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Chapter 3

High Accuracy Timing

Warming up the oscillator

T-BERD/MTS/SC Timing Expansion Module User Manual

Page 28

22112315, Rev. 004

July 2017

The TEM Module’s oscillator, when tuned to a highly accurate synchronization source,
can be used as a precise reference clock when analyzing wander or jitter on the 5800v2
test instrument. Specific applications include:

•

Analyzing the wander between two 1 PPS signals to ensure that a primary and
backup timing mechanism are adequately synchronized.

•

Analyzing the wander between a a 1PPS signal under test and the 1 PPS signal
received by the satellite.

•

Analyzing the wander between a 1 GigE Optical Synchronous Ethernet signal and
a TEM Module with an oscillator that has been tuned to provide a precise timing
reference.

•

Analyzing the wander or jitter between an electrical PDH signal and a TEM
Module with an oscillator that has been tuned to provide a precise timing refer-
ence.

Instructions for analyzing 1 PPS and SyncE wander are provided in the

Ethernet, IP,

TCP/UDP, Fibre Channel, VoIP, and Video Testing Manual

that shipped with your

instrument or upgrade.

Instructions for analyzing wander or jitter on electrical PDH signals are provided in the

PDH, SONET, SDH, NextGen, and OTN Testing Manual

that shipped with your instru-

ment or upgrade. This manual also provides an appendix that explains basic jitter and
wander principles, and describes the measurements that are available when testing
jitter and wander using instruments that are optioned and configured to do so.

For details on the device and interface standards for measuring jitter and wander, refer
to

ITU-T Recommendations O.172 and O.173

.

Warming up the oscillator

The rubidium oscillator in the TEM Module needs to warm up before it can tune to a
synchronization source. If the TEM Module is connected to a 5800v2 test instrument
and you configured the TEM Module to turn the oscillator on by default whenever you
turn on the test instrument (

“Specifying oscillator and timing settings” on page 29

oscillator will start to warm up as soon as you turn the 5800v2 on. If you configured the

NOTE: 1 PPS Wander Analysis

If your TEM Module is optioned to do so, you can put the TEM into 1PPS Anal-
ysis mode, then perform highly accurate wander analysis using the supporting
application provided on the TEM. For details, see

Chapter 4 “1PPS Wander

NOTE:

Test instruments must be configured and optioned to support Wander or Jitter
Analysis. Due to intense resource requirements, and the duration of time
required for useful wander analysis, wander applications must be run
exclusively. We recommend providing AC power to your test instrument for the
duration of wander tests.

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Содержание T-BERD 5800

Страница 1: ...T BERD MTS 5800 Timing Expansion Module User Manual ...

Страница 2: ......

Страница 3: ...Viavi Solutions 1 844 GO VIAVI www viavisolutions com T BERD MTS 5800 Timing Expansion Module User Manual ...

Страница 4: ...r TEM Module You may also obtain a PDF by contacting your Viavi Account Manager directly or by calling 1 844 GO VIAVI Terms and conditions Specifications terms and conditions are subject to change without notice The provi sion of hardware services and or software are subject to Viavi s standard terms and conditions available at www viavisolutions com en terms and conditions Open Source Disclaimer ...

Страница 5: ...ion is subject to the following two conditions 1 This device may not cause harmful interference and 2 This device must accept any interference received including interference that may cause undesired operation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the in...

Страница 6: ...nd batteries to Viavi for appropriate disposal If the equipment or battery was imported by a reseller whose name or logo is marked on the equipment or battery then the owner should return the equipment or battery directly to the reseller Instructions for returning waste equipment and batteries to Viavi can be found in the Environmental section of Viavi s web site at www viavisolutions com If you h...

Страница 7: ...ponents 4 Inspecting the components for damage 4 Exploring the TEM Module connector panel 5 Chapter 2 Getting Started 7 Connecting the TEM Module to your test instrument 8 Connecting a GNSS antenna 10 Powering the TEM Module 11 Verifying that you have the correct adapter 12 Using the AC power adapter 12 Turning on the instrument 13 Checking the battery 13 Verifying the local time zone 13 Turning o...

Страница 8: ...ol PTP measurements 26 PTP Delay 26 PTP Delay Symmetry 27 PTP Time Errors 27 One way delay measurements 27 Wander and jitter analysis 27 Warming up the oscillator 28 Configuring the module 29 Specifying oscillator and timing settings 29 Specifying GNSS settings 30 Specifying location settings 31 Survey settings 31 Fixed position settings 32 Saving location coordinates 33 Surveying GNSS constellati...

Страница 9: ... 59 Chapter 6 Troubleshooting 61 About troubleshooting 62 Assembly and setup 62 Can I hot swap the TEM Module 62 Can I hot swap GNSS antennas 62 Operating the TEM Module 62 TEM Module is not recognized 62 Oscillator LEDs are not illuminated 62 No GNSS Time is detected 63 No GNSS Satellites are located 63 Performing tests 63 Application does not appear on the Test menu 64 Test results are inconsist...

Страница 10: ...e specifications 70 Oscillator specifications 71 1 PPS Analysis specifications 71 Appendix B Storage and Shipment 73 Storing the instrument and module 74 Using the instrument and module after prolonged storage 74 Transporting your TEM Module 74 Shipping your TEM Module 75 Disconnecting the components 75 Packing the components 75 Returning equipment to Viavi 75 Glossary 77 ...

Страница 11: ... preface explains how to use this User Manual Topics discussed in this chapter include the following Purpose and scope on page ii Assumptions on page ii Terminology on page ii Related Information on page iii Conventions on page iii Safety and compliance information on page vi Technical assistance on page vi ...

Страница 12: ...ardware components assembled as an instrument and used for testing This manual supports the T BERD MTS 5800v2 test instrument battery module and Timing Expansion Module TEM module which together constitute a T BERD MTS 5800 assembly used for high accuracy timing applications Battery Module The module connected to the back of the 5800 which supplies power whenever power is not provided using the AC...

Страница 13: ... T BERD MTS 6000A MSAM and the T BERD MTS 5800 can all be configured to transmit and analyze ATP payloads and can be used in end to end and loopback configurations during testing Related Information This is the user manual for the T BERD MTS 5800 Timing Expansion Module TEM It provides basic instructions for connecting the TEM to your 5800v2 test instrument connecting a GNSS antenna to the TEM Mod...

Страница 14: ...the Probe Name field Directory names file names and code and output messages that appear in a command line interface or in some graphical user interfaces GUIs NANGT_DATA_DIR results directory test_products users defaultUser xml file name All results okay output message Text you must type exactly as shown into a command line interface text file or a GUI text field Restart the applications on the se...

Страница 15: ...r more information This symbol represents a risk of a hot surface It may be associated with either a DANGER WARNING CAUTION or ALERT message See Table 3 for more information This symbol represents a risk associated with fiber optic lasers It may be associated with either a DANGER WARNING CAUTION or ALERT mes sage See Table 3 for more information This symbol located on the equipment battery or the ...

Страница 16: ... www viavisolutions com en services and support support technical assistance CAUTION Indicates a potentially hazardous situation that if not avoided could result in minor or moderate injury and or damage to equip ment It may be associated with either a general hazard high voltage or risk of explosion symbol See Table 2 for more information When applied to software actions indicates a situation tha...

Страница 17: ...ral description of each of the TEM Module Topics discussed in this chapter include the following About the TEM Module on page 2 Features and capabilities on page 2 What ships with the TEM Module on page 3 Unpacking the components on page 4 Inspecting the components for damage on page 4 Exploring the TEM Module connector panel on page 5 ...

Страница 18: ...on source for example a GNSS satellite or an external 1PPS or 10MHz reference clock After tuning the oscillator on the TEM Module can be used as the timing source when performing measurements that require highly accurate timing or to provide an external timing reference to another device Holdover mode After the TEM Module s oscillator warms up and is tuned to the frequency of the synchronization s...

Страница 19: ...to operate as a PTP slave and measure time errors and PDV against a PTP Grandmaster or boundary clock Wander analysis You can use the TEM Module as a highly precise reference when conducting 1PPS Wander measurements with a 1PPS input signal under test You can also use the TEM Module to provide a highly precise timing refer ence when conducting DS1 E1 10MHz 2MHz Clock and 1GigE Optical Ethernet wan...

Страница 20: ...inspect them for damage If undamaged consider saving the box and packing materials in case you need to repackage the components for shipment For information about shipping equipment see Appendix B Storage and Shipment Inspecting the components for damage After you unpack the components examine the connectors ports and LEDs for damage Be sure to check the top bottom and front and back panel of the ...

Страница 21: ...onnectors For detailed connector specifications refer to Appendix A Specifications of this manual SMA connector An SMA connector labeled GNSS Antenna is provided for a GNSS antenna SMB connectors 1PPS input and output Two SMB input connectors are available for 1 PPS input signals labeled 1 PPS IN 1 and 1 PPS IN 2 A single 1 PPS input connector can be used to receive an external 1 PPS signal and tu...

Страница 22: ... 10 MHz input and output labeled 10 MHz OUT and 10 MHz REF IN The connector labeled 10 MHz OUT can be used to provide an external disciplined 10MHz timing reference to other instruments and emulate an accurate master 10MHz clock The connector 10 MHz REF IN can be used to receive an external 10MHz timing reference and tune the TEM Module s rubidium oscillator Specifications for the SMB connectors a...

Страница 23: ... how to navigate the user interface Topics discussed in this chapter include the following Connecting the TEM Module to your test instrument on page 8 Connecting a GNSS antenna on page 10 Powering the TEM Module on page 11 Verifying the local time zone on page 13 Turning on the Rubidium Oscillator on page 14 Navigating the TEM Module user interface on page 15 Turning off the instrument on page 19 ...

Страница 24: ...he 5800 obstructing the label you can assume that the instrument is a 5800v2 v1 5800 s do not support the connection of additional modules Power down the 5800 and disconnect the AC power adapter The TEM Module is not hot swappable To connect the TEM Module to your test instrument 1 Remove the four screws that hold the back cover in place 2 Lift off the back cover to expose the connector then verif...

Страница 25: ...our test instrument T BERD MTS 5800 Timing Expansion Module User Manual July 2017 22112315 Rev 004 Page 9 3 Locate the hinges on the TEM Module 4 Insert the hinges into the 5800v2 at about a 45 to 60 degree angle 5 Pivot the module down towards the connector ...

Страница 26: ...S antenna A Viavi qualified GNSS antenna ships with each TEM Module The cable is 3 meters long and the antenna is equipped a magnetic base and a male SMA connector The TEM Module ships with a default Antenna Bias value of 28 which is the optimal value for the Viavi supplied antenna If you are using a different antenna you should calculate the cumulative delay introduced by 1 the antenna 2 the ante...

Страница 27: ... synchronization source before it can be used Therefore it is recommended that you power your instrument using the AC adapter when the oscillator is warming up and tuning Optical wander analysis If you intend to use your instrument for optical wander analysis before you start you must connect the AC power adapter that shipped with the instrument When transporting the TEM Module to a test location ...

Страница 28: ...ows the label on the adapter that shipped with T BERD MTS 5800v1 test instruments Do not use this adapter Using the AC power adapter To supply power using the AC power adapter 1 Verify that the AC power adapter is the one that shipped with your 5800v2 see Verifying that you have the correct adapter on page 12 2 Plug the adapter into the power supply jack on the top panel of your instrument 3 Plug ...

Страница 29: ...percentage on the Battery status page 1 Select the SYSTEM icon 2 Select Power Management The battery status appears 3 View the Battery Level The Battery Status page indicates the charge level both in percentage under the battery and the color of the battery whether the adapter is plugged in and indicates the battery temperature range Verifying the local time zone Before using the TEM Module as a t...

Страница 30: ... synchronization source see Specifying oscillator and timing settings on page 29 The LED Panel and a dedicated action button show the oscillator s status as it progresses through each of the modes described in Table 4 NOTE Before using the oscillator as a source of high accuracy timing the oscillator must be left in a controlled environment such as a cell site local central office instrument depot...

Страница 31: ...tuned for at least 17 minutes Intermediate Tune The oscillator is tuned to the frequency of the syn chronization source that you specified when you con figured the oscillator and the oscillator has been tuned for a sufficient period of time to support accu racy in holdover mode after frequency stabilization After you turn the oscillator on it will take at least 20 to 25 minutes to reach an interme...

Страница 32: ... is connected to your instrument a Timing Module tab appears on the Main screen in addition to the tab or tabs for any tests that you have selected The UI elements on the Timing Module tab function in a similar manner to those on the test tabs however the Timing Module tab can not be removed It will be available when ever the module is connected to your instrument and your instrument is powered on...

Страница 33: ... Current and history LEDs The round LEDs on the inside column provide the current state of the key event the square LEDs on the outside column provide the historical state in other words the event occurred in the past LED colors Green LEDs indicate an event occurred as expected yellow LEDs indicate that an event occurred that warrants additional investigation and red LEDs indicate that an error an...

Страница 34: ...different group or category for each pane you can view multiple sets of results at the same time Figure 6 illustrates two results panes with the Satellites group and Sky Plot category selected in the left pane and the Summary group Status cate gory selected in the right pane Timing information results supporting the TEM Module are documented in of this manual test result descriptions are documente...

Страница 35: ...re placing the oscillator into Holdover mode the tuning frequency may drift slightly The oscillator mode status appears on the LED panel and the Action Panel of the UI To disconnect an antenna 1 Verify that the oscillator is in Holdover mode or Fine Tune mode If it is in Fine Tune mode force it into holdover mode using the Force Holdover action key 2 Loosen the connector at the base of the antenna...

Страница 36: ...urn the instrument over so the display is facing downwards and the back panel of the module is facing upwards 3 Loosen the screws on the module 4 Pull gently on the bottom of the module to release it from the connector on the instrument 5 Pivot the bottom of module upwards at about a 45 to 60 degree angle then release the hinges located at the top of the module from the instrument The TEM Module i...

Страница 37: ... accuracy timing reference during testing Topics discussed in this chapter include the following Basic timing principles on page 22 Common test applications on page 26 Warming up the oscillator on page 28 Configuring the module on page 29 Surveying GNSS constellations on page 34 Tuning the oscillator on page 34 Forcing the oscillator into holdover mode on page 35 Qualifying GNSS antennas on page 3...

Страница 38: ...urveys conducted in areas with poor satellite visibility The systems are typically comprised of multiple ground stations that are precisely positioned to support measure ments of the GNSS satellites signals and environmental factors that may impact the quality of the signal received This information is then sent in messages to the supported satellites so that the messages can be broadcast to GPS r...

Страница 39: ... timing you must either specify a survey mode or manually specify the latitude longitude altitude and survey position accuracy for the test instrument If you configure the module to generate accurate coordinates by surveying a GNSS constellation you select a survey mode or manually specify survey settings based on 1 the minimum duration of the survey and 2 the survey accuracy requirement in meters...

Страница 40: ...iled ephemeris data from one or more satellites Calculating the position and timing information using the provided satellite data or Using position information that it already has and is providing timing information without continually recomputing position coordinates After the receiver locates satellites that satisfy the criteria that you specified when you configured the module an illustration o...

Страница 41: ... or a clock that has a Cesium oscillator External BITS SETS timing The TEM Module allows you to synchronize timing to an external BITS SETS reference signal for example a BITS SETS signal from another device in a central office via the EXT CLK connector on the 5800v2 test instrument After tuning the TEM Module s rubidium oscillator to the external signal s frequency you can use your test instrumen...

Страница 42: ...w_Up Delay_Req and Delay_Resp messages between a grandmaster and slave clocks PTP Delay To accurately measure PTP delay you must either use two precisely synchronized Viavi Ethernet test instruments that are optioned and configured for PTP testing or one test instrument synchronized to a PTP Master for example a Grandmaster or Boundary Clock TEM Modules can be used to synchronize 5800v2s to a high...

Страница 43: ...d trip delay measurements because they help you determine whether a problem exists in the upstream or the downstream direction and they do not include the cumulative network delays associated with inbound and outbound traffic To accurately measure one way delay you must use two precisely synchronized Viavi Ethernet test instruments that are optioned and configured for one way delay testing TEM Mod...

Страница 44: ... that shipped with your instru ment or upgrade This manual also provides an appendix that explains basic jitter and wander principles and describes the measurements that are available when testing jitter and wander using instruments that are optioned and configured to do so For details on the device and interface standards for measuring jitter and wander refer to ITU T Recommendations O 172 and O ...

Страница 45: ... the receiver will obtain the timing and location information from GNSS satel lites for example the GNSS system that will provide the information whether augmented information will be used in addition to that provided by the satellites and whether you intend to conduct a survey of satellites to obtain the information Specifying oscillator and timing settings Before tuning the TEM Module s rubidium...

Страница 46: ...eckbox If you do not want the oscillator to turn on automatically when the test instru ment is turned on clear the checkbox 6 In Holdover Drift Allowed ns specify the maximum acceptable drift allowed while operating the module in holdover mode in nanoseconds The module will then estimate the time remaining before the oscillator drifts to an unacceptable level and provide the time remaining in the ...

Страница 47: ...be either disconnected damaged or defective If you are using a passive antenna or splitter another device is providing power to the antenna or you are using a special low power antenna select 0 e The default Antenna Time Bias value is 28 the optimal value for the Viavi qualified antenna If you are using a different antenna determine the optimal bias value by referring to the vendor specifications ...

Страница 48: ...t the Survey Mode Quick Fast Typical Expanded or Manual Surveys conducted for a longer period of time will provide more position measurements and as a result yield more accurate coordinates In Quick mode the survey will run for at least one minute In Fast mode the survey will run for at least fifteen minutes with a survey position accuracy limit of forty five meters In Typical mode the survey will...

Страница 49: ... Accuracy in meters Latitude as degrees Longitude as degrees and Altitude in meters The specified altitude should represent the height above the reference ellipsoid which approxi mates the earth s surface do not specify the altitude as it relates to the height above mean sea level 4 Select the grey Position Fixed action button to the left of the Fixed Position Accu racy m field The button turns ye...

Страница 50: ... constellation has been surveyed When complete the GNSS status on the LED Panel will state Fixed Position Resetting the start location If your survey does not appear to be progressing as expected and the GNSS Location Latitude Longitude and Altitude coordinates are not correct use the Reset Start Location button located on the right of the Survey Mode field The button will turn yellow the GNSS rec...

Страница 51: ...vent log see Event Log on page 51 of Chapter 5 Timing and 1 PPS Analysis Results Tuning to the internal GNSS receiver If you are using the internal GNSS receiver as the synchronization source in addition to oscillator and timing settings you must specify GNSS settings see Specifying GNSS settings on page 30 Location settings Specifying location settings on page 31 If you are conducting a survey to...

Страница 52: ...le To qualify the location of a GNSS antenna 1 Connect the GNSS antenna that shipped with your TEM Module to the module see Connecting a GNSS antenna on page 10 2 Specify the required GPS and location settings see Specifying GNSS settings on page 30 When specifying the settings consider the following When specifying the GNSS system on the GPS tab select the option for the system that includes SBAS...

Страница 53: ...Expansion Module User Manual July 2017 22112315 Rev 004 Page 37 If the signal strength for the satellites used is 40 or higher you can conclude that the antenna is in the optimal location For details concerning the supporting results see Signal Strength on page 54 of this manual ...

Страница 54: ...Chapter 3 High Accuracy Timing Qualifying GNSS antennas T BERD MTS SC Timing Expansion Module User Manual Page 38 22112315 Rev 004 July 2017 ...

Страница 55: ... step by step instructions for analyzing 1PPS wander using the TEM Module Topics discussed in this chapter include the following About 1PPS wander analysis on page 40 Impact on oscillator tuning on page 41 Measuring TIE and calculating MTIE TDEV on page 42 Analyzing 1PPS wander on page 44 Saving and exporting TIE measurement data on page 46 ...

Страница 56: ...ore performing 1PPS wander analysis using the TEM you must turn the oscillator on and wait for it to warm up For details see Turning on the Rubidium Oscillator on page 14 of Chapter 2 Getting Started Signal Input Table 5 lists the connections required to provide the external timing reference signal and analyzed signal to the TEM Module when performing 1PPS wander analysis using the TEM Module in 1...

Страница 57: ...rence the PPS Offset and 10MHz frequency will naturally drift over time This is expected behavior Monitoring oscillator drift You can monitor the time remaining before the frequency drifts to an unacceptable level by configuring the maximum acceptable drift The module will then estimate the time remaining before the oscillator drifts to an unacceptable level and provide the time remaining in the O...

Страница 58: ...nnector 4 Connect the cable providing the signal to be analyzed to the TEM connector labeled 1 PPS IN 2 The reference signal provided by the GNSS tuned oscillator in holdover mode is now provided via the 1 PPS IN 1 connector on the TEM Measuring TIE and calculating MTIE TDEV Measuring TIE and calculating MTIE TDEV involves ensuring that the TEM is placed into 1PPS Analysis mode then enabling and s...

Страница 59: ...scillator to turn on automatically when the test instrument is turned on and start to warm up immediately select the checkbox If you do not want the oscillator to turn on automatically when the test instru ment is turned on clear the checkbox 6 In Holdover Drift Allowed ns specify the maximum acceptable drift allowed while operating the module in holdover mode in nanoseconds The module will then e...

Страница 60: ...f data select the Current Block field type the block number and then select OK The data block you specified appears A block of TIE data is a contiguous subset of all TIE samples that is not inter rupted by any alarms For Wander measurements TIE values are sampled at a constant rate If an alarm occurs e g LOS the receiver is not able to produce meaningful TIE values and stops producing TIE entries ...

Страница 61: ...ight of the Curve Style field and then select Line Dots or Dots only 11 If you want to select a mask to compare the data against do the following a In the Mask Type field specify a mask type b In the Mask field specify a mask to compare the data to The mask curve appears on the result graph If you do not want to compare the data against a mask in the Mask field select None 12 Do one of the followi...

Страница 62: ...a is saved To export the TIE data to a USB memory key 1 Insert a USB memory key into one of the two slots provided on the top panel of the base unit 2 Select the Export TIE Data soft key The Wander Data Files screen appears listing the wander data files in acterna user disk bert reports 3 Select the wander data file you want to export and then press the Export to USB soft key The File Export dialo...

Страница 63: ...nder Analysis Saving and exporting TIE measurement data T BERD MTS 5800 Timing Expansion Module User Manual July 2017 22112315 Rev 004 Page 47 Supported ToD formats for the DUT include NMEA GPZDA and ITU T Draft G 8271 ...

Страница 64: ...Chapter 4 1PPS Wander Analysis Saving and exporting TIE measurement data T BERD MTS 5800 Timing Expansion Module User Manual Page 48 22112315 Rev 004 July 2017 ...

Страница 65: ... available when tuning the TEM Module oscillator for use as a high accuracy timing reference or performing 1 PPS wander analysis Topics discussed in this chapter include the following About TEM Module timing and 1 PPS analysis results on page 50 LEDs on page 50 Event Log on page 51 Satellite Results on page 52 GNSS Results on page 55 Oscillator Results on page 58 1 PPS Analysis Results on page 59 ...

Страница 66: ...ator status is also provided If the TEM is in 1PPS Analysis mode LEDs also indicate whether the reference and analyzed signals clocks are valid If the instrument loses any of the LED events the green Status LED extinguishes and the red Alarm LED in the history column illuminates indicating an error condition has occurred Oscillator LEDs Table 6 describes the LEDs that are provided when the Rubidiu...

Страница 67: ... progresses through the tuning process Each event is numbered sequentially with a date start and stop time stamps 1 PPS Analysis Ref CLK Valid Green A valid reference clock is present Grey A valid reference clock is not present Input CLK Valid Green A valid clock for the analyzed signal is present Grey A valid clock for the analyzed signal is not present Table 6 Oscillator LEDs TEM Mode LED Indica...

Страница 68: ...nal GNSS receiver If the TEM is in 1PPS analysis mode the event log reports an event each time the analyzed 1PPS signal exceeds a value specified for an enabled threshold Satellite Results The Satellites result group provides a sky plot illustrating the satellites identified by your test instrument using the GPS receiver of the TEM Module and the signal strength of each of the identified satellite...

Страница 69: ...e 9 Sample Sky Plot GPS Constellation Table 8 Satellite Status Color Status Indicates Red No Signal A signal from the satellite is not available but the sat ellite s presence is known based on information pro vided in the Almanac and broadcast by other satellites within the constellation Dark Blue Signal The signal from the satellite has been acquired and the GNSS receiver is receiving data Light ...

Страница 70: ...ptions provided in Table 8 Each bar provides the satellite number and an alphabetic code that represents the GNSS identifier A legend is provided to the right of the bars explaining each of the iden tifiers In Figure 10 Satellite G22 provides the strongest signal 43 C No G225 provides the weakest signal 0 C No CNO Map Spectrogram and CNO Map Table Wireless operators often use the GNSS receivers in...

Страница 71: ...il 345 360 and 9 parts of elevation degrees 0 10 10 20 and so on until 80 90 and calcu late a running average of CNO in each of the 135 segments The results are updated every second and represented in two formats a table and a spectrogram The CNO Map Table has 15 azimuth ranges as rows and 9 elevation ranges as columns see CNO Map Table in the picture below The same data is also provided as a spec...

Страница 72: ... satel lites that do not appear in the Sky Plot because they are not currently operating Number of Satellites Used Number of satellites used to derive GNSS timing Status No Lock Indicates that no satellite information is available or if information is available a 3D posi tion could not be calculated Locked Indicates that satellite information is available a 3D position can be calculated and a surv...

Страница 73: ...the GNSS receiver in millimeters Position Dilution of Precision The Position Dilution of Precision PDOP value as provided by the GNSS receiver As the PDOP value increases the accuracy of horizontal and vertical data points decreases therefore lower PDOP values indicate a higher degree of accuracy Survey Mean PDOP The current actively reported average PDOP during the course of a survey After a surv...

Страница 74: ...Est ns Displays the estimated accuracy of the UTC time in nano seconds In order to provide an estimate of UTC time derivable from a GNSS signal a set of UTC corrections is broadcast by the satellite UTC Time Valid Indicates whether the UTC time is valid per the timing information received by the GNSS receiver Table 11 Time results Continued Result Definition Table 12 Oscillator Status results Resu...

Страница 75: ...e 14 ToD Results Oscillator Mode The current mode of the oscillator Warm Up Coarse Tune Fine Tune or Holdover Table 12 Oscillator Status results Continued Result Definition Table 13 1PPS Analysis results Result Description Parameter Measured Offset ns Offset between the reference signal and the 1 PPS input signal Current Minimum Maximum MTIE s Maximum Peak to Peak Time Interval Error MTIE Minimum ...

Страница 76: ...Chapter 5 Timing and 1 PPS Analysis Results ToD Results T BERD MTS 5800 Timing Expansion Module User Manual Page 60 22112315 Rev 004 July 2017 ...

Страница 77: ...is chapter describes how to identify and correct issues related to the operation of the TEM Module Topics discussed in this chapter include the following About troubleshooting on page 62 Assembly and setup on page 62 Operating the TEM Module on page 62 Performing tests on page 63 Maintaining your TEM Module on page 64 ...

Страница 78: ...ional OTDR module Can I hot swap GNSS antennas Yes GNSS antennas are hot swappable It is recommended that the TEM Module s rubidium oscillator be placed into holdover mode to ensure that the accuracy of the oscillator is not affected Operating the TEM Module The following issues may present themselves when operating and performing basic functions using your TEM Module TEM Module is not recognized ...

Страница 79: ...ellites Verify that the GNSS antenna is properly connected see Connecting a GNSS antenna on page 10 and that the antenna power level specified is correct for the antenna that you are using see Specifying GNSS settings on page 30 Verify that you have specified a GNSS system that is available worldwide for example GPS or GLONASS in your geographical region for example BeiDou or both for example GPS ...

Страница 80: ...l The input under test must be connected to the blue CLK 2 IN OUT connector on the adapter If an object or person coming in contact with the instrument causes a temporary burst of errors to be recorded the errors might have been caused by an ESD event The recorded errors can be cleared by pressing Test Restart Please note that the test set is fully compliant with IEC 61326 1 ESD requirements for i...

Страница 81: ...00 Timing Expansion Module User Manual July 2017 22112315 Rev 004 Page 65 Does the module need to be calibrated The TEM Module does not need to be calibrated every time rubidium oscillator is tuned to a high accuracy synchronization source the oscillator is disciplined ...

Страница 82: ...Chapter 6 Troubleshooting Maintaining your TEM Module T BERD MTS 5800 Timing Expansion Module User Manual Page 66 22112315 Rev 004 July 2017 ...

Страница 83: ...odule Topics discussed in this appendix include the following About the TEM Module specifications on page 68 Physical specifications on page 68 Environmental specifications on page 68 Power specifications on page 69 Connector specifications on page 69 Performance specifications on page 70 Oscillator specifications on page 71 1 PPS Analysis specifications on page 71 ...

Страница 84: ...e TEM Module are listed in Table 15 Environmental specifications Environmental specifications for the TEM Module are listed in Table 16 Table 15 TEM Module Physical specifications Dimension TEM Module Height 5 27 inches 13 38 cm Width 5 08 inches 12 90 cm Depth 1 52 inches 3 86 cm Weight 990 lb 45 kg Table 16 TEM Module Environmental specifications Dimension TEM Module Operating Temperature 32 F t...

Страница 85: ...d GNSS Antenna allows you to connect a GNSS Antenna to the TEM Module The connector supports an input signal level ranging from 5 dB to 30 dB For optimal performance maintain gain between 5 dB and 20 dB SMB connectors Table 17 provides specifications for each SMB connector All SMB connectors use 3 3V CMOS technology All SMB inputs are terminated with 50 Ohms to ground Terminated with 50 Ohms Unter...

Страница 86: ...cifications Table 18 Performance GNSS specifications Specification Description Receiver Type 72 channel GPS L1C A GLONASS L1OF BeiDou B1 Time to First Fix Cold Start Hot Start 29 seconds typical no information must obtain valid Almanac time date position and Ephemeris 1 5 seconds typical valid Almanac time date position and Ephemeris is already available Position Update Rate Once per second Table ...

Страница 87: ...TEM Module s Rubidium Oscillator 1 PPS Analysis specifications Table 21 lists accuracy specifications for 1 PPS Analysis Table 20 Rubidium Oscillator specifications Specification Description Phase Noise 1 Hz 10 Hz 100 Hz 1 kHz 10 kHz 70 dBc 87 dBc 114 dBc 130 dBc 140 dBc Table 21 1PPS Analysis specifications Configuration Specification Description 1 PPS IN 1 1 PPS Accuracy 1 ns GNSS 1 PPS 1 PPS Ac...

Страница 88: ...Appendix A Specifications 1 PPS Analysis specifications T BERD MTS 5800 Timing Expansion Module User Manual Page 72 22112315 Rev 004 July 2017 ...

Страница 89: ...e and Shipment This appendix describes how to store transport and ship your test instrument Topics discussed in this appendix include the following Storing the instrument and module on page 74 Transporting your TEM Module on page 74 Shipping your TEM Module on page 75 Returning equipment to Viavi on page 75 ...

Страница 90: ...up the 5800v2 and TEM Module The time required to warm up the TEM Module s oscillator will vary depending on the storage temperature Transporting your TEM Module When taking your TEM Module and 5800v2 instrument to a new location for testing consider the following The auto off Power Management feature on the 5800v2 should be disabled to ensure that the TEM Module does not suddenly lose power Viavi...

Страница 91: ...terial to secure the components inside a box or other container If needed you can obtain appropriate packing materials by contacting Viavi Customer Care at 1 866 228 3762 or at www viavisolutions com Returning equipment to Viavi Before you return any equipment to Viavi contact Viavi Customer Care at 1 844 GO VIAVI or www viavisolutions com for the correct shipping address and for a Return or Refer...

Страница 92: ...ion Module User Manual Page 76 22112315 Rev 004 July 2017 Clearly mark the outside of the package with the Viavi issued Return or Reference Authorization number and ship it prepaid and insured to Viavi For information on pack aging equipment for shipment see Packing the components on page 75 ...

Страница 93: ... Information concerning the time status and location of every satellite within a GNSS satellite constellation Antenna Time Bias A value specified in nanoseconds that is used to compen sate for the delay introduced by your antenna the antenna s cable and if applicable an in line splitter or amplifier Assembly Used throughout this manual to refer to a complete set of components assembled as an instr...

Страница 94: ...nts when connected to build an assembly the T BERD MTS 5800v2 the Timing Expansion Module TEM and the GNSS Antenna that is used to provide GPS timing to the module and test instrument D DHCP Dynamic Host Configuration Protocol A communications protocol that assigns IP addresses dynamically as needed The test instrument supports static IP address assignment E Ephemeris data Information broadcast by...

Страница 95: ... and time of the receiver The TEM Module is equipped with an internal GNSS receiver GNSS System The time reference used by GNSS satellites operated by different countries and available either worldwide for example GPS and GLONASS or in specific areas of the world for example the BeiDou constellation GPS Global Positioning System Time reference used by North and South American GNSS satellites and a...

Страница 96: ...k LiION Lithium Ion The T BERD MTS 5800v2 can be equipped with a rechargeable Lithium Ion battery M Master clock See Grandmaster Clock Msg Message MTIE Maximum Time Interval Error O OWD One Way Delay P Packet Bundle of data configured for transmission Consists of data to be trans mitted and control information Packet Delay Variation The difference in one way delay as experienced by a series of pac...

Страница 97: ...rate timing and supports measurements of delay between a PTP master clock and PTP slave clocks SONET Synchronous optical network SQ See Signal Quality Sync Synchronization SyncE Synchronized Ethernet T TDEV Time Deviation TEM Timing Expansion Module Term See Terminate Terminate An application where the test set is terminating the circuit In these appli cations the test set sends and receives traff...

Страница 98: ...ing A thin client system that enables you to run appli cations on a VNC server from any other computer connected to the Internet Using VNC you can run the T BERD MTS 5800 v2 from a remote workstation and you can run remote applications from the T BERD MTS 5800v2 W WAN Wide area network X XFP 10 Gigabit Small Form Factor Pluggable optical transceiver A variety of optional XFPs are available for tes...

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Страница 100: ...th America 1 844 GO VIAVI 1 844 468 4284 Latin America 52 55 5543 6644 EMEA 49 7121 862273 APAC 1 512 201 6534 All Other Regions viavisolutions com contacts email TAC viavisolutions com 22112315 Rev 004 July 2017 English ...

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