| 21 May 2025 |
 magic_rb | Unless you plan to have the switch in the wall | 12:16:47 |
| magic_rb | Anyway | 12:16:48 |
| magic_rb | Ive better stuff to do | 12:16:51 |
 matthewcroughan - nix.zone | Well in the case of fiber both sides have to be SFP | 12:16:52 |
 emily | like if you want to spend more money for a less flexible setup you can | 12:16:51 |
| magic_rb | Bye | 12:16:51 |
| emily | but I don't know why you would | 12:16:54 |
| matthewcroughan - nix.zone | No it makes sense now that I remembered on rj45 only one of the sides need to be SFP | 12:17:23 |
| matthewcroughan - nix.zone | You can understand why I wouldn't want to bother the end-user with SFP | 12:17:36 |
| matthewcroughan - nix.zone | do those sfp only switches support negotiating lower data rates like 5G too? | 12:18:05 |
| magic_rb | It depends on the sfp module not switch | 12:18:33 |
| matthewcroughan - nix.zone | So if I plugged the rj45 side of a 10G SFP cat6 setup into a 2.5gbps port on my laptop, it's not going to work unless the SFP I have chosen supports "negotiation" | 12:19:27 |
| emily | well, it can depend on both | 12:19:31 |
| emily | some SFP+ modules will do 10G on the host but negotiate multi-gig | 12:19:39 |
| emily | some of them will negotiate slower rates on the host too | 12:19:47 |
| emily | I'm actually busy looking for the perfect Broadcom SFP+ module right now but it's easy to find ones that just do 10G always if that's what the switch want | 12:20:06 |
| emily | * I'm actually busy looking for the perfect Broadcom SFP+ module right now but it's easy to find ones that just do 10G always if that's what the switch wants | 12:20:07 |
| emily | it's pretty easy to find people talking about what they'll negotiate online anyway | 12:20:35 |
| matthewcroughan - nix.zone | Yeah the issue is that the laptop things are plugging into will vary from 1/2.5/5 | 12:20:38 |
| matthewcroughan - nix.zone | and then if someone comes in with their mega dongles like you, I suppose 10 is possible | 12:21:05 |
| matthewcroughan - nix.zone | https://www.amazon.co.uk/QSFPTEK-10GBASE-T-Transceiver-SFP-10G-T-S-UF-RJ45-10G/dp/B081YKGBR4 | 12:23:40 |
| matthewcroughan - nix.zone | this one says in the title "1.25/2.5/5/10G-T Copper Module SFP+ " | 12:23:54 |
| matthewcroughan - nix.zone | So I assume this means negotiation is possible | 12:24:01 |
| matthewcroughan - nix.zone | That's one expensive SFP though | 12:25:16 |
| emily | again you want to be looking at aliexpress | 12:42:00 |
| emily | and not at 30 m ones | 12:42:04 |
| emily | and at multipacks | 12:42:10 |
| emily | also you can always just buy mostly <10G ones if you expect most users to not use 10G | 12:44:07 |
| matthewcroughan - nix.zone | 5G being an awkward number, is that really an option? | 13:02:00 |
| emily | what do you mean? | 13:02:14 |
