What is the fine-grained topic of the following text: FiberOnSale supply different types of WDM BIDI SFP transceivers, such as Fast Ethernet (FE) BiDi SFP, Gigabit Ethernet (GE) BiDi SFP, 155M BiDi SFP, 622M BiDi SFP, 2.5G BiDi SFP, and they can support transmission distance up to max 120km. Only return the topic.
WDM BIDI SFP transceivers offered by FiberOnSale