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Equation 11 · Part 1 · How AI Datacenter Interconnects Actually Work

Symbol R_line

Rline=2 RbaudR_{\mathrm{line}} = 2\,R_{\mathrm{baud}}
RlineR_{\mathrm{line}}

What this part means

RlR_line is part of the quantity the equation computes from the expression on the right.

Its job in the formula

RlR_line is part of the quantity the equation computes from the expression on the right.

The passage around this formula

…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 RbaudR_{\mathrm{baud}} for the symbol rate and RlineR_{\mathrm{line}} for the resulting line rate, Rline=2 RbaudR_{\mathrm{line}} = 2\,R_{\mathrm{baud}}. 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…

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A subscript is a label attached below a symbol. It often selects a time step, component, category, or member of a sequence.

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Sources cited in the surrounding passage

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