Are these the ones that are used do you know? Six mentioned here.
In the Australian Securities Exchange's Sydney data room, which is about the size of a big lounge room, there are six "cuckoos". These are the banks of servers installed by high-frequency traders.
They sit against the wall opposite the ASX servers and each is connected directly into the host by a fat fibre optic pipe. Each cable is precisely the same length by agreement with the ASX so that none gets an advantage; if one server is closer to the input, its cable is looped around to lengthen it.
Think about that: one less metre of optic fibre carrying data at 299.8 million metres per second - that is, the speed of light - would give one share trader an unfair advantage over the rest. It suggests that something pretty quick is going on.
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