JPH04256254A - Data transmission system in isdn - Google Patents

Abstract

PURPOSE:To improve the transmission efficiency and to attain economy by distributing a digital signal having a transmission speed whose speed is more than the transmission speed of an information channel to plural information channels and sending the result. CONSTITUTION:An output of a random bit pattern generating circuit 13 is sent to information channels 31, 32 to measure a transmission delay time of an information channel prior to data transmission. A delay time measurement circuit 23 receives a data via reception data delay circuits 26, 27 and a reception data changeover circuit 25 to set a delay time correction value. A receiver side control circuit 24 sends measurement end information to a sender side control circuit 14 and the sender side control circuit 14 controls a transmission data changeover circuit 15 to send an output of a transmission data distribution circuit 12 distributed to plural information channels to the information channels 31, 32. The reception data changeover circuit 25 sends the reception data matched in a same phase by the reception data delay circuits 26, 27 to a reception data synthesis circuit 22, in which the data is composed sequentially for each prescribed length and a high speed input data is decoded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to data transmission in ISDN, and more particularly to a data transmission system for transmitting digital signals having a transmission rate higher than the transmission rate of an information channel using a plurality of information channels.

0002

[Background Art] Conventionally, in this type of data transmission, a line with a high-speed information channel is prepared to match the transmission speed of the data to be transmitted, or the data is compressed and expanded and then transmitted at the transmission speed of the information channel. I was supposed to.

0003

[Problems to be Solved by the Invention] In the conventional data transmission method described above, the method of preparing a line with a high-speed information channel according to the transmission speed of the data to be transmitted is difficult to achieve when the amount of data to be transmitted is small. However, there are disadvantages in that the usage efficiency of the transmission line is reduced and it is not economical. In addition, with the method of compressing and decompressing data to reduce the amount of data to the transmission speed of the information channel and transmitting it, depending on the data content, it may not be possible to compress it sufficiently, and therefore it may not be possible to transmit it at the transmission speed of the information channel. There is a drawback.

An object of the present invention is to provide a data transmission system in ISDN that uses a plurality of information channels to transmit digital signals at a transmission rate higher than the transmission rate of the information channel.

[0005]

[Means for Solving the Problems] A data transmission system in ISDN according to the present invention is a data transmission system in ISDN in which a transmission path consisting of a control channel and a plurality of information channels is connected to an ISDN network to transmit and receive digital signals. , a delay time measurement signal generator that generates a measurement signal for pre-measuring the transmission delay time of each of the plurality of information channels; and an input data signal having a higher data transmission rate than the data transmission rate of the information channel to the plurality of information channels. input data distribution means for distributing; transmission data selection means for selecting either the input data signal or the delay time measurement signal distributed by the input data distribution means and outputting the selected signal to a transmission path; receives delay time measurement completion information from the receiving section, controls the transmission data selection means, and distributes input data from the delay time measurement signals simultaneously sent to the plurality of information channels at the time of delay time measurement by the input data distribution means. a transmitter having a transmission control means for generating a switching control signal for switching to a data signal; and collating the delay time measurement signal sent by the transmitter to the plurality of information channels when measuring the delay time of the information channel. delay time measuring means for detecting the delay time difference between the information channels and generating a delay time correction signal for correcting the delay time difference between the information channels; reception data delay means for setting a correction value so that the error is eliminated, and reception data synthesis for reproducing the input data signal by sequentially assembling the reception data from the plurality of information channels received through the reception data delay means for each fixed length. means for selectively and selectively connecting the delay time measurement signal and the reception data received from the plurality of information channels via the reception data delay means to either the delay time measurement means or the reception data synthesis means; a switching means, after the completion of the delay time measurement, transmits delay time measurement completion information indicating completion of reception preparation to the transmitting section via the control channel, and controls the received data switching means; Instead of the delay time measurement signals from the plurality of information channels received through the reception data delay means connected to the delay time measurement means, the delay time measurement signals are distributed to the plurality of information channels transmitted from the transmission section. a receiving section having a receiving control means for generating a switching control signal for connecting received data to the received data synthesizing means, and a delay time measurement signal generator for generating a random bit pattern as the delay time measurement signal. has.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. The transmitter 1 divides the input digital signal into certain lengths,
A transmission data distribution circuit 12 that distributes data to multiple information channels 31 and 32, a random pattern generation circuit 13 that simultaneously transmits the same random bit pattern to multiple information channels 31 and 32, and information transmitted to information channels 31 and 32. a transmission data switching circuit 15 for switching whether to output from the transmission data distribution circuit 12 or from the random pattern generation circuit 13; and a control channel 3.
The transmitting side control circuit 14 transmits and receives control information to and from the receiving side control circuit 24 via 3 and 43 and controls the transmission data switching circuit 15.

[0008] The receiving unit 12 has a plurality of information channels 31,
Reception data delay circuit 2 that can freely set the amount of delay of reception data corresponding to the delay times of 32, 41, and 42.
6, 27 and a plurality of information channels 41, 42 from the transmitting section.
A delay function that compares the random bit patterns sent to the , calculates the delay time between each information channel, and sets the delay time to the received data delay circuits 26 and 27 so that the delay difference between the respective information channels is eliminated. A time measurement circuit 23 , a received data synthesis circuit 22 that sequentially assembles information from a plurality of information channels 41 and 42 every fixed length and reproduces an input digital signal, and sends data from the information channel 43 to the received data synthesis circuit 22 a received data switching circuit 25 that switches whether to send the received data to the delay time measuring circuit 23;
It is comprised of a transmitting side control circuit 14 via a control channel 33 and a receiving side control circuit 24 that transmits and receives control information and controls the received data switching circuit 25.

The transmission path 3 is composed of an information channel 31, an information channel 32, and a control channel 33, and is connected to an ISDN network 5.
connected to. The transmission path 4 to the receiving section 2 is composed of an information channel 41, an information channel 42, and a control channel 43, and is connected to the ISDN network 5.

[0010] In ISDN, in order to connect an information channel, call setup is performed using messages on a control channel. As a result, the information channel 31 of the transmitting side transmission line 3 and the information channel 41 of the receiving side transmission line 4 are connected via the ISDN network 5, and the information channel 32 of the transmitting side transmission line 3 and the information channel of the receiving side transmission line 4 are connected via the ISDN network 5. 42 is also connected via the ISDN network 5. At this time, the setting of the transmission path within the ISDN network is generally independent for each information channel, and as a result, the transmission delay time for each information channel has a different value.

When the connection of the information channel is completed, the transmission side control circuit 14 instructs the transmission data switching circuit 15 to transmit the output from the random pattern generation circuit 13 as the transmission data. As a result, the same random pattern is sent to the information channel 31 and the information channel 32, and further transmitted to the information channel 4 on the receiving side via the ISDN network 5.
1, transmitted to the information channel 42.

At this time, the receiving side control circuit 24 instructs the received data switching circuit 25 to send the data received from the information channel 41 and the information channel 42 to the delay time measuring circuit 23.

The delay time measuring circuit 23 is connected to the information channel 4.
1 and the data received from the information channel 42;
Measure how many bits of data is delayed in which channel. As a result, for example, if it is found that the information channel 42 has a larger delay by N bits, it issues an instruction to the received data delay circuit 26 of the information channel 41 to delay it by N bits. As a result, the data received by the information channel 41 and the information channel 42 remains in the same phase as the data sent to the information channel 31 and the information channel 32 by the transmitter side.

Next, the reception side control circuit 24 instructs the reception data switching circuit 25 to send the data received from the information channel 41 and the information channel 42 to the reception data synthesis circuit 22, and further instructs the reception data switching circuit 25 to send the data received from the information channel 41 and the information channel 42 to the reception data synthesis circuit 22. The completion of delay time measurement is sent as control information.

The transmission control circuit 14, which has received the control information indicating completion of the delay time measurement on the receiving side from the information channel 33, instructs the transmission data switching circuit 15 to use the output from the transmission data distribution circuit 12 as transmission data. do.

In this state, when the transmission data 100 shown in FIG.
2 is sent.

Data 103 and 104 that have reached the information channel 41 and the information channel 42 through the ISDN network 5 have a larger delay of N bits in the information channel 42, as shown in FIG. However, the reception data delay circuit 2
6 delays the data of the information channel 41 by N bits as shown at 105 in FIG. The data will be the same as the previous one.

The received data synthesis circuit 25 alternately extracts data from each of the information channels 41 and 42 at fixed length intervals, and outputs the data to the digital signal output terminal 21 at the same transmission speed as the input data, as shown at 107 in FIG. Output. As a result, data applied to the digital signal input terminal 11 is outputted to the digital signal output terminal 21 as is.

[0019]

Effects of the Invention As explained above, the present invention distributes and transmits a digital signal having a transmission speed higher than the transmission speed of an information channel to a plurality of information channels, thereby achieving high speed transmission in order to cope with high-speed data transmission. There is no need to prepare a transmission line with multiple information channels, thus improving transmission efficiency and being economical. Furthermore, there is no need to compress or expand data, and data can be transmitted at any transmission speed.

[Brief explanation of the drawing]

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

FIG. 2 is a diagram showing signals for operations of each part in the present embodiment.

[Explanation of symbols]

1 Transmitting section 2 Receiving section 3 Transmitting side transmission line 4 Receiving side transmission line 5 ISDN network 11 Digital signal input terminal 12 Transmitting data distribution circuit 13 Random pattern generation circuit 14 Transmitting side control circuit 15 Transmitting data switching circuit 22 Receive data synthesis circuit 23 Delay time measurement circuit 24 Receiving side control circuit 25 Received data switching circuit 26 Received data delay circuit 1 27 Received data delay circuit 2 31 Information channel 1 32 Information channel 2 33 Control channel 41 Information channel 42 Information channel 43 Control channel

Claims (2)

[Claims] Claim 1: In an ISDN data transmission system in which a transmission path consisting of a control channel and a plurality of information channels is connected to an ISDN network to transmit and receive digital signals, the transmission delay time of each of the plurality of information channels is measured in advance. a delay time measurement signal generator that generates a measurement signal for transmitting data; an input data distribution means that distributes an input data signal higher than the data transmission rate of the information channel to the plurality of information channels; transmission data selection means for selecting either the distributed input data signal or the delay time measurement signal and outputting the selected one to a transmission path;
The input data distribution means receives delay time measurement completion information from the receiving section via the control channel, controls the transmission data selection means, and uses the delay time measurement signal sent simultaneously to the plurality of information channels at the time of delay time measurement. a transmitter having a transmission control means for generating a switching control signal for switching to an input data signal distributed by the input data signal; and a transmitter having a transmission control means for generating a switching control signal for switching to an input data signal distributed by the transmitter, and the delay transmitted by the transmitter to the plurality of information channels when measuring the delay time of the information channel. delay time measuring means for collating time measurement signals to detect a delay time difference between information channels and generating a delay time correction signal for correcting the delay time difference between the information channels; reception data delay means for setting a correction value so as to eliminate delay time differences among individual channels; and reception data from the plurality of information channels received through the reception data delay means are sequentially assembled for each fixed length to form the input data signal. Selecting the delay time measurement signal and the reception data received from the plurality of information channels via the reception data synthesis means to be reproduced and the reception data delay means to either the delay time measurement means or the reception data synthesis means. receiving data switching means to be switched and connected, and transmitting delay time measurement completion information indicating completion of reception preparation to the transmitter after completion of the delay time measurement via the control channel, and controlling the received data switching means; Instead of the delay time measurement signals from the plurality of information channels received via the reception data delay means connected to the delay time measurement means at the time of delay time measurement, a plurality of delay time measurement signals transmitted from the transmission section are used. The received data distributed to the information channels,
a receiving section having a receiving control means for generating a switching control signal for connection to the received data combining means, and distributing a digital signal having a transmission speed higher than the transmission speed of the information channel to a plurality of information channels. A data transmission method in ISDN characterized by transmission. 2. The data transmission system in ISDN according to claim 1, further comprising a delay time measurement signal generator that generates a random bit pattern as the delay time measurement signal.