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Operation

Clock and Data Demultiplexer 44 Gb/s User Guide

The clock input to the Demux is routed through the phase shifter to align the

clock edge to the data. By turning the phase shifter knob the clock edge can

be aligned to the middle of the opening in the input data eye to get an error

free output from the Demux. The phase shifter is a 60° per GHz, 18 turns

phase shifter.

The demuxed data outputs are routed thru Demux Data Out 1 through Demux

Data Out 4 connectors on the front panel. These are 2.92 mm female

connectors. They are single ended AC coupled outputs.

This Manual:http://www.manuallib.com/agilent/n4968a-demultiplexer-user-guide.html

Содержание N4968A

Страница 1: ...es required for verification and operation The shipment includes N4968A clock and data demultiplexer 44 Gb s AC power converter module AC power cord CD containing the N4968A user guide and N4968A data sheet ManualLib com collects and classifies the global product instrunction manuals to help users access anytime and anywhere helping users make better use of products http www manuallib com ...

Страница 2: ...Agilent N4968A Clock and Data Demultiplexer 44 Gb s User Guide This Manual http www manuallib com agilent n4968a demultiplexer user guide html ...

Страница 3: ... covering the material in this document that conflict with these terms the warranty terms in the separate agreement shall control Technology Licenses The hardware and or software described in this document are furnished under a license and may be used or copied only in accordance with the terms of such license Restricted Rights Legend If software is for use in the performance of a U S Government p...

Страница 4: ...ed for indoor use in an installation category II pollution degree 2 environment per IEC 61010 Second Edition and 664 respectively It is designed to operate within a temperature range of 10 to 40 C at a maximum relative humidity of 80 for temperatures up to 31 C decreasing linearly to 50 relative humidity at 40 C at an altitude of 2000 meters This module can be stored or shipped at temperatures bet...

Страница 5: ...ing static discharges to the panel input connectors China RoHS regulations include requirements related to packaging and require compliance to China standard GB18455 2001 This symbol indicates compliance with the China RoHS regulations for paper fiberboard packaging Indicates the time period during which no hazardous or toxic substance elements are expected to leak or deteriorate during normal use...

Страница 6: ...waste Product category With reference to the equipment types in the WEEE Directive Annexure I this product is classed as a Monitoring and Control instrumentation product Do not dispose in domestic household waste To return unwanted products contact your local Agilent office or see www agilent com environment product for more information This Manual http www manuallib com agilent n4968a demultiplex...

Страница 7: ...This Manual http www manuallib com agilent n4968a demultiplexer user guide html ...

Страница 8: ... 14 3 Performance Specifications 15 3 1 General 15 3 2 N4968A Clock and Data Demultiplexer Specifications 16 4 Operation 17 4 1 General Information 17 4 1 1 Performance Recommendations 18 4 1 2 Connector Care 18 4 2 Block Diagram 20 4 2 1 Divide Ratio Switch Settings 21 4 3 Demux by 4 Example with 40 Gb s Data Input 22 4 4 Demux by 2 Example with 20 Gb s Data Input with Full Rate Clock 23 5 Return...

Страница 9: ...Getting Started 8 Clock and Data Demultiplexer 44 Gb s User Guide This Manual http www manuallib com agilent n4968a demultiplexer user guide html ...

Страница 10: ...he equipment could be impaired This product must be used in a normal condition in which all means for protection are intact only Before switching on this instrument make sure the supply voltage is in the specified range This instrument has auto ranging line voltage input Be sure the supply voltage is within the specified range In an ESD safe environment carefully remove the N4968A from the packagi...

Страница 11: ...e instrument away from heat sources 1 3 Performance Recommendations 1 When using differential mode connections ensure the cables are phase balanced 2 Differential connectors may be used single ended if the unused input or output is terminated in 50 Ω 3 Use high quality cables and connector savers or adaptors 4 Keep cable lengths short and minimize number of cable bends 5 Use a 7 to 10 in lbs torqu...

Страница 12: ...ata rate with an adjustable sub rate clock output for triggering BER testers oscilloscopes logic analyzers or other instruments The N4968A also has clock frequency dividers The input clock frequency can be divided down to lower rates to match the de multiplexed data and used to drive equipment such as external error detectors when making a BER measurement 2 1 Features Clock and data demultiplexer ...

Страница 13: ...a eye for error free output from the demultiplexer Data In The Data In and Data In are differential inputs for the data These connectors are 1 85 mm female connectors If the data input is used single ended the input should be connected through a DC block and the unused input should be terminated with a 50 Ω 1 85 mm terminator Demux Data Out The demuxed data outputs are routed thru the Demux Data O...

Страница 14: ...tors The C and G connectors are the outputs of divider number 1 E connector The E connector is the input to divider number 2 which in conjuction with divider numbers 3 and 4 is used to provide sub rate clock outputs for downstream equipment CLK 2 The CLK 2 connector is the input to the phase shifter demux Divide ratio switch The eight switches set the different divide ratios Refer to configuration...

Страница 15: ...ogies may result in personal injury or loss of life To prevent electrical shock disconnect instrument 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 For continued protection against fire hazard replace fuses and or circuit breakers only with same type and ratings The use of other fuses circuit break...

Страница 16: ...arameters of N4968A Operating Temperature 10 to 40 C Storage Temperature 40 to 70 C Power Requirements 42 W External AC Adaptor included 100 to 240 VAC 47 to 63 Hz Physical Dimensions W x H x D 25 4 x 6 35 x 25 4 cm 7 x 2 5 x 10 inches Weight 3 2 kg 7 lbs EMC Complies with European EMC Directive 2004 108 EC IEC EN 61326 1 CISPR Pub 11 Group 1 class A AS NZS CISPR 11 ICES NMB 001 This ISM device co...

Страница 17: ...puts AC coupled 50 Ω nominal 2 92 mm female connectors Clock input Type Half rate clock for demux by 4 mode Full rate clock for demux by 2 mode Frequency 1 75 to 22 GHz for demux by 4 mode1 3 5 to 22 GHz for demux by 2 mode2 Clock amplitude 2 to 10 dBm 0 8 to 2 V p p Interface Single ended input AC coupled 50 Ω nominal 2 92 mm female connector Divided clock outputs Division ratios 1 2 4 8 16 32 an...

Страница 18: ...oaxial cable conductor pins before use to remove static buildup Situate the instrument away from heat sources Do not allow foreign material into enclosure Always use provided AC adaptor Do not power the unit with a different adaptor Do not modify the power plug or wall outlet to remove the third ground pin Do not drop or shake the instrument minimize vibration handle with care There are no user se...

Страница 19: ...e The N4968A features high quality front and rear panel input and output connectors Connector damage will degrade signal fidelity Refer to the N4960 90030 N495xA through N498xA Connector Care Reference Guide at www agilent com find N4968A Agilent Technologies also recommends the following Use a 7 to 10 in lbs torque wrench when attaching connectors Consider using connector savers to prolong perfor...

Страница 20: ... energizing the instrument 1 Remove any dust or loose particles using a low pressure air source 2 Moisten a lint free swab with isopropyl alcohol Do not saturate the swab 3 Minimize the wicking of the alcohol into the connector structure 4 Clean the mating plane surfaces and threads 5 Allow alcohol to evaporate and then use a low pressure air source to blow surfaces clean 6 Make sure no particles ...

Страница 21: ...in either 1 4 demux mode with a half rate clock input or in 1 2 demux mode up to 22 Gb s max data rate with a full rate clock input The clock divider ratios can be set to match the output de multiplexed data rate for sending to external equipment such as a bit error ratio tester or sampling scope Refer to the configuration examples below for setup details in various applications This Manual http w...

Страница 22: ...t to 0 in Figure 4 Figure 4 Dividers switch Table 3 Divider 1 Table 4 Divider 2 Switch 1 Switch 2 Division Ratio Switch 3 Switch 4 Division Ratio 0 0 1 0 0 1 0 1 1 4 0 1 1 4 1 0 1 8 1 0 1 8 1 1 1 2 1 1 1 2 Table 5 Divider 3 Table 6 Divider 4 Switch 5 Switch 6 Division Ratio Switch 7 Switch 8 Division Ratio 0 0 1 0 0 1 0 1 1 4 0 1 1 4 1 0 1 8 1 0 1 8 1 1 1 2 1 1 1 2 This Manual http www manuallib c...

Страница 23: ...s Clock input 20 GHz Data output 4 x 10 Gb s Clock output 10 GHz 2 Loop A to Clk2 provides 20 GHz half rate clock to Demux 3 Loop E to F 4 Set Divider 2 to 5 Set Divider 3 and 4 to 1 provides 10 GHz clock output Figure 5 Demux by 4 example with 40 Gb s data input This Manual http www manuallib com agilent n4968a demultiplexer user guide html ...

Страница 24: ...de ratio of the divider 2 times the divide ratio of the divider 4 Similarly the divide ratio of the divided clock outputs 3 and 4 are the divide ratio of the divider 2 times the divide ratio of the divider 3 The inputs and the outputs of the dividers are differential and the unused inputs and outputs should be terminated with 50 Ω terminators The Data In and Data In are differential inputs for the...

Страница 25: ...ned to the middle of the opening in the input data eye to get an error free output from the Demux The phase shifter is a 60 per GHz 18 turns phase shifter The demuxed data outputs are routed thru Demux Data Out 1 through Demux Data Out 4 connectors on the front panel These are 2 92 mm female connectors They are single ended AC coupled outputs This Manual http www manuallib com agilent n4968a demul...

Страница 26: ...ou cannot correct the problem return it to Agilent Technologies for repair following the steps shown below 1 Record all symptoms 2 Contact Agilent Technologies at http www agilent com find assist 3 Use the original packing material or comparable packing material to ship the instrument to Agilent Technologies This Manual http www manuallib com agilent n4968a demultiplexer user guide html ...

Страница 27: ... Copyright Agilent Technologies 2012 Third edition April 2014 Printed in Germany This Manual http www manuallib com agilent n4968a demultiplexer user guide html ...

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