Mimosa Client Help Content
Mimosa Clients Troubleshooting Guide
Copyright © 2014 Mimosa Page 86
Port Flapping (alternating between 100BaseT and 1000BaseT)
It is possible for FM interference on a radio tower to couple into the cable on unshielded cable. If the cable shield is
not connected properly on both sides, the shield can act like an antenna and introduce noise into the circuit. 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)
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.
Test continuity of the CAT6 cable shield from one end of the cable to the other with a digital multimeter.4.
Ensure that the cable shield makes contact with both the radio's Ethernet input and PoE output connector5.
shells.
Ensure that the IP67 Ethernet gland is installed to prevent moisture from entering the cable.6.
Test cable wiring integrity with an Ethernet cable tester, and/or use a second cable to rule out an internal7.
cable issue.
Ensure that the bend radius of the cable does not exceed the manufacturer's specifications. Sharps bends or8.
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.9.
Test for ground loops indoors by installing an EMI filter and/or non-grounded AC adapter between the PoE10.
power connector and AC receptacle.
Repeat the test indoors from router to PoE to a different Mimosa radio to rule out an Ethernet hardware11.
failure if step above fails.
Connect a laptop with a 1000BaseT Ethernet port to the PoE to determine if the connection rate is dependent12.
upon the connected router. Alternately, connect another switch between the router and PoE
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