MikroTik GPEN21 Smart PoE Injector SFP Repeater

The MikroTik GPEN21 is a smart power injector and software-controlled repeater — 2× GbE plus a 1× SFP fiber port, passive PoE-out on Ether2, dual power input, and SwitchOS Lite software features in a wall or cabinet-mountable IP20 enclosure.

**Software-controlled repeater — beyond a passive PoE injector**

The GPEN21 runs SwitchOS Lite and adds active intelligence to the last-mile link: interface management and monitoring, GPEN link fault detection, VLAN support, SNMP reporting, and basic traffic shaping. This makes it a managed network node, not a dumb pass-through injector — faults and traffic anomalies are visible and reportable without on-site inspection.

**SFP port — fiber or copper SFP uplink to provider**

The SFP port allows the GPEN21 to terminate a fiber uplink directly — power an optical SFP module for fiber-to-the-building connections, or use a copper SFP for flexible uplink topology. MikroTik's own framing: customers can use GPEN21 to power an optical module for uplink to provider, or to provide PoE to power an Ethernet uplink via GPeR and netPower products.

**Passive PoE-out on Ether2 — up to 57V, 850 mA**

Ether2 delivers passive PoE-out at up to 57V — 850 mA at low voltage, 625 mA at high voltage. Powers downstream MikroTik devices including GPeR repeaters, wAP APs, and netPower switches directly over Ethernet.

**Dual power input — DC jack or 802.3af/at PoE-in**

DC jack accepts 12–57V. PoE-in accepts 802.3af/at or passive 12–57V. 30W max total, 3W without attachments.

**Canadian market note:** CE, EAC, RoHS only — no FCC, no IC. Wired device, no wireless transmitter — no ISED wireless type approval required.