XENPAK Transceiver modules are offered for physical

supporting speed 10.3 Gb/s,9.95 Gb/s or4×3.125 Gb/s. XENPAK Transceiver modules designed XAUI interface and data shaping (CDR) function, which comply with the XENPAK Transceiver MSA protocol and meet the application of 802.3ae Ethernet protocol 10GB important components inside the Xenpak is the MUX/DEMUX parts, it consume 50% of the power and result in the bigger size. XENPAK Transceiver modules are offered for physical layer interfaces supporting multi-mode and single mode fiber optic cables and InfiniBand copper cables with connectors referred to as CX4. Transmission distances vary from 100 metres (330 ft) to 80 kilometres  copper cables with connectors known as CX4. Transmission distances vary from 100 metres (330 ft) to 80 kilometres (50 mi) for fiber and up to 15 metres (49 ft) on CX4 cable. Newer XENPAK Transceiver using the 10GBase-LX4 standard operated using multiple wavelengths on legacy multi-mode fibres at by both switch and NIC vendors in the industry. These modules that go along with the 10GbE networking products are an interesting beast.