Equation 11 · Part 3 · How AI Datacenter Interconnects Actually Work
=
=
What this part means
The expressions on both sides represent the same quantity under the stated assumptions.
Its job in the formula
The equals sign connects the complete expression on the left with the complete expression on the right. Both sides must have compatible units.
Full expression→=→Article meaning
The passage around this formula
Modern high-rate Ethernet lanes use PAM4 modulation: instead of encoding one bit per symbol as ordinary NRZ signaling does, PAM4 uses four distinct voltage levels to encode two bits per symbol, so a lane’s bit rate runs at twice its baud (symbol) rate rather than matching it one for one. Writing for the symbol rate and for the resulting line rate, . which is exactly the relationship documented for real 400G optics: a 26.5625 Gbaud lane carries 53.125 Gb/s in an eight-lane configuration, and a 53.125 Gbaud lane carries 106.25 Gb/s in a four-lane configuration [ 8 ] . That doubling is not free. Four voltage levels packed into the same…
Learn the underlying idea
An equals sign says that the expression on its left and the expression on its right have the same value under the stated definitions and assumptions.
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Sources cited in the surrounding passage
These citations provide research context; check each source for the exact claim it supports.