Editing Data signaling rate (section)

== Maximum rate ==

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

For a single channel, the [[signaling rate]] is given by <math>SCSR = \frac{\log_2{n} }{T}</math>, 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 <math>PCSR = \sum_{i = 1}^{m} \frac{\log_2 {n_i} }{T_i}</math>, where ''PCSR'' is the total [[signaling rate]] for ''m'' channels, ''m'' is the number of parallel channels, ''T<sub>i</sub>'' is the minimum interval between significant instants for the ''I''-th channel, and ''n<sub>i</sub>'' 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.