Post AicWVMdAw0DxGep6eG by ignaloidas@not.acu.lt
(DIR) More posts by ignaloidas@not.acu.lt
(DIR) Post #AicWVJdQ4ddXyXul72 by whitequark@mastodon.social
2024-06-05T14:10:17Z
1 likes, 0 repeats
realization: since a USB 3 device can work with two high-speed diffpairs, power, and ground, you could define an embedding of USB 3 over SFP and make your thumbdrive 1000% cooler@0x47df
(DIR) Post #AicWVKlbrfmZUEkoW8 by rf@mas.to
2024-06-05T14:25:25Z
0 likes, 0 repeats
@whitequark @0x47df Could you use your drive over a 10km data cable? For when you don't have space on your desk naturally. Maybe you'd need to relax some timing stuff from the spec
(DIR) Post #AicWVLy3OtKZD7aGYK by whitequark@mastodon.social
2024-06-05T14:32:03Z
0 likes, 0 repeats
@rf @0x47df I think so, and I think there would be timings to relax (power management comes to mind)
(DIR) Post #AicWVMdAw0DxGep6eG by ignaloidas@not.acu.lt
2024-06-05T14:38:24.701Z
0 likes, 0 repeats
@whitequark@mastodon.social @rf@mas.to @0x47df@duckpon.de I think if you present the cable as a bunch of hubs, you wouldn't need to relax timings (but now you got stuff in the data path, so the utility is debatable)
(DIR) Post #AicZYfKCBfxhydDB4K by rf@mas.to
2024-06-05T14:41:39Z
0 likes, 0 repeats
@ignaloidas @whitequark @0x47df Applications: for Art; to prove the human spirit indomitable
(DIR) Post #AicZYgOqBtGvJKOOwq by ignaloidas@not.acu.lt
2024-06-05T15:12:40.107Z
0 likes, 0 repeats
@rf@mas.to @whitequark@mastodon.social @0x47df@duckpon.de some limitations are quite impossible to beat though, like USB 2 has awfully tight timings that cannot be loosened (mostly because it's cost optimized for a single differential pair), that it cannot be extended to more than ~159m, and practically, more than ~50m is rarely seen.I think you can fake some stuff a bit to make it work with longer lengths, but I don't think it's gonna work with all devices, and it's not gonna look to the computer and the device in quite the same way.
(DIR) Post #Aicafq8SUY1RUFhrjk by niconiconi@mk.absturztau.be
2024-06-05T15:03:20.459Z
1 likes, 1 repeats
@whitequark@mastodon.social @0x47df@duckpon.de Tried that in 2022. I can confirm it works. (Still no time to actually finish and publish that...)
(DIR) Post #AicakfloSOA8mtQ15c by baloo@sfba.social
2024-06-05T15:16:55Z
0 likes, 0 repeats
@whitequark @0x47df How about PCIe?
(DIR) Post #Aicakh77SenexGOXwG by whitequark@mastodon.social
2024-06-05T15:19:04Z
0 likes, 0 repeats
@baloo @0x47df PCIe works even better
(DIR) Post #Aicaki8Dg3H46xuwIC by niconiconi@mk.absturztau.be
2024-06-05T15:23:32.822Z
1 likes, 1 repeats
@whitequark@mastodon.social @baloo@sfba.social @0x47df@duckpon.de
(DIR) Post #AicalFdD7qfk0dfegC by niconiconi@mk.absturztau.be
2024-06-05T15:17:41.820Z
1 likes, 1 repeats
@whitequark@mastodon.social @0x47df@duckpon.de For PHY compatibility, one should guard both sides with a known-good USB hub IC, not all USB 3 PHYs can handle the distorted LFPS to start a link it seems (VIA can't, Intel can). But the bare-minimum version is literally just two data lines directly into SFP+, with 50 Ω resistors to bypass receive detection.And you can sell this circuit board with barely any electronics for $200 as a corporate conference room solution! Don't ask how I knew (I couldn't believe I've spent $200 just to reverse-engineer 1-bit of information). The picture is my own implementation.
(DIR) Post #AicanXDEjMGl7CbuuO by ignaloidas@not.acu.lt
2024-06-05T15:26:34.048Z
1 likes, 1 repeats
@niconiconi@mk.absturztau.be @whitequark@mastodon.social @baloo@sfba.social @0x47df@duckpon.de USB 4 as well, until PCIe and USB went different directions on the PAM4/PAM3 split (neither is really available yet)
(DIR) Post #Aicb2CveQWuOYBNiq0 by whitequark@mastodon.social
2024-06-05T15:11:33Z
1 likes, 0 repeats
@niconiconi @ignaloidas @rf @0x47df incredible(niconiconi have I ever told you that you're incredibly knowledgeable?)
(DIR) Post #Aicb8jx4YrgohsA4mW by lanodan@queer.hacktivis.me
2024-06-05T15:29:18.301675Z
0 likes, 0 repeats
@niconiconi @whitequark Nice FibreChannel :D
(DIR) Post #AicbjSFXLAooWEIxY8 by niconiconi@mk.absturztau.be
2024-06-05T15:35:52.307Z
1 likes, 0 repeats
@lanodan@queer.hacktivis.me @whitequark@mastodon.social and it costs $20 instead of $2000, SFP+ included. You can find old Huawei SFP+ from decommissioned ISP servers at Shenzhen flea markets for a few bucks each. I got 10 for $20, truly unbelievable.
(DIR) Post #AicbplpXS8wSz79jRw by lanodan@queer.hacktivis.me
2024-06-05T15:37:28.546819Z
0 likes, 0 repeats
@niconiconi @whitequark I wish there would be hardware flea markets in my area.(Well also wish there wouldn't because then I'd end up with a ton of shit at home)
(DIR) Post #Aicd919uml8dywQd1M by stephen@crabsin.space
2024-06-05T15:50:52.513041Z
1 likes, 0 repeats
@lanodan @whitequark @niconiconi MIT flea market has ruined my living conditions. Love it tho