Recently, there has been a surge of interest and activity in using Ethernet as a wide area network (WAN) technology. This is surprising because Ethernet was developed as a local area network (LAN) technology, serving to deliver data between computers within the same building.
“Dark fiber” is a term often heard in conversations about fiber optic communications. Perhaps this is because it has a name that sounds evil or nefarious. But dark fiber is just fiber that has been installed and is not currently in use; instead, it is reserved for spares or future use.