| 1 Jun 2025 |
 emily | hey do you remember when I was like, what's a good router?, and the reply was put NixOS on the BPI-R4 it's a no-brainer it just works | 11:58:52 |
 K900 | It's not supposed to be autonegotiated because it's supposed to be a static transceiver | 11:59:05 |
| K900 | That just identifies to the host with normal SFP capability bits | 11:59:31 |
| emily | don't buy TP-Link you'll get compromised you gotta own your network gateway buy this development board with no RF shielding that offloads everything to opaque proprietary vendor firmware blobs anyway | 11:59:31 |
| emily | just want you all to know that I'll never forgive you | 11:59:40 |
 magic_rb | :D | 11:59:53 |
| K900 | And then the host shoves raw whatever down the wire | 11:59:54 |
| emily | (okay I forgive K900 for giving the vital caveat that it's jank) | 11:59:55 |
| K900 | E X C E P T | 12:00:01 |
| K900 | The part where this PON thing lies to you | 12:00:11 |
| emily | okay so like | 12:00:18 |
| K900 | And it's not actually 2500base-x | 12:00:22 |
| emily | here's something from the amazon description of a transceiver i was looking at | 12:00:36 |
| emily |
Set to the X position: Ethernet ports only support 1000/2500M autonegotiation.
a:When connected at 1000M: HOST interface is forced into 1000Base-X mode
b:When connected at 2500M speed: HOST interface is forced into 2500Base-X mode
| 12:00:45 |
| emily | I guess this isn't autoneg? | 12:00:49 |
| K900 | And it's really a computer pretending to be a transceiver plugged into fiber plugged into a transceiver plugged into a computer | 12:00:49 |
| emily | it's just the transceiver only advertising one rate? | 12:00:54 |
| K900 | Yes | 12:01:05 |
| K900 | As you should | 12:01:08 |
| emily | okay but hmmm | 12:01:14 |
| K900 | Except my PON thing advertises FIVE | 12:01:16 |
| emily | let's say I'm a manufacturer trying to make the best 10G/5G/2.5G/1000BASE-T transceiver ever | 12:01:31 |
| K900 | Because unlike the lantiq ones that do the arguably as sane as possible thing | 12:01:36 |
| emily | I know that some things will only support up to 2500BASE-X, but some things will only support 10000BASE-X | 12:01:51 |
| emily | and I want to support plugging in 2.5GBASE-T and using it with either of those devices | 12:01:58 |
| K900 | And actually change their SFP identification bits depending on how they're configured | 12:02:08 |
| emily | don't I really wish I could advertise both 2500BASE-X and 10000BASE-X to the thing I'm plugged into? | 12:02:08 |
| emily | and let it pick based on what it supports? | 12:02:14 |
| K900 | This thing just has a singular literal EEPROM | 12:02:21 |
| K900 | Hardwired to the pins | 12:02:31 |
