The NWK954 is a fully integrated, unmanaged, 4-port Fast Ethernet Repeater conforming to the IEEE 802.3 100BASE-TX Standard. The device integrates the 802.3 Repeater functions with four 100BASE-TX PHY modules, enabling direct connection to the isolation transformers with no additional PHY components. It has built-in LED drivers for display of port activity and network utilization. There is a local expansion port which allows up to six NWK954s to be cascaded to form a 24-port repeater with no additional components. With the addition of simple backplane driver/receivers, up to eight 24-port repeaters can be stacked. The NWK954 is supplied in a 128-pin PQFP and interfaces to the twisted pair media through 1:1 isolation transformers.