JPS6170836A - Connection system of asynchronous different speed terminal device - Google Patents

Abstract

PURPOSE:To attain data communication between different speed terminal devices by matching data transfer speeds between different speed data terminal devices and allowing a high-speed terminal device to stop the transmission of the next data temporarily until the low-speed terminal devices completes the reception. CONSTITUTION:Data from a high-speed data terminal device 1A is received by a data terminal side data transmission circuit TS of a data terminal device 2A, the speed is converted into the line speed of a time division electronic exchange 3 and transmitted to a low-speed data terminal device 1B via the exchange 3 by an exchange side data transmission circuit ES. Then transmission and reception data are exchanged in the exchange 3, the data from the exchange 3 is received by an exchange data reception circuit ER of the data terminal device 2B and transmitted to the speed of the terminal device 1B by the data terminal side data reception circuit TR. The terminal device 1A stops the transmission of next data temporarily until the reception of the terminal device 1B is finished.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a terminal connection system for performing data communication between data terminals using a time division electronic exchange, and particularly relates to a connection system for asynchronous different speed terminals.

[Background of the invention]

The conventional terminal connection method for data communication between data terminals using a time division electronic exchange is a connection method between same-speed terminals, and there is no specific connection method between asynchronous different-speed terminals, and currently there are various methods. It is currently under consideration.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a connection method for asynchronous different speed terminals that connects the asynchronous different speed terminals to a time division electronic exchange and enables data communication between the terminals.

[Summary of the invention]

In order to enable data communication by connecting asynchronous different speed terminals to a time division electronic exchange, the present invention requires matching of data transfer speeds between different speed data terminals and line speed between the data terminals and the time division electronic exchange. Focusing on the need to achieve consistency between high-speed and low-speed terminals and to enable low-speed terminals to receive data from high-speed terminals without causing underrun, data transfer between high-speed and low-speed terminals is adjusted to the line speed of the exchange. By matching the speeds, data transfer speeds are unified, and the high-speed terminal temporarily stops sending the next data until the low-speed terminal finishes receiving data, thereby temporarily creating an interval between data transmissions of the high-speed terminal. This is a connection method for asynchronous, different speed terminals that enables data communication by connecting the asynchronous, different speed terminals to a time-sharing electronic exchange.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

FIG. 1 is a system configuration diagram showing an embodiment of a close reading method for an asynchronous different speed terminal that performs data communication via a time division electronic exchange according to the present invention. In FIG. 1, IA,
IB are data terminals on the high-speed side and low-speed side, 2A, 2, respectively.
B is a data terminal side device (interface device), and 3 is a time division electronic exchange including an exchange side device (interface device).

With this configuration, data from one high-speed data terminal is received by the data terminal-side data transmission circuits TS of two data terminal-side devices at the speed of the data terminal, and is received by the time-sharing electronic exchange 3.
is converted to the line speed of ms, and the data transmission circuit on the exchange side ms
The data is sent to the other party's low-speed data terminal 1B via the time division electronic exchange 3. Then, the transmitted data and the received data are mixed up in the time division electronic exchange 3, and the data from the time division electronic exchange 5 is received by the exchange side data reception circuit HR of the data terminal side device 2B, and the data is received by the data terminal side data reception circuit TH. The data is corrected to the speed of the low-speed data terminal 1B and sent to the data terminal.

FIG. 2 is an explanatory diagram illustrating the call setting procedure until the data terminals in FIG. 1 mutually determine the data communication speed.

In Figure 2, a call is made from one data terminal, a selection signal can be sent from exchange 3, a selection signal is sent from one data terminal, ringing tone and ringing from exchange 3, a response from data terminal 1B, and exchange 3 The procedure up to the sending of each communication-enabled signal to both terminals is the procedure of a normal exchange connection. Then, after sending this signal indicating that communication is possible, from one data terminal.

In order to determine the data communication speed between the data terminals, a speed inquiry is made, and after the speed/speed response from the data terminal 1B, a speed setting procedure is added.

After this speed setting, data communication is performed between the data terminals.

FIG. 3 is a sequence diagram of control lines with a data terminal showing the l11m procedure of a data terminal equipped with an R32320 interface that performs the call setting procedure of FIG. 2.

FIG. 4 is a sequence diagram of a control system for temporarily stopping data transmission from the high-speed data terminal in FIG. In Figure 3, Data Set Ready DR and Equipment Ready ER are signals (lines) that are turned on when the data terminal and exchange are in a state where the call setup procedure is possible, and data transmission is not possible in this state. When there is a request, the data terminal turns on the transmission request signal R8.

Next, when the carrier detection signal OD indicating the setting of a communication channel is turned on, it means that data transmission is possible thereafter. However, according to the present invention, in FIG. 4, after receiving only one byte of transmission data SD from one high-speed data terminal at the speed of that data terminal, the received data is transferred to the time-sharing electronic exchanger 3.
control signal (II) O8 is turned off until transmission is completed to match the speed of the low-speed data terminal 1B, and transmission of the next data from one high-speed data terminal is temporarily stopped. At the same time, the transmission data SD is sent to the low-speed data terminal 1B as reception data RD obtained by converting the speed of the transmission data SD.

5Ig1 is a circuit block diagram showing an embodiment of the data terminal side device 2A (2, B) that performs the control shown in FIGS. 2 to 4 of FIG. 1. In FIG. 5, 4 is a data terminal IA (IB) corresponding to the data terminal side data transmitting circuit TS and data terminal side data receiving circuit TH of FIG.
The data terminal side data transmitting/receiving circuit that transmits and receives data to and from the data terminal side, 5 includes the exchange side data transmitting circuit Eq Matsukami r shown in Fig. A data transmitting/receiving circuit on the exchange side transmits and receives data to and from the exchange 3, and 6 indicates the data rate on the data terminal side and the data rate on the exchange side.

It has a circuit function to match the speed (line speed), a control circuit function to exchange control signals with the data terminal, and a circuit function to set the low data transfer rate of the data terminal. a control microcomputer that converts the data into a speed of This is an instruction decoder that decodes the instructions of the micro combinator 6 to be controlled. Note that E related to the microcomputer 6 is enable (synchronization signal), and A
is address signal, RIW is read/write signal, VMA
are each signal line of valid memory access indicating that a valid address is placed on the address signal line, D is data input, Q is output, OI+R is clear, OLK related to the transmit enable signal control circuit (flip-flop) 7. is the clock.

With this configuration, the micro combiator 6 issues a command to the decoder 8 to read the internal state of the data terminal side data transmitting/receiving circuit 4, so that the data terminal side data transmitting/receiving circuit 4 transmits data from one high-speed side data terminal. It constantly monitors whether the request signal R8, transmission data SD, etc. have been received. In this state, the microcomputer 6
By detecting the reception of the transmission request signal R5, the transmitting enable signal control circuit (7 lip-flops) 7 is sent to the decoder 8.
The transmission permission signal control circuit 7 issues a command to set a control signal (
line) O8, and also issues a command to the data terminal side data transmitting/receiving circuit 4 to transmit a carrier detection signal OD indicating the setting of a communication path.

By receiving these signals, one data terminal can
The transmission data SD is sent to the transmission data SD and II. When the data terminal side data transmitting/receiving circuit 4 receives only one byte of this transmission data SD, upon detecting this, the micro combiator 6 issues a command to the decoder 8 to clear the transmission enable signal control circuit 7, thereby permitting data transmission. ii control signal <m> o s indicating , is turned off, thereby temporarily stopping the transmission of the next transmission data SD.

By performing this processing, it is not necessary to receive new transmission data until the data terminal side data transmission/reception circuit 4 converts the speed of the received 1-byte transmission data SD and sends it to the exchange side. Next, the microcomputer 6 reads out the transmission data SD received by the data terminal side data transmitting/receiving circuit 4, and then issues a command to write the data to the exchange side data transmitting/receiving circuit 5 to the decoder 8, thereby writing the data to the low speed side data terminal 1B. Receive the data at the line speed of exchange 1iIA3 that matches the speed
D, the data is read out by the exchange side data transmitting/receiving circuit 5 and transmitted to the exchange side. The microcomputer 6 constantly monitors whether or not the exchange side data transmitting/receiving circuit 5 has finished transmitting the received data RD, similarly to the data terminal side data transmitting/receiving circuit 4, and when it detects the completion of transmitting the received data RD. A control signal (1s) O8 which turns on the send enable signal control circuit 7 via the decoder 8 to notify one data terminal of permission to send the next send data SD, and indicates permission to send the data.
Send out. This makes it possible for the high-speed data terminal 1A to send new transmission data SD.

Next, regarding the operation of the data terminal side device 2B on the receiving side, as in FIG. When it is detected that only one byte of the transmission data SD has been received, the data transmission/reception circuit 4 transmits the reception data RD at the speed of the low-speed data terminal 1B under the same control as the two data terminal devices on the transmission side.
, and sends the received data RD to the low-speed data terminal 1B.

As described above, according to the connection method using the data terminal side equipment of this embodiment, high-speed data processing is performed until the transmission data of the high-speed data terminal is converted to the speed of the low-speed data terminal and sent to the exchange side equipment. By temporarily stopping the transmission of the next data, it becomes possible for the low-speed data terminal to receive the received data without causing an underrun, thereby realizing the connection of asynchronous different-speed terminals [Invention] [Effect] As described above, according to the present invention, asynchronous different speed terminals can be connected to a time division electronic exchange and data communication can be performed. A local area network capable of data communication can be realized.

[Brief explanation of drawings]

FIG. 1 is a system configuration diagram showing an embodiment of a connection method for asynchronous different speed terminals that perform data communication via a time division electronic exchange according to the present invention, and FIG. 2 illustrates the call setting procedure of FIG. 1. Explanatory diagram, Figure 3 is a sequence diagram showing the control procedure of a terminal equipped with an RS 2320 interface that performs the call setup procedure in Figure 2, and Figure 4 is a sequence diagram showing the control procedure of a terminal equipped with an RS 2320 interface that performs the call setup procedure in Figure 2. FIG. 5 is a circuit block diagram showing an embodiment of a data terminal side system that performs the control shown in FIGS. 2 to 4 of FIG. 1. IA, IB...Data terminal, 2A, 2B...Data terminal side equipment, 3...Time division electronic exchange, 4...Data terminal side data transmission/reception circuit, 5...Exchange 411I side device 6...Micro combiator 1 7...Transmission enable signal control circuit, 8...Instruction decoder. -・,,'' Representative Patent Attorney Akio Takahashi Figure 1 Figure 2 Figure 3 Figure S as Figure ＋

Claims (1)

[Claims] In a system that performs data communication by connecting asynchronous different speed terminals to a time division electronic exchange including exchange side equipment via a terminal side device, the terminal side device has a circuit for transmitting and receiving data to and from the terminal, and a circuit for transmitting and receiving data between the exchange and the data exchanger. A circuit for transmitting and receiving data, a means for matching the data rate on the terminal side and a data rate on the exchange side, a means for exchanging control signals with the terminal, and a means for setting the data rate of the terminal are provided, and the data of the high-speed terminal is matched with the data rate of the low-speed terminal. A connection method for asynchronous different-speed terminals in which the high-speed terminal temporarily stops sending the next data until it is converted to data speed and sent to the exchange equipment.