JPH05122408A - Digital public terminal equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] In a digital public terminal device which is connected to an ISDN network and uses a card to make a call or data communication, forcibly disconnects the call or the communication due to a delay in inserting the card. [Structure] A digital public terminal device is provided with two card readers 22 and 32 so that a plurality of first and second cards can be accommodated at the same time, and an ISDN line is used during a telephone call or data communication with the other party via an ISDN line 1. When the billing signal arrives from 1, the card according to the priority order is selected from the accommodated first and second cards and billed. Then, for example, when the billing signals corresponding to the respective channels are used frequently when the two B channels are simultaneously used, when the remaining number of the first card is exhausted, the second card is selected and billed. Therefore, the forced disconnection of the call due to the delay of the card insertion is avoided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital public terminal device accommodated in an ISDN network.

[0002]

2. Description of the Related Art As a commercial service of ISDN, "I
The circuit switching service called "NS Net 64" started in 1988 mainly in large cities, and has since been rapidly spread to various regions throughout the country. By introducing such an ISDN network, various convenient service functions which are not available in the conventional analog network are realized. That is, by using the conventional metallic cable that is wired to each home as it is, two 64 kbps B channels and 16
Since the D channel of kbps can be multiplexed, it becomes possible to use the two B channels to simultaneously make a call or perform data communication with different parties. In recent years, such ISD
There is a strong demand for the development of digital public terminal devices such as digital public telephones and digital public facsimiles that can be accessed from the street and provided on the N network to provide various services.

[0003]

For example, in the case of a digital public telephone, unlike ordinary telephones and data terminals,
A coin or a card in which the remaining number of calls is recorded is inserted in advance to start a call, and a predetermined call charge is stored by a billing signal from a central office.
When accommodated in the SDN network, the following problems occur. That is, for example, when a call or a data communication is performed using two B channels at the same time, as a result of being charged for the use of both B channels, a charging signal individually arrives randomly for each channel, As a result, for example, billing for the B1 channel runs out of card residual number, and while a new card is inserted, billing for the next B2 channel causes forced disconnection of calls and data communications.

[0004]

In order to solve such a problem, the present invention provides a digital public terminal device such as a digital telephone with a plurality of card readers so as to accommodate a plurality of cards at the same time. , A detecting means for detecting a charging signal coming from the ISDN network during communication through the ISDN network, and a charge for selectively storing communication charges from a plurality of cards according to priority when the detecting means detects the charging signal And a storage means.

[0005]

When the billing signal arrives, the card according to the storage priority is selected from among the plurality of stored cards and billed. As a result, when the billing signals individually and frequently arrive at the time of simultaneous use of the two B channels, for example, the second card is billed even when the remaining number of the first card is exhausted, and the card insertion is delayed. Communication and forced disconnection of calls are avoided.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment in which the present invention is applied to a digital public telephone. In the figure,
Reference numeral 1 is an ISDN line, 2 is a line terminating device (DSU) that terminates the line, and a digital public telephone is connected to this DSU 2. The configuration of this digital public telephone is as follows.

That is, 3 is a driver / receiver for transmitting data to the DSU 2 and receiving data from the DSU 2, and 4 is an I interface circuit connected to the driver / receiver 3 for performing a predetermined protocol processing of ISDN,
5 is a CPU that controls the entire public telephone, and 6 is an RO
M and 7 are RAMs, 9 is a key unit for performing various operations, and 10 is a display unit. Reference numeral 11 is a sound source control circuit that controls driving of various sound sources and also performs digital / analog conversion and analog / digital conversion of a sound signal, 12 is a communication circuit, and 13 is a handset.

A SCI circuit unit 16 converts parallel data from the CPU 5 into serial data and sends the serial data to a card reader control unit, which will be described later, and converts serial data from the control unit into parallel data and transmits the parallel data to the CPU 5. The two card reader control units that are connected to the same circuit unit 16 and control the two card readers 22 and 32 independently have the same configuration. That is, the card reader control unit is composed of the CPUs 20 and 30 and the reader control drive units 21 and 31 for controlling the card reader control units, respectively. As described above, the digital public telephone is provided with the two card readers 22 and 32, and different cards can be simultaneously inserted into the card readers 22 and 32, respectively.

Next, the operation of the CPU 5 of the above embodiment will be described with reference to the flowcharts of FIGS. Figure 2
Is a flow chart showing the calling operation of this digital public telephone. When the first card or the second card is inserted into the card reader 22 or 32, step 10
In step 101, the remaining frequency of the card which is determined to be “Y” at 0 and subsequently inserted is calculated. afterwards,
When a calling operation is performed, it is determined to be "Y" in step 102, and a calling process based on a predetermined protocol is performed in 103. When the other party responds, the determination in step 104 becomes "Y", and in this case, the charging process for subtracting the remaining number from the card is executed based on the charging data signal coming from the ISDN line 1 (step 105). The details of this charging process will be described later.

Thereafter, in step 106, it is determined whether or not there is a card to be inserted into each card reader in order to make up for the shortage of the call charge. If the talk is judged and the ending talk is judged as “N”, step 10
Returning to step 5, the charging process by the arrival of the charging signal is repeatedly executed. If the insertion of the card is detected and it is determined to be "Y" in step 106, the remaining number calculation processing including the inserted card is performed in step 107, and then the termination of the call is determined in step 108. Then, if an on-hook or the like is detected, the card is discharged to the discharge port in step 109, and the process ends.

Next, FIG. 3 is a flow chart showing the details of the above-mentioned charging process. As described above, when the call is transmitted to the partner device via the ISDN line 1 and the response of the partner device is detected, the billing signal periodically arrives from the telephone station via the ISDN line 1. In the case of these ISDN networks, two B channels can be used to talk and data communication simultaneously with different parties. In such a case, billing signals for the use of these two B channels are sent to the digital public telephone. Will arrive individually. Step two
In 00, these individually arrived billing signals (billing data signals) are detected and judged, and when the billing signal arrives and is judged as “Y”, the unit time data and unit are selected from the arrived billing signals. In addition to storing the frequency data, in step 202, a charge storing process is executed to reduce the charge such as a call from each card based on the unit frequency data. The details of this charge storage processing will be described later. When each card is charged in this way, step 20
At 3, the remaining amount (remaining frequency) of the entire card including the charged card is calculated and the process ends.

Next, FIG. 4 is a flow chart showing the details of the fee storing process. As described above, when the billing signal arrives at the digital public telephone, the predetermined frequency is subtracted from the card based on the unit frequency data in this signal. This digital public telephone has each card reader 2
It is also possible to insert the first card and the second card into 2, 32 at the same time. That is, if the frequency is subtracted from the card, it is determined in step 300 that the first card is present. If the first card is present and it is determined to be “Y”, then it is determined in step 302 that the second card is present. If there is no second card, the first card is determined in step 302.
The predetermined unit frequency is subtracted from the card. If there is no first card and it is determined to be “N” in step 300, then it is determined in step 301 that there is a second card,
If a second card is inserted, step 304
Then, the predetermined unit frequency is subtracted from the second card. If the first card is present and the second card is also present and it is determined to be “Y” in step 301, these first, second
The unit frequencies are subtracted from the card in the order according to the predetermined storage priority. If neither the first card nor the second card has been inserted, in step 306 a deadline process for forcibly opening the line is performed and the process ends.

As described above, this digital public telephone is provided with two card readers 22 and 32 so that two cards can be inserted at the same time. For example, the first card can be inserted according to the storage priority. When the charge is stored and the remaining number of the first card is exhausted, the charge is stored from the second card. As a result, when the billing signals individually and frequently arrive when the two B channels are simultaneously used, the second card is billed even if the remaining number of the first card is exhausted, and the card insertion is delayed. Forced disconnection of calls is avoided. In this embodiment, two card readers are provided, but in addition to these, it is possible to provide a coin storage unit for storing inserted coins such as 10 yen and 100 yen. Further, in the digital public telephone of the present embodiment, only the call function has been described, but it is also possible to perform, for example, facsimile communication by adding a data communication function section separately.

[0014]

As described above, according to the present invention,
When the billing signal arrives, the card according to the storage priority is selected from among the plurality of stored cards and is charged. As a result, when the billing signals corresponding to the respective channels are frequently used when the two B channels are simultaneously used, for example, the second card is selected and billed even when the remaining number of the first card is exhausted. Therefore, it is possible to avoid the forced disconnection of the call due to the delay of the card insertion.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a digital public terminal device of the present invention.

FIG. 2 is a flowchart showing an operation of the digital public terminal device.

FIG. 3 is a flowchart showing a billing processing operation of the digital public terminal device.

FIG. 4 is a flowchart showing a charge storage processing operation of the digital public terminal device.

[Explanation of symbols]

 1 ISDN line 2 Line termination device (DSU) 4 I interface circuit 5, 20, 30 CPU 9 Key part 10 Display part 11 Sound source control circuit 16 SCI circuit part 21, 31 Reader control drive part 22, 32 Card reader

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoshi Hoshi 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Inventor Hironobu Hara 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Shinji Takada 5-10-10 Minamiazabu, Minato-ku, Tokyo Anritsu Corporation

Claims (1)

[Claims] 1. A digital public terminal device connected to an ISDN network, wherein the digital public terminal device is provided with a plurality of card readers so that a plurality of cards can be accommodated at the same time, and communication is performed via the ISDN network. A detecting means for detecting a charging signal coming from the ISDN network, and a charge storing means for selectively storing communication charges from the plurality of cards according to the priority when the detecting means detects the charging signal. A digital public terminal device characterized by being provided.