Ancestors

Toot

Written by Manawyrm | Sarah -> FOSDEM on 2025-01-09 at 20:20

TOSLINK is one of the very few consumer fiber optical standards. It transports digital, uncompressed PCM audio over plastic fibers.

Why not transport IP-over-Toslink instead?

It's a 1.536 Mbit/s data link after all...

https://www.youtube.com/watch?v=9uWi8iWym9c

New blogpost:

https://kittenlabs.de/ip-over-toslink/

/cc @n0emis @benjojo

=> More informations about this toot | More toots from manawyrm@chaos.social

Descendants

Written by Christian Berger DECT 9314 on 2025-01-09 at 20:22

@manawyrm @n0emis @benjojo You probably could have gotten it through on more SFP modules by modulating it. ASK could be done with a simple AND gate and an oscillator.

=> More informations about this toot | More toots from casandro@f-ckendehoelle.de

Written by SDRHoernchen on 2025-01-09 at 20:36

@manawyrm german wireshark is the most unsettling thing i have seen this year... at least so far.

=> More informations about this toot | More toots from SDRHoernchen@chaos.social

Written by Manawyrm | Sarah -> FOSDEM on 2025-01-09 at 20:38

@SDRHoernchen the translation is ... surprisingly okay-ish for such a tool :)

=> More informations about this toot | More toots from manawyrm@chaos.social

Written by famfo (bahn'd) on 2025-01-09 at 20:37

@manawyrm finally, proper PPP over fiber

=> More informations about this toot | More toots from famfo@chaos.social

Written by elly (@FOSDEM) on 2025-01-09 at 20:38

@manawyrm @n0emis @benjojo You absolute madcats have done it again :Blobhaj_Heart:

I wonder how far it could be done using lasers btw, imagine shooting TX/RX using freakin lazers across two buildings

=> More informations about this toot | More toots from elly@donotsta.re

Written by Manawyrm | Sarah -> FOSDEM on 2025-01-09 at 20:43

@elly @benjojo @n0emis This works very well in practice!

DIY Perks did it inside his living room:

https://www.youtube.com/watch?v=1H4FuNAByUs

The folks from Poland did it over about 800m:

https://www.youtube.com/watch?v=ErbLfZXlByo

If you're doing it properly, you could probably bounce the signal off a cloud and still get a proper signal!

=> More informations about this toot | More toots from manawyrm@chaos.social

Written by Mer-fOKxTOwl on 2025-01-13 at 11:29

@manawyrm @elly @benjojo @n0emis i know someone who had a company that moved into a new building across a street.

because their provider did not have the infrastructure for the bandwidth they needed at the new location they set up some laser thingy across the street (somewhere above the 2nd floor) and apparently it worked well, only on rainy days the transfer rate dropped a bit, but they set up some multivectoring with the crappy internet connection they had at the new location for backup.

=> More informations about this toot | More toots from glowl@chaos.social

Written by Wolf480pl on 2025-01-09 at 20:45

@elly @benjojo @manawyrm @n0emis

I vaguely remember @quad mentioning some time ago some commercial laser links that can send ethernet over line-of-sight in the air

=> More informations about this toot | More toots from wolf480pl@mstdn.io

Written by Quad on 2025-01-09 at 21:17

@wolf480pl @elly @benjojo @manawyrm @n0emis I think you're confusing them with IEEE 802.11ad links. Which achieve link speeds above 1 Gbit/s point-to-point with line of sight and 60GHz. Recently IEEE 802.11ay products have also landed which can achieve multi-gigabit links.

But they're radio, not lasers. (They typically include a regular 5GHz radio as well for fallback since even some light rain can/will cut the 60GHz link)

For example UniFi has one literally just called "Building Bridge": https://ui.com/wifi/bridging/building-bridge

Or Mikrotik's "Wireless Wire" range of products: https://mikrotik.com/product/wireless_wire_dish

Though 60GHz is so easy to disturb that in practice they almost function like lasers once you have any considerable distance between them.

=> More informations about this toot | More toots from quad@akko.quad.moe

Written by Wolf480pl on 2025-01-09 at 21:19

@quad I think there were also some surveillence-camera-looking things that use lasers that you stumbled upon once and shared a link, but maybe that wasn't you...

=> More informations about this toot | More toots from wolf480pl@mstdn.io

Written by lpbkdotnet on 2025-01-09 at 22:11

@wolf480pl @quad sounds like an FSO Link?

https://en.m.wikipedia.org/wiki/Free-space_optical_communication

=> More informations about this toot | More toots from lpbkdotnet@mstdn.social

Written by Quad on 2025-01-09 at 22:12

@lpbkdotnet @wolf480pl that's not really commercial afaik

=> More informations about this toot | More toots from quad@akko.quad.moe

Written by Wolf480pl on 2025-01-09 at 22:14

@quad @lpbkdotnet

I think I saw a picture like the one from this paper https://www.researchgate.net/figure/FSO-link-head-connection_fig1_276197318

but more polished and marketing-y

=> View attached media

=> More informations about this toot | More toots from wolf480pl@mstdn.io

Written by lpbkdotnet on 2025-01-09 at 22:21

@quad @wolf480pl they’re not hugely widespread, but they were commercially available 20+ years ago

We trialed some airfibre units back in the early 2000s to provide a link across a river - but they don’t really handle even a small amount of weather and we ended up with an RF link instead!

It looks like you can still get them, but I have no idea why you’d want to when other technologies are available!

https://commconnect.com/free-space-optics.html

=> More informations about this toot | More toots from lpbkdotnet@mstdn.social

Written by Wolf480pl on 2025-01-09 at 22:28

@lpbkdotnet @quad

yesss this!

=> More informations about this toot | More toots from wolf480pl@mstdn.io

Written by Wolf480pl on 2025-01-09 at 22:29

@elly @benjojo @manawyrm @n0emis @quad

I meant this stuff:

https://commconnect.com/free-space-optics.html

thanks @lpbkdotnet for finding it

=> More informations about this toot | More toots from wolf480pl@mstdn.io

Written by Sophie on 2025-01-09 at 20:42

@manawyrm @n0emis @benjojo Well, that escalated quickly! Almost sounds like a movie scene. Hero on the phone with HQ: "No no no, hhat can't be true! ... How did they steal so much data from that airgapped machine? ... They forgot to unplug the TOSLINK cable while fleeing? ... We have to find those hackers!"

=> More informations about this toot | More toots from sophie@chaos.social

Written by wyatt on 2025-01-09 at 20:49

@manawyrm @benjojo one of those things i'd love to do but will probably never do

=> More informations about this toot | More toots from wyatt@soc.megatokyo.moe

Written by Manawyrm | Sarah -> FOSDEM on 2025-01-09 at 20:51

@wyatt Dealing with these sound cards was super duper annoying, I probably had to reboot 10-15 times. Don't use those (and probably don't use an AMD 3rd gen XHCI controller, those seem particularly weird. More investigation needed).

=> More informations about this toot | More toots from manawyrm@chaos.social

Written by wyatt on 2025-01-09 at 20:54

@manawyrm what OS btw?

=> More informations about this toot | More toots from wyatt@soc.megatokyo.moe

Written by Manawyrm | Sarah -> FOSDEM on 2025-01-09 at 20:56

@wyatt Debian 12/bookworm with XFCE.

(both machines with fresh installations of that, because I didn't want to mess up my existing installs with all of this audio & networking stack foolery)

=> More informations about this toot | More toots from manawyrm@chaos.social

Written by jn@qemu-fosdem on 2025-01-09 at 21:23

@manawyrm @n0emis @benjojo PPPoT (:

=> More informations about this toot | More toots from jn@boopsnoot.de

Written by Tom Wardill on 2025-01-09 at 21:45

@manawyrm @n0emis @benjojo

And now I want to know if AX25 (Packet Radio) works over TOSLINK, so I guess I’m buying some sound cards.

=> More informations about this toot | More toots from tom@theclacks.cloud

Written by Manawyrm | Sarah -> FOSDEM on 2025-01-09 at 21:46

@tom if you afsk encode it — sure. if you do the same hdlc trick — same!

you‘ll just need some way to encode the framing :)

=> More informations about this toot | More toots from manawyrm@chaos.social

Written by Domi.UwUException –—=> FOSDEM | i need to pad out this display_name to keep the joke running uhhhhh did you know: i like cats. cats are cool. you should pet a cat today (T&Cs may apply. don't pet if allergic to cats). on 2025-01-09 at 22:20

@manawyrm you’re insane. this is so cool!!

=> More informations about this toot | More toots from domi@donotsta.re

Written by McLP on 2025-01-09 at 22:36

@manawyrm @n0emis @benjojo did someone already tell @TechConnectify about the great use of their video in that demo?

=> More informations about this toot | More toots from mclp@chaos.social

Written by LaF0rge on 2025-01-09 at 22:39

@manawyrm @n0emis @benjojo you could probably also do softmodem over audio over TOSLINK ;) yate can talk to also devices, so there should be a way ... - I know, it has no useful application, other than layering technologies in a way they were never used before. Sadly T1 is 1.544 Mbps otherwise it would also be cool to do T1 over TOSLINK... #retronetworking

=> More informations about this toot | More toots from LaF0rge@chaos.social

Written by Mans R on 2025-01-10 at 10:48

@LaF0rge @manawyrm @n0emis @benjojo Toslink can do 4.6 Mbps (stereo 24-bit at 96 kHz).

=> More informations about this toot | More toots from mansr@society.oftrolls.com

Written by Manawyrm | Sarah -> FOSDEM on 2025-01-10 at 10:54

@mansr @LaF0rge 24-bit, yes...

Not so sure about the 96kHz though.

There are a couple of chips on the market, which claim to be able to do 96kHz, but the spec only allows for up to 48kHz.

=> More informations about this toot | More toots from manawyrm@chaos.social

Written by Mans R on 2025-01-10 at 12:43

@manawyrm @LaF0rge 96 kHz is supported by practically all implementations. A few even do 192 kHz.

=> More informations about this toot | More toots from mansr@society.oftrolls.com

Written by mirabilos on 2025-01-09 at 23:08

@manawyrm @n0emis @benjojo hmmmmm, Linux does not support SyncPPP in the kern…wait, Linux does not do any PPP in the kernel like the BSDs can, right?

=> More informations about this toot | More toots from mirabilos@toot.mirbsd.org

Written by Manawyrm | Sarah -> FOSDEM on 2025-01-09 at 23:11

@mirabilos I think linux has a bunch of PPP functionality in the kernel. It can do sync ppp over ISDN lines, but that might be part of the ISDN stack (it‘s still kernel space).

No way for me to hook this up to alsa without writing a kernel module, though.

=> More informations about this toot | More toots from manawyrm@chaos.social