JPH07105826B2 - Data terminal adapter device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data terminal adapter device for connecting to a digital electronic exchange capable of accommodating a data terminal or a modem as a terminal, a digital electronic key telephone device, or the like.

2. Description of the Related Art FIG. 2 shows a typical configuration example in which a conventional data terminal adapter device is implemented in a digital electronic exchange containing a data terminal and a modem. In FIG. 2, 1 is a digital electronic exchange, 2 is a data terminal such as a personal computer, 3 is a modem, and 4 and 5 are data terminal adapter devices (TA). These digital electronic exchange 1, data terminal 2, modem 3 The data terminal adapter devices 4 and 5 are connected by signal lines 6 to 15. 6 is an input data signal line from the data terminal 2 to the data terminal adapter device 4, 7 is an output data signal line from the data terminal adapter device 4 to the data terminal 2, and 8 is a transmission from the data terminal 2 to the data terminal adapter device 4. A request signal line, 9 is a transmission enable signal line from the data terminal adapter device 4 to the data terminal 2, 10 is an input data signal line from the modem 3 to the data terminal adapter device 5, and 11 is from the data terminal adapter device 5 to the modem 3. Is a data request signal line from the data terminal adapter device 5 to the modem 3, and 13 is a signal enable signal line from the modem 3 to the data terminal adapter device 5. 14,15
Is a control line through which the control information of each data terminal adapter device 4, 5 and the electronic exchange 1 passes, and 16 is a call control means in the digital electronic exchange 1 for controlling a call by these control information. Reference numeral 17 denotes a data line between the terminal adapter devices 4 and 5 which are connected by the call control of the call control means 16 and through which digital data flows.

Next, the operation of the above conventional example will be described.

Usually, the modem 3 and the data terminal 2 are directly connected. Therefore, the input data signal line 6 and the output data signal line 11, the output data signal line 7 and the input data signal line 10, and the transmission request signal line 8
12 and the transmission enable signal lines 9 and 13 are directly connected to each other and used. However, when the modem 3 is accommodated in the digital electronic exchange 1, it often takes the form of a modem pool in which one modem is shared by the system. At this time, since the data signal lines 6, 7, 10, 11 of the data terminal 2 and the modem 3 pass through the digital signal line 17 of the digital electronic exchange 1 once, it is necessary to convert the speed and the like. The conversion is performed by the data terminal adapter devices 4 and 5. The data terminal adapter devices 4 and 5 also correspond to the signal lines 8, 9, 12 and 13 for controlling the data terminal 2 and the modem 3. Normally, when the data terminal 2 sends data, the transmission request signal line 8 is turned ON, and when the transmission enable signal line 9 is turned ON, the data is sent.

In FIG. 2, when the transmission request signal line 8 is turned on, the data terminal adapter device 4 transmits this control information to the data terminal adapter device 5 through the control lines 14 and 15, and the data terminal adapter device 5 sends it to the modem 3. Transmission request signal line
Turn on 12. As a result, the modem 3 sends the carrier to the analog external line 18, but when the data communication becomes possible, the transmission enable signal line 13 is turned on. The data terminal adapter device 5 may transmit this control information to the data terminal adapter device 4 using the control lines 15 and 14 in the same manner as described above, but in general, when the transmission request signal line 8 is turned on. , Transmission ready signal 13 is ON
A method is adopted in which a timer more than that expected to be applied is applied, and when the time-out occurs, the data terminal adapter device 4 turns on the transmission enable signal 9 for the data terminal 2 pair. At this point,
Data transmission from the data terminal 2 is started from the input data signal line 6.

However, the above-mentioned conventional data terminal adapter devices 4,5
Then, in order to predict ON of the transmission enable signal line 13 of the modem 3 with a timer and turn ON the transmission enable signal line 9 for the data terminal 2,
Although the modem 3 actually turns on the transmission enable signal line 13,
Turning on the transmission enable signal line 9 for the data terminal 2 is delayed, resulting in poor transmission efficiency. Also, contrary to the above, the modem 3
Although the transmission enable signal line 13 of is not turned on,
In some cases, the data terminal adapter device 4 turns on the transmission enable signal line 9 for the data terminal 2 and data loss occurs.

The present invention solves such a conventional problem, and an object of the present invention is to provide a data terminal adapter device capable of reliably transmitting a transmission enable signal to a data terminal at high speed. It is a thing.

Means for Solving the Problems To achieve the above object, the present invention comprises a transmission data multiplexing means for transmitting a transmission enable signal between a modem connected as a terminal and a data terminal by multiplexing with data. It is a thing.

Therefore, according to the present invention, the transmit ready signal of the modem is
A digital signal line of a digital electronic exchange or the like can be used in a time division manner, and a transmission delay (about several milliseconds) inside the digital electronic exchange or the like can be reflected in a transmission enable signal shown to a data terminal.

Examples Hereinafter, examples of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of an embodiment of the present invention.

In the present embodiment, the same parts as those in the above-mentioned conventional example are designated by the same reference numerals and different configurations will be described. First
In the figure, the data terminal 2, the modem 3, and the data terminal adapter devices 4 and 5 are also shown as being combined. Reference numeral 21 is a control signal detecting means, which indicates the state of the transmission request signal of the transmission request signal line 8 in the case of the data terminal 2 and the transmission enable signal line in the case of the modem 3.
Detects 13 transmit ready signal states. Reference numeral 22 is a control signal generating means, which in the case of the data terminal 2 transmits a transmission enable signal to the transmission enable signal line 9 and in the case of the modem 3 the transmission request signal line 12
Put the transmission request signal on. Reference numeral 23 is a transmission data extracting means, which in the case of the data terminal 2 receives the data from the input data signal line 6 and in the case of the modem 3 the input data signal line 10
Capture data from and edit it into data in the digital electronic exchange. Reference numeral 24 is a reception data restoring means, which extracts the reception data, converts it into a digital signal of the data terminal 2 or the modem 3, sends it to the output data signal line 7 in the case of the data terminal 2, and in the case of the modem 3. Is sent to the output data signal line 11. Reference numeral 25 is a transmission data multiplexing means, 26 is a reception data separation means, and 27 is a transmission / reception means for performing input / output with the digital signal line 17 of the digital electronic exchange.

Next, the operation of the above embodiment will be described.

Normally, the digital signal line 17 of the digital electronic exchange is
Since it passes audio data, it has a transmission capacity of about 64 Kbps.
On the other hand, the data speed of the data terminal 2 and the modem 3 is 300 to 960.
It is about 0 bps. Therefore, the digital signal line 17 has a considerable margin in transmission capacity. In the present embodiment, first, on the data terminal adapter device 5 side connected to the modem 3, the control signal detecting means 21 detects the transmission enable signal of the transmission enable signal line 13 of the modem 3. On the other hand, the data output from the modem 3 via the input data signal line 10 is edited by the transmission data extracting means 23. Then, the transmission enable signal detected by the control signal detecting means 21 and the data obtained by the transmission data extracting means 23 are multiplexed by the transmission data multiplexing means 25, and these are transmitted by the transmitting / receiving means 27 to the digital signal line of the digital electronic exchange. Send to 17. When the transmission / reception means 27 of the data terminal adapter device 4 side connected to the data terminal 2 receives these multiplexed transmission enable signals and data, the reception data separation means 26 separates the multiplexed transmission enable signals and data. Then, the control signal generating means 22 sends the signal from the transmission enable signal line 9 to the modem 3
The state of the transmission enable signal of can be transmitted to the data terminal 2.

As described above, according to the above-described embodiment, since the transmission enable signal on the modem 3 side can be multiplexed with the data and transmitted to the terminal 2 side, as compared with the conventional case where the timer is used,
It has the effect of reliably and speeding up.

As described above, according to the present invention, the transmission enable signal of the modem accommodated in the digital electronic exchange or the like is multiplexed with the data and used as the transmission enable signal to the data terminal accommodated in the digital electronic exchange or the like. I ’m trying to communicate
The transmission enable signal can be transmitted reliably and at high speed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a data terminal adapter device in an embodiment of the present invention, and FIG. 2 is a block diagram in which a conventional data terminal adapter device is implemented in a digital electronic exchange. 1 ... Digital electronic exchange, 2 ... Data terminal, 3 ...
… Modem, 4,5 …… Data terminal adapter device, 6,10 ……
Input data signal line, 7,11 ... Output data signal line, 8, 12 ...
… Send request signal line, 9,13 …… Sendable signal line, 14,15 ……
Control line, 16 ... Call control means, 17 ... Digital signal line,
18 ... Analog line, 21 ... Control signal detecting means, 22 ... Control signal generating means, 23 ... Transmission data extracting means, 24 ... Reception data restoring means, 25 ... Transmission data multiplexing means, 26 ...
… Receiving data separating means, 27 …… Sending and receiving means.

Claims (1)

[Claims] 1. A data terminal adapter device comprising transmission data multiplexing means for multiplexing a transmission enable signal between a modem connected as a terminal and a data terminal with data and transmitting the data.