“Financial traders are now turning to high-speed laser networks between stock exchanges, to decrease latency by a few milliseconds, to squeeze a few more trillion dollars per year out of high-frequency trading (HFT). Perseus Telecom recently completed a microwave link between London and Frankfurt that reduced the round-trip latency to just 4.6 milliseconds — almost halving the 8.35-millisecond round-trip for the London-Frankfurt fiber link. The microwave network cost between $13 and $26 million to build, but for the financial trader who uses it could earn billions.”
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