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Agilent 83491/2/3A
Clock Recovery Modules
User’s Guide
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© Copyright 2000 material and workmanship for gies shall not be liable for any The OFF symbols ❍ Agilent Technologies a period of one year from date direct, indirect, special, inci- are used to mark the All Rights Reserved. Repro- of shipment. During the war- dental, or consequential dam- positions of the instru- duction, adaptation, or trans- ranty period, Agilent Technol- ages, whether based on ment power line lation without prior written ogies will, at its option, either contract, tort,
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General Safety Considerations General Safety Considerations This product has been designed and tested in accordance with IEC Publica- tion 61010-1, Safety Requirements for Electrical Equipment for Measurement, Control and Laboratory Use, and has been supplied in a safe condition. The instruction 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. WARNING Light energy can radiate from the f
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General Safety Considerations Technologies part number 2110-0449. For 220/240V operation, use an IEC 127 5×20 mm, 0.16 A, 250 V, Agilent Technologies part number 2110-0448. CAUTION Before switching on this instrument, make sure that the line voltage selector switch is set to the line voltage of the power supply and the correct fuse is installed. Assure the supply voltage is in the specified range. CAUTION This product is designed for use in Installation Category II and Pollution Degree 2
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Contents General Safety Considerations iii 1 Installation Installation 1-2 2Operation Agilent 83491/2/3A Modules—At a Glance 2-2 Front-Panel Features 2-4 Block Diagrams 2-7 To Display a Signal 2-8 To Compensate for Module Insertion Loss 2-9 Using Probes with an Agilent 83491A 2-10 3 Specifications and Regulatory Information Agilent 83491A Specifications 3-3 Agilent 83492A Specifications 3-4 Agilent 83493A Specifications 3-6 Agilent 83491/2/3A Operating Specifications 3-7 Declaration of Conformit
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1 To install the module 1-3 To connect cables to an Agilent 83492A 1-7 Installation
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Installation Installation Installation Agilent 83491/2/3A modules require that firmware revision A.06.25 or later be installed in the Agilent 83480A. If you wish to install the module 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 1 Press the Utility key and then the System config softkey. 2 The firmware revision number is listed under the Frame section of the dis
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Installation Installation To install the module 1 Verify that all system components ordered have arrived by comparing the shipping forms to the original purchase order. Inspect all shipping containers. The shipment includes: ❒ An Agilent 83491/2/3A Clock Recovery Module ❒ Fiber-optic adapter cable (Agilent 83492/3A module only) ❒ Two RF adapter cables (Agilent 83491A module only) ❒ Agilent 83491/2/3A User’s Guide (this book) If your shipment is damaged or incomplete, save the packing materials
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Installation Installation Figure 1-2. Position of modules in the mainframe 3 Clean all optical interfaces as described in “Cleaning Connections for Accurate Measurements” on page 4-10, before making measurements. 4 Perform the following steps if you’re installing an Agilent 83492/3A module: a Unscrew and remove the fiber-optic adapter that is located on the optical module’s front-panel optical input connector. b Connect the adapter that was removed in the previous step onto the Agilent 83492/
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Installation Installation Figure 1-3. The adapter cable CAUTION Agilent 83491A Modules: Maximum safe signal input level is ±5V. The input circuits can also be damaged by electrostatic discharge (ESD). 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
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Installation Installation Figure 1-4. Front-panel lights 9 Confirm that the Unlocked light is off. 10 Observe the Clock and Data outputs on an oscilloscope. Waveforms should be present. The instrument is now ready for you to begin making measurements. 1-6
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Installation Installation To connect cables to an Agilent 83492A On Agilent 83492A modules, the front-panel fiber-optic connectors reverse input and output roles depending on the wavelength of the signal. 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 wave- length range are input to the right connector and output from the left connec- tor. Figure 1-5. Input and output connections versus w
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2 Agilent 83491/2/3A Modules—At a Glance 2-2 Front-Panel Features 2-4 Block Diagrams 2-7 To Display a Signal 2-8 To Compensate for Module Insertion Loss 2-9 Using Probes with an Agilent 83491A 2-10 To compensate for a passive probe 2-11 To compensate an Agilent 54701A active probe 2-11 To compensate for other devices 2-12 Operation
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Operation Agilent 83491/2/3A Modules—At a Glance Agilent 83491/2/3A Modules—At a Glance The Agilent 83491/2/3A are designed to operate in an Agilent 83480A digital communications analyzer. These modules recover clock and data information at standard telecom and datacom rates. The resulting trigger signal is made available to the Agilent 83480A 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
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Operation Agilent 83491/2/3A Modules—At a Glance WARNING Light energy can radiate from the front panel OUTPUT connectors on Agilent 83492A and 83493A modules. The light emitted from these connectors is the slightly attenuated light that is input to the front- panel INPUT connector. Use with Agilent 71603B or 71612B Error Performance Analyzers The front-panel Data and Clock outputs provide electrical recovered clock and regenerated data signals for simultaneous testing with other instruments,
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Operation Front-Panel Features Front-Panel Features Figure 2-2. Agilent 83491/2/3A front panels SELECT key Pressing this key changes the modulation rate of the input signal. The recov- ered 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 main- frame. Refer to “Block Diagrams” on page 2-7 to view a schematic of the nor- mal and bypass paths. 2-4
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Operation Front-Panel Features Green and red data-rate lights The data-rate indicator lights 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 adja- cent 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
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Operation Front-Panel Features 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 modules use 9/125 µ m single-mode fiber. Connecting multimode fiber to the Optical Input connector results in large reflections and insertion loss. Recovered Clock The recovered clock signal is routed directly to the Agilent 8
