Multi-Port GigE Ethernet/IP Tester : mTOP™ HD-PacketExpert™ 12/24 ports and mTOP™ Probe Unit
Amazon.com: Ethernet Splitter 1 to 2 High Speed, Gigabit rj45 Ethernet LAN Splitter Adapter Gigabit Fast Internet CAT 5 6 7 8 Network Cable Ethernet Port Simultaiouly Two Device Multi Port Splitter HUB : Electronics