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If you have a valid Calnex Support Service (CSS) contract, please request the latest Paragon-X software (Release 28X) by sending an email including the serial number of the relevant instrument to

Older Paragon-X releases and the latest CAT software can be downloaded from Software Downloads on the Calnex website. Release notes are also available from the same location.

A CSS login is required to access the software download area. If you do not yet have a login, please register on the site.

Note: PFV is not available separately from the website. The Paragon-X installer includes the latest Paragon-X GUI, CAT and PFV.

X.10.41.xx (28X)

The X.10.41.xx release includes CAT and PFV v25.00.


  • Added support for peer-to-peer devices that use software timestamping. For peer-to-peer devices that timestamp prior to the device edge, the Paragon-X can now use a calculated mean path delay and so no longer requires the user to specify the delay to their timestamper.

  • CAT: Added support for cascaded media convertors. Allows testing to ITU-T G.8273.2 and G.8262 for transmission technologies other than ethernet with two devices acting as back-to-back media convertors.

Defect Fixes

  • [PX-4969] In MSE mode, port 1 should not be selectable for SyncE wander measurement

  • [PX-5019] 1588-2008 profile – specific Annex J setting options

  • [PX-5025] Configure Capture setting for 1/2-step appears to affect CAT PDV measurements

  • [PX-5035] Displayed PTP offset in Settings Display window is wrong in MSE mode if G.8275.1 profile is used

  • [PX-5045] ESMC Port1 Rx State is not captured when running BC mode test and capturing at the Slave

  • [PX-5049] Need to change Paragon-X Thru Mode Filtering to enable identification of Delay Responses for individual Slaves when in Multicast mode

  • [PX-5060] SyncE Wander Transfer: When Enhanced Defaults are selected, the Lower Limit should be enabled

  • [PX-5074] 802.1AS default Scaled Offset Log Variance has changed from 0x4100 to 0x436a

X.10.40.18 (27X Patch #1)

The X.10.40.18 release includes CAT and PFV v24.00.


  • CAT: Adds support for the ITU-T G.8271.2 pk-pk time error limit

  • CAT: Double-click .cdf now opens the CAT and loads the file

  • Announce messages are now included in the default capture filter settings when using the Start measurement button in MSE

  • Ethernet and 1pps cable delay maximum value changed from 1us to 5us

Defect Fixes

  • [PX-5020] Recording a workflow to set flow filters causes 'settings conflict' error if MSE is started before filters are set.

  • [PX-5011] Script Recorder generating wrong Python format for importimpairmentdata

  • [PX-5010] Trying to load an impairment profile that does not exist gives error "Only files of same capture type can be imported for Replay"

  • [PX-4999] SyncE Wander Transfer Table incorrectly reporting fail on Gain for Frequencies above 10Hz

  • [PX-4990] Configuring TC Test to Unicast results in missing Delay Response messages

  • [PX-4245] Script Generator issue: when importing flow filters cfd file using P-X GUI, script generator does not generating corresponding commands
    Note: The commands are now generated but manual editing is required. There are missing double quote characters round the filename, so the generated script will fail unless these are added

  • [PX-4965] Packet loss when SyncE wander being applied at same time as PTP generation and measurement.
    In release X.10.40.11, an issue was detected which could lead to PTP packets being dropped when SyncE wander was also being generated by the Paragon-X,
    This release resolves this issue, and the full expected range of PTP packet generation and application of SyncE wander stress signals can be applied simultaneously.

  • [CAT-6109] CAT: No Help available for Metric Time Of Day

  • [CAT-6096] CAT: Minor error in mask for "G.8262 standard 11.2.1 EEC-Option 1 holdover"

  • [CAT-6015] CAT: CAT taking many minutes to open very large .clxz file

  • [CAT-5982] CAT: No Help available for G.8273.2 Noise Transfer (Clause 7.3) and Jitter Metrics

  • [CAT-5972] CAT: DTE Pk-Pk metric on graph no longer turns white when pass

  • [CAT-5894] CAT app goes all-white after extended live capture

  • [CAT-5864] CAT: Closing CAT while it's loading a live capture file crashes P-X GUI

  • [CAT-5772] CAT: Report Generation does not highlight PktoPk failures in Dynamic Time Error HF metric

  • [CAT-5404] CAT: Double-click .cdf should open CAT and load file

  • [PFV-533] PFV: Negative correctionField values handled incorrectly

  • [PFV-525] PFV: Rules file for G.8265.1 fails for ethernet type when Vlans are being used

  • [PFV-523] PFV: EtherType is incorrect with VLAN enabled

  • [PFV-517] PFV: Not displaying PTP packets containing >1 VLANS

  • [PFV-507] PFV: No error returned when trying to select a non-existent rules file

  • [PFV-497] PFV: DSCP value '0' reports fail - it should not

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