JPS625747A - Time division multiplexing device - Google Patents

Abstract

PURPOSE:To prevent the reduction of the channel number of data accomodation by converting an automatic calling signal receiving at a network control channel part to a start stop signal and transmitting it in series. CONSTITUTION:A parallel/series conversion means 1 which receives plural kinds of parallel automatic calling signals from terminal equipments, etc. or a network control equipment and converts these signals to serial start stop signals with adding a start bit and a stop bit on them, is provided at a transmission side. At a reception side, a serial/parallel conversion means 6 which converts the serial start stop signal to parallel one is provided and the start bit is detected from the separated data of the received serial start stop signal and by the time when the stop bit is detected from the detecting time of the start bit, the received serial start stop signal is converted to the parallel one by the serial/parallel conversion means 6 and after that, the automatic calling signal is regenerated through a parallel register 7.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a time division multiplexing device that performs bit-by-bit multiplexing, and in particular, to a time division multiplexing device that performs bit-by-bit multiplexing. The present invention relates to a time division multiplexing device that multiplexes network control signals and data signals communicated between networks on the same line.

[Conventional technology]

A network control device connected to this type of time division multiplexing device is a device necessary to connect a center device or a terminal device (hereinafter simply referred to as a terminal device, etc.) to a public line, and When making automatic calls, a network control device with an automatic call function is required.

Each is connected to a terminal device, etc. Furthermore, for the purpose of reducing communication costs, a time division multiplexing device may be used in the data communication line, and in this case, the network control device is installed in a remote location away from the terminal devices and the like.

FIG. 3 shows a connection example of a data communication system according to such a conventional technique. In this figure, 8 is a communication control device in the center device located at location A, and 9 is a time division multiplexing device. In addition, 10 is a time division multiplexing device installed at location B, 13 is a public line modem, and 14 is the public line 10.
Connected to 2.

This is a network control device equipped with an automatic calling function. Each time division multiplexer 9 and 10 is connected to a high speed line 101 via modems 11 and 12. Data signal a from communication control device 8 and data signal C from public line modem 13 are guided to data channel sections 15 and 17 in time division multiplexers 9 and 10, respectively, and are sent together with data signals from other channels. The signals are multiplexed and transmitted to the time division multiplexing device on the opposing side.

On the other hand, the automatic calling signal d of the network control device 14 is as follows.

It is processed by the network control channel unit 18 in the time division multiplexer 10 and the network control channel unit 16 in the time division multiplexer 9. As an automatic call signal.

It is necessary to handle 11 types of signals specified as the JISC6361200 series, and these signals are
The uke is passed as shown in the figure. In FIG. 4, 8 is a communication control device, 16 and 18 are network control channel units in the time division multiplexing device, and 14 is a network control device, (a) is the A ground side in FIG. 3, (b) is the B corresponds to the ground side. In this case, the two-time division multiplexer uses six types of signals (CRQ,
DPR, DSL, DS2, DS4.

DS8), and in a time division multiplexer that multiplexes bit by bit, it is necessary to allocate one time slot for each automatic paging signal, which reduces the number of data channels that can be accommodated or This has disadvantages, such as an increase in the number of interface signal lines between the terminal and the common section.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to convert the automatic paging signal received in the network control channel unit into a start-stop signal and transmit it serially, thereby converting the time slot that cannot be multiplexed into one time slot. It is an object of the present invention to provide a time division multiplexing device that can transmit many types of signals simply by lot allocation, thereby preventing a decrease in the number of data accommodating channels.

[Failure to solve the problem]

The present invention provides a time division multiplexing device that performs bit-by-bit multiplexing, in which a transmitting side receives multiple types of parallel automatic paging signals from a terminal device, etc. or a network control device, and a start bit and a stop bit are added to these signals. Parallel-to-serial conversion means for converting the serial start-stop signal into a serial start-stop signal is provided on the receiving side. Detecting a start bit from inside, converting the received serial start-stop signal into parallel by the serial-to-parallel converting means from the time of detection until the stop bit is detected, and then reproducing the automatic calling signal via the parallel reno star. It is characterized by being made to do.

[Embodiments of the invention]

Next, two embodiments of the present invention will be given and explained with reference to two drawings.

FIG. 1 is a block diagram showing the configuration of a network control channel unit in a time division multiplexer as an embodiment of the present invention. Figure (a) corresponds to the transmitter.

The automatic paging signal from a terminal device, etc. or a network control device is converted by the parallel-to-serial converter 1 into an asynchronous signal in which the data part is 6 bits plus a start bit (ST) and a stop bit (SP). , multiplexing from the multiplexing section.
The signals are read out bit by bit and sent to the multiplexer. An example of the bit arrangement of the start-stop signal at this time is shown below.
It will look like Figure 2. In this arrangement, CRQ/1
) The two types of signal names such as LO are shown because the time division multiplexing equipment connected to the terminal equipment (side a in Figure 4) uses the rcRQJ signal, and the time division multiplexing equipment connected to the terminal equipment etc. time division multiplexer on the side that is connected (side b in Figure 4)
means that the rDLOJ signals are multiplexed.

On the other hand, FIG. 1(b) corresponds to the receiving section, and the start-stop signal separated by the two separation sections is applied as separated data to the network control channel section together with the separated pulses.

The start signal detection circuit 2 sets the flip-flop 30 when a start signal is detected in the separated data. When the flinopfloc f3 is set, the clearing of the counter 4 is canceled and, at the same time, the AND gate 5 is opened to provide a separation signal to the counter 4 and the serial/parallel conversion circuit 6. Thereafter, serial-to-parallel conversion and incrementing of the counter are performed up to the position b6 in FIG. 2, and the counter 4 expires at the position of the first stop bit (SP). At the same time that the flip-flop 3 is reset by this full count signal, the parallel-converted automatic calling signal is transferred to the parallel register 7 and then sent to a terminal device or the like or a network control device.

In the above embodiment, the start-stop signal after being converted by the parallel-to-serial conversion circuit has a 6-bit configuration, but a parity check bit is further added to make it a 7-bit configuration.
More reliable transmission of signals is possible by detecting errors in identification by parity checking.

Also, regarding the bit arrangement of the start-stop signal.

It is not necessarily necessary to use the same bit arrangement as in FIG. 2, and the order of each bit may be changed.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, automatic paging signals in network control signals are converted into start-stop signals and transmitted in series.

By allocating only one time slot for multiplexing, it is possible to transmit many types of paging signals. This prevents a decrease in the number of data channels that can be accommodated. The effect is significant in that it improves efficiency and economic efficiency.

[Brief explanation of drawings]

1(a) and 1(b) are block diagrams showing the configurations of the transmitting side and receiving side, respectively, of the network control channel section in a time division multiplexing apparatus as an embodiment of the present invention, and FIG. A diagram showing a configuration example of a start-stop signal applied to the embodiment, FIG. 3 is a configuration example of a data communication system according to the prior art connected to a public telephone line, and FIG. FIG. 3 is a diagram illustrating an example of connection of automatic calling signals. In the figure, 1 is a parallel/serial conversion circuit, 2 is a start bit detection circuit, 3 is a flip-flop, 4 is a counter, 5 is a current date, and 6 is a serial/parallel conversion circuit. 7 is a parallel register, 8 is a communication control device, 9.10 is a time division multiplexer, 11.12 is a high-speed line modem, 13 is a public line modem, and 14 is a network control device. 15.17 is a data channel section, and 16.18 is a network control channel section. (α) (b) Figure 1 Figure 2 (Q) Figure 4 (b)

Claims (1)

[Claims] 1. In a time division multiplexing device that performs bit-by-bit multiplexing, the transmitting side receives multiple types of parallel automatic call signals from terminal equipment, etc. or network control equipment, and adds start bits and stop bits to these signals. Parallel-to-serial conversion means for converting the serial start-stop signal into a serial start-stop signal is provided, and a serial-to-parallel conversion means for converting the serial start-stop signal into parallel is provided on the receiving side to convert the received serial start-stop signal into separated data. Detecting a start bit, converting the received serial start-stop signal into parallel by the serial/parallel converting means from the time of detection until the stop bit is detected, and then reproducing the automatic calling signal via a parallel register. A time division multiplexing device characterized by: