Fast Ethernet PHYs Transceivers Fast Ethernet PHYs (Physical Layer) Transceivers feature low power dissipation, a small form factor, high performance, and a highly advanced feature set. The low power consumption of the Fast Ethernet PHY Transceivers enables network systems manufacturers to decrease system cost by reducing both power supply and fan requirements. The Fast Ethernet PHYs Transceivers also feature Marvell Virtual Cable Tester® (VCT) Technology, allowing end-users, IT managers, and networking equipment manufacturers to analyse quickly and remotely the quality and attributes of the cable, avoiding unnecessary equipment returns and on-site service calls.