# data signaling rate (DSR)

**data signaling rate (DSR):** The aggregate rate at which data pass a point in the transmission path of a data transmission system. *Note 1:* The DSR is usually expressed in bits per second. *Note 2:* The data signaling rate is given by where *m* is the number of parallel channels, *n*_{i} is the number of significant conditions of the modulation in the *I*-th channel, and *T*_{i} is the unit interval, expressed in seconds, for the *I*-th channel. *Note 3:* 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* . *Note 4:* 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* . *Note 5:* The DSR may be expressed in bauds, in which case, the factor log_{2}*n*_{i} in the above summation formula should be deleted when calculating bauds. *Note 6:* 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 b/s 4-phase sending modem, the signaling rate is 2400 b/s on the serial input side, but the modulation rate is only 1200 bauds on the 4-phase output side.

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