For network designers searching for a reliable 3500 MHz Point of Interface for DAS or IBS deployment, the POI-10083-3500 offers a practical passive RF interface for 3500–3700 MHz wireless systems. This rack-mount POI combines a 3500 MHz input, separated uplink and downlink ports, and a dedicated DL Test Port to simplify installation, commissioning, and ongoing RF monitoring. Its internal circulator, fixed attenuation, adjustable attenuation, and 30 dB coupler help manage signal levels while maintaining measured VSWR performance of 1.41–1.42 on the UL path and 1.35–1.36 on the DL/test path. The design is well suited for telecom equipment suppliers, system integrators, neutral-host networks, and indoor mobile coverage upgrades that need stable RF path loss, defined port isolation, and passive operation. The POI-10083-3500 is an effective solution for high-quality 3500 MHz wireless distribution and professional network infrastructure projects where repeatable interface performance matters.