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X.25 Protocols

X.25 is the ITU-T standard that defines how connections between DTE and DCE are maintained for remote terminal access and computer communications in PDNs. X.25 specifies LAPB, a data link layer protocol, and PLP, a network layer protocol. Frame Relay has to some degree superseded

X.25 PAD
Protocol Translation

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Technology Information
- X.25 PAD
  - X.25 Frequently Asked Questions 18-Feb-2019
- Cisco Network Solutions for the Telco DCN: Transmission Equipment in X.25 Environments 25-Oct-2007
- Cisco Network Solutions for the Telco DCN: Telephone Switch Environments 25-Oct-2007
Configuration
- TCP over X.25 23-Oct-2018
- Configuring X.25 PVCs 22-Apr-2008
- X.25 Back-to-Back Connections 12-Dec-2007
- X.25 to TCP Translation 12-Dec-2007
- Configuring a Router as a PAD for XOT to an Asynchronous Host 12-Dec-2007
- X25 Over TCP/IP With XOT Keepalives 10-Mar-2006
- X.25 over TCP/IP 01-Jun-2005