JPH04192842A - Data transmission system - Google Patents

Abstract

PURPOSE:To correct the delay between channels in the subsequent data transmission phase, and to execute the data transmission at a speed of an integer multiple of a speed determined to a circuit by detecting a phase difference between prescribed channels at the time of calling, and absorbing the phase difference by the buffer control. CONSTITUTION:The system is constituted of a pattern generating circuit 1, an INS network circuit, two selecting circuits 2, a phase difference deciding circuit 3, and two buffer circuits 4. In such a state, a high speed data signal of a speed of N folds of a prescribed speed is divided into N and allocated and inputted to N circuits, a delay difference in a public transmission circuit network of the data signal is absorbed, and by this absorption, N pieces of signals whose phases coincide with each other are synthesized and an output signal corresponding to the high speed data signal is obtained. In such a way, a difference the delay quantity between channels is eliminated, and the data signal of a high speed can be transmitted by using plural circuits of a low speed channel.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data transmission system using a line network such as an INS net line, and particularly to a data transmission system when using a plurality of lines.

[Conventional technology] In data transmission systems using INS lines, etc.
The speed of each line is fixed.1Currently, the speed of the B channel (6
It is common to perform data transmission with a speed of 4k b/s). In reality, the number of lines contracted is often two or more. A special high-speed line is also prepared to perform data transmission at higher speeds than the above-mentioned 64, but this line cannot transmit low-speed B channels. Therefore, when a high-speed channel is used infrequently, it is naturally uneconomical.

[Problem to be solved by the invention] For this reason, when using multiple B channels,
If a data signal having a speed of 64kXN (N is an integer of 2 or more) can be transmitted by dividing it into B channels, the above-mentioned uneconomical problem should be solved.

However, in the (NB+D) line configured in this way,
Since the line connection is for each B channel, the amount of delay between B channels is different and can be combined.

Split transmission is not possible.

Therefore, the present invention aims to provide a system for transmitting high-speed data signals using a plurality of low-speed channels by ultimately eliminating the above-mentioned difference in the amount of delay between channels. [Means for Solving the Problems] According to the present invention, there is provided a system for transmitting data signals via a public common line network using a channel at a predetermined speed, the method comprising at least two lines (hereinafter referred to as N). In a data transmission method when a high-speed data signal having a speed N times the predetermined speed is divided into N parts and allocated to the N lines, the data signal is transmitted to the public line network. A data transmission system is obtained in which a delay difference is absorbed, and N signals having the same phase are synthesized by this absorption to obtain an output signal corresponding to the high-speed data signal.

Further, according to the present invention, in a data transmission method in which a data signal is transmitted via a public common line using a channel at a predetermined speed, when N lines can be used,
On the side that transmits the data signal, there is provided a pattern generation circuit that generates a pattern sequence, and a pattern generation circuit that is provided on the N line and that simultaneously selects the pattern sequence when one call is made and selects the de-signal during subsequent operations. and N selection circuits for output.

The pattern strings output from the N selection circuits are input to the data signal receiving side, the phase differences between the pattern strings are detected, and the subsequent N data signals are determined based on the detected phase difference. A data transmission system is obtained that is characterized by comprising a phase difference determination circuit that determines a delay difference, and a buffer circuit that absorbs the determined delay difference for each line.

Note that it is effective to make the period of the pattern sequence at least twice the maximum delay time of the public line network.

Examples] Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention.

A pattern generation circuit 1 generates a pattern sequence having a period at least twice the maximum delay time of the INS net line, and this pattern sequence is selected as an output signal by two selection circuits 2 when a calling line is connected.

This scheme in Figure 1 uses two B channels to
When transmitting a data signal of k b / s,
The aforementioned pattern sequence is sent out on two B channels.

On the other hand, at the partner station, the paired phase difference determination circuit 3 inputs the pattern sequence from the two B channels when receiving, and determines the delay difference ΔT between the B channels from the phase difference between the pattern sequences.

Figure 2 is a diagram showing an example of the above operation.
2 indicates two B channels, T indicates pattern rows P1 to P,
, and ΔT("BI B2) is the delay difference between both B channels. If the maximum delay time of the INS line is T, then as mentioned earlier, B, -8
2, that is, ΔT has the following relationship. The phase difference between the B and B2 channels can be determined by the polarity of this ΔT. In this example, B1 is delayed by 61 minutes from 82.

The results thus obtained by the pair of phase difference determination circuits 3 are input to the pair of buffer circuits 4, where the delay difference between the B channels is absorbed. Therefore, the phase difference between the outputs of the pair is B
Match across channels.

Note that the above explanation is based on the case where two B channels are used, but if the number of channels is not 2 but many more (
- Two or more N) may be present in the shell.

Although a channel with a speed of 64 kb/s was also used.

Channels of other speeds may also be used.

[Effects of the Invention] As explained above, the present invention detects, for example, the phase difference between B channels at the time of calling, and absorbs the phase difference by buffer control, thereby reducing the delay between B channels in the subsequent data transmission phase. Correction becomes possible, and data transmission at a speed that is an integral multiple of the speed determined for one line can be realized.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of an embodiment of the data transmission system of the present invention, and FIG. 2 is a diagram for explaining its operation. Explanation of symbols = 1...Pattern generation circuit, 2...Selection circuit, 3...Phase difference determination circuit, 4...Buffer circuit.

Claims (3)

[Claims] (1) A method of transmitting data signals via a public common line network using channels at a predetermined speed, the method comprising at least two (
In a data transmission method when a line (hereinafter referred to as N) is available, a high-speed data signal with a speed N times the predetermined speed is divided into N parts and allocated to the N lines, and the data signal is A data transmission system characterized in that a delay difference in the public line network is absorbed, and N signals having the same phase are synthesized by this absorption to obtain an output signal corresponding to the high-speed data signal. . (2) In a data transmission method in which a data signal is transmitted via a public common line using a channel at a predetermined speed, and when N lines can be used, the side transmitting the data signal has a pattern. a pattern generation circuit that generates a sequence, and N selection circuits that are provided on the N lines and simultaneously select the pattern sequence when a call is made, and select and output the data signal during a subsequent operation; The pattern strings output from the N selection circuits are input to the data signal receiving side, the phase difference between the pattern strings is detected, and the detected phase difference is used to select the following N data signals. A data transmission system comprising: a phase difference determination circuit that determines a delay difference; and a buffer circuit that absorbs the determined delay difference for each line. (3) The data transmission system according to claim (2), wherein the period of the pattern sequence is at least twice the maximum delay time of the public line network.