| 1 Jun 2025 |
 emily | I could be totally wrong here but I think they're all kinda the same | 11:46:58 |
| emily | it's copper that's weird | 11:47:07 |
 K900 | That has the modem on the other end | 11:47:08 |
| K900 | And it has like ten different modes it can emulate | 11:47:16 |
| K900 | Over half of which are Realtek vendor bullshit | 11:47:29 |
| emily | for instance I found that this 1000BASE-T transceiver can't do jumbo frames | 11:47:29 |
 magic_rb | In reply to @k900:0upti.me
They emulate a transceiver connected to a non-existent cable The what now, im gonna get a fritzbox with a sfp pon from my provider soon, will try showing it into my bpi to see what happens :D | 11:47:31 |
| emily | so that sucks for me | 11:47:34 |
| magic_rb | In reply to @magic_rb:matrix.redalder.org
The what now, im gonna get a fritzbox with a sfp pon from my provider soon, will try showing it into my bpi to see what happens :D I mean the pon, not the whole fritzbox :D | 11:48:20 |
| K900 | SFP is weird and A LOT | 11:48:46 |
| emily | I've ordered the 100m variant of https://www.luleey.com/product/10gbase-t-sfp-to-rj45-copper-module-30m-80m-100m/ and am just praying that it can:
- do 2.5GBASE-T into 2500BASE-X
- in a way that actually works with the BPI-R4 (new worry added today)
- and not mess up jumbo frames
- and preferably report temperature etc. stats
- and also do the thing where it passes through access to the PHY chip instead of hiding it behind pretending to be a fibre transceiver like apparently a lot of them do?
| 11:49:06 |
| emily | I've found that it's basically impossible to find clear statements from vendors on most of these | 11:49:21 |
| emily | so I'm probably resigned to just sorta buying and returning things until one of them does what I want | 11:49:36 |
| K900 | Like, there's modes where you have the SFP part just doing media conversion, and then there's modes where you have an entirely separate PHY that the device just talks to over SGMII or whatever | 11:49:46 |
| K900 | And everything in between | 11:49:51 |
| emily | by the way I found out that Marvell has a 5 nm 10GBASE-T PHY chip that consumes like < 1 W of power | 11:50:01 |
| emily | but NOBODY has put it in an SFP+ or switch for some reason | 11:50:07 |
| K900 | And then yes there's modes where the devices just fucking lie | 11:50:17 |
| emily | despite seeming like the holy grail of 10GBASE-T | 11:50:20 |
| K900 | Sometimes they both lie to each other just to agree on something | 11:50:35 |
| magic_rb | (Still talking about copper i take it) | 11:50:41 |
| emily | damn… kind of like people | 11:50:50 |
| magic_rb | (Im only interested in fiber for the bpi) | 11:50:53 |
| emily | yes this is about copper SFP+s | 11:51:01 |
| emily | well not even "copper". gah, what are you actually supposed to call Ethernet over 8P8C? | 11:51:13 |
| emily | BASE-T? | 11:51:17 |
| emily | looks like Wikipedia settles on "Ethernet over twisted pair". that's too long. | 11:51:40 |
| magic_rb | Ethernet over twisted pair, idfk | 11:51:43 |
| magic_rb | Ah | 11:51:48 |
| magic_rb | Guess im right lmao | 11:51:51 |
