Altium NEXUS Documentation

WorkspaceManager_Err-MissingPositiveNetInDifferentialPairMissing Positive Net in Differential Pair_AD

Created: August 3, 2021 | Updated: August 3, 2021
This documentation page references Altium NEXUS/NEXUS Client (part of the deployed NEXUS solution), which has been discontinued. All your PCB design, data management and collaboration needs can now be delivered by Altium Designer (with Altium Designer Enterprise Subscription) and a connected Altium 365 Workspace. Check out the FAQs page for more information.
All Contents

Parent category: Violations Associated with Nets

Default report mode: 


This violation appears when a positive polarity net has not been detected for a particular differential pair object within a design. The negative polarity net for the pair does exist.


If compiler errors and warnings are enabled for display on the schematic (enabled on the Schematic - Compiler page of the Preferences dialog), an offending object will display a colored squiggle beneath it. Hovering over the object will display a pop-up hint that summarizes the violation. A notification is also displayed in the Messages panel in the following format:

Missing Positive Net for differential pair <PairName>, negative net <NetName>


  • PairName is the name of the differential pair for which a positive polarity net has already been defined (e.g., V_RX1)
  • NetName is the name of the negative polarity net (e.g., V_RX1_N).

Recommendation for Resolution

This violation typically arises in the following situations:

  • A differential pair directive has not been attached to the positive polarity wire of the signal pairing. The required net label (e.g., V_RX1_P) has been attached to the wire as required.
  • An appropriately-named net label (e.g., V_RX1_P) has not been attached to the positive polarity wire of the signal pairing. The required differential pair directive has been attached to the wire as required.

To resolve this violation, locate the positive wire object for the pair and ensure that both the net label and differential pair directive are attached and that the name of the net label is specified as required. The net label for the positive wire will be essentially the same as that for the negative wire, but with a _P suffix instead of a _N.


  • Object hints will only appear provided the Enable Connectivity Insight option is enabled on the System - Design Insight page of the Preferences dialog. Use the controls associated with the Object Hints entry in the Connectivity Insight Options region of the page to determine the launch style for such hints (Mouse Hover and/or Alt+Double Click).
Found an issue with this document? Highlight the area, then use Ctrl+Enter to report it.

Contact Us

Contact our corporate or local offices directly.

We're sorry to hear the article wasn't helpful to you.
Could you take a moment to tell us why?
200 characters remaining
You are reporting an issue with the following selected text
and/or image within the active document: