|
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 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. #For serial transmission in a single channel, the DSR reduces to (1/''T'')log2''n''; 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 baud #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. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Data signaling rate」の詳細全文を読む スポンサード リンク
|