A ChatGPT Pro subscription costs 38.6 months of income in low-income countries (policykahani.substack.com)

Yes: "an advanced, low-power, high-performance mobile clock generator with four clock outputs. The device integrates a MEMS resonator, temperature sensor and a temperature-to-digital converter (TDC), which eliminates the need for external crystal and temperature-sensing crystal resonators." -- https://www.sitime.com/products/clock-generators/clock-gener...

bux93 · 2h ago

The paper mentions TCXOs and OCXOs, respectively temperature and oven-controlled crystal oscillator. You can get PCIe cards that have these on them, and devices for audio studios with a rubidium oscillator like the Tascam CG-1800.

Jane Street has a podcast that lifts the veil a little bit on how they keep their gear synced up, which is pretty interesting: https://signalsandthreads.com/clock-synchronization/

RossBencina · 27m ago

The CG-1800 uses "a high-precision OCXO (oven-controlled crystal oscillator)" https://tascam.com/us/product/cg-1800/ only mention of rubidium is: "An external input connector that supports a 10MHz signal enables the CG-1800 to be connected to a rubidium clock or GPS clock for even higher precision."

On the other hand, Antelope Audio 10MX is a rubidium word clock source: https://en.antelopeaudio.com/products/10mx/

Surplus rubidium frequency standards are cheap on Ebay: https://www.diyphysics.com/2012/02/14/d-i-y-10-mhz-atomic-cl...

RossBencina · 3h ago

From TFA: "Some commercial PTP implementations use packet delay variation (PDV) filters [27], and compensate for known latencies in the receive and transmit paths."

This is phrased vaguely. All gPTP implementations are required to compensate for link delay (not necessarily rx/tx asymmetry).

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