Data rates

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.

Maximum rate

The maximum user signaling rate, synonymous to gross bitrate or data signaling rate, is the maximum rate, in bits per second, at which binary information can be transferred in a given direction between users over the telecommunications system facilities dedicated to a particular information transfer transaction, under conditions of continuous transmission and no overhead information.

For a single channel, the signaling rate is given by , where SCSR is the single-channel signaling rate in bits per second, T is the minimum time interval in seconds for which each level must be maintained, and n is the number of significant conditions of modulation of the channel.

In the case where an individual end-to-end telecommunications service is provided by parallel channels, the parallel-channel signaling rate is given by , where PCSR is the total signaling rate for m channels, m is the number of parallel channels, Ti is the minimum interval between significant instants for the I-th channel, and ni is the number of significant conditions of modulation for the I-th channel.

In the case where an end-to-end telecommunications service is provided by tandem channels, the end-to-end signaling rate is the lowest signaling rate among the component channels.

Transmission Data Rate Terminology

Data Rate Abbreviation Lower Upper
Extremely Low Data Rate ELDR 3 bit/s 30 bit/s
Super Low Data Rate SLDR 30 bit/s 300 bit/s
Ultra Low Data Rate ULDR 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 Mbit/s OC-3
622 Mbit/s OC-12
1063 Mbit/s Fibre Channel
1250 Mbit/s GbE
2125 Mbit/s 2xFibre Channel
2488 Mbit/s OC-48
2500 Mbit/s 2xGbE, infiniband
2666 Mbit/s OC-48(FEC)
3125 Mbit/s 10 DbE LX-4
4250 Mbit/s 4xFibre Channel
9.953 Gbit/s OC-192
10.3125 Gbit/s 10 GbE
10.51875 Gbit/s 10 G Fibre Channel
10.664 Gbit/s OC-192 (FEC)
10.709 Gbit/s OC-192 (ITU-T G.709)
11.100 Gbit/s 10 GbE FEC
11.300 Gbit/s 10 G Fibre Channel

See also


 This article incorporates "Federal Standard 1037C".

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