X.25 is an ITU-T standard protocol suite for Packet switching Wide Area Network (WAN) communication.

X.25 network consists of packet-switching exchange (PSE) nodes as the networking hardware, and leased lines, Public Switched Telephone Network connections, or ISDN connections as physical links.

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There might be more information for this subject on one of the following:
  • [#1] - X.25 - based on information obtained 2018-08-20-