Wide Area Networks (WAN)

There are a variety of historical Wide Area Networking (WAN) technologies which we are collecting and exploring.

Among those are:

• Modems over analog telephony networks

• ISDN (Intergated Services Digital Network)

• PCM (Pulse Code Modulation) transmission technology

• CSPDNs (Circuit-Switched Public Data Networks) like German Datex-L

• PSPDNs (Packet-Switched Public Data Networks) based on X.25 like German Datex-P

• Digital Telephone Switching (EWSD, System 12, System X, AXE, ...)

• Frame Relay

• DQDB

• PDH (Plesiochronous Digital Hierarchy)

• SDH (Synchronous Digital Hierarchy)

• ATM (Asynchronous Transfer Mode)

• BTX (Videotex / Minitel / Prestel)