3 ms·

Hmm, lots more transceivers support multimode (not just Ethernet, serial/video etc) and a lot cheaper too. Direct attach is the only way to go for in-rack, both

Hmm, lots more transceivers support multimode (not just Ethernet, serial/video etc) and a lot cheaper too. Direct attach is the only way to go for in-rack, both cost and cooling effects. Probably not the best in an office environment though. In the desktop, QNAP recently released 8/12 port SFP+/T switches starting at US$500, which is the sort of pricing that will push this tech into small business. Probably buggy as hell at saturation and no features, but who cares, these are for doing occasional file transfers instead of passing around USB3 SSD drives. https://nascompares.com/2018/04/12/unboxing-the-qsw-1208-8c-qnap-10gbe-switch-its-finally-here/ https://nascompares.com/2018/04/12/unboxing-the-qsw-1208-8c-...

Ao7bei3s 7y ago
I agree MM is more widespread, but I thought we were talking about new cabling (and I took that to include the transceivers). (Serial over fiber? Nice, didn't know that existed.) Pricing-wise, what I meant is: $18: 10G-SR (MM): https://www.fs.com/products/11552.html https://www.fs.com/products/11552.html $24: 10G-LR (SM): https://www.fs.com/products/11555.html https://www.fs.com/products/11555.html Compared to the cost of actually running the fiber through the building, that's not too bad for trunks. As I said, I don't mind multi-mode for the last hop, which is where price is a larger concern due to quantity. And in organizations where OEM pricing is used as baseline, relative to that a resourceful admin can go to single mode and still come out ahead (it's not a fair comparison, but reality in some places). Sure, things are probably different in an actual DC. Direct attach is certainly cheaper (at first), but it can be a hassle compat wise, and I've never had quite the right length available. I can't speak to cooling, that's never been my department.
- angry_octet 7y ago
  Wow those SR SFP prices have fallen. Every SFP adds about 1W, but 10Gb-T ports are particularly thirsty, they were 5W when first introduced, still in that ballpark. It all adds up. Another reason to prefer fiber/DA is 10Gb-T has shit latency, it has a modem doing QAM, hence the power consumption. Probably only relevant for HPC or HFT, but just inelegant.

Ao7bei3s 7y ago

I agree MM is more widespread, but I thought we were talking about new cabling (and I took that to include the transceivers). (Serial over fiber? Nice, didn't know that existed.) Pricing-wise, what I meant is: $18: 10G-SR (MM): https://www.fs.com/products/11552.html https://www.fs.com/products/11552.html $24: 10G-LR (SM): https://www.fs.com/products/11555.html https://www.fs.com/products/11555.html Compared to the cost of actually running the fiber through the building, that's not too bad for trunks. As I said, I don't mind multi-mode for the last hop, which is where price is a larger concern due to quantity. And in organizations where OEM pricing is used as baseline, relative to that a resourceful admin can go to single mode and still come out ahead (it's not a fair comparison, but reality in some places). Sure, things are probably different in an actual DC. Direct attach is certainly cheaper (at first), but it can be a hassle compat wise, and I've never had quite the right length available. I can't speak to cooling, that's never been my department.

angry_octet 7y ago
Wow those SR SFP prices have fallen. Every SFP adds about 1W, but 10Gb-T ports are particularly thirsty, they were 5W when first introduced, still in that ballpark. It all adds up. Another reason to prefer fiber/DA is 10Gb-T has shit latency, it has a modem doing QAM, hence the power consumption. Probably only relevant for HPC or HFT, but just inelegant.