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Positioning Application, SimCHAN: When arming/running a scenario what causes the message "Error: switch modes#1 don't match: incorrect signal types" ?

  • PosApp (SimGEN / SimREPLAYplus / SimREPLAY)
  • GSS6700
  • SimCHAN v3-00 or later
  • GSS6300 / GSS6300M


  • This above error occurs due to a mismatch between the sig_gen.txt and the signal generator capabilities.
    • The sig_gen.txt file details are used to enable correct selection of scenario signal types which match the expected simulator capabilities
    • Only when the scenario is started, during the ARming phase, does the software actually confirm the expected signal capability with the simulator hardware itself
    • If there is a mismatch the scenario cannot continue into its running phase
  • In the above example error message
    • PosApp (running in SimGEN mode), using the sig_gen.txt file, has expected the GSS6700 to have GPS L1 only signal capability
    • The GSS6700 itself actually has GPS L1 + GLONASS L1 signal capability
  • The most likely causes for this mismatch is during a system upgrade
    • The unit has been upgraded with the new feature key but the new sig_gen.txt file has not been copied to the software directory, e.g. C:\Program Files\Spirent Communications\Positioning Application
    • The new sig_gen.txt file has been copied to the software directory but the unit has not been upgraded with the new feature key / the feature key upgrade failed
  • If you are having difficulty with your system upgrade please contact Spirent Global Services as follows:-
    • Open a new Service Request using the 'Submit a Service Request' link on the right-hand side of the Knowledge Base area
    • Confirm the model number and serial number of the simulator involved
    • Confirm that you have followed the instructions in DCS0038B
    • Provide a screenshot of the 'string send' utility required in DCS0038B, showing all commands and responses that have been sent / received
    • Provide a copy of the latest sig_gen.txt file provided by Spirent
    • Provide a copy of the feature key you're trying to use and confirm what signal capabilities the feature key is intended to enable

Product : SimCHAN,SimREPLAYplus,SimREPLAY,SimGEN,PosApp,GSS6300,GSS6700,GSS6300M