Mimosa Backhaul Help Content
Mimosa Backhaul Troubleshooting Guide
Copyright © 2014 Mimosa Page 196
properly on both sides, the shield can act like an antenna and introduce noise into the circuit. Some sources of
interference include FM radio transmitters, or cables carrying Sync over Power signals, so efforts should be made to
avoid them. Router firmware incompatibilities can also affect Ethernet negotiation at 1000BaseT.
Example Event Log Messages
MIMO_EVENT ethernet link down
MIMO_EVENT ethernet link up (1000/Full)
MIMO_EVENT ethernet link down
MIMO_EVENT ethernet link up (100/Full)
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Troubleshooting Steps:
Ensure that high quality shielded CAT6 cable is installed between the Mimosa PoE and Mimosa radio, and that1.
the total cable length is 100 meters (328 feet) or less.
Ensure that no additional Ethernet surge protection devices are installed between the PoE and Mimosa radio.2.
Protection is already included in the Mimosa Radio and PoE. Additional hardware may increase capacitance
and cause instability.
Ensure that the electrical ground between radio and tower, and the ground from tower to earth have <53.
ohms resistance in total.
Ensure that the Ethernet cable is separated from any wiring bundle containing Sync over Power or similar4.
periodic power signals.
Test continuity of the CAT6 cable shield from one end of the cable to the other with a digital multimeter.5.
Ensure that the cable shield makes contact with both the radio's Ethernet input and PoE output connector6.
shells.
Ensure that the IP67 Ethernet gland is installed to prevent moisture from entering the cable.7.
Test cable wiring integrity with an Ethernet cable tester, and/or use a second cable to rule out an internal8.
cable issue.
Ensure that the bend radius of the cable does not exceed the manufacturer's specifications. Sharps bends or9.
kinks can damage the cable or change the isolation between wire pairs within the cable which can degrade
performance.
Repeat the test indoors from router to PoE to the Mimosa radio exhibiting the problem.10.
Test for ground loops indoors by installing an EMI filter and/or non-grounded AC adapter between the PoE11.
power connector and AC receptacle.
Repeat the test indoors from router to PoE to a different Mimosa radio to rule out an Ethernet hardware12.
failure if step above fails.
Connect a laptop with a 1000BaseT Ethernet port to the PoE to determine if the connection rate is dependent13.
upon the connected router. Alternately, connect another switch between the router and PoE
Try changing to the same static values on both router and Mimosa radio (e.g. force 100BaseT or 1000BaseT14.
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