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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 Ith channel, and T_{i} is the unit interval, expressed in seconds, for the Ith channel. Note 3: For serial transmission in a single channel, the DSR reduces to (1/T)log_{2}n; with a twocondition 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 twocondition 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 fourphase 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 4phase sending modem, the signaling rate is 2400 b/s on the serial input side, but the modulation rate is only 1200 bauds on the 4phase output side.


