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8. Troubleshooting

  • Polarization incorrect

    To receive the horizontal or vertical message the transmission axis must be horizontal, the handgrip must be either horizontal or vertical and the connectors must point downward at an angle. Each unit is evaluated separately.

  • The link cannot be established

    Start with the most “resilient” configuration, i.e. Bandwidth 7 MHz, TX Modulation QPSK, Coding strength High, RF power +3 dBm. TX and RX channels must be the same as the RX and TX channels in the remote unit. When the connection has been established and the antennas have been directed, continue to operation parameters.

  • Access to the Local unit is blocked

    Access to the Local unit may be accidentally blocked, for instance by disabling HTTPS access. If you can access the Remote unit over HTTPS, type its address in your web browser’s address field. The link will transfer the packet over the Local unit with blocked service access all the way to the Remote unit, which will give you access to the control menus of both units. Attention, the Remote unit will report as Local.

  • Distinguishing Local-Remote

    The unit accessed via service access always reports as Local. If you connect through another (peer) unit and radio channel, certain amount of caution is necessary. For example, do not activate the Spectrum analyser in Continuous mode.
    Local and remote can be differentiated through CLI. Type t t l 30s to interrupt the radio link for 30 seconds. If you lose connection to the unit, you accessed the remote unit via radio channel. After 30 seconds the link can be resumed.
    In Linux you can compare the ping times for Local and Remote. Pinging a unit over radio channel takes approximately 0.1 ms longer.

  • Access security

    For better protection against unauthorised access to configuration you should only allow as few way of access as possible. The most secure type is SSH with key – leave only SSH checked. Leave HTTPS, Telnet and Allow password boxes unchecked.

  • Graphs take too long to display

    Use a different browser than Internet Explorer. We recommend Mozilla Firefox.

  • RSS

    To configure the link and monitor its state several menus display the RSS signal strength. Please keep in mind, that Ray is not a measuring instrument, hence the precision of the RSS reading is limited. Though in most situations the RSS reading accuracy is better than ± 2dB, the absolute RSS value should not be used for accurate comparisons e.g. between two links.

  • https certificate problem

    This problem can occur when you upgrade the firmware to version See the Appendix F, Https certificate

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