Troubleshooting

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8. Troubleshooting

  • Polarization incorrect

    To receive the horizontal or vertical message for TX 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. This configuration depends on the type of unit. We recommend to use the narrowest available bandwidth (e.g. 3.5 MHz), the lowest modulation level (QPSK) and maximum available output power. 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.

    The units operating in licensed bands (RAy10, RAy11) are mounted with the same TX polarization (both unit handles horizontaly or both verticaly).
    The units working in ISM band (RAy17, RAy24) must be mounted one with TX horizontal polarisation (horizontal handle) and the second with TX vertical polarisation (vertical handle).

  • 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, not to reduce the transmission power so that the link interrupts accidentally. Errors of this type should be fixed by rollback function within approx. 1 minute.

    Resolution can be done by comparing the length of ping on Local and Remote. Pinging the unit behind the radio channel is slower. The difference is more pronounced in case of a long packet and the low speed of the radio channel.

  • Access security

    For better protection against unauthorised access to configuration you should only allow as few kinds of access as possible. The most secure type is SSH with key – leave only SSH checked.

  • 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.

  • Problem with https certificate

    See the Appendix E, Https certificate