Cisco SMA to TNC Antenna Adapter

The Cisco SMA/TNC Antenna Adapter is a simple, purpose-built connector that bridges an SMA antenna termination on one end with a TNC antenna termination on the other. It is a passive coupler, not an active component, so it introduces no signal amplification or radio circuitry of its own; its job is purely mechanical and electrical continuity between two otherwise incompatible connector standards.

This type of adapter is commonly used when a router, gateway, or modem is fitted with one connector style but the antenna, cable, or lightning arrestor on hand uses the other. Rather than replacing an entire cable assembly or antenna, technicians can use this adapter to mate the two components directly, saving time on installs and field service calls where connector mismatches are common.

Built by Cisco Systems for use across its networking and LTE-capable hardware lines, the adapter is designed for straightforward, tool-free installation: thread the SMA end onto the antenna or cable, and the TNC end onto the device or arrestor, and the connection is complete. Because it carries no electronics, it is compatible with any signal type running through standard 50-ohm coaxial antenna cabling, including cellular, Wi-Fi, and GPS feeds, provided both connector genders line up correctly.

Keep one or two of these adapters in a deployment kit alongside spare pigtails and antennas so that connector mismatches never stall an installation. It is a small, inexpensive part that solves a recurring problem in mixed-vendor antenna setups, where SMA and TNC connectors are both widely used but not interchangeable without a bridge like this one.