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Retronetworking: New Retronetworking Project: Software-Defined Uk0

Added by laforge 10 months ago

Osmocom developer jolly has started a new project for implementing the central-office side of the ISDN U (Uk0 in Germany) interface using a sound card with 192kHz samplerate.

Using this setup, you can connect an ISDN NT for BRI (NTBA in Germany) to your sound card, and provide ISDN services via mISDN.

Some basic information about a first proof-of-concept can be found at Software_Defined_Uk0; stay tuned for more information.

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There is no real documentation yet on how to reproduce this, but code can be found at https://gitea.osmocom.org/retronetworking/uk0 (SDR PHY for Uk0) and https://gitea.osmocom.org/cc/osmo-cc-misdn-endpoint/src/branch/jolly/uk0 (mISDN port to make use of the former).

Osmocom Conferences (OsmoDevCon, OsmoCon, OsmoDevCall): 2022-03-25: Iridium reverse engineering update

Added by laforge 10 months ago

We're happy to announce the next incarnation of OsmoDevCall

This time, Sec and schneider will be presenting an Iridium reverse engineering update

When: Friday, March 25, 2022 from 20:00 CET

Time Topic Who
20:00 Meet and Greet everyone
20:10 Iridium reverse engineering update Sec, schneider
21:00 USSE (Unstructured Supplementary Social Event) everyone

Where: https://meeting5.franken.de/b/har-xbc-bsx-wvs (Big Blue Button of https://franken.de/)

NOTE: There will be no recording of this talk. If you're interested, you have to participate live!

Osmocom Conferences (OsmoDevCon, OsmoCon, OsmoDevCall): 2022-03-11: USB-C - the connector and USB-PD

Added by laforge 11 months ago

We're happy to announce the next incarnation of OsmoDevCall

This time, tsaitgaist will be presenting on USB-C - the connector and USB-PD

When: Friday, March 11, 2022 from 20:00 CET

Time Topic Who
20:00 Meet and Greet everyone
20:10 USB-C - the connector and USB-PD tsaitgaist
21:00 USSE (Unstructured Supplementary Social Event) everyone

Where: https://meeting5.franken.de/b/har-xbc-bsx-wvs (Big Blue Button of https://franken.de/) NOTE: URL has changed recently

OCTOI - Osmocom Community TDM over IP: First ISDN deployment over new OCTOI TDMoIP protocol

Added by laforge 11 months ago

Yesterday, laforge and manawyrm have managed to establish the first successful calls between two ISDN PBX interconnected via the Proposed_efficient_TDMoIP protocol implemented in osmo-e1d using the icE1usb hardware.

The setup looks as follows:

Using this setup we could validate so far:
  • the new, efficient and transparent OCTOI TDMoIP protocol works over public consumer internet access (VDSL on one end / DOCSIS on another end)
  • GPS-locked oscillators on both sides provide stable shared clock for cycle-slip free operation

Contrary to other established TDMoIP protocols, it is both transparent / protocol-agnostic and only transmits those timeslots of a E1 PRI circuit that are in use.

We are therefore fairly certain that this setup can be the basis of the larger intended Community_TDMSS7_Network we have in mind. There is lots of work to do, and we appreciate any help (see project issue tracker).

Osmocom Conferences (OsmoDevCon, OsmoCon, OsmoDevCall): 2022-02-25: Advanced SIM topics: SCP02, OTA, ARA-M, ISIM

Added by laforge 11 months ago

We're happy to announce the next incarnation of OsmoDevCall

This time, laforge will be presenting on Advanced SIM card topics: GlobalPlatform SCP02, OTA, ARA-M, ISIM

The talk covers some of the more advanced topics related to SIM cards:
  • GlobalPlatform commands / SCP02 protocol
  • OTA (Over The Air) RFM/RAM via TS 03.34
  • The ARA-M applet
  • The ISIM application

It is expected that the audience is familiar with SIM card basics, such as SIM/UICC/USIM concepts and the general file system abstraction.

When: Friday, February 25, 2022 from 20:00 CET

Time Topic Who
20:00 Meet and Greet everyone
20:10 Advanced SIM card topics: GlobalPlatform SCP02, OTA, ARA-M, ISIM laforge
21:00 USSE (Unstructured Supplementary Social Event) everyone

Where: https://meeting5.franken.de/b/har-xbc-bsx-wvs (Big Blue Button of https://franken.de/) NOTE: URL has changed

Osmocom Conferences (OsmoDevCon, OsmoCon, OsmoDevCall): 2022-02-11 : No presentation, just USSE

Added by laforge 12 months ago

We're happy to announce the 23nd incarnation of OsmoDevCall

In this edition, we will not have any presentation, as sadly nobody has volunteered to present this time. Nevertheless, we still hold the call in case anyone wants to chat about random stuff.

When: Friday, February 11, 2022 from 20:00 CET

Time Topic Who
20:00 Meet and Greet everyone
20:10 USSE (Unstructured Supplementary Social Event) everyone

Where: https://meeting5.franken.de/b/har-xbc-bsx-wvs (Big Blue Button of https://franken.de/) NOTE: URL has changed!

Retronetworking: German Historical FTZ Standards for ISDN, SS7 and more

Added by laforge 12 months ago

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

OCTOI - Osmocom Community TDM over IP: successful initial proof-of-concept of OCTOI TDMoIP

Added by laforge 12 months ago

Yesterday, the concepts of the Proposed_efficient_TDMoIP could be validated in practice for the first time using the work-in-progress implementation in the laforge/e1oip branch of osmo-e1d

The setup consisted of two icE1usb USB-E1 interfaces with built-in GPS-DO transporting an E1 line over an intermediate IP network. The clock synchronization has been monitored and sufficient stability over a period of several hours was confirmed, with no underruns/overruns or cycle slips.

The compression feature was working as expected: E1 timeslots with no change compared to the previous frame were supressed. The batching feature (32 E1 frames per UDP packet) was equally working as expected.

There's still a lot of work to do to make this more usable via consume internet connections with NAT and dynamic IP addresses, but the concepts could be shown to work in practice:
  • using GPS-DO clocked icE1usb to avoid clock drift
  • using batching of E1 frames
  • suppressing transmission of timeslots with no data

Osmocom Conferences (OsmoDevCon, OsmoCon, OsmoDevCall): 2022-01-28 : Various short [mostly retronetworking] talks

Added by laforge 12 months ago

We're happy to announce the 22nd incarnation of OsmoDevCall

In this edition, laforge will present a number of brief (lightning) talks about a number of projects he's currently been thinking about or working on, including
  • efficient TDMoIP protocol
  • TDMoIP community network
  • hardware design of ISDN BRI interface for TDMoIP community network
  • continuous testing setup for simtrace2 "cardem" firmware
  • non-transparent ISA-over-USB bridge attached to qemu

The idea is to ping-pong some ideas wit others and maybe find somebody interested in helping out.

When: Friday, January 28, 2022 from 20:00 CET

Time Topic Who
20:00 Meet and Greet everyone
20:10 series of brief talks on topics stated above laforge
21:00 USSE (Unstructured Supplementary Social Event) everyone

Where: https://meeting4.franken.de/b/har-xbc-bsx-wvs (Big Blue Button of https://franken.de/)

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