MikroTik GPEN21 Dual-Input Gigabit PoE Injector 802.3af/at

The MikroTik GPEN21 is a smart power injector and software-controlled repeater designed to simplify last-mile and distribution-layer deployments. It accepts input power from two independent DC sources — a DC jack or a PoE-IN port — and delivers Passive PoE output to downstream Ethernet uplink devices, including MikroTik GPeR and netPower products. Beyond raw power delivery, the GPEN21 runs an intelligent software stack that provides interface management and monitoring, GPEN link fault detection, VLAN support, SNMP reporting, and basic traffic shaping, giving network operators visibility and control that a conventional passive injector cannot offer. A built-in SFP port adds fiber uplink flexibility, allowing the unit to power or aggregate traffic over optical media. The fanless, passively cooled enclosure is rated IP20 and is designed for secure wall or communications-cabinet mounting, with bottom cable routing options to support clean, professional installations in indoor telecom enclosures.

Key features & benefits

• Dual DC Input Sources — Accepts power through both a DC jack (12–57 V) and a PoE-IN port (802.3af/at, 12–57 V), providing flexible installation options and the ability to integrate into existing powered infrastructure without additional adapters.
• Passive PoE Output up to 57 V — Delivers Passive PoE on Ether2 at up to 850 mA (18–30 V input) or 625 mA (30–57 V input), enabling the unit to power downstream Ethernet uplink devices such as MikroTik GPeR and netPower products directly from a single cable run.
• SFP Fiber Connectivity — An integrated SFP port provides a fiber uplink path, allowing operators to power an optical module for provider uplink or to bridge fiber and copper segments within the same unit.
• Advanced Software Feature Set — Runs interface management and monitoring, GPEN link fault detection, VLAN support, SNMP reporting, and basic traffic shaping — capabilities that elevate the device well beyond a simple injector and enable centralized network oversight.
• Fanless Passive Cooling — The fully passive thermal design eliminates moving parts, reducing long-term maintenance requirements and contributing to the unit's approximately 100,000-hour MTBF rating at 25 °C.
• Flexible Physical Installation — The enclosure supports wall mounting or installation inside a communications cabinet, with a bottom cable opening that accommodates direct cable routing or in-wall routing to suit varied site requirements.
• Industry Certifications — Carries CE, EAC, and RoHS certifications and an IP20 ingress-protection rating, confirming compliance with European and Eurasian regulatory requirements and suitability for indoor telecom environments.