Data signaling rate

Data signaling rate

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.


  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, according to Hartley's law.
  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.


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 1 Mbit/s is defined as 1,000,000 bits per second signal data rate (OSI Layer 1).

Data Rate and Standard

Data Rate Standard
155 Mb/s OC-3
622 Mb/s OC-12
1063 Mb/s Fibre Channel
1250 Mb/s GbE
2125 Mb/s 2xFibre Channel
2488 Mb/s OC-48
2500 Mb/s 2xGbE, infiniband
2666 Mb/s OC-48(FEC)
3125 Mb/s 10 DbE LX-4
4250 Mb/s 4xFibre Channel
9.953 Gb/s OC-192
10.3125 Gb/s 10 GbE
10.51875 Gb/s 10 G Fibre Channel
10.664 Gb/s OC-192 (FEC)
10.709 Gb/s OC-192 (ITU-T G.709)
11.100 Gb/s 10 GbE FEC
11.300 Gb/s 10 G Fibre Channel

See also


 This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C".

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