The Dualcomm ETAP-2003 is a compact, rugged, and highly reliable Network TAP designed for monitoring and capturing network traffic on 10/100/1000Base-T Ethernet links. Housed in a durable metal enclosure, it is the smallest Gigabit Ethernet Network TAPs available, making it ideal for both portable and permanent deployment. The ETAP-2003 can be powered directly from a computer's USB port and incorporates a built-in inrush current limiting circuit to protect the host computer from excessive startup current. This design minimizes the risk of USB port interruptions or hardware damage caused by sudden current surges. The device is fully compatible with Power over Ethernet (PoE), allowing PoE power to pass transparently between the two in-line network ports without interruption. This capability makes the ETAP-2003 particularly well suited for monitoring traffic on PoE-enabled devices such as IP cameras, wireless access points, VoIP phones, and IoT equipment. As a dependable network monitoring and troubleshooting tool, the ETAP-2003 has been rigorously tested with a total in-line cable length of up to 200 meters while sustaining full Gigabit Ethernet throughput without packet loss. This performance makes it an excellent solution for portable packet capture, network diagnostics, performance analysis, and security monitoring. To enhance network safety, the monitor port blocks ingress traffic by default, preventing monitoring devices from accidentally injecting packets back into the production network. For applications requiring bidirectional communication through the monitor port, the ETAP-2003R variant is available. The ETAP-2003R operates identically to the ETAP-2003 except that ingress traffic on the monitor port is not blocked. With its compact form factor, PoE compatibility, robust construction, and reliable performance, the ETAP-2003 is an ideal solution for network engineers, security professionals, and IT administrators who need a dependable tool for monitoring and troubleshooting Gigabit Ethernet networks.