thingsaurus
This is a 'thesaurus for things' or similarity engine: results show things that have something in common with what you enter. The more stars, the more things in common! You can use it for research, recommendations or simply to explore ideas and related subjects.
Here are your results for X.21...
Stars indicate closer matches.
Client to Authenticator Protocol 
- OSI model
- Protocol-control information
- RM-ODP
- Security service (telecommunication)
- X.25
- X.28
- X.32
- X.75
- X.121
- X.400
- X.445
- X.500
- X.509
- X.690
- X.1035
- X.1205
- ASN.1
- 2BASE-TL
- Analog transmission
- Asynchronous serial communication
- Circuit switching
- CoaXPress
- Discrete Multi-Tone
- EIA-530
- EPON Protocol over Coax
- Ethernet in the first mile
- Ethernet over twisted pair
- Ethernet physical layer
- Gigabit Video Interface
- IEEE 802.3
- IP over Avian Carriers
- Line code
- LocalTalk
- LocalTalk-to-Ethernet bridge
- M-PHY
- Modem
- Modulation
- Multiplexing
- Parallel port
- Passband
- Phase-fired controller
- PhoneNET
- Physical Layer Convergence Protocol
- PME Aggregation Function
- Polar modulation
- Repeater
- RONJA
- RS-449
- Run-length limited
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