JPH04247747A - Terminal adaptor - Google Patents

Abstract

PURPOSE:To utilize high speed data communication for an ISDN even when a terminal equipment inputs or outputs a low speed data by storing a transmission reception data once and converting the speed of the data to a data processing terminal equipment to an optional speed. CONSTITUTION:Data sent from a network and a terminal equipment are stored respectively to reception and transmission storage means 103,1 04. Then timing information of a call/interrupt means 105 decided by a transmission data quantity and a talking time is sent to a network control section 106. The control section 106 implements call control based on the timing information and control information from an interface 110 and a data output means of the interface 110 outputs a reception storage data to a terminal equipment at an optional speed. Moreover, a data input means of the interface 110 receives a data from the terminal equipment at an optional speed and separates the data into a transmission data and a control data. Thus, even a low speed input output data terminal equipment can utilize ISDN high speed data communication.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal adapter for connecting data processing terminals without an ISDN user/network interface to an ISDN.

0002

2. Description of the Related Art Conventional terminal adapters are configured to transmit and receive data at an arbitrary speed after a call is established, and to release the call after the transmission and reception are completed. A call is connected while the terminal adapter is receiving data from the terminal.

0003

[Problem to be Solved by the Invention] As described above, with conventional terminal adapters, a call is established while data is being transferred at the data transfer rate between the terminal adapter and the terminal, so if the terminal can only input/output data at a low speed. In,
Since the line connection time depends on the data input/output speed of the terminal, there is a drawback that the high-speed data transfer function of ISDN cannot be used effectively.

SUMMARY OF THE INVENTION An object of the present invention is to provide a terminal adapter that can effectively utilize ISDN high-speed data communication even when the terminal is only capable of low-speed data input/output.

[0005]

[Means for Solving the Problems] In order to solve such problems, the terminal adapter according to the present invention is
In a terminal adapter for connecting a data processing terminal without a DN user/network interface to an ISDN network, a received data storage means for storing data received from a partner terminal adapter via the ISDN network with error control; a transmission data accumulation means for accumulating data to be transmitted with error control to the destination terminal adapter via a network; and a data output means for converting data from the reception data accumulation means to the data processing terminal to an arbitrary speed. , a data input means for converting data from the data processing terminal to the terminal adapter to an arbitrary speed and inputting it to the transmission data storage means, and a data storage amount B stored in the transmission data storage means B= S
s*Tt-St*(Tt+Td) where, Ss...I
Effective transmission speed Td by the SDN network...Connection delay time Tt...Talking time per unit charge St...For sending data from the transmission data storage means to the ISDN network when the data input speed condition from the terminal is satisfied. Call origination/disconnection control means for controlling call origination/disconnection so as to initiate a call and disconnect the data transmission when the data storage amount B becomes less than the minimum data amount for performing the error control. It has a configuration characterized by:

[0006]

[Operation] With such a configuration, the call time can be optimized even in a terminal having only low-speed input/output, and the high-speed data transfer function of ISDN can be effectively utilized.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of a terminal adapter showing one embodiment of the present invention. In FIG. 1, 100 is a terminal adapter which is an embodiment of the present invention, 101 is a line interface, 102 is an error control section, 103 is a received data storage means, 104 is a transmission data storage means, and 105
106 is a network control unit; 107 is a call time registration unit for registering the call time per unit charge for communication destination; and 110 is a terminal interface.

Line interface 101 separates the B channel signal and D channel signal multiplexed on the user/network interface and distributes them to error control section 102 and network control section 106 . The error control unit 102 performs data error control between terminal adapters. The received data storage means 103 stores received data sent from the terminal adapter of the communication partner via the network. Transmission data storage means 104 stores transmission data sent from the terminal. Data storage amount and call origination/disconnection control means 105 based on the communication destination determines the transmission data amount accumulated in the transmission data storage means 104 and the call time per unit charge registered in the communication destination per unit charge registration means 107. Decide the timing of call/disconnection based on the time,
The control information is transmitted to the network control unit 106.

As an example of this timing determination, IS
Ss is the effective transmission speed obtained by subtracting the signal speed reduction due to error control from the DN line speed, Td is the connection delay time from when a call is made until the call is received at the other party's terminal, Tt is the call time per unit charge, Tt is the communication time from the terminal to the terminal. If the data input speed of is St, then the transmitted data storage amount B, which is the timing of calling, is B=S.
s*Tt-St*(Tt+Td) (a
). The timing of disconnection is determined by the error control unit 102.
This occurs when the amount of accumulated transmitted data is less than the minimum amount of data for performing error correction control. The operation flow in FIG. 2 shows this control of call origination/disconnection.

[0010] The network control unit 106 connects the terminal interface 11
D.
Perform call control on the channel. In addition, the network control unit 106
performs incoming call control when there is an incoming call. The communication charge per unit charge registration means 107 can register the call time per unit charge corresponding to the day of the week, holidays/weekdays, time zone, communication destination station number, and own station number. It also has the ability to update as needed. Terminal interface 110
a data input means 111 for inputting data from a terminal;
It has data output means 112 that outputs data to the terminal. Data input means 111 receives data from a terminal at an arbitrary speed, separates it into transmission data and control data, and distributes the data to transmission data storage means 104 and call/disconnection control means, respectively. The data output means 112 is the received data storage 10
3 and the call origination/disconnection control unit means 1.
Output the control data from 05 to the terminal at an arbitrary speed. The data input means 111 and the data output means 112 have a function of error control with the terminal as necessary.

[0011]

[Effects of the Invention] As explained above, the present invention optimizes call time even in terminals with only low-speed input/output.
This has the advantage that call charges can be kept to a minimum and ISDN's high-speed data transfer can be used.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is an operation flow showing control of call origination for data transmission and disconnection to stop data transmission used in the present invention.

[Explanation of symbols]

101 Line interface 102 Error control section 103 Received data storage means 104 Transmission data storage means 105 Data storage amount and call origination/disconnection control means 106 based on communication destination 106 Network control section 107 Call time registration means per unit charge for communication destination 110 Terminal interface 111 Data input means from the terminal 112 Data output means to the terminal

Claims (1)

[Claims] Claim 1: In a terminal adapter that connects a data processing terminal without an ISDN user/network interface to an ISDN network, a received data storage system that stores data received from a partner terminal adapter via the ISDN network with error control performed. means, transmission data storage means for storing data to be transmitted to the destination terminal adapter with error control via the ISDN network, and converting data from the received data storage means to the data processing terminal at an arbitrary speed. data output means for converting data from the data processing terminal to the terminal adapter to an arbitrary speed and inputting the converted data to the transmission data storage means; and data storage stored in the transmission data storage means. The quantity B is B=Ss*Tt-St*(Tt+Td), where S
s...Effective transmission speed by the ISDN network Td...Connection delay time Tt...Talking time per unit charge St...When data input speed conditions from the terminal are satisfied, data is sent from the transmission data storage means to the ISDN network. call origination/disconnection control means for controlling call origination/disconnection so that the data transmission is terminated when the data storage amount B becomes less than or equal to the minimum data amount for performing the error control; A terminal adapter characterized by being equipped with.