Gigabit PoE/PoE+/PoE++ Ethernet Transformers HALO Electronics Gigabit PoE/PoE+/PoE++ Ethernet Transformers address the isolation, insertion loss, and return loss requirements of IEEE 802.3ab for 1000BASE-T applications. These high-performance Gigabit Ethernet isolation modules are available as single and dual port transformers in many circuit designs and package types.