Gross bit rate in the context of "Symbol rate"

In telecommunications, data signaling rate (DSR), also known as gross bit rate, is the aggregate rate at which data passes a point in the transmission path of a data transmission system.

In telecommunication and information theory, the code rate (or information rate) of a forward error correction code is the proportion of the data-stream that is useful (non-redundant). That is, if the code rate is ${\displaystyle k/n}$ for every k bits of useful information, the coder generates a total of n bits of data, of which ${\displaystyle n-k}$ are redundant.

If R is the gross bit rate or data signalling rate (inclusive of redundant error coding), the net bit rate (the useful bit rate exclusive of error correction codes) is ${\displaystyle \leq R\cdot k/n}$.