Minipack2 is a 4U modular switch developed by Meta and manufactured by Celestica.1
As shown in the image above2, it has eight Port Interface Modules (PIMs), and each PIM has:
- 512x 50G PAM4 serdes lanes through a Tomahawk 4 ASIC
- 16x QSFP56 200G ports or 8x QSFP-DD 400G ports
This provided a total of up to 128x 200G or 64x 400G ports.
Minipack2 was released as an OCP specification, and its configuration is detailed extensively in [Minipack2 Generic OCP spec]2.