Tuesday, 2019-03-26

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felix_just had a brief look at the coaxpress standard and it seemes like a saner version of sdi15:39
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Kjetilinjecting 13Ws of power into the cable sounds like fun22:02
KjetilI do have a strong suspision that the bitrates on wikipedia are without subtracting the 8/10 overhead22:04
Kjetilinteresting enough the company that made the coaxpress chipsets were procured by microchip and their chipsets support SDI as well22:12
Bertlwell, bitrate typically refers to the on-wire data22:14
Bertle.g. SATA 6G is also 6G on the coded data not on the payload22:14
Kjetilsame thing with PCIe22:14
Kjetilwhich is kind of.. silly22:15
Bertldepends on the perspective ... for layer 0 it makes perfect sense, for IT, it doesn't :)22:15
Kjetilwhatever bandwidth needed to make the link work isn't really of that much importance when looking at the capabilities of a technology22:16
BertlI'm more annoyed by the disk sizes which are 'calculated' base 10 for marketing reasons :)22:16
Kjetilheh ;)22:16
KjetilAnd now they are 10+TB :/22:17
Bertland if you buy a 12TB disk, you can even store 10TB of data on it :)22:18
Bertlbut I'm curious, where do you draw the line regarding overhead?22:19
KjetilI guess it's kind of hard when you get into packetized formats22:19
Bertli.e. is the 'pre-encoded' data the payload?22:19
Bertlor like on gigabit ethernet where you have to consider the packet size overhead22:20
Bertlor even further when you use TCP and you get all the additional overhead :)22:20
Bertlbut I agree, it is confusing to mix them22:21
KjetilEspecially with variable length packet-based interconnects. Because the payload bandwidth is so depedent on the payload lengths22:22
Bertlyup, USB bandwidth calculations are fun :)22:23
Kjetilusb.. my nemensis22:23
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