Layer 1+2 Protocols (Physical)
- Ethernet
- GFP ITU-T G.7041 Generic Framing Procedure
- OTN ITU-T G.709 Optical Transport Network also called Optical Channel Wrapper or Digital Wrapper Technology
- ADSL Asymmetric digital subscriber line
- ISDN Integrated Services Digital Network
- PDH Plesiochronous Digital Hierarchy
- o T-carrier (T1, T3, etc.)
- o E-carrier (E1, E3, etc.)
- RS-232, a serial line interface originally developed to connect modems and computer terminals
- SDH Synchronous Digital Hierarchy
- SONET Synchronous Optical NETworking
- Modem standards/ITU V-Series Protocols used to communicate between analog modems over voice telephone lines.
Read more about this topic: List Of Network Protocols (OSI Model)
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