Hi-Link HLK-MT7621A Gigabit Gateway Router Module - Linux OpenWRT, RGMII/MII Interface

The HLK-MT7621A module operates on a 3.3V DC supply. It is critical to provide a stable and clean 3.3V power source, as voltage fluctuations or spikes outside the specified tolerance can damage the sensitive processor and onboard circuitry.

The module provides three PCI Express (PCIe) host controller interfaces. These can be used to connect compatible PCIe Wi-Fi cards (for 802.11ac access points) or PCIe-based 4G/LTE cellular modems. Additionally, USB 3.0 and USB 2.0 host ports are available for connecting dongles or other peripherals.

Yes, the module is designed for custom firmware development. It ships with a Linux 2.6 SDK and is fully compatible with the OpenWRT distribution. Developers can use standard cross-compilation toolchains for MIPS architecture to build and deploy custom router, firewall, or IoT gateway applications onto the module's flash storage.

The single RGMII (Reduced Gigabit Media Independent Interface) / MII (Media Independent Interface) port allows you to connect an external Ethernet PHY (Physical Layer) chip. This is useful for adding additional wired network ports beyond the integrated 5-port Gigabit switch or for implementing custom network interface configurations in your gateway design.

Yes, the MT7621A SoC includes a dedicated hardware cryptography engine. It accelerates IPSec protocols, providing VPN encryption and decryption throughput in the range of 400 to 500 Mbps, which significantly reduces CPU load and enables high-performance secure tunnel establishment for router and gateway applications.