What is the difference between SFP+ and SFP
The difference between SFP+ and SFP. The pinout of SFP and SFP+ connectors are identical. However, SFP is data rate of 6Gb/s, whereas SFP+ is designed for 10Gb/s.
The SFP receptacles and plugs are not as well impedance matched as SFP+ receptacles and plugs.
Also SFP+ cable is designed for 10Gb/s whereas SFP cable may not be able to satisfactorily transmit that rate.
XENPAK is an important step in the evolution of the optical modules. The XENPAK architecture provides a XAUI interface for the Media Access Controller.Compared with not hot-pluggable modules, XENPAK modules is very attractive. But is can’t meet some important market demand. The power consumption of XENPAK is usually 10W, which will cause a certain influence to the structure size because it increase the cost of manufacturing printed circuit board and reduce the precious line space.
X2 modules also adopt the XENPAK electrical interface, but there are a few local exceptions. X2 offers a 4bit port address space, a bit less than XENPAK. X2 also reduces the number of power supply pin. In the aspect of optical technology, X2 supports 10GbE, OC192 synchronous optical network, 10GFC and other standards.
10G small hot-pluggable XFP module is different from the XENPAK architecture and its 4-channel interface. XFP module adopts full-speed single serial module of a XFI (10Gb serial interface) to replace the XENPAK and its derived products. Since the XFP module doesn't have serializer/ deserializer, XFP is smaller, cheaper than XENPAK. And its’ power consumption is also less than XENPAK.