Cisco aironet 2800 series - RF Operations on E;P Series APs

RF Operations on “E/P” Series Access Points
Unlike the integrated antenna models, the external antenna model units have four primary RP-TNC connectors
on top of the device and an additional four RF connectors as well as digital via a new smart antenna connector.
Figure 35: Smart antenna connector is an integrated feature of the "E/P" series products
Cisco Aironet Series 2800/3800 Access Point Deployment Guide
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Client Roaming in a Micro and Macro Cell
RF Operations on “E/P” Series Access Points