2. The screen shows current comment in the upper window and characters available for editing in the lower window.
  • Page 101 ♦ Optimizing fusion parameters may call for other precise procedures, especially in the case of splicing various unlisted types of fibers. There are several hidden parameters which need to be taken into account when adjusting for optimum parameters. Contact FURUKAWA ELECTRIC CO.,LTD. or your local representative to get more information.
  • Page 102 Programming Guide 8.2.7. Parameter Table Parameter Table for Fusion Program Parameter name Description For Splice Arc Start Power Starting arc power in 1 arc discharge Arc End Power Ending arc power in 1 arc discharge Arc Start Power Starting arc power in 2 arc discharge Arc End Power Ending arc power in 2...
  • Page 103 Programming Guide Parameter name Description Pulling back distance from the final overlapping Z Pull Distance [µm] 32767 position [µm] Z Push Type Z motor moving when splicing 0:ZL, 1:ZR, 2:Both Allowable numbers for the repeat arc in programmed Re Arc Times [times] additional arc mode Re Arc Duration [ms] 32767 Duration of additional arc [msec]...
  • Page 104 Programming Guide Parameter name Description Maximum permissible gap difference before splicing Gap Difference [µm] 99.99 [µm] 8-16...
  • Page 105 Programming Guide Time chart of fusion parameters Time flow Collision of Fibers 1st Arc 2nd Arc Arc Power 2nd Arc Start 1st Arc End Power Power 2nd Arc End 1st Arc Start Power Power 1st Arc Duration 2nd Arc Duration Z Distance Feeding Z Push Distance Z Pull Distance...
  • Page 106 Programming Guide Arc power compensation table Arc Power Cleaning Arc Power Fusion Arc Power Repeat Arc Power Cleaning Power Offset Repeat Arc Power Offset Environment sensor Compensation Real Time Arc Control (*１) “+” marked terms are taken account to calculating each arc power  ...
  • Page 107 Programming Guide Parameter Table for Heater Program Parameter name Description Heat Temp IN [deg.C] 280 Temperature of INNER heater for the first half. Heat Temp OUT [deg.C] 280 Temperature of OUTER heater for the first half. Heat Time [sec] 300 Operation time of the first half. Heat Temp IN [deg.C] 280 Temperature of INNER heater for The latter half.
  • Page 108 Programming Guide Parameter name Description Setting for automatic start function. [0] : The non-operation. Manual start operation. Auto Start [1]]: The operation. When fiber set and left clamping is shut, the heating start automatically.* [2]: The operation. Consecutive heating operation. Compensation Auto Start Expansion time of the automatic operation.
  • Page 109 Programming Guide Time chart of heater parameters 8-21...
  • Page 110 Programming Guide 8.3. History By selecting “History” in the Menu screen, the operator can access detailed splice data, arc check history and image archives; user can also add comments to each individual data point. The data also can be transferred/ uploaded to PC or deleted from memory. In the Menu screen, select the “History”...
  • Page 111 Programming Guide Data Title Description CMNT Comment of the data, which can be edited. No. 1 is the data for the last splice and the number increases for older splices. Arc Count Arc Count when splice was performed. Date Date and time for the splice performed. The environmental temperature and the air pressure, when Env.
  • Page 112 Programming Guide Data Title Description Value of the strength of the electric discharge when splicing Arc Power (It is calculated from each program on the basis of the value of “Common arc power” in Setting menu.) Retreat Retreat value in arc check Center Retreat center position in arc check Loss...
  • Page 113 When you first connect the S123 to a PC, install driver software for S123 on your PC. Ask your representative or The Furukawa Electric to obtain the driver software. Follow the procedures shown below to upload the data to PC.
  • Page 114 Programming Guide Select an appropriate communication port (COM2, for example) from “Connect To” screen. Cancel the “Port Setting” window. In HYPER TERMINAL menu. Select Transfer then Capture Text. Name TEST for example. And remember location that TEST will be stored in. (Default would be C: / Program files/ Accessory/Hypertext.) Now HYPER TERMINAL is ready for receiving data.
  • Page 115 Programming Guide 8.3.2. Image Capture 1. The list of the captured photos is displayed. 2. Select a photo and press Enter key to show the image and data as shown in the picture. 3. Press Menu key and the pop-up shows available functions. Select desired function and press Enter to initiate the operation.
  • Page 116 Programming Guide Follow the same procedure for Spice Data. The data displayed are as follows; Sample Description 001 SM12 Name of the Fusion Program 00319 Arc Count when splice was performed. READY Splicing process when the image is captured. X Field/Y Field X or Y image 32 °C ...
  • Page 117 Programming Guide 8.4. Tool This menu provides with various kinds of utility functions. 1. Select “Tool” in the Menu screen and press Enter key. 2. Select a Sub-Menu in the table below and press Enter key. 3. Press the Escape key repeatedly to return to the Ready screen. Sub-Menu Function Machine Check...
  • Page 118 7. If the machine fails Machine Check, the pop-up screen shows “Status NG. Call the Service Center”. Please call your representatives or The Furukawa Electric for further assistance. 8. If arc check fails, pop-up screen shows “Status NG. Remove fibers, and retry Arc Check”.
  • Page 119 Programming Guide When carrying out "Machine Check” function, please use fibers by which stripping, cleaning and cleaving were performed right. When the result is “ Status NG “, please refer to “ 9. Maintenance and Handling Instruction” about disposal. 8-31...
  • Page 120 Programming Guide 8.4.2. Fiber Measuring The S123 performs an auto or manual inspection of the fiber (specifically, the clad offset, gap, fiber tilt and relative cleave angle). 1. Select “Fiber Measuring” in the “Tool” screen and a sub-menu is displayed. Fiber feed &...
  • Page 121 Programming Guide Measuring results (example 4 ribbon fibers) The results are shown as the pictures. The following parameters are measured. Press ▲▼ keys to change the parameters. PARAMETER DESCRIPTION CLAD OFF Amount of CLAD OFFSET between the two fibers [µm] ANGLE L Cleave angle of the left fiber [degree] ANGLE R...
  • Page 122 Programming Guide PARAMETER DESCRIPTION CLAD W L Clad width of the left fiber [µm] CLAD W R Clad width of the right fiber [µm] TILT L Tilt angle of the left fiber clad center [degree] TILT R Tilt angle of the right fiber clad center [degree] 8.4.3.
  • Page 123 Programming Guide 8.4.4. Manual Splicing It allows the entire cycle of splicing to be operated manually using the keypad. 1. Select “Manual Splicing” in the Tool menu screen and press Enter key. 2. Select the preferred operating mode and press Enter key. Load fibers before selecting “Semi Auto”.
  • Page 124 Programming Guide Variables which can be manipulated Command Setting Menu Description Activate left fiber feeding Motor Activate right fiber feeding Activate up-down fiber clamp ◄ Drive the motor leftward Move Drive the motor rightward ► HIGH Selecting high speed for motor movement Speed Selecting low speed for motor movement FREE...
  • Page 125 Programming Guide 8.4.5. Image Capture The S123 allows the user to store and delete fiber images. 1. Select “Image Capture” and press Enter key. 2. Select “Capture” to capture and store image or “Delete data” to delete the image and press Enter key. <Capture>...
  • Page 126 Programming Guide 8.4.6. Adjusting shrinking condition of sleeve Optimizing shrinking condition for the sleeve 1. Select “Sleeve Shrink Adjustment“. Select a pattern (A-E) that is similar to the current shrinking condition of the sleeve. And press Enter key. Code Condition of sleeve / Content Not shrinking enough at sleeve end Bubble in the center of sleeve Fiber coating melts...
  • Page 127 Programming Guide 8.4.7. Fiber edge inspection Measuring cleave angle. 1. Select ”Fiber edge inspection“ and press Enter key. 2. Set the fiber you want to measure. And, close the windshield and press key. Then, fibers are fed. And cleave angles are displayed on the right side of the screen after cleaning arc discharge.
  • Page 128 Programming Guide 8.5. Setting The following functions are available in Setting. The initial setting is following bold character setting. 1. Select “Setting” in the Menu screen and press Enter key. 2. Select Sub-Menu and press Enter key. 3. Select Setting item and press Enter key. 4.

  • Page 129: Table Of Contents

    Programming Guide Sub-Menu Setting item Contents Activating auto start mode Active( It depends on the Auto-start mode of the selected ) / Auto( heating program It doesn't depend on the heating Auto Start for Heater ) / Cancel ( program. Heating starts automatically. It doesn't depend on the heating program.
  • Page 130 Programming Guide Sub-Menu Setting item Contents Selecting buzzer tone Buzzer Tone +2 / +1 / 0 Selecting power save mode Sleep Type ALL / LCD / OFF Setting time for auto power off Sleep Time 1/ 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / 10 (min.) Selecting calendar format Calendar Format YYMMDD / MMDDYY / DDMMYY...
  • Page 131 Programming Guide Sub-Menu Setting item Contents Activating tension test Tension Test Active / Cancel Selecting direction of LCD screen Direction of Monitor Front / Rear Activating Fiber Clamp moving Clamp Up & Down Active / Cancel (Active: The fiber clamp moves up and down automatically when the axis offset is large.) Battery mode Selecting battery use type.
  • Page 132 Programming Guide *) The fiber seemed to have jumped up on the LCD screen when clamping was gone up and down. It is because clamping is temporarily opened. It is not abnormal. Sub-Menu Setting item Contents Counter Reset Reset counter to zero Alarm Activating alarm Alarm Count...
  • Page 133 Programming Guide Sub-Menu Setting item Contents Clock Setting date and time LCD Adjustment Adjustment LCD backlight, brightness and contrast About Machine Information on machine Machine serial Number Software version 8-45...
  • Page 134 Programming Guide 8.5.1. Parameter 1. Select a Setting item in the “Parameter“ list and press Enter key. 2. Pop-up window shows the current setting. Press ▲ ▼ keys to scroll the available settings and press Set key to change. 3. Press Escape key and a pop-up window will ask the operator to confirm the change. Select “Overwrite”...

  • Page 135: Auto Start For Heater

    Programming Guide Language Select the display language Auto Start for Fusion 『Cancel ⇔ Active ⇔ Semi Auto』 Auto Start function does not work. 『Cancel』 After setting fibers, even if you do not press the start key, splicing process is 『Active』 started by closing the windshield.

  • Page 136: Data Output

    Programming Guide Data Output Select display mode (display or hide) inspection data   『Cancel ⇔ Active ⇔ PC』 『Cancel』 Not display The data is displayed on the LCD screen. 『Active』 Output the data with the PC connected by USB cable. 『PC』...
  • Page 137 Programming Guide Splicing flow by Parameter setting Splicing process and display image by setting of “Stepping Action”, “Data Output” and “Auto Start” are as follows. 1. Fiber setting 2. 1 Setting line 3. Cleaning Arc 4. 2 Setting line Process Parameter setting Cancel...
  • Page 138 Programming Guide *2: Setting “PC” is same process as “Active” setting. 5. Inspection 6. Splicing 7. Complete Process Parameter setting Cancel Complete Stepping Type1 Pause Complete Action Type2 Pause Complete Cancel Complete Data Pause and display Output Active Complete the data Auto Cancel Complete...

  • Page 139: Buzzer Tone

    Programming Guide Buzzer Sound Setting Buzzer volume 『2 ⇔ 1 ⇔ 0』 ⇔ 0 』 『2 ⇔ Laud ⇔ Small ⇔ Mute Buzzer Tone Selecting the buzzer tone. 『2 ⇔ 1 ⇔ 0』 Sleep Type Selecting the power save type  ...

  • Page 140: Sleep Time

    Programming Guide Sleep Time Time until shifting to the state of the power saving is set from 1 to 10 minutes. 『10 ⇔ 9 ⇔ 8 ⇔ ・・・・・⇔ 1』 Calendar Format Setting the display style of the date on the screen  ...

  • Page 141: Active / Cancel

    Programming Guide Sensor 『Active ⇔ Cancel』 Depending on the change in barometric pressure of the environment, the 『Active』 strength of the arc discharge is corrected automatically. 『Cancel』 Cancel Real Time Arc Control Activating Real Time Arc Control. 『Cancel ⇔ Active』 Zoom Image 『Cancel ⇔...
  • Page 142 Programming Guide Tension Test 『Active ⇔ Cancel』 Tension test starts by opening the windshield. Tension is 1.96N. 『Active』 Reset has been completed, unless the optical fiber is broken, the tension test is passed. Remove the spliced fiber carefully. 『Cancel』 Cancel tension test Direction of Monitor Selecting direction of LCD screen 『Front ⇔...
  • Page 143 Programming Guide Clamp Up & Down 『Active ⇔ Cancel』 Activating Fiber Clamp moving (Active: The fiber clamp moves up and down automatically when the axis offset is large.) Battery Mode 『2 batt. ⇔ 1 batt.』 Selecting use type, 2batt.(parallel) or 1batt.(serial) Illumination Lamp Adjusting the brightness of the lamp.
  • Page 144 Programming Guide Total arc Counter Displaying total arc count Only displays the current count and cannot be edited. Charge Select The priority settings for the battery to be charged   『Low ⇔ High』 Lower residual voltage battery is charged with priority. 『Low』...
  • Page 145 Programming Guide 8.5.2. Counter 1. Select a Setting item in the “Counter“ list and press Enter key. 2. Pop-up window shows available functions. Press ▲ ▼ keys to select desired function and press Enter key. 3. Pop-up window shows available setting. Press ▲ ▼ keys to select desired setting and press Enter key.
  • Page 146 Programming Guide Available settings for each Item Functions Setting Title Counter Reset Alarm On/Off Alarm Count Displaying the current count can be Do not Reset Cleaving adjusted to any count. Select a digit with Stripping Reset ◄ ► and press ▲▼to increase/decrease Splicing the value.
  • Page 147 Programming Guide 8.5.3. Clock 1. The setting screen is displayed as shown in the picture to the right. 2. Press keys select setting item ▲ ▼ (Day/Month/Year/Hour/Minute) and press Adjust key. 3. Select digit with ◄ ► press ▲ ▼ to increase/decrease the value, and press Set key.
  • Page 148 Programming Guide 8.6. Shortcut The S123 allows the user to register a frequently used screen onto a “Shortcut”, and advance to that particular screen quickly. <Registering> 1. Select “Shortcut” in the Menu screen and keep pressing Enter key until the second beep sounds. 2.
  • Page 149 Programming Guide 8.7. Maintenance The S123 allows the user to obtain procedure and pictures for maintenance. 1. Select “Maintenance” in the Menu screen and press Enter key. 2. Select item from following list and press Enter key. Replace/Clean electrodes Cleaning for lens Cleaning V groove and fiber clamp 3.
  • Page 151 Maintenance and Handling Instructions 9. Maintenance and Handling Instructions 9.1. Error Messages The following is a list of major error messages that can be observed. Refer to the following table for trouble-shooting. Error Messages Error Description Cause of the error Action Check and correct the Wrong Fusion program...
  • Page 152 Maintenance and Handling Instructions Error Messages Error Description Cause of the error Action Push the button to move fiber clamps for correcting axis offset, or Fiber clamps do not put the fiber on the hold the fibers. V-groove again after opening the windshield, and retry inspection.
  • Page 153 Maintenance and Handling Instructions Error Messages Error Description Cause of the error Action SPLICE DEFECTS See “Splicing Defects, Fusion Splicing”. FEEDING ERROR The motor does not Defect in the motor (with name of the stop after the time limit Contact service center. driving system.
  • Page 154 Maintenance and Handling Instructions Error Messages Error Description Cause of the error Action Incorrect parameter is Check and correct the Heater Error No.13 set for heating. heating parameters. Incorrect parameter is Check and correct the set for heating. heating parameters. Heater Error No.17 Recharge the battery.
  • Page 155 Maintenance and Handling Instructions Error Messages Error Description Cause of the error Action The temperature Defect in the heating OVER TEMP. Contact service center. exceeds the set value system. while heating. Inappropriate fiber Check and correct the The fiber is out of program is selected.
  • Page 156 Maintenance and Handling Instructions Error Messages Error Description Cause of the error Action Electric discharge Inappropriate arc The "Real Time Arc Please set up “Real became unstable under Please perform arc Control" function does the influence of dirt, Time Arc Control” check and retry not work normally.
  • Page 157 Maintenance and Handling Instructions 9.2. Maintenance 9.2.1. Arc Check Perform an arc check whenever high splice losses are observed (see 7.1.1). 9.2.2. Electrode Maintenance Inspect the electrodes for dirt, wear and damage before using the fusion splicer. Dust and other particles can be cleaned off by removing the electrodes from the splicing mechanism and polishing the surface of each electrode with the electrode sharpener.
  • Page 158 Maintenance and Handling Instructions ♦ Always replace or clean both electrodes, even if only one electrode is damaged. ♦ Be sure to turn off the Power switch before starting maintenance. Never touch the electrode while the Power is on. ♦ Longer arc duration used in dissimilar fiber splicing requires the electrodes to be cleaned and replaced more often.
  • Page 159 Maintenance and Handling Instructions a) Firmly stick the tip of an electrode (approx. 0.5 – 1.0 mm) into the electrode sharpener and turn/twist the electrode 3-4 times. Attention: Don’t grasp the electrode knob (if possible, grasp a section of the electrode rod). b) In an effort to clean the electrode tip, wipe it softly with BEMCOT dipping ethyl alcohol.
  • Page 160 Maintenance and Handling Instructions 9.2.3. Cleaning the V-grooves ♦ Dirt on the V-grooves or fiber clamps will offset the alignment of the fibers or cause stress points on the glass, making the fiber weak. At first, please clean up the V groove by cleaning brush(VGC-01) in the standard components. Prepare a piece of fiber and cleave it approximately 10mm from the end.
  • Page 161 Maintenance and Handling Instructions 9.2.4. Cleaning the V-groove Fiber Clamps Two Fiber Clamps are located in the windshield to help press the fiber into the V-grooves. Open the windshield. Clean the top of the fiber clamps with a cotton swab soaked with denatured alcohol. (Use ethanol of more than 99% purity.) The V-groove is made of a brittle ceramic material.
  • Page 162 Maintenance and Handling Instructions 9.2.5. Cleaning the Fiber Holder Keep the rubber and groove of the fiber-holder clean. When they are dirty, fiber is sometimes slippery at the tension test. Wipe the rubber and groove with a lint-free tissue and a cotton bud, etc soaked with denatured alcohol.
  • Page 163 Maintenance and Handling Instructions 9.3. Backup Battery S123 has the backup battery other than the battery that operates the splicer. The backup battery is for the calendar and the memory preservation. The backup battery is rechargeable. When the S123 is turned on, the backup battery is charged. The backup battery can be used during about half a year by the full charge of 14 hours.
  • Page 164 In the event of carrier responsibility, The Furukawa Electric Co., Ltd. will allow for the repair or replacement of the S123 fusion splicer or component while a claim against the carrier is being processed.
  • Page 165 Maintenance and Handling Instructions 9.6. Return Shipments to Furukawa Electric Co. The Furukawa Electric Co., Ltd. will only accept returns for which an approved Return Material Authorization (RMA) has been issued by The Furukawa Electric Co., Ltd. customer service personnel. This number must be obtained prior to shipping any material back to The Furukawa Electric Co., Ltd.
  • Page 167 Option Option 10.1. Battery Charger：S958C Charger for S943(B) battery Input jack for S976A Power indicator Input jack for S977A Green lighting : Turning ON Red & Green blinking : Power trouble CHARGE indicator Red lighting  : During charge Green lighting: Charge complete Red &...
  • Page 168 Option ★Charging The number of the battery which S958C charger can charge at the same time depends on the   AC adapter. Therefore, the S958C charger has two kinds of jacks that connect the AC adaptor. Chage mode AC adaptor contents Parallel S976A...
  • Page 169 Option For charging the Battery, insert the Battery pack squarely into the slot of the charger. If the battery pack sits in the charger at an angle, the battery may not charge and charging errors may occur. In such a case, remove the battery pack, and replace into the charger taking care to seat it correctly.
  • Page 170 Option 10.2. Cooling Tray：CTX-01 Tray to cool sleeve after heating Set it in the back of the main body. Cooling Tray                         Setting Cooling Tray             10-4...
  • Page 171 Option 10.3. Working Belt：WBT-01 Adjust the length of the belt according to the body.   Connect each belt on each hook, put the fusion splicer, and fix with metal fittings. 10-5...
  • Page 172 Option 10.4. Cleaning Brush：VGC-01 It is used to remove the garbage that adheres to V-groove and the fiber clamp. 10-6...
  • Page 173 Option 10.5. Hard carrying case：HCC-02 The lid of the Hard carrying case can be remove. How to remove is as follows. Open the case. Remove the stopper screw Slide the lid and remove. 10-7...
  • Page 174 Option 10.6. Tripod adaptor：TPA-01 Fix Tripod adaptor to the rear surface of the Bottom case with 4 screws. Tripod adaptor 10-8...
  • Page 175 When you dispose S123 fusion splicer or standard components, follow your local disposal regulations, or contact the Furukawa Electric Co., LTD or your local representative. To recycle, disassemble it first and sort each part by material and follow your local recycling regulations.
  • Page 176 Recycling and Disposal S123 has a backup battery for backup memory and calendar. How to take off a battery is indicated in the following. Removing the built-in battery Built-in Battery 1. Remove the 4 screws, and 2. Remove wiring 3. There is the built-in battery remove the bottom case.
  • Page 177 For sales and service information, contact FURUKAWA ELECTRIC CO.,LTD. or your local representative.
  • Page 178 Sales Department: Fiber Optics & Applications Global Sales & Marketing Telecommunications Company Furukawa Electric Co., Ltd. 2-3, Marunouchi 2Chome, Chiyoda-ku, Tokyo 100-8322 JAPAN TEL：+81-3-3340 FAX：+81-3-3286-3978 Service Department: CS2 Group Access Network Department FITEL Products Division Telecommunications Company Furukawa Electric Co., Ltd.

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