Data signaling rate

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

Notes:

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_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.
For serial transmission in a single channel, the DSR reduces to (1/T)log₂n; 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)log₂ 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 log₂n_i in the above summation formula should be deleted when calculating bauds.
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.

Transmission Data Rate Terminology:

Data Rate	Abbreviation	Lower	Upper
Extremely Low Data Rate	ELDR	300 bit/s	3 kbit/s
Very Low Data Rate	VLDR	3 kbit/s	30 kbit/s
Low Data Rate	LDR	30 kbit/s	300 kbit/s
Medium Data Rate	MDR	300 kbit/s	3 Mbit/s
High Data Rate	HDR	3 Mbit/s	30 Mbit/s
Very High Data Rate	VHDR	30 Mbit/s	300 Mbit/s
Ultra High Data Rate	UHDR	300 Mbit/s	3 Gbit/s
Super High Data Rate	SHDR	3 Gbit/s	30 Gbit/s
Extremely High Data Rate	EHDR	30 Gbit/s	300 Gbit/s

Based upon proposal from davisnetworks.com. 1 Mbit/s is defined as 1,000,000 bits per second signal data rate (OSI Layer 1).

[edit] See also