The Lan-ID is the quintessential diagnostic tool for network installers and troubleshooters working with small LANs. Using the Lan-ID, network administrators can quickly confirm features of LAN devices and diagnose problems during LAN installation. With a push of a button, the Lan-ID will determine whether the device you are testing whether it supports the following topologies and capabilities: Auto negotiation. 100BASE-Tx full duplex. 100BASE-Tx half duplex. 10BASE-T full duplex. 10BASE-T half duplex. 100BASE-T4. Moreover, the LAN ID can also act as a network device, negotiating with other LAN devices to determine faults. The auto-negotiation function provides automatic speed matching for multi-speed devices, allowing devices to configure to the best possible mode of operation over a link. When linked up with another LAN device, the Lan-ID will provide the following information about that device: Whether the link is up or not. Whether the device is transmitting a packet or not. Whether the device is working in full duplex mode or half duplex mode. Whether the device is operating in 100BASE-Tx, 10BASE-T or 100BASE-T4 mode. Whether a data transmission error has occurred.