Any optical module has two functions of sending and receiving, performing photoelectric conversion and electro-optical conversion, so that the optical modules are inseparable from the devices at both ends of the network. Nowadays, there are often tens of thousands of. An optical module is a typically hot-pluggable optical transceiver used in high-bandwidth data communications applications. The fiber positions in a Type B cable are reversed. Optical fiber networks require two fibers to make a complete circuit. Now, the difference between SFP and SFP+ is an important one when troubleshooting: the transceivers are not always interchangeable.