Amazon.co.jp: Alvin's Cables M12 4 pin Male to RJ45 Male Network CAT5e Shielded Cord Industrial Ethernet Cable M12 4 Position D Coded to RJ45 Ethernet Cable 1M : Electronics
Amazon.com: MokerLink 8 Port Gigabit Industrial DIN-Rail Ethernet Switch, 16Gbps Switching Capacity, IP40 Rated Unmanaged Network Switch (-40 to 185°F), with UL Power Supply : Electronics
Amazon.com: Mini Industrial 4 Port 10/100/1000Mbps Gigabit Ethernet POE + Switch with SFP Port Din Rail/Wall-Mount 4 Port 10/100/1000BASE-T RJ45 + 1 Port 100/1000FX (SFP) Support 12-48V DC : Electronics
Lonlonty M12 to RJ45 Industrial Ethernet Cable Automation Systems Connection M12 4 Pin D Code Male to RJ45 Male Shielded Cable Cat5e SFTP 24AWG 3m : Amazon.de: Computer & Accessories
Amazon | Industrial Ethernet on the Plant Floor: A Planning and Installation Guide | Lounsbury, Robert | Networks, Protocols & APIs