As mentioned before, two main technological classifications can be seen in access telco networks: wired and wireless technologies.
Wired networks generally mean a physical connection to the end user, whereas wireless networks mean an absence of such a physical connection. At the time of this writing, the technological classifications of wired networks are as follows:
Fiber (PON and coarse WDM [CWDM])
Copper (for example, Ethernet)
In the wireless domain, the following three technological innovations were seen as key attributes to access networking:
Basic cellular technology
Infrared and free space optic communication
In its most primitive form, DSL ...