Data signaling rate

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

Notes:

  1. The DSR is usually expressed in bits per second.
  2. 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, ni is the number of significant conditions of the modulation in the i-th channel, and Ti is the unit interval, expressed in seconds, for the i-th channel.
  3. 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.
  4. 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.
  5. The DSR may be expressed in bauds, in which case, the factor log2ni in the above summation formula should be deleted when calculating bauds.
  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 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.

Based upon Federal Standard 1037C.

Transmission Data Rate Terminology:

Data Rate Abbreviation Lower Upper
Extremely Low Data Rate ELDR 300 bps 3 kbps
Very Low Data Rate VLDR 3 kbps 30 kbps
Low Data Rate LDR 30 kbps 300 kbps
Medium Data Rate MDR 300 kbps 3 Mbps
High Data Rate HDR 3 Mbps 30 Mbps
Very High Data Rate VHDR 30 Mbps 300 Mbps
Ultra High Data Rate UHDR 300 Mbps 3 Gbps
Super High Data Rate SHDR 3 Gbps 30 Gbps
Extremely High Data Rate EHDR 30 Gbps 300 Gbps

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

See also: bit rate, transfer rate.

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