We're happy to announce the next incarnation of RetroNetCall, the retronetworking oriented spin-off of OsmoDevCall
This time, laforge will be presenting on Teletex: Between Telex and Telefax.
Everyone knows Telefax, and most people will have heard what Telex was. Few people are aware of the designated intermediate system Teletex. It was used like a "remote type writer", where formatted pages of (monospaced) text could be entered, transmitted and printed by a remote typewriter.
When: Wednesday, June 7, 2023 from 20:00 CEST
Time |
Topic |
Who |
20:00 |
Meet and Greet |
everyone |
20:10 |
Teletex: Between Telex and Telefax |
laforge |
21:00 |
USSE (Unstructured Supplementary Social Event) |
everyone |
Where: https://osmocom.org/RetroNetCall (Big Blue Button of https://franken.de/)
We're happy to announce the next incarnation of RetroNetCall, the retronetworking oriented spin-off of OsmoDevCall
This time, tnt will be presenting part 1 of E1: The analog side.
Many of us know E1 circuits from ISDN or GSM A-bis, and are familiar with the digital side of them. Building a related E1 interface mostly uses [still] available LIU (Line Interface Unit) integrated circuits. tnt took it one step further and started to think along the lines of what if I had to do my own LIU analog circuit design?
When: Wednesday, May 3, 2023 from 20:00 CEST
Time |
Topic |
Who |
20:00 |
Meet and Greet |
everyone |
20:10 |
E1: The analog side (part 1) |
tnt |
21:00 |
USSE (Unstructured Supplementary Social Event) |
everyone |
Where: https://osmocom.org/RetroNetCall (Big Blue Button of https://franken.de/)
We're happy to announce the next incarnation of RetroNetCall, the retronetworking oriented spin-off of OsmoDevCall
This time, laforge will be presenting an Introduction to the X.21 interface.
For more background see X21.
Topics include (not limited to)
- electrical signals
- signal timing
- call signaling
When: Wednesday, March 1, 2023 from 20:00 CET
Time |
Topic |
Who |
20:00 |
Meet and Greet |
everyone |
20:10 |
Introduction to the X.21 interface |
laforge |
21:00 |
USSE (Unstructured Supplementary Social Event) |
everyone |
When: Wednesday, March 1, 2023 from 20:00 CET
Where: https://osmocom.org/RetroNetCall (Big Blue Button of https://franken.de/)
We're happy to announce the next incarnation of RetroNetCall, the retronetworking oriented spin-off of OsmoDevCall
This time, laforge will be presenting on DATEX-L, the German circuit-switched public data network which existed from 1967 (!) onwards.
For more background see CSPDN__Datex-L.
Topics include (not limited to)
- timeline / history
- network architecture
- applications
When: Wednesday, February 1, 2023 from 20:00 CET
Time |
Topic |
Who |
20:00 |
Meet and Greet |
everyone |
20:10 |
Datex-L, the German CSPDN |
laforge |
21:00 |
USSE (Unstructured Supplementary Social Event) |
everyone |
Where: https://osmocom.org/RetroNetCall (Big Blue Button of https://franken.de/)
We're happy to announce the next incarnation of RetroNetCall, the retronetworking oriented spin-off of OsmoDevCall
This time, there will be no technical presentation, just an opportunity for retronetworking interested folks to meet and chat.
When: Wednesday, January 4, 2023 from 20:00 CET
Where: https://osmocom.org/RetroNetCall (Big Blue Button of https://franken.de/)
We're happy to announce the next incarnation of RetroNetCall, the retronetworking oriented spin-off of OsmoDevCall
This time, laforge will be presenting on ISDN B-channel protocols: V.110, V.120, X.75, H.221
Topics include (not limited to)
- description of the respective protocol
- look at a protocol trace
- status of open source implementations
When: Wednesday, December 7, 2022 from 20:00 CET
Time |
Topic |
Who |
20:00 |
Meet and Greet |
everyone |
20:10 |
ISDN B-channel protocols |
laforge |
21:00 |
USSE (Unstructured Supplementary Social Event) |
everyone |
Where: https://osmocom.org/RetroNetCall (Big Blue Button of https://franken.de/)
We're happy to announce the next incarnation of RetroNetCall, the retronetworking oriented spin-off of OsmoDevCall
This time, laforge will be presenting a General status update on OCTOI (Osmocom Community TDMoIP)
Topics include (not limited to)
- migation to co-located hub now fully completed
- osmo-e1d status update
- the new osmo-isdntap project for tracing/recording D and B channel data
- Some initial research into H.221 / dissecting video calls
- OCTOI BERT problems
- 4x new Octoi_Event_PBX for rapid deployment of ISDN+POTS at various events
- yate troubles regarding missing call.answer when using record/playback
- resuming work on the BRI interface
When: Wednesday, November 9, 2022 from 20:00 CET
Time |
Topic |
Who |
20:00 |
Meet and Greet |
everyone |
20:10 |
OCTOI Project Status Update |
laforge |
21:00 |
USSE (Unstructured Supplementary Social Event) |
everyone |
Where: https://meeting5.franken.de/b/har-0y1-wch-et4 (Big Blue Button of https://franken.de/)
Thanks to Fritz Elfert, we were able to acquire a full CVS backup of the no-longer-accessible CVS server cvs.isdn4linux.de.
We manually created mapping tables for CVS user names to real names / e-mail addresses and used cvs2git to import those into git repositories for contemporary viewing, analysis and long-term archieval.
The results can be found in our gitea, individual repositories linked below:
In case you're interested in the above, you might also be interested in our previous re-construction of the u-isdn history
A number of previously unavailable historical German national standards related to (mainly) ISDN have been uncovered and are now availale as PDFs from https://people.osmocom.org/laforge/ftz/ (and in more structured presentation with metadata at German_FTZ_ISDN_Specifications).
The standards include, among many others
- 1TR6 - German National ISDN variant of the 1980ies, before Euro-ISDN was introduced in the 1990ies
- 1TR7 - German National SS7 dialect
- various physical layer specs for interfaces such as S2M, V2M, Uk0, Uk2, UG2 and more