The parts only just reached earlier XENPAK or XFP modules

X2 defines a smaller form-factor 10 Gb/s pluggable fiber optic transceiver optimized for 802.3ae Ethernet,ANSI/ITUT OC192/STM- 64 SONET/SDH interfaces,ITUT G.709,OIF OC192 VSR,INCITS/ANSI 10GFC (10 Gigabit Fibre Channel) and other 10 Gigabit applications.X2 is initially centered on optical links to 10 kilometers and is ideally suited for Ethernet,Fibre Channel and telecom switches and standard PCI (peripheral component interconnect) based server and storage connections. X2 is physically smaller than  XENPAK-10GB-LR but maintains the mature electrical I/O specification based on the XENPAK MSA and continues to provide robust thermal performance and electromagnetic shielding. The 10GB X2 fiber optic transceivers series include X2-10GB-SR, X2-10GB-LR, X2-10GB-ER and X2-10GB-ZR, they are designed based on the X2 MSA and IEEE802.3ae. They’re created for the integrated systems solution provide, fiber optics distributor along with other IT distributors.XENPAK is 10G fiber optic transceiver. It supports all optical ports as Only 2 left in stock defined in IEEE 802.3ae, supporting speed 10.3 Gb/s,9.95 Gb/s or 3.125 Gb/s. XENPAK modules designed XAUI interface and knowledge shaping (CDR) function, which comply with the XENPAK MSA protocol and satisfy the application of 802.3ae Ethernet protocol 10GB. The 10G XENPAK optical modules include XENPAK 10GBASE-SR 300 meters (multimode OM3 fiber), XENPAK 10GBASE-LRM multimode fiber 220 meters, XENPAK 10GBASE-LR single-mode fiber 10-20km, XENPAK 10GBASE-ER single-mode fiber 40 km, XENPAK 10GBASE-ZR single-mode fiber 80km.