LaForge's home page (Posts about retronetcall)

RetroNetCall: "Datex-L, the German CSPDN"

Harald Welte — Tue, 31 Jan 2023 16:00:00 GMT

I've presented about Datex-L, the German CSPDN (Circuit Switched Public Data Network) as part of the RetroNetCall talk series on retro-networking technology.

You can find the video recording at https://media.ccc.de/v/retronetcall-20230201-laforge-datex-l-cspdn

I've always been fascinated by "ancient" data communications - both the kind that I personally consciously witnessed from the late 1980s as well as the kind that I never experienced myself (like Datex-L).

I am not an expert in the subject by all means, as I was never involved in its design, implementation or even used it. However, given that there's very few public information online about Datex-L and/or other CSPDNs, I thought I could improve the situation by presenting about it.

RetroNetCall: "ISDN B-Channel protocols"

Harald Welte — Tue, 06 Dec 2022 16:00:00 GMT

I've presented about ISDN B-Channel protocols (X.75, V.120, V.110, T.70, ...) as part of the RetroNetCall talk series on retro-networking technology.

You can find the video recording at https://media.ccc.de/v/retronetcall-20221207-laforge-isdn-b-channel-protocols

Many people with some kind of telecom background are familiar with D-channel (signalling) protocols of ISDN, and you can find many publications on that topic. Surprisingly, much less publications are talking about the B-channel protocols used for data transmission, like VX.75, V.110, V.120, T.70, ...

RetroNetCall: "OCTOI project status update"

Harald Welte — Tue, 08 Nov 2022 16:00:00 GMT

I've presented an OCTOI project status update (Nov 2022) as part of the RetroNetCall talk series on retro-networking technology.

You can find the video recording at https://media.ccc.de/v/retronetcall-20221109-laforge-octoi-status-update

OsmoDevCall: "Retronetworking: V5 interfaces in ISDN/PSTN"

Harald Welte — Mon, 27 Dec 2021 16:00:00 GMT

I've presented on Retronetworking: V5 interfaces in ISDN/PSTN as part of the OsmoDevCall talk series on Osmocom and related technology.

You can find the video recording at https://media.ccc.de/v/osmodevcall-20211228-laforge-retro-isdn-v5