Waveshare CM4 Dual Gigabit Ethernet Base Board for Raspberry Pi Compute Module 4 (Model: CM4-DUAL-ETH-BASE / SKU: 20885)

For sale is an authentic Waveshare Dual Gigabit Ethernet Base Board designed specifically for the Raspberry Pi Compute Module 4 (CM4) ecosystem.

This carrier board transforms any Raspberry Pi CM4 into a high-throughput, low-power dual-port Gigabit hardware router, firewall, IoT gateway, or home server. It is widely used for networking and virtualization projects running OpenWrt, pfSense, OPNsense, OpenMediaVault, Pi-hole, AdGuard Home, and Home Assistant OS.

With two physical RJ45 Ethernet ports, dual 4K HDMI outputs, three USB Type-A ports, a wide-voltage DC power input (7V–36V), dual camera inputs, and an onboard Real-Time Clock (RTC), this board provides commercial-grade networking capabilities in a compact footprint.

🔌 Raspberry Pi CM4 Compatibility Guide

• Universal CM4 Support: Fully compatible with all 32 configurations of the Raspberry Pi Compute Module 4 (1GB, 2GB, 4GB, and 8GB RAM variants; with or without onboard Wi-Fi/Bluetooth).

• High-Density Board-to-Board Connectors: Dual 100-pin mezzanine connectors ensure stable mechanical mounting and reliable PCIe/USB/HDMI signal integrity.

• CM4 Lite (Non-eMMC): Uses the onboard push-push MicroSD card slot for operating system installation and booting.

• CM4 eMMC (8GB / 16GB / 32GB Flash): Boots directly from onboard eMMC flash. The integrated USB Type-C port allows fast flashing via rpiboot. (Per Raspberry Pi hardware design specifications, the onboard MicroSD slot is automatically disabled when an eMMC module is attached).

• Heatsink & Cooler Clearance: Standard M2.5 mounting holes accommodate official and third-party CM4 active fan heatsinks or passive aluminium spreaders.

🛠️ Key Hardware Features:

• Dual Gigabit Ethernet (2x RJ45): Dual independent physical network interfaces suitable for dedicated WAN/LAN routing, network segregation, and hardware firewalling.

• Dual Full-Size HDMI Outputs: Dual 4K display connectivity using standard HDMI cables with no adapters needed.

• Extensive USB Connectivity: 3x external USB Type-A ports for peripherals, drives, or cellular dongles, plus 1x USB Type-C port for eMMC flashing and service.

• Industrial Wide-Voltage DC Input (7V–36V): The 5.5mm DC barrel jack supports wide input ranges, making it suitable for automotive, solar, telecommunications, and industrial DC setups.

• Full I/O Expansion: Standard Raspberry Pi 40-pin color-coded GPIO header, dual MIPI CSI-2 camera ports (CAM0 & CAM1), and a MIPI DSI display ribbon connector.

• Thermal & System Management: Onboard 4-pin PWM fan header with speed control and a dedicated CR1220 battery holder for the onboard Real-Time Clock (RTC).

📊 Technical Specifications:

• Brand: Waveshare

• Board Model: CM4-DUAL-ETH-BASE

• Packaging SKU: 20885

• Socket: High-density board-to-board mezzanine connectors for Raspberry Pi CM4

• Networking: 2 x RJ45 Gigabit Ethernet (10/100/1000 Mbps)

• USB: 3 x USB 2.0 Type-A + 1 x USB Type-C interface

• Display Output: 2 x Full-Size HDMI (up to 4K 60Hz) + 1 x MIPI DSI

• Camera Input: 2 x MIPI CSI-2 connectors

• Expansion: Standard 40-Pin Raspberry Pi GPIO Header

• Storage Slot: MicroSD Card slot (for CM4 Lite modules)

• Power Input: DC 7V – 36V via 5.5mm x 2.1mm / 2.5mm Barrel Jack

• Onboard Indicators: PWR (Power) & ACT (Activity) Status LEDs

📦 Package Includes:

• 1 x Waveshare CM4-DUAL-ETH-BASE Carrier Board

• 1 x Original Waveshare Packaging Box