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Notes: The Physical Layer in Detail
How computers move ones and zeros across the wire.
The Physical layer represents the physical devices that interconnect computers. This layer includes the specifications for the networking cables, the connectors that join devices, and the specifications describing how signals are sent over these connections.
This story is part of the “notes” series. “Notes” stories are just this; my notes on various things I read about. I decided to make them public because they might be useful to others as well. Enjoy!
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Transmitting Bits Across the Wire
The Physical Layer of the TCP/IP model is the most complex of all other layers. Its primary purpose is to move ones and zeros (i.e., bits of information) from one end of the link to the next. However, advanced mathematics, physics, and electrical engineering principles come together to make this happen at incredible speeds.
The physical layer consists of devices (e.g., a Hub) and other means (e.g., cables) to transmit bits across computers. It does not matter if you’re…
