Allied Telesis' offers twisted pair hubs intended to connect IEEE 802.3 10Base-T network segments through one unit. Each hub has one twisted pair port specifically designed with an uplink (cascading) capability supporting a Media Dependent Interface (MDI/MDI-X) crossover switch. These mini hubs utilize the latest IC and Surface Mount Technology (SMT), which increases functionality and reliability. Additionally, these hubs are very small in size yet they provide the complete functionality of large hubs including packet regeneration and network partitioning. The packet regeneration results in a higher performance network by regenerating preamble, retiming the data packets and extending collision fragments to ensure collision enforcement by all nodes. Each segment automatically detects the polarity of the receive pair and reverses should the pair be incorrectly installed. The IEEE defined link integrity test function continually monitors the receive pair to ensure link continuity. It also includes a partitioning capability where each segment automatically disconnects itself after repeated collisions are detected. These mini hubs support jabber lock-up protection on all interfaces, preventing transceiver lock-up resulting from packets that exceed the maximum packet length. Network diagnostic LEDs are provided on the front of the mini hubs to aid in monitoring system and network performance.