Radio antennas are connected to the Cisco FM4200 Fiber using quick-
disconnect sub-miniature version A (QMA) connectors.
WARNING
Before activating the unit, make sure that all RF feeds are
securely connected to an appropriate antenna. Never activate
any transceiver unit that is not connected to an antenna.
Cisco uses copper-tin-zinc-plated female QMA connectors. These
connectors are capable of corrosion resistance that exceeds the demands
imposed by ASTM B117 salt spray testing. The connectors are virtually
immune to corrosion, provided that they do not remain in contact with
standing salt water for long periods of time.
In the opinion of Cisco engineers, certain brands of QMA plug have
shown outstanding performance. We can confidently recommend the
following brands:
• Amphenol
• Huber+Suhner
• Rosenberger
• Radiall
CAUTION
Do not remove the protective rubber sleeves from a female
QMA plug (below) if an antenna will not be connected to the
plug. Unprotected QMA plug contacts that are exposed to
water will oxidize, causing degraded performance.
Figure 9. Protective rubber sleeves
Hardware installation
© 2021 Cisco and/or its affiliates. All rights reserved. Page 49 of 189
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