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laforge, 02/02/2022 09:10 PM

1 1 laforge
h1. X.25
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X.25 is a packet switched technology that falls within the domain of PSPSDN (Packet Switched Public Data Network).  Contrary to the circuit-switched telephony network, it is based on packet switching technology.  It  was the first major vendor-independent / interoperable standard for such networks.
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Interestingly, despite X.25 being packet switched, it has the notion of establishing "calls" over it, and packets are exchanged between the two ends after a conenction setup.  Think in terms of of TCP having a connection abstraction over the packet switched IP network.
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The advantages of X.25 compared to using modems in the PSTN / telephony network were mainly:
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* the modems were used only on the _last mile_ to the next digital switch / central office, and not end-to-end, rendering higher line quality and hence higher data rates than possible over long/bad analog lines
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* billing was usually done based on traffic, not on duration of a call/session
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FIXME: more background information. Diagrams.
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h2. Community X.25 networks
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h3. Telebahn / x25.org
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* https://x25.org/
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* https://groups.io/g/x25
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h3. BAN AI Systems
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* https://ban.ai/x25/
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* https://github.com/orgs/BAN-AI-X25/repositories
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