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tnt, 02/02/2023 12:52 PM
Add datex talk recording


Initially we started to cover a couple of retronetworking topics at the OsmoDevCall, but it really made sense to run the pure retro related topics as a separate series of events. In October 2022, we forked the Retro Net working Call format from OsmoDevCall.

The format serves two major purposes:

  1. technical presentations about retronetworking relevant topics - ideally current/recent developments
    • can be pre-recorded to avoid any problems with technical setup, streaming, ...
    • should ideally have a Q+A session at their initial "airing" during one OsmoDevCall
  2. unstructured supplementary social event (USSE)
    • random chat in audio (optionally video)
    • not recorded, obviously

The recording of the technical presentation should then be permanently made available. The recordings can be found in several formats at . They can hopefully also soon be found at

Not every RetroNetCall would necessarily need the two parts, but I think it would be great if we can make that happen.


Wednesday evening, 8pm CET/CEST, every 1st Wednesday of the month

The next couple of events hence are:

  • Wednesday, March 1, 2023 (E1: The analog side)
  • Wednesday, April 5, 2023
  • Wednesday, May 4, 2023
  • Wednesday, June 7, 2023

Venue / Platform

We are currently using infrastructure of KNF, a German non-profit internet organization of which laforge is a member.

The URL to join the meeting is

There currently is no password or authentication, we try to welcome anyone. If this turns out to be a problem, we might lock it down in the future, let's hope that's not required.

Topics (for the "presentation" part)


This is a wishlist of future topics for the "presentation" part:

Topic Possible Speaker Tentative Date
Teletex: The brief abandoned step between Telex and Telefax
Token Ring
Frame Relay
The X.25 Packet Switched Network
The X.21 synchronous serial interface
Analog Telephone Modems and towards a 2022 OSHW softmodem laforge + tnt
E1: The analog side tnt 2023-03-01
ISDN: Differences DSS1 <-> 1TR6
X.31: Two flavours of X.25 over ISDN
H.221: The first step into ISDN video calls (H.320)


We'll move the events from the above table to here once they have happened.

Topic Speaker Date Video
TDM, E1, PDH, SDH, STM-1 and Pseudowires laforge 2021-11-12 H.264
iceE1usb in practice tnt 2021-11-12 H.264
Retronetworking: V5 interfaces in ISDN/PSTN laforge 2021-12-28 H.264
Osmocom Community TDMoIP (OCTOI) laforge 2022-04-29 H.264
OCTOI project status update laforge 2022-11-09 H.264
ISDN B-Channel protocols (X.75, V.120, V.110, T.70, ...) laforge 2022-12-07 H.264
Datex-L: The German CSPDN (Circuit Switched Public Data Network) laforge 2023-02-01 H.264

Code of Conduct

The existing Code_of_Conduct of our previous physical / on-site / presence meetings applies.

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Updated by tnt about 1 year ago · 23 revisions

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