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It's like a multi-SIM phone, taken to the next level. Seeing this comment recently about ultra-cheap 4G LTE modems, I do wonder if one could make something cheaper with a bunch of those connected to a PC: https://news.ycombinator.com/item?id=45250676

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The device is probably 256 of those, or similar, chipsets on a board with integrated SIM slots and connectors for SMA antennas. You'd have a hard time producing something like this cheaper than China.

There's only 64 antennas but 256 SIMs, so there are either 64 separate quad-SIM modems (AFAIK only Mediatek made those, and in 2G only) or it's just one big FPGA, managed by a small CPU and connected to a bunch of RF ICs, like the inverse of a base station.

Or there are 64 modems that can switch between 4 SIM slots.

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