Xpak and X2 optical modules are evolved from the Xenpak standard, and its internal functional modules and Xenpak basically the same, the application of the circuit board are the same, all modules can be realized using a 10G Ethernet optical interface functions. Xenpak optical modules installed in the circuit board slot on the circuit board is required to achieve more complex and can not achieve high-density applications. The Xpak and X2 optical modules Xenpak an improved only about half the size, can be directly put on the board, so for high-density rack systems and PCI card applications.
Xpak and X2 optical modules can provide two circuit interface: XAUI and Serial Framer Interface (SFI-4), which can be used for 10G Ethernet, can also be used for Cisco SDH SFP Transceiver and 10GFC. It can be said Xpak and is very similar to the standard X2, X2 major changes compared to Xpak reflected in the rail system, the industry generally believe that the ultimate fusion of the two specifications will be together. The intelligent OC3 SFP/STM-1 SFP fiber optic transceiver supports the SONET/SDH over Bundle (TSoP) protocol. And this intelligent OC3 SFP/STM-1 SFP fiber optic transceiver is able to convert the SONET/SDH signal into the bundle signal so your SDH SFP module transfers the 155M OC33/STM-1 signal directly in a routers and bundle buttons.
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