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jabbr

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  1. Posting these articles intermittently as the future of optical networking. This has **nothing** to do with home audio. Intel has previously demonstrated but looks like Broadcom has taken the lead in implementation. The metal DAC cables (direct QSFP to QSFP) and QSFP ports may go away to be replaced by optical to optical, presumably single mode fiber direct from chip to chip. I'd assume the fully optical chip could plug into a QSFP port on a remote device... Broadcom Now Sampling 51.2T Co-Packaged Optics Switch (servethehome.com)
  2. In the context of network devices (this subforum) a reclocker is simply a device, typically a switch but also an extender or FMC for which the output eye pattern is equal or tighter than the input eye pattern.
  3. Yes FMCs are simply very minimal switches with one copper RJ-45 and one SFP port. Using a switch with more ports is typically more cost effective.
  4. Solarflare only has drivers for server versions of Windows. They were not intended to be used on desktop machines. They were successfully marketed at the trading community for which trade execution speed is critical hence their low latency. So you couldn't find a driver for your Windows OS. X2 Series Ethernet Adapters (xilinx.com) It is true that lots of fiberoptic equipment isn't intended to be used in the client/desktop environment and there are consequently more incompatibilities than with desktop products which are more intended to be plug and play. This is the reason for this thread: to document what works with what. I have successfully used Solarflare NICs with Linux. I have found that a number of the server NICs of that generation ran hot and need good cooling. One of the advantages of the Intel fiberoptic NICs is that they list wattage and you can typically figure out how hot a card will get by the number of watts it uses.
  5. 1) Solarflare NICs are terrific, arguably the lowest latency 10G NICs as well as supporting the PTP if this can help. Now part of Xilinx -> AMD 2) passive DAC cables aren't fiberoptic, rather copper
  6. Hey @Jud I see you have a fiberoptic USB cable, what do you think?
  7. At this point all discussion of such noise has been theoretical and despite promises that "any day now" we are going to see data, after 10 years there hasn't been any -- for audio systems. Correct it can't be additive for high speed modern computers and networks. For 10G+ networks there has been masses of data and there are devices which measure this because its a big industry. Differential noise, whether ground plane, supply plane, or phase, isn't allowed to propagate through a 10G+ switch ie it isn't allowed to be additive and there need to be circuits which are designed explicitly so the noise isn't additive. At 100G, for example, even a tiny bit of noise can throw the system completely off. Its not just peer reviewed research, its by specification and design and compliance testing.
  8. Yeah **honestly** I couldn't predict how much input ethernet "jitter" effects SQ on the Lumin. It might not at all because buffers etc. There's been alot of hand wrangling to suggest that it might but in the decade that this has been debated and despite promises of tests etc I haven't seen an actual shred of evidence to say that the Lumin, to give a specific example, SQ is at all affected by input ethernet jitter. Now I've chosen to remove the possibility that it might be important by using 10g switches with a 1g output but really its theoretical and subjective reports which don't use modern highspeed fiberoptic ethernet (eg 10G and faster) It would be interesting to get something definitive from Lumin if they have any data...
  9. also we are talking about network switch jitter not DAC clock jitter which might actually be important! exactlty the Mikrotik 10g and 100g switches -- among others! -- are so cost effective why not? (I certaintly didn't pay $32k for my NVidia/Mellanox switch ... got it on eBay and a very nice Mellanox engineer helped my get it working!)
  10. Sure! and I'm saying that 1G was not designed/specified to block upstream jitter whereas 10G was explicitly designed that way...
  11. I'm unable to tell what someone else hears with their setup. People should listen to what they like. What I can do is suggest a system with low jitter and CMN rejection, 10G fiber does that by design. One segment of 10G will essentially eliminate upstream jitter so I don't see a final 1G hop to the endpoint as an issue from an engineering point of view. I have been using 10G-100G switches for awhile and have tested a bunch of NICs some designed for ultralow jitter ie better than plain 10G. I haven't been able to tell a difference swapping high speed fiber NICs at the server. I think I've documented my own trials on this thread but I've used a variety of NICs as well as switches from very well established vendors for example this: NVIDIA MSN2100-CB2F Spectrum 100GbE 1U Open Ethernet Switch ... I'm not suggesting that anyone need this for home audio just that personally I can't hear a SQ difference once jitter goes below some threshold.
  12. Many of my endpoints are still 1G so yeah I still have and use 1G SFP modules... my switches are all 10-100G
  13. Do what sounds best to you. There is no "proof" that the lower jitter of 10G has better SQ.
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