Dualcomm ETAP-2003 is a Network Tap for use with a 10/100/1000Base-T Ethernet link, which is a replacement for the old model DCGS-2005L or DCGS-2005. ETAP-2003 is solidly constructed with a metal case and is probably the smallest in size of all the GbE Network Taps available on the market. ETAP-2003 can be powered from a computer's USB port with a built-in inrush current limiting circuit to prevent the computer from possible damages or disturbances by an instantaneous current surge when ETAP-2003 is being powered from a USB port of the computer. ETAP-2003 is compatible with "Power over Ethernet" (PoE) so that deployment of an ETAP-2003 Network Tap would not block the end-to-end flow of PoE inline power, which is a very useful feature for monitoring or capturing data traffic of a PoE Ethernet link. As a network monitoring and troubleshooting instrument, ETAP-2003 is highly reliable with consistence performance. It has been tested with the maximum in-line cable length of 200 meters at a full 1Gbps data throughput with no single packet loss. All these make ETAP-2003 an ideal portable network traffic sniffing device for monitoring and troubleshooting data traffic in a 10/100/1000Base-T Ethernet network.