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Agilent 83491/2/3/4A Clock Recovery Modules User`s Guide

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1. Operating power level applies over temperature range 25 C 5 Better than 10 BER when tested with PRBS 2 1 pattern Better than 10 BER when tested with PRBS 27 1 pattern Measured on an oscilloscope eye diagram with PRBS 22 1 test pattern Specifications and Regulatory Information 83493A Specifications 83493A Specifications Table 4 3 83493A Specifications Wavelength range characteristic 1000 nm to 1600 nm Optical INPUT fiber characteristic 9 125 single mode Optical insertion loss through path 1 5 dB Optical return loss gt 28 dB Clock Recovery Phase Locked Loop Bandwidth characteristic Internal Path Triggering 50 to 70 kHz External Output 4to5MHz Clock recovery rates NRZ coding 155 52 Mb s 30 196 622 08 M b s 30 196 1250 M b s 30 196 2488 32 Mb s 30 196 2500 00 M b s 30 196 Data triggering characteristic 50 M b s to 2500 M b s Operating input power level Triggering operation all rates 20 dBm to 3 dBm 10 BER all rates 17 dBm to 3 dBm Output jitter all rates 0 0125 Ul Maximum continuous optical power before damage characteristic 10 mW peak DATA and CLOCK output amplitude all rates characteristic 0 5Vp p DATA and CLOCK output electrical return loss 50 M Hz through 2500 M Hz characteristic gt 10 dB 2 5 GHz through 10 GHz characteristic gt 8 dB a Tested with FC PC adapter Optical output terminated without 33 dB return loss 4 6
2. Specifications and Regulatory Information 83493A Specifications b Source extinction ratio 2 8 2 dB when measured per TIA EIA OFSTP 4A C Operating power level applies over temperature range 25 C 5 d Better than 10 BER when tested with PRBS 22 1 pattern e Measured on an oscilloscope eye diagram with PRBS 22 1 test pattern Specifications and Regulatory Information 83494A Specifications 83494A Specifications Table 4 4 83494A Specifications 1 of 2 Wavelength range characteristic Optical INPUT fiber characteristic Optical insertion loss through path Optical return loss Clock Recovery Phase Locked Loop Bandwidth characteristic Internal Path Triggering External Output Clock recovery rates NRZ coding 155 52 M b s 622 08 M b s 2488 32 M b s 2666 06 M b s Options 106 and 107 9953 00 M b s Standard 10312 500 M b s Option 103 10664 228 M b s Option 106 10709 225316 M b s Option 107 Data triggering characteristic Operating input power level Triggering operation 9953 00 Mb s 10312 500 M b s 10664 228 M b s and 10709 225316 M b s Triggering operation all other rates 10 BER all rates 1200 nm to 1600 nm 9 125 single mode 1 5 dB gt 28 dB 90 kHz 4to5MHz 30 196 30 196 30 196 30 196 0 03 0 03 0 03 0 03 50 M b s to 2500 M b s 8 dBm to 3 dBm 12 dBm to 3 dBm 14 dBm to 3 dBm typical 0 dBm 4 8 Specifications and Regulatory I
3. module are they connected properly and operating correctly Review the procedure for the test being performed when the problem ap peared Are all the settings correct Can the problem be reproduced Are the connectors clean See Cleaning Connections for Accurate Measure 3 3 Quuou 0u m Reference In Case of Difficulty ments on page 3 9 for more information Make sure that the instrument is ready to acquire data Find any signals on the channel inputs by using the Autoscale function See if any signals are present at the channel inputs by using F reerun triggering Make sure Channel Display is on Make sure the channel offset is adjusted so the waveform is not clipped off the display Make sure the mainframe identifies the plug in module One the 86100 series DCA select the AIl Calibrations command on the Cal ibrate menu Confirm that the Model number and Serial Number are listed in the displayed dialog box On the 83480A DCA press Utility then System config Confirm that the Model number is listed in the box labeled Plug ins If known is displayed in stead of the model number of the plug in module remove and reinsert the plug in module in the same slot If known is still displayed the mainframe may need to have the latest operating system firmware installed Options 001 and 002 provide this firmware on a 3 5 inch diskette To load new firm ware follow the instructions provided
4. 1 An Agilent 83493A installed in an Agilent 83480A mainframe 1 3 WARNING WARNING WARNING WARNING CAUTION CAUTION Getting Started General Safety Considerations General Safety Considerations This product has been designed and tested in accordance with the standards listed on the Manufacturer s Declaration of Conformity and has been supplied in a safe condition The documentation contains information and warnings that must be followed by the user to ensure safe operation and to maintain the product in a safe condition The 83491 2 3 4A modules work only with Agilent digital communication ana lyzer mainframes Refer to the mainframe documentation to ensure safe oper ation Light energy can radiate from the front panel OUTPUT connectors on 83492A 83493A and 83494A modules The light emitted from these connectors is the slightly attenuated light that is input to the front panel INPUT connector If this instrument is not used as specified the protection provided by the equipment could be impaired This instrument must be used in a normal condition in which all means for protection are intact only To prevent electrical shock disconnect the mainframe from mains before cleaning Use a dry cloth or one slightly dampened with water to clean the external case parts Do not attempt to clean internally No operator serviceable parts inside Refer servicing to qualified personne
5. 83491A clock recovery module Connect the probe power cable to the Probe Power connector on the reference receiver module Attach the probe tip to the CAL hook that is located near the floppy disk drive Press the reference receiver module s front panel channel SETUP key Press Calibrate and then Calibrate probe To compensate for other devices The information in this section applies to both optical and electrical measure ments Since the mainframe s CAL signal is a voltage source it cannot be used to calibrate to the probe tip when the units are set to Ampere Watt or Unknown Instead set the external gain and external offset to compensate for the actual characteristics of the device If you do not know the actual charac teristics you can refer to the typical specifications that came with the device Press the reference receiver module s front panel channel SETUP key Press External scale Press Atten units Ratio Attenuation 1 1 and then Units Ampere Volt Watt or Unknown Press Ext gain and enter the actual gain characteristics of the device Press Ext offset and enter the offset introduced by the device Front Panel Optical Adapters 3 2 In Case of Difficulty 3 3 Error Messages 3 5 Electrostatic Discharge Information 3 7 Cleaning Connections for Accurate Measurements 3 9 Reference Reference Front Panel Optical Adapters Front Panel Optical Adapters Front Panel Fiber Optic Des
6. 9 mm 5 18 in x 3 15 in x 10 5 in Power Requirements Supplied by mainframe 4 10 Specifications and Regulatory Information Regulatory Information Regulatory Information Notice for Germany Noise Declaration Acoustic Noise Emission Geraeuschemission LpA 70 dB LpA 70 dB Operator position am Arbeitsplatz Normal position normaler Betrieb per ISO 7779 nach DIN 45635 t 19 Notice for Canada Compliance with Canadian EMC Requirements This ISM device complies with Canadian ICES 001 Cet appareil ISM est conforme a la norme NMB du Canada 4 11 Specifications and Regulatory Information Regulatory Information 4 12 Index Numerics 83494A 4 8 A adapter cable 1 9 Agilent 54701A active probe 2 12 Agilent 83492A maximum input level 1 10 Agilent Technologies contacting 1 12 B Bellcore GR 253 CORE 2 4 block diagram 2 6 built in information system 2 2 bypass mode 2 4 C cabinet cleaning 1 4 calibration cycle 4 2 care of cabinet 1 4 care of fiber optics 1 3 channel key 1 3 setup 1 3 Channel key 2 2 characteristics defined 4 2 cleaning adapters 3 18 cabinet 1 4 fiber optic connections 3 9 3 17 non lensed connectors 3 17 CLOCK Auxiliary Output connector 2 5 compensation Agilent 54701A active probe 2 12 insertion loss 2 10 other devices 2 12 passive probe 2 11 compressed dust remover 3 16 connector care 3 9 Contents topic 2 2 cotto
7. Service Center Getting Started Returning the Instrument for Service Returning the Instrument for Service The instructions in this section show you how to properly return the instru ment for repair or calibration Always call the Agilent Technologies Instrument Call Center first to initiate service before returning your instrument to a ser vice office This ensures that the repair or calibration can be properly tracked and that your instrument will be returned to you as quickly as possi ble Call this number regardless of where you are located If the instrument is still under warranty or is covered by an Agilent Technolo gies maintenance contract it will be repaired under the terms of the warranty or contract the warranty is at the front of this manual If the instrument is no longer under warranty or is not covered by an Agilent Technologies mainte nance plan Agilent Technologies will notify you of the cost of the repair after examining the unit When an instrument is returned to a Agilent Technologies service office for servicing it must be adequately packaged and have a complete description of the failure symptoms attached When describing the failure please be as spe cific as possible about the nature of the problem Include copies of additional failure information such as the instrument failure settings data related to instrument failure and error messages along with the instrument being returned Contacting Agi
8. Specifications 4 10 Regulatory Information 4 11 Specifications and Regulatory Information Specifications Characteristics Calibration cycle Specifications and Regulatory Information Specifications and Regulatory Information Specifications and Regulatory Information This chapter lists specifications and characteristics of the clock recovery mod ules Specifications apply over the temperature range 15 C to 35 C unless otherwise noted after the instrument s temperature has been stabilized after 60 minutes of continuous operation Specifi cati ons described warranted performance Characteristi cs provide useful nonwarranted information about the func tions and performance of the instrument Characteristics are printed in italics Agilent Technologies warrants instrument specifications over the recom mended calibration interval To maintain specifications periodic recalibrations are necessary We recommend that the Agilent 83491 2 3 4A be calibrated at an Agilent Technologies service facility every 24 months 4 2 Specifications and Regulatory Information 83491A Specifications 83491A Specifications Table 4 1 83491A Specifications Clock Recovery Phase Locked Loop Bandwidth characteristic Internal Path Triggering External Output Clock recovery rates NRZ coding 155 52 Mb s 622 08 M b s 1062 50 M b s 1250 Mb s 2125 00 Mb s 2488 32 Mb s 2500 00 M b s Data triggering characteris
9. Use fusion splices on the more permanent critical nodes Choose the best con nector possible Replace connecting cables regularly Frequently measure the return loss of the connector to check for degradation and clean every connec tor every time All connectors should be treated like the high quality lens of a good camera The weak link in instrument and system reliability is often the inappropriate use and care of the connector Because current connectors are so easy to use there tends to be reduced vigilance in connector care and cleaning It takes only one missed cleaning for a piece of grit to permanently damage the glass and ruin the connector Measuring insertion loss and return loss Consistent measurements with your lightwave equipment are a good indica tion that you have good connections Since return loss and insertion loss are key factors in determining optical connector performance they can be used to determine connector degradation A smooth polished fiber end should pro duce a good return loss measurement The quality of the polish establishes the difference between the PC physical contact and the Super PC con nectors Most connectors today are physical contact which make glass to glass connections therefore it is critical that the area around the glass core be clean and free of scratches Although the major area of a connector excluding the glass may show scratches and wear if the glass has maintained its polished sm
10. connector make the measurement and then immediately clean it off Never use a gel for longer term connections and never use it to improve a damaged connector The gel can mask the extent of damage and continued use of a damaged fiber can transfer damage to the instrument When inserting a fiber optic cable into a connector gently insert it in as straight a line as possible Tipping and inserting at an angle can scrape material off the inside of the connector or even break the inside sleeve of connectors made with ceramic material When inserting a fiber optic connector into a connector make sure that the fi ber end does not touch the outside of the mating connector or adapter Avoid over tightening connections Unlike common electrical connections tighter is not better The purpose of the connector is to bring two fiber ends together Once they touch tightening only causes a greater force to be applied to the delicate fibers With connec tors that have a convex fiber end the end can be pushed off axis resulting in misalignment and excessive return loss Many measurements are actually improved by backing off the connector pressure Also if a piece of grit does happen to get by the cleaning procedure the tighter connection is more likely to damage the glass Tighten the connectors just until the two fibers touch 3 14 Reference Cleaning Connections for Accurate Measurements Keep connectors covered when not in use
11. do not accept plug in mod ules designed for use with the Agilent 54710A 54720A Plug in is not supported System firmware upgrade is needed The mainframe may need to have the latest operating system firmware installed Options 001 and 002 provide this firmware on a 3 5 inch diskette To load the new firmware follow the instructions provided with the diskette If you do not have the optional diskette contact your local Agilent Technologies service office 3 6 Reference Electrostatic Discharge Information Electrostatic Discharge Information Electrostatic discharge ESD can damage or destroy electronic components All work on electronic assemblies should be performed at a static safe work station The following figure shows an example of a static safe work station using two types of ESD protection Conductive table mat and wrist strap combination Conductive floor mat and heel strap combination Building Ground T yn pi A fU ar vy we 1 Meg Ohm Resistor Q Figure 3 1 Static safe work station 3 7 WARNING Reference Electrostatic Discharge Information Both types when used together provide a significant level of ESD protection Of the two only the table mat and wrist strap combination provides adequate ESD protection when used alone To ensure user safety the static safe accessories must provide at least 1 MQ of isolation from ground Refer to Table 3 1 for infor
12. page 1 8 for the use of these cables 1 6 Getting Started Installation Step 2 Install the module Up to two modules can be inserted into the 86100 series or 83480A DCA main frame 1 Install the 83491 2 3 4A module into the left slot on the mainframe Installing the module into the left slot ensures that the supplied adapter cable will fit Finger tighten the knurled screw on the front panel of the plug in module to ensure that the module is securely seated in the mainframe AGILENT 83480A NE caooooooao O 5200000000 AGILENT Optical or Electrical 83491 2 3 4A Module Module settupb Figure 1 2 Position of modules in the mainframe 2 Clean all optical interfaces as described in Cleaning Connections for Accurate Measurements on page 3 9 before making measurements 1 7 83491A Module Oo 83493 4A Modules 83492A Module 1 N Ww Getting Started Installation Step 3 Connect the front panel cables Perform this step if you are installing an 83491A module Use the RF cable supplied with the module to connect the Electrical Output connector on the 83491A to the input on the adjacent measurement module Use the short 83491 20001 or long 83491 20002 cable depending on the lo cation of the input on the adjacent measurement module AGILENT 83480A Adapter Cable settupa Figure 1 3 The adapter cable Perform the following steps if you are installing an 83493 4A module B
13. the initial cleaning seems poor try cleaning the con nector again Often a second cleaning will restore proper performance The second cleaning should be more arduous with a scrubbing action To clean an adapter The fiber optic input and output connectors on many Agilent Technologies instruments employ a universal adapter such as those shown in the following picture These adapters allow you to connect the instrument to different types of fiber optic cables Figure 3 8 Universal adapters Apply isopropyl alcohol to a clean foam swab Cotton swabs can be used as long as no cotton fibers remain after cleaning The foam swabs listed in this section s introduction are small enough to fit into adapters Although foam swabs can leave filmy deposits these deposits are very thin and the risk of other contamination buildup on the inside of adapters greatly out weighs the risk of contamination by foam swabs Clean the adapter with the foam swab 3 Dry the inside of the adapter with a clean dry foam swab Blow through the adapter using filtered dry compressed air Nitrogen gas or compressed dust remover can also be used Do not shake tip or invert compressed air canisters because this releases particles in the can into the air Refer to instructions provided on the compressed air canister 83491A Specifications 4 3 83492A Specifications 4 4 83493A Specifications 4 6 83494A Specifications 4 8 83491 2 3 4A Operating
14. the nickel silver can be pushed onto the glass surface Scratches fiber movement or glass contamina tion will cause loss of signal and increased reflections resulting in poor return loss Inspecting Connectors Because fiber optic connectors are susceptible to damage that is not immedi ately obvious to the naked eye poor measurements result without the user being aware Microscopic examination and return loss measurements are the best way to ensure good measurements Good cleaning practices can help ensure that optimum connector performance is maintained With glass to glass interfaces any degradation of a ferrule or the end of the fiber any stray particles or finger oil can have a significant effect on connector performance Where many repeat connections are required use of a connector saver or patch cable is recommended Figure 3 5 shows the end of a clean fiber optic cable The dark circle in the center of the micrograph is the fiber s 125 um core and cladding which carries the light The surrounding area is the soft nickel silver ferrule Figure 3 6 shows a dirty fiber end from neglect or perhaps improper cleaning Material is smeared and ground into the end of the fiber causing light scattering and poor reflection Not only is the precision polish lost but this action can grind off the glass face and destroy the connector Figure 3 7 shows physical damage to the glass fiber end caused by either repeated connections made withou
15. with this diskette If you do not have the optional diskette contact your local Agilent Technologies service office refer to Contacting Agilent Technologies on page 1 12 If the model number of the plug in module is listed the mainframe has identi fied the plug in 3 4 m n n Reference Error Messages Error Messages This section provides description of error messages that are displayed if you are using the module in an 83480A DCA If you are using an 86100 series infi niium DCA refer to the instrument s help system for information on error messages displayed on that mainframe Memory error occurred in plug in Try reinstalling plug in The mainframe could not correctly read the contents of the memory in the plug in Remove and reinstall the plug in module Each time a plug in is installed the mainframe re reads the memory in the plug in module Verify the plug in module is firmly seated in the mainframe slot Verify the knurled screws at the bottom of the plug in module are finger tight Install the plug in in a different slot in the mainframe Busy ti meout occurred with plug in Try reinstalling plug in The mainframe is having trouble communicating with the plug in module Make sure there is a good connection between the mainframe and the plug in module Remove and reinstall the plug in module Verify the plug in module is firmly seated in the mainframe slot Verify the knurled s
16. 44102 Biconic dust cap 08154 44105 DIN dust cap 5040 9364 HM 10 dust cap 5040 9361 ST dust cap 5040 9366 To clean a non lensed connector Do not use any type of foam swab to clean optical fiber ends Foam swabs can leave filmy deposits on fiber ends that can degrade performance Apply pure isopropyl alcohol to a clean lint free cotton swab or lens paper Cotton swabs can be used as long as no cotton fibers remain on the fiber end after cleaning Clean the ferrules and other parts of the connector while avoiding the end of the fiber Apply isopropyl alcohol to a new clean lint free cotton swab or lens paper 4 Clean the fiber end with the swab or lens paper Do notscrub during this initial cleaning because grit can be caught in the swab and become a gouging element Immediately dry the fiber end with aclean dry lint free cotton swab or lens paper Blow across the connector end face from a distance of 6 to 8 inches using filtered dry compressed air Aim the compressed air at a shallow angle to the fiber end face Nitrogen gas or compressed dust remover can also be used 3 17 CAUTION Reference Cleaning Connections for Accurate Measurements Do not shake tip or invert compressed air canisters because this releases particles in the can into the air Refer to instructions provided on the compressed air canister As soon as the connector is dry connect or cover it for later use If the performance after
17. Agilent 83491 2 3 4A Clock Recovery M odules User s Guide e e e e e e 0 oe 050 AE Agilent Technologies O Copyright 2000 2004 Agilent Technologies All Rights Reserved Repro duction adaptation or trans lation without prior written permission is prohibited except as allowed under copy right laws Agilent Part No 83491 90014 Printed in USA August 2004 Agilent Technologies Digital Signal Analysis 1400 F ountaingrove Parkway Santa Rosa CA 95403 USA Notice The information contained in this document is subject to change without notice Com panies names and data used in examples herein are ficti tious unless otherwise noted Agilent Technologies makes no warranty of any kind with regard to this material includ ing but not limited to the implied warranties of mer chantability and fitness for a particular purpose Agilent Technologies shall not be lia blefor errors contained herein or for incidental or conse quential damages in connec tion with the furnishing performance or use of this material Restricted Rights Legend Use duplication or disclo sure by the U S Government is subject to restrictions as set forth in subparagraph c 1 ii of the Rights in Technical Data and Computer Software clause at DFARS 252 227 7013 for DOD agencies and sub paragraphs c 1 and c 2 of the Commercial Computer Software Restricted Rights clause at FAR 52 227 19 for other agenci
18. CT G B 155 Mis 12488 ai s 7 Trigger 622Mb s 9 953Ghis On Data Oo Qo Trigger Loss Trigger loss light L Auxiliary Outputs C Optical Output 1310 1550 nm 1 5dB 9 125um 10 mW Max Q Figure 2 1 Agilent 83491 2 3 4A front panels SELECT key UNLOCKED indicator 83491 2 3A Trigger Loss indicator 83494A Auxiliary outputs Operation Front Panel Features Pressing this key changes the data rate selection The recovered and retimed clock trigger is sent to the mainframe The Trigger On Data selection is a bypass mode where the data stream directly triggers the mainframe Refer to Block Diagrams on page 2 6 to view a schematic of the normal and bypass paths Green and red data rate lights The data rate indicator lights on the Agilent 83491 2 3A and Agilent 83494A Option 106 change color between red and green to show which data rate is selected A red light does not indicate a problem A red light shows that the adjacent red data rate label is selected A green light shows that the adjacent green data rate label is selected Repeatedly pressing the SELECT key cycles through the selections in one color before switching to the opposite color On Agilent 83491A modules for example the first selec tion cycle shows 155 M b s selected The second selection cycle shows 1062 M b s selected Agilent 83494A modules use only the green data rate indicator light to show which data rate is selected Rep
19. D Before connecting any coaxial cable to the connectors momentarily short the center and outer conductors of the cable together Avoid touching the front panel input connectors without first touching the frame of the instrument Be sure that the instrument is properly earth grounded to prevent buildup of static charge 83492 3 4A Modules To prevent damage to the module the maximum signal input level is lt 3 dBm Turn on the mainframe and connect a modulated signal to the 83491 2 3 4A module s Input connector If you are using an 83480A DCA press the Trigger key and then the Source softkey Then select trigger 2 the 83491 2 3 4A module for the trigger source On the 83491 2 3 4A module repeatedly press the SELECT key until a front panel light indicates the data rate of the signal Avoid selecting a data rate that is a multiple of the input signal For example don t select a 622 Mb s data rate if the signal is really at 155 Mb s Confirm that the Unlocked light is off If using the 83494A confirm that the Trigger Loss light is off If the UNLOCKED light is on or TRIGGER LOSS light on the 834944 clock recovery cannot be established on the signal Observethe Clock and Data outputs on DCA Waveforms should be present The instrument is now ready for you to begin making measurements If you cannot get the clock recovery module to lock on the signal make sure that you have selected the correct data rate and that the mainframe tri
20. ILENT 834944 1 5 dB Panel 94b Figure 2 4 83494A Block Diagram 2 7 Operation Block Diagrams INPUT i 50 MHz Jj 2500 MHz 10664 MHz modulation 10664 Mb s Resonator Divide by 4 E Output See Note AUX CLOCK i i Rate Ta i AUX Swi rigger gt Trigger DATA Trigger Squelch gt Output to i 2488 2666 Mainframe Mb j i 2 7 Gb s Clean Up Front Clock Phase Tri i Panel Data Locked rigger i Receiver Select Loss i Microcontroller gt Mainframe 1 Control Note Rear AGILENT 83494A Option 106 1 5 dB Panel 94bd 106 Figure 2 5 83494A Option 106 Block Diagram 2 8 Operation To Display a Signal To Display a Signal 1 Install the module as described in Installation on page 1 5 Be sure to connect all of the cables as described in the procedure 2 Repeatedly press the SELECT key on the clock recovery module until the front panel light indicates the proper data rate of the signal Green and red data rate lights The data rate indicator lights on the 83491 2 3A and 83494A Option 106 change color between red and green to show which data rate is selected A red light does not indicate a problem A red light shows that the adjacent red data rate label is selected A green light shows that the adjacent green data rate label is selected Repeatedly pressing the SELECT key cycles through the selections in one color before switching to the opposite color On 83491A modules for examp
21. crews at the bottom of the plug in module are finger tight Install the plug in in a different slot in the mainframe 3 5 n n Reference Communications failure exists atslot_ Service is required Communications failure exists at slot Service is required An illegal hardware state is detected at the mainframe to plug in module interface of the specified slot If the slot is empty there is a mainframe hardware problem Refer to the Agilent 83480A Agilent 54750A Service Guide If a plug in is installed in the slot there is a plug in module hardware problem Return the plug in module to a qualified service department ID error occurred in plug in Service is required The information read from the memory of the plug in module does not match the hardware in the plug in module This can be caused by a communication problem between the mainframe and the plug in module Make sure there is a good connection between the mainframe and the plug in Remove and re install the plug in module Verify the plug in module is firmly seated in the mainframe slot Verify the knurled screws at the bottom of the plug in module are finger tight The standard Agilent 54750A mainframe does not accept the Agilent 83491 2 3 4A module To use the module a firmware upgrade must first be installed Order the Agilent 83480K communications firmware kit and install according to the instructions The Agilent 83480A Agilent 54750A mainframes
22. cription Agilent Part Number Adapter in Diamond HM S 10 81000AI FC PC 81000Fl rE D4 81000GI TEH SC 81000KI Eh DIN 810005 r E3 ST 81000VI E Biconic 81000W Dust Covers FC connector 1005 0594 Diamond HM S 10 connector 1005 0593 DIN connector 1005 0595 ST connector 1005 0596 SC connector 1005 0597 a The FC PC adapter is the standard adapter supplied with the instrument 3 2 Oagacduwd du a Quuu m Reference In Case of Difficulty In Case of Difficulty This section provides a list of suggestions for you to follow if the plug in mod ule fails to operate A list of messages that may be displayed is also included in this chapter Before calling Agilent Technologies or returning the unit for ser vice a few minutes spent performing some simple checks may save waiting for your instrument to be repaired If the mainframe does not operate Is the line fuse good Does the line socket have power Is the unit plugged in to the proper ac power source Is the mainframe turned on Is the rear panel line switch set to on Will the mainframe power up without the plug in module installed If the plug in does not operate Is the plug in module firmly seated in the mainframe slot Are the knurled screws at the bottom of the plug in module finger tight Is the clock recovery module set to the modulation rate of the input signal If other equipment cables and connectors are being used with the plug in
23. disconnecting fiber optic cables Failure to do so may result in permanent injury to your eyes Cleaning Connectors The procedures in this section provide the proper steps for cleaning fiber optic cables and Agilent Technologies universal adapters The initial cleaning using the alcohol as a solvent gently removes any grit and oil If a caked on layer of material is still present this can happen if the beryllium copper sides of the ferrule retainer get scraped and deposited on the end of the fiber during insertion of the cable a second cleaning should be performed It is not uncommon for a cable or connector to require more than one cleaning Agilent Technologies strongly recommends that index matching compounds not be applied to their instruments and accessories Some compounds such as gels may be difficult to remove and can contain damaging particulates If you think the use of such compounds is necessary refer to the compound manufacturer for information on application and cleaning procedures Table 3 2 Cleaning Accessories Item Agilent Part Number Any commercially available denatured alcohol Cotton swabs 8520 0023 Small foam swabs 9300 1223 Compressed dust remover non residue 8500 5262 3 16 CAUTION Reference Cleaning Connections for Accurate Measurements Table 3 3 Dust Caps Provided with Lightw ave Instruments Item AgilentPart Number Laser shutter cap 08145 64521 FC PC dust cap 08154
24. dustrial Scientific and Medical Group 1 Class A product Contents Getting Started Introduction 1 2 General Safety Considerations 1 4 Installation 1 5 Returning the Instrument for Service 1 12 Operation Introduction 2 2 Front Panel Features 2 3 Block Diagrams 2 6 To Display a Signal 2 9 To Compensate for Module Insertion Loss 2 10 Using Probes with an 83491A 2 11 Reference Front Panel Optical Adapters 3 2 In Case of Difficulty 3 3 Error Messages 3 5 Electrostatic Discharge Information 3 7 Cleaning Connections for Accurate Measurements 3 9 Specifications and Regulatory Information 83491A Specifications 4 3 83492A Specifications 4 4 83493A Specifications 4 6 83494A Specifications 4 8 83491 2 3 4A Operating Specifications 4 10 Regulatory Information 4 11 Contents 1 Introduction 1 2 General Safety Considerations 1 4 Installation 1 5 Step 1 Inspect the shipment 1 5 Step 2 Install the module 1 7 Step 3 Connect the front panel cables 1 8 Step 4 Connect a modulated signal 1 10 Returning the Instrument for Service 1 12 Contacting Agilent Technologies 1 12 Getting Started WARNING Online Help Getting Started Introduction Introduction Agilent 83491 2 3 4A clock recovery modules are designed to operate in 86100 series infiniium Digital Communications Analyzers DCA and 83480A DCAs These modules recover clock and data information at standard telecom and datacom rates Th
25. e shipment for completeness and have checked the instrument mechanically and electrically Locate the shipping list Verify that you received all the accessories on this list and all the options that you ordered Table 1 2 on page 1 6 shows the external front panel cables that are supplied for each module Make sure that the serial number listed on the module s rear panel label match es the serial number listed on the shipping document If your shipment is damaged or incomplete save the packing materials and notify both the shipping carrier and the nearest Agilent Technologies service office Agilent Technologies will arrange for repair or replacement of damaged or incomplete shipments without waiting for a settlement from the transporta tion company Notify the Agilent Technologies customer engineer of any prob lems 1 5 Getting Started Installation Table 1 2 Supplied External Front Panel Cables Supplied Cable 83491A Agilent Part Number RF cable SM A SM A 9 75 cm 83491 20001 RF cable SM A SM A 15 2 cm 83491 20002 83492A Fiber optic cable semi rigid multimode 14 cm 83492 20001 Fiber optic cable semi rigid multimode 18 5 cm 83492 20002 83493A Fiber optic cable semi rigid single mode 14 cm 83493 20001 83494A Fiber optic cable semi rigid single mode 14 cm 83493 20001 a Refer to Step 3 Connect the front panel cables on
26. e probe 10 1 5000 20 1 1kQ has an input capacitance of 0 25 pf Agilent 1163A 1 GHz resistive divider probe This passive 500 probe has an input capacitance of 1 5 pf If you are using an 83480A DCA use the procedures in this section to gener ate vertical scale factors These factors are applied to the calibration of the reference receiver module s electrical channel When selecting a probe keep in mind that the input impedance of the 83491A is 500 If the probe being calibrated has an attenuation factor that allows the instru ment to adjust the gain to produce even steps in the vertical scale factors the instrument will do so Typically probes have standard attenuation factors such as divide by 10 divide by 20 or divide by 100 Because the following proce dures include compensation for insertion loss of the clock recovery module do not perform the procedure To Compensate for Module Insertion Loss on page 2 10 To compensate for a passive probe 1 Connect the probe to the Input connector on the 83491A clock recovery module 2 Attach the probe tip to the CAL hook that is located near the floppy disk drive 3 Pressthe reference receiver module s front panel channel SETUP key 2 11 Operation Using Probes with an 83491A Press Calibrate and then Calibrate probe To compensate an 54701A active probe Connect the 83491A output to the electrical measurement channel input Connect the probeto the Input connector on the
27. e resulting trigger signal is made available to the DCA mainframe via a connector located on the module s rear panel An external front panel cable passes the data signal with some insertion loss to the receiver module Table 1 1 M odule Features Agilent Module Input Connector Selectable Rates M b s 83491A 50Q electrical 155 622 1060 1250 2120 2488 2500 83492A Multimode fiber 62 5 125 um 155 622 1060 1250 2120 2488 2500 83493A Single mode fiber 9 125 pum 155 622 1250 2488 2500 83494A Single mode fiber 9 125 um 155 622 2488 9953 83494A Option 106 Single mode fiber 9 125 um 155 622 2488 2666 10664 83494A Option 107 Single mode fiber 9 125 um 155 622 2488 2666 10709 Light energy can radiate from the front panel OUTPUT connectors on 83492A 83493A and 83494A modules The light emitted from these connectors is the slightly attenuated light that is input to the front panel INPUT connector On 86100 series infiniium DCAs after installing the module as shown in this chapter you ll find all user documentation except programming is located in the instrument s Help system To access the Help system complete the instal lation steps turn on the 86100C and click Contents on the Help menu 1 2 83494A Auxiliary Clock Output CAUTION CAUTION Getting Started Introduction The 83494A module s front panel auxiliary clock output provides the recov ered clock signal ref
28. eatedly pressing the SELECT key cycles through the available data rates as well as the Trigger On Data bypass mode This light shows when clock recovery cannot be established on the signal If a clock rate is selected the trigger output to the mainframe is disabled to pre vent free run triggering However in bypass mode Trigger On Data selected triggering is not disabled When the UNLOCKED light is on you can establish a trigger on the data input to the reference receiver This light shows when clock recovery cannot be established on the signal If a clock rate is selected the trigger output to the mainframe is disabled to pre vent free run triggering However in bypass mode Trigger On Data selected triggering is not disabled When the Trigger Loss light is on you can establish a trigger on the data input to the reference receiver DATA connector This connector provides a fully regenerated version of the input signal It is intended for monitoring purposes only and not for rigorous eye mask compliance testing The frequency response does not conform to the requirements for eye mask testing as described in ITU T G 957 and Bellcore GR 253 CORE On Agilent 83492A and 83493A modules this port is ampli tude stabilized for input signals greater than approximately 23 dBm On Agilent 83494A modules this port is amplitude stabilized for input signals greater than approximately 10 dBm 2 4 Input and Output connectors Rec
29. ecause you ll connect an F C PC fiber optic cable in this procedure confirm that the receiver module s optical input connector has an F C PC adapter Fiber optic adapters can be removed by hand turning them in the counter clockwise direction Refer to Front Panel Optical Adapters on page 3 2 for a description of available adapters If you changed the adapter in step one you can connect the original adapter to the 83493 4A module s front panel Input connector Use the FC PC semi rigid fiber optic cable supplied with the 83493 4 module 83493 20001 to connect the Optical Output connector on the 83493 4A to the input on the receiver module Perform the following steps if you are installing an 83492A module 1 8 750 nmto 860 nm N Getting Started Installation On 83492A modules the front panel fiber optic connectors reverse input and output roles depending on the wavelength of the signal This is shown in Figure 1 4 Signals in the 750 nm to 860 nm wavelength range are input to the left connector and output from the right connector Signals in the 1000 nm to 1600 nm wavelength range are input to the right connector and output from the left connector Because you ll connect an F C PC fiber optic cable in this procedure confirm that the receiver module s optical input connector has an F C PC adapter Fiber optic adapters can be removed by hand turning them in the counter clockwise direction Refer to Front Panel Optical Ada
30. ee Figure 3 3 Reference Cleaning Connections for Accurate Measurements Figure 3 3 Universal adapters The HMS 10 encases the fiber within a soft nickel silver Cu Ni Zn center which is surrounded by a tough tungsten carbide casing as shown in Figure 3 4 Staking Groove Fixing oper Secondary Staking Active Centering Tungsten Carbide Hard Case Pd Nickel Silver CuNifZn Soft center 126 um Fiber Centered to about O02 microns Figure 3 4 Cross section of the Diamond HMS 10 connector The nickel silver allows an active centering process that permits the glass fiber to be moved to the desired position This process first stakes the soft nickel silver to fix the fiber in a near center location then uses a post active staking to shift the fiber into the desired position within 0 2 um This process plus the keyed axis allows very precise core to core alignments This connector is found on most Agilent Technologies lightwave instruments 3 11 Reference Cleaning Connections for Accurate Measurements The soft core while allowing precise centering is also the chief liability of the connector The soft material is easily damaged Care must be taken to mini mize excessive scratching and wear While minor wear is not a problem if the glass face is not affected scratches or grit can cause the glass fiber to move out of alignment Also if unkeyed connectors are used
31. er to Auxiliary outputs on page 2 4 To recover the clock at data rates greater than 2 5 Gb s the DCA mainframe must have one of the following trigger options installed 86100C Option 001 Enhanced Trigger 86100A B Option 001 Divided Trigger 83480A Option 100 Divided Trigger Fiber optic connectors are easily damaged when connected to dirty or damaged cables and accessories The 83492A 83493A and 83494A front panel input connectors are no exception When you use improper cleaning and handling techniques you risk expensive instrument repairs damaged cables and compromised measurements Before you connect any fiber optic cable to an 83492A 83493A or 83494A module refer to Cleaning Connections for Accurate Measurements on page 3 9 The circuits on electrical inputs and outputs can be damaged by electrostatic discharge ESD Therefore avoid applying static discharges to any front or rear panel electrical connector Before connecting any coaxial cable to a front panel connector momentarily short the center and outer conductors of the cable together Avoid touching the front panel connectors without first touching the frame of the instrument Be sure that the instrument is properly earth grounded to prevent buildup of static charge Refer to Electrostatic Discharge Information on page 3 7 3G Agilent BEiRiconmu wer onsa muzen C 9 oS Figure 1
32. es Safety Symbols CAUTION CE The caution sign denotes a hazard It calls attention to a procedure which if not cor rectly performed or adhered to could result in damage to or destruction of the product Do not proceed beyond a cau tion sign until the indicated conditions are fully under stood and met WARNING The warning sign denotes a hazard It calls attention to a procedure which if not cor rectly performed or adhered to could result in injury or loss of life Do not proceed beyond a warning sign until the indicated conditions are fully understood and met ISM1 A The instruction man ual symbol The prod uct is marked with this warning symbol when it is necessary for the user to refer to the instructions in the manual A The laser radiation symbol This warning symbol is marked on products which have a laser output The AC symbol is used to indicate the required nature of the line module input power Av The ON symbols are used to mark the posi tions of the instrument power line switch O The OFF symbols are used to mark the positions of the instru ment power line Switch The CE mark is a reg istered trademark of the European Commu nity The CSA mark is a reg istered trademark of the Canadian Stan dards Association The C Tick mark is a registered trademark of the Australian Spec trum Management Agency This text denotes the instrument is an In
33. everal times in this ma terial will protect the instrument and prevent it from moving in the carton 4 Seal the carton with strong nylon adhesive tape 5 Markthe carton FRAGILE HANDLE WITH CARE 6 Retain copies of all shipping papers 1 14 Introduction 2 2 Front Panel Features 2 3 Block Diagrams 2 6 To Display a Signal 2 9 To Compensate for Module Insertion Loss 2 10 Using Probes with an 83491A 2 11 Operation Operation Introduction Introduction If you use an 83491 2 3 4A module in an 86100 series infiniium DCA informa tion on using the clock recovery modules along with specifications is included in the instrument s help system To access the built in information system referred to as Help simply click Contents on the Help menu GPIB programming commands for the modules are documented in the 86100 series infiniium DCA programmer s guide If you use an 83491 2 3 4A module in an 83480A DCA you ll notice that unlike most modules designed to be used with the 83480A the clock recovery mod ules do not include Channel keys or menus Also there are no GPIB program ming commands for these modules when used in an 83480A mainframe Multimode module and single mode reference receivers Agilent Technologies does not recommend using the Agilent 83492A multi mode module with single mode reference receivers such as the Agilent 83481A 83482A or 83485A B modules Connecting multimode to sin gle mode fibers cause
34. gger level is adjusted appropriately Signals displayed using a data trigger are less reliable than using a recovered clock Signals triggered on data can also vary depending upon the trigger level 1 10 Getting Started Installation Green and red data rate lights The data rate indicator lights on the Agilent 83491 2 3A and Agilent 83494A Option 106 change color between red and green to show which data rate is selected A red light does not indicate a problem A red light shows that the adjacent red data rate label is selected A green light shows that the adjacent green data rate label is selected Repeatedly pressing the SELECT key cycles through the selections in one color before switching to the opposite color On Agilent 83491A modules for example the first selec tion cycle shows 155 M b s selected The second selection cycle shows 1062 M b s selected Agilent 83494A modules use only the green data rate indicator light to show which data rate is selected Repeatedly pressing the SELECT key cycles through the available data rates as well as the Trigger On Data bypass mode Triggering Red light shows Green light shows Select unlocked red data rate green data rate key light is selected is selected 83491A ELECTRICAL 155 Mb s 2488 Mb s 1062 Mb s Li 1250 Mb s Hl 622 Mb s 2125 Mb s O 2500 Mb s O Clock hos Auxiliary Outputs E Figure 1 5 Front panel lights 1 11 Call Center
35. housands of dollars not to mention lost time This expense can be avoided by observing the simple precautions presented in this book This book also contains a brief list of tips for caring for electrical connec tors Choosing the Right Connector A critical but often overlooked factor in making a good lightwave measure ment is the selection of the fiber optic connector The differences in connec tor types are mainly in the mechanical assembly that holds the ferrule in position against another identical ferrule Connectors also vary in the polish curve and concentricity of the core within the cladding Mating one style of cable to another requires an adapter Agilent Technologies offers adapters for most instruments to allow testing with many different cables Figure 3 2 on page 3 10 shows the basic components of a typical connectors The system tolerance for reflection and insertion loss must be known when selecting a connector from the wide variety of currently available connectors Some items to consider when selecting a connector are How much insertion loss can be allowed Will the connector need to make multiple connections Some connectors are better than others and some are very poor for making repeated connections What is the reflection tolerance Can the system take reflection degradation Is an instrument grade connector with a precision core alignment required Is repeatability tolerance for reflection and loss importan
36. l To prevent electrical shock do not remove covers This product is designed for use in Installation Category II and Pollution Degree 2 per IEC 1010 and 664 respectively Electrostatic discharge ESD on or near input connectors can damage circuits inside the instrument Repair of damage due to misuse is not covered under warranty Before connecting any cable to the electrical input momentarily short the center and outer conductors of the cable together Personnel should be properly grounded and should touch the frame of the instrument before touching any connector 1 4 NOTE Getting Started Installation Installation Although some of the figures in the following procedure show an 83480A DCA mainframe the procedures equally apply to installing the module into an 86100 series DCA mainframe If an 83491 2 3 4A module is installed in an 83480A DCA the DCAs firmware revision must be A 06 25 or later If the module is installed in an Agilent 54750A digitizing oscilloscope you must first install the Agilent 83480K communications firmware upgrade kit To check the Agilent 83480A s firmware revision code press the Utility key and then the System config softkey The firmware revision number is listed under the F rame section of the display Step 1 Inspect the shipment Inspect the shipping container and instrument for damage Keep the shipping container and cushioning material until you have inspected the contents of th
37. le the first selection cycle shows 155 M b s selected The second selection cycle shows 1062 M b s selected Agilent 83494A modules use only the green data rate indicator light to show which data rate is selected Repeatedly pressing the SELECT key cycles through the available data rates as well as the Trigger On Data bypass mode e Ifthe UNLOCKED light is on or TRIGGER LOSS light on the 83494A clock recov ery cannot be established on the signal Avoid selecting a data rate that is a multiple of the input signal F or example don t select a 622 Mb s data rate if the signal is really at 155 Mb s f you cannot get the clock recovery module to lock on the signal make sure that you have selected the correct data rate and that the mainframe trigger level is adjusted appropriately Signals displayed using a data trigger are less reliable than using a recovered clock Signals triggered on data can also vary depending upon the trigger level 2 9 Operation To Compensate for M odule Insertion Loss To Compensate for Module Insertion Loss If you are using an 86100 series infiniium DCA refer to the instrument s help system for information on compensating for module insertion loss Use the fol lowing steps on an 83480A DCA to allow you to enter an offset to compensate for the insertion loss of the clock recovery module This provides accurate amplitude measurements at the input to the clock recovery module Discon
38. lent Technologies For technical assistance you can contact your local Agilent Call Center In the Americas call 1 800 829 4444 In other regions visit http www agilent com find assist Before returning an instrument for service you must first call the Agilent Technologies Instrument Support Center In all regions call 800 829 4444 1 12 CAUTION CAUTION Getting Started Returning the Instrument for Service Preparing the module for shipping 1 Write a complete description of the failure and attach it to the instrument Include any specific performance details related to the problem The following information should be returned with the instrument Type of service required Date instrument was returned for repair Description of the problem Whether problem is constant or intermittent Whether instrument is temperature sensitive Whether instrument is vibration sensitive nstrument settings required to reproduce the problem Performance data Company name and return address Name and phone number of technical contact person Model number of returned instrument Full serial number of returned instrument List of any accessories returned with instrument Cover all front or rear panel connectors that were originally covered when you first received the instrument Cover electrical connectors to protect sensitive components from electrostatic damage Cover optical connectorsto protec
39. mation on ordering static safe accessories These techniques for a static safe work station should not be used when working on circuitry with a voltage potential greater than 500 volts Reducing ESD Damage The following suggestions may help reduce ESD damage that occurs during testing and servicing operations Personnel should be grounded with a resistor isolated wrist strap before re moving any assembly from the unit Be sure all instruments are properly earth grounded to prevent a buildup of static charge Table 3 1 Static Safe Accessories Agilent Part N mb r Description 9300 0797 Set includes 3M static control mat 0 6 m x 1 2 m 2 ftx 4 ft and 4 6 cm 15 ft ground wire The wrist strap and wrist strap cord are not included They must be ordered separately 9300 0980 W rist strap cord 1 5 m 5 ft 9300 1383 Wrist strap color black stainless steel without cord has four adjustable links and a 7 mm post type connection 9300 1169 ESD heel strap reusable 6 to 12 months 3 8 Reference Cleaning Connections for Accurate Measurements Cleaning Connections for Accurate Measurements Today advances in measurement capabilities make connectors and connec tion techniques more important than ever Damage to the connectors on cali bration and verification devices test ports cables and other devices can degrade measurement accuracy and damage instruments Replacing a dam aged connector can cost t
40. n swabs 3 16 customer assistance 1 4 D damaged shipment 1 5 DATA Auxiliary Output connector 2 4 2 5 data rate indicator lights 1 11 data rates 1 2 multiple of 1 10 2 9 declaration of conformity 1 4 dust caps 3 17 electrostatic discharge 1 3 3 7 EMC requirements 4 11 ESD reducing damage caused by ESD 3 8 static safe work station 3 8 extender cables 1 7 F fiber adapters 3 2 care of 1 3 multimode 1 2 reflections 2 5 single mode 1 2 single mode connections 2 5 fiber optics cleaning connections 3 9 connectors covering 1 13 firmware upgrade kit 1 5 version required 1 5 foam swabs 3 16 front panel 2 3 adapters 3 2 features 2 3 G GPIB programming 2 2 green light 1 11 H Help 2 2 Index 1 Index l input connector 3 9 Input connector 1 3 1 9 input connector 1 2 input signal maximum safe 1 10 insertion loss 2 2 2 5 compensation 2 10 instrument returning for service 1 12 ITU T G 957 2 4 M mainframe troubleshooting 3 3 maximum input level 1 10 module installing 1 7 noise declaration 4 11 0 online help 2 2 Output connector 2 5 P packaging for shipment 1 13 plug in module serial number 1 5 programming 2 2 R red light 1 11 regulatory information 4 2 responsivity testing 1 7 returning for service 1 12 S safety information 1 4 1 7 SELECT key 1 10 2 4 serial number 1 5 service 1 12 returning for 1 12 shippi
41. nect the cable from the clock recovery module s Input connector Measure the signal using a power meter You can use either the 83480A s built in power meter or an external power meter 3 Reconnect the cable to the clock recovery module Disconnect the cable from the reference receiver module s input connector Measure the signal using a power meter You can use either the 83480A 5 built in power meter or an external power meter Subtract the two measurements to determine the insertion loss of the module Insertion 0552 zac ree xi e es Obs FR RR e ue Se LRL emt On the reference recei ver module press the front panel channel SETUP key Press External scale and set the Atten units to decibel Press Attenuation and enter the value calculated in Step 6 Operation Using Probes with an 83491A Using Probes with an 83491A You can use external passive and active probes with the 83491A electrical clock recovery module If you are using an 86100 series infiniium DCA refer to the infiniium DCA s help system the procedures in this section are for use on an 83480A DCA The following probes are available for use with 83491A clock recovery mod ules Agilent N 1020A TDR probe This passive probe 1 1 500 provides a fixture for positioning and holding the probe tip on the device being tested Agilent 54701A 2 5 GHz active probe This is a 100kQ 10 1 probe Agilent 54006A 6 GHz handheld low impedance probe This passiv
42. nformation 83494A Specifications Table 4 4 83494A Specifications 2 of 2 Output jitter all rates 0 02 Ulins 155 52 M b s 0 01 Ul typical 622 08 M b s 0 01 UI typical 2488 32 M b s 0 01 UI typical M aximum continuous optical power before damage characteristic 10 mW peak DATA and CLOCK output amplitude all rates characteristic 0 5Vp p DATA and CLOCK output electrical return loss 50 MHz through 2500 M Hz characteristic gt 10 dB 2 5 GHz through 10 GHz characteristic gt 8dB Tested with FC PC adapter Optical output terminated without gt 33 dB return loss Source extinction ratio 2 8 2 dB when measured per TIA EIA OFSTP 4A Operating power level applies over temperature range 25 C X 5 Better than 10 BER when tested with PRBS 22 1 pattern Measured on an oscilloscope eye diagram with PRBS 22 1 test pattern D Oo o0 ccu 4 9 Specifications and Regulatory Information 83491 2 3 4A Operating Specifications 83491 2 3 4A Operating Specifications Table 4 5 Operating Specifications Use Indoor Temperature Operating 0 C to 455 C Non operating 40 C to 70 C Altitude Operating 4600 m 15 000 ft Non operating 15 300 m 50 000 ft Humidity Operating up to 90 relative humidity at lt 35 C Non operating up to 90 relative humidity at lt 35 C Net weight approximately 1 2 kg 2 6 Ib Shipping weight approximately 2 1 kg 4 6 Ib Dimensions H xW xD 131 66 mm x 80 14 mm x 266
43. ng procedure 1 13 single mode fiber 2 5 specifications 4 2 Agilent 83491A 4 3 Agilent 83492A 4 4 Agilent 83493A 4 6 Agilent 83494A 4 8 defined 4 2 operating 4 10 temperature range 4 2 swabs 3 16 T technical assistance 1 4 testing responsivity 1 7 trigger bypass mode 2 4 Trigger Loss light 1 10 2 9 Trigger On Data light 2 4 troubleshooting 3 3 U Unlocked light 1 10 2 4 2 9 Index 2
44. oothness the connector can still provide a good low level return loss con nection If you test your cables and accessories for insertion loss and return loss upon receipt and retain the measured data for comparison you will be able to tell in the future if any degradation has occurred Typical values are less than 0 5 dB of loss and sometimes as little as 0 1 dB of loss with high performance con nectors Return loss is a measure of reflection the less reflection the better the larger the return loss the smaller the reflection The best physically contacting connectors have return losses better than 50 dB although 30 to 40 dB is more common 3 15 WARNING CAUTION Reference Cleaning Connections for Accurate Measurements Visual inspection of fiber ends Visual inspection of fiber ends can be helpful Contamination or imperfections on the cable end face can be detected as well as cracks or chips in the fiber itself Use a microscope 100X to 200X magnification to inspect the entire end face for contamination raised metal or dents in the metal as well as any other imperfections Inspect the fiber for cracks and chips Visible imperfec tions not touching the fiber core may not affect performance unless the imperfections keep the fibers from contacting Always remove both ends of fiber optic cables from any instrument system or device before visually inspecting the fiber ends Disable all optical sources before
45. overed Clock Operation Front Panel Features CLOCK connector This connector provides the recovered clock signal You can use this signal to measure jitter transfer because this output can track and fol low input data with very fast jitter it has a wide bandwidth jitter transfer func tion when compared to the recovered clock signal which is routed through a rear panel connector to the mainframe for triggering Note that the CLOCK Aux iliary Output remains synchronized to input signals several dB below the onset of errors at the DATA Auxiliary Output The input connectors pass the digitally modulated signal to the receiver mod ule The input signal slightly attenuated and available at the OUTPUT connec tor is connected to the input of the receiver module The connectors on optical modules include adapters which can easily be changed to match the type of connectors that are used on your fiber optic cables Refer to Front Panel Optical Adapters on page 3 2 for a description of the available adapt ers Multimode and single mode connections Agilent 83492A modules use multimode fiber Connecting the output to the Optical INPUT connector on Agilent 83481 2 5 single mode modules results in large reflections and insertion loss Agilent 83493A and 83494A modules use 9 125 um single mode fiber Connecting mul timode fiber to the Optical Input connector results in large reflections and insertion loss The recovered clock signal i
46. pters on page 3 2 for a description of available adapters If you changed the adapter in step one you can connect the original adapter to the 83493 4A module s front panel input connector See Figure 1 3 to identify the input connector based on input wavelength Connect the supplied adapter cable as shown in Figure 1 3 Usethe short cable 83492 20002 when operating at 750 nm to 860 nm wavelengths Use the long cable 83492 20001 when operating at 1000 nm to 1600 nm wavelengths Input wavelength range Input wavelength range 83492A 2500 Mbs 83487A MULTIMODE CLOCK RECOVERY MODULE 1063 120 Mbis SELECT 750 nm to 860 nm 1000 nm to 1600 nm 280 83486A OPTIC AL ELECTRIC AL MODULE SETUP SETUP SETUP SETUP OPTICAL CHANNEL ELECTRICAL CHANNEL OPTICAL CHANNEL FLECTRICAL CHANNEL 1310 1550 nm 62612m 10 Mw Max 1000 nm to 1600 nm inoutcon cdr Figure 1 4 Input and output connections versus wavelength 1 9 WARNING CAUTION CAUTION Getting Started Installation Step 4 Connect a modulated signal Light energy can radiate from the front panel OUTPUT connectors on 83492A 83493A and 83494A modules The light emitted from these connectors is the slightly attenuated light that is input to the front panel INPUT connector 83491A Modules To prevent damageto the module the maximum safe signal input level is lt 5V The input circuits can also be damaged by electrostatic discharge ES
47. riggering External Output Clock recovery rates NRZ coding 155 52 Mb s 622 08 M b s 1062 50 M b s 1250 Mb s 2125 00 Mb s 2488 32 Mb s 2500 00 M b s Data triggering characteristic Operating input power level 750 nm to 860 nm Triggering operation all rates 10 BER all rates 1000 nm to 1600 nm Triggering operation all rates 10 BER all rates f Output jitter all rates 9 750 nm to 860 nm and 1000 nm to 1600 nm 62 5 125 multimode amp 5 0 dB amp 5 0 dB 28 dB 50 to 70 kHz 4to5MHz 30 196 30 176 30 196 30 196 30 196 30 176 30 196 50 M b s to 2500 M b s 10 dBm to 3 dBm 10 dBm to 3 dBm 13 dBm to 3 dBm 13 dBm to 3 dBm 0 0125 UI 4 4 Specifications and Regulatory Information 83492A Specifications Table 4 2 83492A Specifications 2 of 2 M aximum continuous optical power before damage characteristic 10 mW peak DATA and CLOCK output amplitude all rates characteristic 0 5Vp p DATA and CLOCK electrical return loss 50 MHz through 2000 M Hz characteristic gt 10dB 2000 M Hz through 2500 M Hz characteristic gt 6dB oov Qe 0cdo0o0 Minimum loss in 850 nm window Single mode backreflection tested with FC PC adapter and single mode fiber Optical output terminated with gt 33 dB return loss Return loss with fully filled 62 5 Lum core multimode fiber may be slightly lower Source extinction ratio 2 8 2 dB when measured per TIA EIA OFSTP 4A
48. s large reflections and insertion loss because of the reduction of the optical fiber s core from 62 5 um to 9 um Single mode module and multimode reference receivers It is acceptable to use an Agilent 83493A or an 83494A single mode module with a multimode reference receiver such as the Agilent 83486A module This is true provided that single mode fiber is connected to the Agilent 83493A or 83494A module s front panel INPUT connector 2 2 SELECT key Triggering unlocked light Data input and output Operation Front Panel Features Front Panel Features Selection to directly trigger on data 155 Mb s 7 2488 Mb s 1062 mers O 1250 ntis O Trigger 622 Mb s o OnData 2125 Mb s 2500 Mb s Un ga k Auxiliary ugue ed Electrical 83493A 2500 Mb s SINGLE MODE CLOCK RECOVERY MODULE SELECT B o 185 Mi s 2488 Mb s C Trigger 622 Mb s j 1250 Mb s On Data o 2500 Mbis a Auxiliary Outputs J Optical Input i 1 5 dB 1000 1600 nm 9 125um 10 mW Max Red light shows red data rate selected Green light shows green data rate selected 83492A 2500 Mb s MULTIMODE CLOCK RECOVERY MpDULE SELECT ME ro O fasone O p 4 OnData 2128 Mbs L 2500 mbs O Unlocked Clock m Auxiliary outputs UU Auxiliary Outputs Optical 780 850 nm 1310 1550 nm 62 5 125 m 10 Mw Max Green light shows data rate 83494A 9 953 Gb s selected SINGLE MODE CLOCK RECOVERY ALAR SELE
49. s routed directly to the 86100 series or 83480A mainframes through the module s rear panel This output has a lower jitter modulation bandwidth than the front panel CLOCK Auxiliary Output Because of the reduced jitter modulation bandwidth on the mainframe trigger signal a more complete view of the jitter on the waveform data is obtained 2 5 Operation Block Diagrams Block Diagrams god Clock Data i 2500 MHz i Receiver Trigger i Output to Output TRIGGER on i Mainframe 7dB DATA Path i i DATA CLOCK h i Mi Mainframe Front icrocontroller Control Panel i Rear Panel ota Figure 2 2 83491A Block Diagram INPUT 50 MHz 2500 MHz modulation id f X lt Clock Data i Receiver i s gt rigger I Output to Output TRIGGER on Mainframe See Note DATA Path i DATA Trigger CLOCK Select H i Front Microcontroller gt ME Panel Note AGILENT 83492A 5 dB Rear AGILENT 834934 2 dB Panel 93bd Figure 2 3 83492A and 83493A Block Diagram 2 6 Operation Block Diagrams INPUT i 50 MHz 2500 MHz 9953 MHz i modulation i 9953 Mb s Resonator Divide by 4 Output See Note AUX i CLOCK i l Rate Tri i AUX Swl rigger Trigger DATA Trigger Squelch gt gt Output to 2488 Mb s On Mainframe i 2 5 Gb s Eh Data Sw Front Clock Panel Data yea Trigger Receiver Select Loss i Microcontroller gt Mainframe Control i Note Rear AG
50. t Do your specifica 3 9 Reference Cleaning Connections for Accurate Measurements tions take repeatability uncertainty into account Will a connector degrade the return loss too much or will a fusion splice be re quired For example many DFB lasers cannot operate with reflections from connectors Often as much as 90 dB isolation is needed Connecting Body and Ferrule 2 5 mm Mechanical Retainer Fiber 125 um actual fiber s diameter is smaller than a human hair Alignment Key Figure 3 2 Basic components ofa connector Over the last few years the FC PC style connector has emerged as the most popular connector for fiber optic applications While not the highest perform ing connector it represents a good compromise between performance reli ability and cost If properly maintained and cleaned this connector can withstand many repeated connections However many instrument specifications require tighter tolerances than most connectors including the F C PC style can deliver These instruments cannot tolerate connectors with the large non concentricities of the fiber common with ceramic style ferrules When tighter alignment is required Agilent Technologies instruments typically use a connector such as the Diamond HMS 10 which has concentric tolerances within a few tenths of a micron Agi lent Technologies then uses a special universal adapter which allows other cable types to mate with this precision connector S
51. t removing loose particles or using improper cleaning tools When severe the damage of one connector end can be transferred to another good connector endface that comes in contact with the damaged one Periodic checks of fiber ends and replacing connecting cables after many connections is a wise practice The cure for these problems is disciplined connector care as described in the following list and in Cleaning Connectors on page 3 16 3 12 Reference Cleaning Connections for Accurate Measurements Use the following guidelines to achieve the best possible performance when making measurements on a fiber optic system Never use metal or sharp objects to clean a connector and never scrape the connector Avoid matching gel and oils t o Figure 3 5 Clean problem free fiber end and ferrule te de Figure 3 6 Dirty fiber end and ferrule from poor cleaning 3 13 Reference Cleaning Connections for Accurate Measurements A X hs E RSS Figure 3 7 Damage from improper cleaning While these often work well on first insertion they are great dirt magnets The oil or gel grabs and holds grit that is then ground into the end of the fiber Also some early gels were designed for use with the FC non contacting con nectors using small glass spheres When used with contacting connectors these glass balls can scratch and pit the fiber If an index matching gel or oil must be used apply it to a freshly cleaned
52. t them from damage dueto physical contact or dust Instrument damage can result from using packaging materials other than the original materials Never use styrene pellets as packaging material They do not adequately cushion the instrument or prevent it from shifting in the carton They may also cause instrument damage by generating static electricity Pack the instrument in the original shipping containers Original materials are available through any Agilent Technologies office Or use the following guidelines Wrapthe instrument in antistatic plastic to reducethe possibility of damage caused by electrostatic discharge Forinstruments weighing less than 54 kg 120 Ib use a double walled cor rugated cardboard carton of 159 kg 350 Ib test strength Thecarton must be large enough to allow approximately 7 cm 3 inches on 1 13 Getting Started Returning the Instrument for Service all sides of the instrument for packing material and strong enough to accom modate the weight of the instrument Surround the equipment with approximately 7 cm 3 inches of packing ma terial to protect the instrument and prevent it from moving in the carton If packing foam is not available the best alternative is S D 240 Air Cap from Sealed Air Corporation Commerce California 90001 Air Cap looks like a plastic sheet filled with air bubbles Use the pink antistatic Air Cap to reduce static electricity Wrapping the instrument s
53. tic Operating input power level Triggering operation all rates 10 BER all rates Insertion loss through path DC through 2500 M Hz Output jitter all rates M aximum continuous electrical power before damage characteristic DATA and CLOCK output amplitude all rates characteristic INPUT electrical return loss DC through 1250 M Hz characteristic 1250 M Hz through 2500 M Hz characteristic DATA and CLOCK electrical return loss 50 M Hz through 2000 M Hz characteristic 2000 M Hz through 2500 M Hz characteristic a Source extinction ratio 2 8 2 dB when measured per TIA EIA OFSTP 4A b Operating power level applies over temperature range 25 C 5 c Better than 10 BER when tested with PRBS 27 1 pattern d Measured on an oscilloscope eye diagram with PRBS 27 1 test pattern 50 to 70 kHz 4to5MHz 30 196 30 196 30 196 30 176 30 176 30 196 30 196 50 M b s to 2500 M b s 10 dBm to 3 dBm 10 dBm to 3 dBm 7d 0 0125 UI S 1W peak 0 5Vp p 2 20 dB 215dB 210 dB 2 6 dB 4 3 Specifications and Regulatory Information 83492A Specifications 83492A Specifications Table 4 2 83492A Specifications 1 of 2 Wavelength range characteristic Optical INPUT and OUTPUT fiber characteristic Optical insertion loss through path 750 nm to 860 nm 1000 nm to 1600 nm Optical return loss Clock Recovery Phase Locked Loop Bandwidth characteristic Internal Path T

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