Mimosa Backhaul Help Content
Mimosa Backhaul Troubleshooting Guide
Copyright © 2014 Mimosa Page 205
Low Tx/Rx Power
The Tx/Rx power per chain is shown on the lower right-hand corner of the Dashboard page under the heading,
"MIMO Status". There are 4 chains on a B5/B5c. If one or more of these values is lower than the others, performance
may be lower than expected. Follow these troubleshooting steps if you observe low Tx/Rx power (ranging -100 to -
85 dbm, or blank "-").
Low power on all chains (B5/B5c)
Consistent low power across all chains is likely due to long distance or EIRP limitations for selected channels. Use
the Mimosa Design application to model the link for comparison with actual performance. This will help determine if
the observed performance is expected, or if some other problem exists.
Potential solutions include the following:
Aim the antennas to achieve higher signal strength at each receiver
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Increase Tx Power
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Select a portion of spectrum that allows higher EIRP limits
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Select a narrower channel width
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Select a single channel instead of two channels
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Install a higher gain antenna
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Relocate antennas to avoid permanent or temporary physical obstructions impairing the Fresnel zone
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Consider adding a relay site at the midpoint between the two locations
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Low power on a single chain (B5c)
If Tx/Rx power is low on a single chain, the problem is almost always related to the RF cable or connector between a
B5c and the antenna. Potential solutions include the following:
Verify that the antenna meets the recommended antenna specifications.
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Verify that the RF cables meet the recommended cable specifications.
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Ensure that coaxial cables are installed on the same polarization at both the radio and antenna (H to H and V to
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V).
Swap both ends (radio and antenna) of the RF cables between horizontal and vertical polarization. If the
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problem follows the cable, replace the cable. You may also need to perform this step on the opposite side of the
link.
Low power on two chains with same polarization (B5c)
If Rx signal strength values are between -100 and –85 dBm (or blank "-") on both chains of the same polarization
(Chains 1 and 3 are horizontal, Chains 2 and 4 are vertical), there are two potential root causes/solutions:
This symptom can also be the result of cabling problems as described above in this document: See "Lower
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power on a single chain (B5c)".
ESD is another potential cause, but is quite rare: See Field Notice FN-B5c-0001.
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Low power on a single channel (B5/B5c)
If you observe low Rx power on one of two channels in a dual channel mode (2x20, 2x40, 2x80, or 1x FD modes),
but not on the other channel:
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