# Data signaling rate

## Aggregate rate at which data pass a point in the transmission path of a data transmission system / From Wikipedia, the free encyclopedia

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In telecommunication, **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.

- The DSR is usually expressed in bits per second.
- The data signaling rate is given by $\sum _{i=1}^{m}{\frac {\log _{2}{n_{i}}}{T_{i}}}$ where
*m*is the number of parallel channels,*n*is the number of significant conditions of the modulation in the_{i}*i*-th channel, and*T*is the unit interval, expressed in seconds, for the_{i}*i*-th channel. - For serial transmission in a single channel, the DSR reduces to (1/
*T*)log_{2}*n*; with a two-condition modulation, i. e.*n*= 2, the DSR is 1/*T*, according to Hartley's law. - For parallel transmission with equal unit intervals and equal numbers of significant conditions on each channel, the DSR is (
*m*/*T*)log_{2}*n*; in the case of a two-condition modulation, this reduces to*m*/*T*. - The DSR may be expressed in bauds, in which case, the factor log
_{2}*n*in the above summation formula should be deleted when calculating bauds._{i} - In synchronous binary signaling, the DSR in bits per second may be numerically the same as the modulation rate expressed in bauds. Signal processors, such as four-phase modems, cannot change the DSR, but the modulation rate depends on the line modulation scheme, in accordance with Note 4. For example, in a 2400 bit/s 4-phase sending modem, the signaling rate is 2400 bit/s on the serial input side, but the modulation rate is only 1200 bauds on the 4-phase output side.

Aggregate rate at which data pass a point in the transmission path of a data transmission system