Tuneable SFP+ is one kind of DWDM transceivers. It is commonly used in DWDM system. In the market, tuneable SFP+ transceivers are often two to four times more expensive than DWDM SFP+ transceivers.
The industry-standard Cisco® Small Form-Factor Pluggable (SFP) Gigabit Interface Converter (Figure 1) links your switches and routers to the network. The hot-swappable input/output device plugs into a Gigabit Ethernet port or slot.
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