Conversation

Notices

1. Embed this notice
   ✧✦✶✷Catherine✷✶✦✧ (whitequark@mastodon.social)'s status on Thursday, 06-Jun-2024 00:27:23 JST ✧✦✶✷Catherine✷✶✦✧

   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

   • Embed this notice
     ✧✦✶✷Catherine✷✶✦✧ (whitequark@mastodon.social)'s status on Thursday, 06-Jun-2024 00:27:22 JST ✧✦✶✷Catherine✷✶✦✧

     in reply to

     • baloo

     @baloo @0x47df PCIe works even better

   • Embed this notice
     niconiconi (niconiconi@mk.absturztau.be)'s status on Thursday, 06-Jun-2024 00:27:22 JST niconiconi

     in reply to

     • baloo

     @whitequark@mastodon.social @baloo@sfba.social @0x47df@duckpon.de

     Haelwenn /элвэн/ :triskell: likes this.
   • Embed this notice
     baloo (baloo@sfba.social)'s status on Thursday, 06-Jun-2024 00:27:23 JST baloo

     in reply to

     @whitequark @0x47df How about PCIe?

   • Embed this notice
     ✧✦✶✷Catherine✷✶✦✧ (whitequark@mastodon.social)'s status on Thursday, 06-Jun-2024 00:28:56 JST ✧✦✶✷Catherine✷✶✦✧

     in reply to

     • Ignas Kiela
     • niconiconi
     • rf

     @niconiconi @ignaloidas @rf @0x47df incredible

     (niconiconi have I ever told you that you're incredibly knowledgeable?)

     Haelwenn /элвэн/ :triskell: likes this.
   • Embed this notice
     niconiconi (niconiconi@mk.absturztau.be)'s status on Thursday, 06-Jun-2024 00:28:58 JST niconiconi

     in reply to

     • Ignas Kiela
     • rf

     @ignaloidas@not.acu.lt @whitequark@mastodon.social @rf@mas.to @0x47df@duckpon.de Some USB 3 hubs allow you to force-disable U1/U2. You then disable U3 in OS. Problem "solved."

   • Embed this notice
     Ignas Kiela (ignaloidas@not.acu.lt)'s status on Thursday, 06-Jun-2024 00:28:59 JST Ignas Kiela

     in reply to

     • rf

     @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)

   • Embed this notice
     rf (rf@mas.to)'s status on Thursday, 06-Jun-2024 00:29:00 JST rf

     in reply to

     @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

   • Embed this notice
     ✧✦✶✷Catherine✷✶✦✧ (whitequark@mastodon.social)'s status on Thursday, 06-Jun-2024 00:29:00 JST ✧✦✶✷Catherine✷✶✦✧

     in reply to

     • rf

     @rf @0x47df I think so, and I think there would be timings to relax (power management comes to mind)

   • Embed this notice
     niconiconi (niconiconi@mk.absturztau.be)'s status on Thursday, 06-Jun-2024 00:29:38 JST niconiconi

     in reply to

     @whitequark@mastodon.social @0x47df@duckpon.de Tried that in 2022. I can confirm it works. (Still no time to actually finish and publish that...)

     Haelwenn /элвэн/ :triskell: likes this.
   • Embed this notice
     Haelwenn /элвэн/ :triskell: (lanodan@queer.hacktivis.me)'s status on Thursday, 06-Jun-2024 00:30:06 JST Haelwenn /элвэн/ :triskell:

     in reply to

     • niconiconi
     @niconiconi @whitequark Nice FibreChannel :D
   • Embed this notice
     Ignas Kiela (ignaloidas@not.acu.lt)'s status on Thursday, 06-Jun-2024 00:30:59 JST Ignas Kiela

     in reply to

     • niconiconi
     • baloo

     @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)

     Haelwenn /элвэн/ :triskell: likes this.
   • Embed this notice
     niconiconi (niconiconi@mk.absturztau.be)'s status on Thursday, 06-Jun-2024 00:31:56 JST niconiconi

     in reply to

     @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 receiver 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.

     Haelwenn /элвэн/ :triskell: likes this.
   • Embed this notice
     niconiconi (niconiconi@mk.absturztau.be)'s status on Thursday, 06-Jun-2024 00:36:44 JST niconiconi

     in reply to

     • Haelwenn /элвэн/ :triskell:

     @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.

     Haelwenn /элвэн/ :triskell: likes this.
   • Embed this notice
     Haelwenn /элвэн/ :triskell: (lanodan@queer.hacktivis.me)'s status on Thursday, 06-Jun-2024 00:37:54 JST Haelwenn /элвэн/ :triskell:

     in reply to

     • niconiconi
     @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)
   • Embed this notice
     Stephen 🐈 🇨🇦 (stephen@crabsin.space)'s status on Thursday, 06-Jun-2024 00:52:32 JST Stephen 🐈 🇨🇦

     in reply to

     • Haelwenn /элвэн/ :triskell:
     • niconiconi
     @lanodan @whitequark @niconiconi MIT flea market has ruined my living conditions. Love it tho
     Haelwenn /элвэн/ :triskell: likes this.