JPH02165750A - Terminal adapter incorporating modem - Google Patents

Abstract

PURPOSE:To freely communicate with all the opponents having an analog line interface and a digital line interface, or a packet interface by one kind of terminal adapter by providing first and second switching means. CONSTITUTION:The first switching means 40 switches and connects selectively the analog input/output side of an analog data terminal means 39 to either the analog input/output sides of an encoder/decoder means 35 and a modem means 38. Also, the second switching means 42 switches and connects selectively the digital input/output side of a digital terminal means 41 to either the digital input/output sides of a packet assembling/disassembling means 37 and the modem means 38. Thereby, it is possible to freely communicate with the connecting opponent having the analog line interface and the digital line interface, or the packet interface from a data terminal provided with either an analog interface or a digital interface.

Description

[Detailed Description of the Invention] [Summary] It relates to a terminal adapter connected to a digital network such as 15DN, and more specifically, from a data terminal equipped with an analog or digital interface to an analog line interface, digital line interface, or packet interface. Regarding terminal adapters for communicating with connected parties that have an analog line interface or
A coding method that terminates the line channel accommodated in a digital network and converts it to and from analog data, with the purpose of enabling free communication with either a connected partner that has a digital line interface or a packet interface. /a decoding means, a packet assembly/disassembly means for terminating a packet channel accommodated in a digital network and for mutually converting between digital data and a modem for mutually converting between digital data and analog data; first switching means for selectively switching and connecting any two of the analog input/output side of the analog data terminal means and each analog input/output side of the encoding/decoding means and the modem means; and second switching means for selectively switching and connecting any two of the digital input/output side of the digital data terminal means and each digital input/output side of the packet assembling/disassembling means and the modem means. Configure.

[Industrial application field]

The present invention relates to a terminal adapter connected to a digital network such as 15DN, and more specifically, it is a terminal adapter that allows a data terminal equipped with an analog or digital interface to communicate with a connection partner having an analog line interface, digital line interface, or packet interface. Regarding the terminal adapter to do.

[Conventional technology]

With the development of public networks and digital technology, it has become possible to easily exchange digital data between remote locations.

FIG. 7 shows a configuration in which a host computer is accessed from a data terminal via a public network in which an analog W4 (telephone line network), a packet network, and an I5DN (integrated service digital network) are integrated.

First, let us consider a case where a data terminal l of a modem 3 connected to an analog network 5 communicates with a host computer 2m. In this case, the processing data at data terminal l is
The data is converted into analog modulated data (hereinafter simply referred to as analog data) 4 via the modem 3 and sent to the analog network 5.
After the exchange connection is made, the data is input to the modem 6 connected to the host computer 21. The data is then converted into digital data by the modem 6 and transmitted from the boat 8 to the host computer 2. Enter. When data is to be sent from the host computer 21 to the data terminal l, it can be realized by the completely opposite flow to the above.

Next, a data terminal l similar to the above is connected to a host computer 2. Consider the case of communicating with In this case, the processed data at the data terminal 1 is input to the analog network 5 in the same manner as described above, and then exchanged and input to the modem 9. Then, after being converted into digital data lO by modem 9,
Additionally, a packet assembly/disassembly device (hereinafter referred to as PAD)
11, it is assembled into packet data 12. This packet data 12 is exchanged via a packet network 13 and then transferred to the host computer 2. input to PADl5 connected to. Then, it is converted into digital data 16 again at PAD 1 5, and inputted to the host computer 2b through port 17. When data is to be sent from the host computer 2b to the data terminal l, it can be realized by the completely opposite flow to the above.

Analog that allows access by data terminal 1 as in the above two examples! Apart from ii5, recently, progress has been made in the development of l5DN (Integrated Service Digital Wi) to make it easier for users to handle digital data, and there are already 64 channels per user called B channels.
A total of three channels have been realized: a line channel with a data transmission rate of 16 kbit/s, and a packet channel called the D channel with a data transmission rate of 16 kbit/s. channels are being provided.

A conventional example in which a data terminal accesses a host computer via a B channel or a D channel is shown in FIG. 8 in conjunction with FIG. 7.

First, the data terminal 25 with a built-in modem 26 shown in FIG. 8(a) connected to the B channel accommodated in the 15DN1B shown in FIG. 7 is connected to the host computer 2 or 2. Consider the case of accessing . First, when communicating with the host computer 21 in FIG. 7, the data terminal 2 in FIG.
5 is converted into analog data 27 via a modem 26, and then transferred to a terminal adapter (hereinafter referred to as T
28 (referred to as A), is A/D converted and encoded by a data converter (hereinafter referred to as C0DEC) 29 in the same adapter, and is converted into B channel data 19 (time-division line data). Ru. This B channel data 19 is exchanged and connected at the l5DN 18 in FIG. 7, and is again converted into analog data 21 at the CODEC 20 provided by the same network, and linked to the analog w45.

Then, after being further exchanged and connected through the analog network 5, the host computer 2. Input suru.

Host Conview °-Evening 2. When data is to be sent from the data terminal 25 to the data terminal 25 shown in FIG. 8(a), the flow can be completely reversed to that described above.

Second, when the data terminal 25 in FIG. 8 communicates with the host computer 2b in FIG.
It is the same as the first case described above until it is accommodated in the analog network 5 via
ADII, packet I[13 and PADl 5 are input to the host computer 2b.

Next, consider a case where the data terminal 30 having the digital interface of FIG. 8(b) connected to the B channel accommodated in the 15DN1B of FIG. 7 accesses the host computer 2b of FIG. In this case, the data processed at the data terminal 3o in FIG. 8 is input to the TA 32 as digital data 31, and
33 and converted into D channel data 22. This D channel data 22 is 15D in FIG.
In the packet handler 23 provided by the N1B exchange connection, the packet data 24 is converted into packet data 24 that can be accommodated by the packet network 13.
Linked to 3. After further exchange connection using packets 1-m13, the data is input to the host computer 2b via the PAD15 connected to the host computer 2b. When data is to be sent from the host computer 2b to the data terminal 3o in FIG. 8(b), the flow can be completely reversed to that described above.

As described above, when connecting the data terminal 25 or 30 in FIG. 8(a) or (b) to the l5DN 18 in FIG. 7, the B channel data 19 or D Dedicated TA for linking with channel data 22
(Terminal adapter) 28 or 32 is required.

[Problem to be solved by the invention]

Here, since line connections are generally time-based, charges are incurred at all times during the connection. Therefore, the host computer 21, which is housed in the line-switched analog m5 shown in FIG. 7, often has continuous data access. Therefore, the data terminal 25 with a built-in modem 26 in FIG. 8(a) is a TA with a built-in C0DEC29.
2B to analog M from l5DN18 in Figure 7.
A host computer housed in 45 2. When accessing , you can use an efficient line connection.

On the other hand, in packet switching, charges are charged according to the amount of information in the exchanged packet data, so the host computer 2b accommodated in packet m13 in FIG. There are many cases. However, the data terminal 25 in FIG. 8(a) is TA2B in the same figure.
The packet y113 from l5DN1B in FIG.
When accessing the host computer 2b housed in the 15DN 18, due to the limitations of the service protocol of the 15DN 18, it is necessary to link the analog data 21 to the analog WI 5 via the B channel and then to the packet network 13. This means that one line of the B channel will be monopolized. Therefore, if the line is monopolized even when accessing the host computer 2b contained in the packet m13 as described above, the time when no data communication is being performed will be subject to billing, which is the advantage of using packet switching. This has the problem of being inefficient and uneconomical.

On the other hand, the data terminal 30 having the digital interface shown in FIG. 8(b) receives packets from the l5DN1B shown in FIG. i! 13
When accessing the host computer 2b housed in the 15DN1B, the packet M413 can be directly accessed from the 15DN1B via the D channel, and the benefits of using packet exchange based on information charge can be enjoyed.

However, in TA32 as shown in Figure 8 (b), l5DN
Due to the limitations of the service protocol of 1B, the analog network 5 cannot be accessed, and therefore the host computer 2° connected to the analog network 5 cannot be used.

An object of the present invention is to enable a data terminal equipped with either an analog or digital interface to freely communicate with a connection partner having an analog line interface, digital line interface, or packet interface.

[Means to solve the problem]

FIG. 1 is a block diagram of the present invention. Of these, the part surrounded by the dashed line is the terminal adapter.

The encoding/decoding means 35 is a means for terminating the line channel 34 accommodated in a digital network (not shown) and converting it to and from analog data. The same means is
For example, it is a termination circuit that terminates the B channel of the basic interface of the digital network I5DN (Integrated Service Digital Communication 'is) and performs mutual conversion with data modulated as an analog signal.

The packet assembling/disassembling means 37 is a means for terminating the packet channel 36 accommodated in the digital network and performing mutual conversion between the packet channel 36 and digital data. The means is, for example, a termination circuit that terminates the D channel of the basic interface of the I5DN and assembles or disassembles packets with digital data.

The modem means 38 is means for mutually converting data modulated as an analog signal and digital data.

The first switching means 40 selectively switches and connects the analog input/output side of the analog data terminal means 39 and any two of the analog input/output sides of the encoding/decoding means 35 and the modem means 38. It is a means. Here, the analog data terminal means 39 is, for example, a terminal having a built-in modem and capable of inputting and outputting data modulated as an analog signal.

The second switching means 42 is means for selectively switching and connecting the digital input/output side of the digital terminal means 41 and any two of the digital input/output sides of the packet assembly/disassembly means 37 and the modem means 38. be. The means is, for example, a terminal having a digital interface and capable of directly inputting and outputting digital signals.

In addition, in FIG. 1, the digital data terminal means 41
If this is not necessary, the second switching means 42 is not necessary, and the modem means 38 and each digital input/output side of the packet assembly/disassembly means 37 may be directly connected.

Conversely, if the analog data terminal means 39 is not required, the first switching means 40 is not necessary, and the analog input/output sides of the modem means 38 and the encoding/decoding means 35 may be directly connected.

[For production]

In the first case, the analog data terminal means 39 is desired to be connected to the line channel 34 in order to access a host computer (not particularly shown) connected via the line channel. , the first switching means 40 is the analog data terminal means 39
and each analog input/output side of the encoding/decoding means 35 are connected. This allows the analog data terminal means 39 to be connected to the line channel 34.

In a second case, when the analog data terminal means 39 wants to connect to the packet channel 36 in order to access a host computer (not particularly shown) connected via the packet channel, One switching means 40 connects the analog data terminal means 39 and each analog input/output side of the modem means 38. Further, a second switching means 42 connects each digital input/output side of the modem means 38 and the packet assembly/disassembly means 37. This allows the analog data terminal means 39 to connect to the packet channel 36.

In a third case, the digital data terminal means 41
When it is desired to connect the digital data terminal means 41 to the line channel 34 in order to access a host computer or the like (not particularly shown) connected via the line channel, the first switching means 40 connects the modem means 38 and
Each analog input/output side of the decoding means 35 is connected. Further, the second switching means 42 is connected to the digital data terminal means 41.
and each digital input/output side of the modem means 38 are connected.

Thereby, the digital data terminal means 41 can be connected to the line channel 34.

As a fourth case, the digital data terminal means 41
When it is desired to connect the digital data terminal means 41 to the packet channel 36 in order to access a host computer (not shown) connected via the packet channel, the second switching means 42 switches between the digital data terminal means 41 and the packet channel 36. Each digital input/output side of the assembly/disassembly means 37 is connected. This connects the digital data terminal means 41 to the packet channel 36.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings.

First, the network configuration on which this embodiment is based is the same as that in FIG. In this embodiment, l5DNlB in FIG.
It is realized as a TA (terminal adapter) which can terminate the B channel digital 19 and D channel digital 22 of the terminal and connect an analog data terminal and a digital data terminal.

FIG. 2 shows the configuration of the TA 43 of this embodiment.

The C0DEC44 converts analog modulated data input from the terminal A6 side into time-division line data and outputs it to the terminal X side as B channel data 19, and conversely inputs it from the terminal X side as B channel data 19. Convert time-division line data to analog modulated data and connect it to terminal A.
This is a data conversion device that outputs data to the 6 side. Here, the B channel data 19 is data on the B channel which is a time division line channel accommodated in the 15DN 18 in FIG.

The PAD 45 assembles packet data from digital data input from the terminal D6 side and outputs it to the terminal Y side as D channel data 22, and vice versa.
This is a packet assembling/disassembling device that disassembles packet data input as channel data 22 and outputs it as digital data to the terminal D6 side. Here, the D channel data 22 is data on the D channel, which is a packet channel accommodated in the l5DN 18 in FIG.

The modem 46 converts analog modulated data input from the terminal A7 side into digital data and outputs it to the terminal D7 side, and conversely converts digital data input from the terminal D7 side into analog modulated data. terminal A7
It is a data conversion device that outputs to the side.

The analog boat 47 is a circuit for connecting an analog data terminal 49 with a built-in modem 50 to the outside of the TA 43 via a terminal A1.

The digital boat 48 is a circuit for connecting a digital data terminal 51 having a digital interface capable of inputting and outputting digital data to the outside of the TA 43 via a terminal D1.

The switch 49 selectively connects the terminal A7 connected to the analog input/output side of the modem 46 to the terminal A2 connected to the analog port 47 or to the terminal A3 connected to the terminal A4 of the switch 50.

The switch 50 selectively connects the terminal 6 connected to the analog input/output side of the CODEC 44 to the terminal A4 connected to the terminal A3 of the switch 49 or the terminal A5 connected to the analog port 47.

The switch 51 selectively connects the terminal D7 connected to the digital input/output side of the modem 46 to the terminal D2 connected to the digital boat 48 or the terminal D3 connected to the terminal D4 of the switch 52.

The switch 51 selectively connects the terminal D6 connected to the digital input/output side of the PAD 45 to the terminal D4 connected to the terminal D3 of the switch 51 or the terminal D5 connected to the digital boat 48.

The operation of the embodiment having the above configuration will be explained in four cases using the operation explanatory diagrams of FIGS. 3 to 6. In addition, the third
6 are based on the configuration of the present embodiment shown in FIG. 2, so unless otherwise specified, FIG. 2 will also be referred to at the same time.

First, in the first case, a modem 50 is installed outside the TA43.
An analog data terminal 49 with a built-in
Consider the case of accessing 1.

In this case, analog data terminal 49 is connected to analog boat 47 via terminal A1. The switches 49, 51 and 52' are not connected to any terminal, but the terminal A6 of the switch 50 is connected to the terminal A5.

As a result, the processing data at the analog data terminal 49 is transmitted via the modem 50 to the analog modulated data (
(hereinafter simply referred to as analog data), T
Enter in A43.

The analog data 52 is input from the terminal AI to the analog port 47, then transmitted from the terminal A5 to the terminal A6 by the switch 50, and input to the CODEC 44.

Then, it is A/D converted and encoded by the CODEC 44, and is output from the terminal X as B channel data 19.

This B channel data 19 is exchanged and connected at 15DN1B in FIG.
In the EC 20, it is again converted into analog data 21 and linked to the analog wI5. As a result, after the analog WI5 is further exchanged and connected, the host computer 2. input to the modem 6 connected to. The data is then converted into digital data by the modem 6 and transmitted from the boat 8 to the host computer 2. Enter. Host computer 2. When data is to be sent from the analog data terminal 49 to the analog data terminal 49, the flow can be completely reversed to that described above.

Next, as a second case, consider a case in which the analog data terminal 49 similar to the first case accesses the host computer 2b via the l5DNI 8 in FIG.

In this case, analog data terminal 49 is connected to analog boat 47 via terminal A1. Also, switch 4
The terminal A7 of the switch 51 is connected to the terminal A2, the terminal D7 of the switch 51 is connected to the terminal D3, and the terminal D6 of the switch 52 is connected to the terminal D4. The switch 50 is not connected to any terminal.

Thereby, the processed data at the analog data terminal 49 is input to the TA 43 as analog data 52.

The analog data 52 is transmitted from the terminal A2 to the switch 49.
The signal is transmitted to terminal A7 and input to the analog input/output side of modem 46. In the modem 46, the analog data 52 is converted into digital data and output from the digital input/output side to the terminal D7.

The digital data output to terminal D7 is sent to switch 5.
1 to the terminal D3, and further transmitted from the terminal D4 to the terminal D6 by the switch 52, and is input to the PAD 45.

PAD 45 packetizes the digital data, converts it into D channel data 22, and outputs it from terminal Y.

This D channel data 22 is exchanged and connected at l5DN18 in FIG.
linked to. As a result, the packet 1ii13 is further exchanged and connected, and then input to the PAD1 5 connected to the host computer 2b. Then, it is converted into digital data 16 again at PAD15, and inputted from boat 17 to host computer 2I. When data is to be sent from the host computer 2 to the analog data terminal 49, the flow can be completely reversed to that described above.

In the third case, a digital data terminal 51 with a built-in digital interface is connected to the outside of the TA 43, and the terminal connects to the host computer 2. Consider the case of accessing.

In this case, mid-digital data terminal 51 is connected to digital boat 48 via terminal DI.

Also, the terminal D7 of the switch 51 is connected to the terminal D2, the terminal A7 of the switch 49 is connected to the terminal A3, and the switch 51 is connected to the terminal D2.
Connect terminal A6 of 0 to terminal A4.

The switch 52 is not connected to any terminal.

Thereby, the processed data at the digital data terminal 51 is inputted to the TA 43 as digital data 53, and then transmitted from the terminal D1 to the terminal D7 by the switch 51, and inputted to the digital input/output side of the modem 46.

In the modem 46, the digital data 53 is converted into analog data and output from the analog input/output side to the terminal A7.

The analog data output to terminal A7 is sent to switch 49.
The signal is transmitted to the terminal A3 by the switch 50, and further transmitted from the terminal A4 to the terminal 6 by the switch 50, and is input to the CODEC 44.

Then, it is converted into B channel data 19 by the C0DEC 44, and from then on, it is done exactly the same as in the first case.
The signal is input from 15DN1B to the host computer 21 via the analog FJ45. Host computer 2. When data is to be sent from the digital data terminal 51 to the digital data terminal 51, the flow can be completely reversed to that described above.

Finally, as a fourth case, consider a case in which the digital data terminal 51 similar to the third case accesses the host computer 2b via the 15DN 18 in FIG.

In this case, the digital data terminal 51 is connected to the digital boat 4 via the terminal DI.

The switches 49, 50 and 51 are not connected to any terminal, but the terminal D6 of the switch 52 is connected to the terminal D5.

Thereby, the processed data in the digital data terminal 51 is inputted to the TA 43 as digital data 53, and then transmitted from the terminal DI to the terminal D6 by the switch 52 and inputted to the PAD 45.

Then, it is converted into D channel data 22 by the PAD 45, and thereafter, l5
The data is input from the DN 1B to the host computer 2b via the packet line 13. When data is to be sent from the host computer 2b to the digital data terminal 51, the flow can be completely reversed to that described above.

As described above, according to this embodiment, when the analog data terminal 49 incorporating the modem 46 accesses the host computer 2b connected to the bucket M413, the l5
It is possible to link directly to the packet network 13 via the D channel of the DN 18, thereby making it possible to communicate with the host computer 2b without monopolizing an extra line as in the conventional example.

Further, the digital data terminal 51 having a digital interface is connected to the analog! 2. A host computer connected to 1li15. It becomes possible to access.

In addition, the host computer 2m or 2b is ■5DN1
It is also possible to connect directly to the line channel or packet channel of B, and in this case too, analog data terminal 49 or digital data terminal 5
You can access from 1.

〔Effect of the invention〕

According to the present invention, with one type of terminal adapter, a data terminal equipped with either an analog or digital interface can freely communicate with a connection partner having an analog line interface, a digital line interface, or a packet interface. becomes possible.

In particular, the terminal adapter according to the invention is a C0DEC
, PAD, and modem, and only a few switches, it is possible to realize a high-performance adapter at low cost.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the present invention. FIG. 2 is a configuration diagram of an embodiment of the present invention. FIG. 3 is a diagram showing a case where analog data terminals are connected by B channel circuit switching. Figure 5 shows the case in which analog data terminals are connected by D channel packet switching, Figure 5 shows the case in which digital data terminals are connected by B channel line switching, and Figure 6 shows the case in which digital data terminals are connected by B channel circuit switching. Figure 7 is a network configuration diagram that integrates an analog network, packet network, and I5DN, and Figures 8 (a) and (b) are configuration diagrams of a conventional example. be. 34... Line channel, 35... Encoding/decoding means, 36... Packet channel, 37... Packet disassembly/assembly means, 38... Modem means, 39... Analog data terminal means , 40...first switching means, 41...digital data terminal means, 42...second
switching means.

Claims (1)

[Claims] 1) Encoding/decoding means (35) for terminating a line channel (34) accommodated in a digital network and converting between analog data and analog data; Packet assembly/disassembly means (37) that terminates the packet channel (36) and performs mutual conversion between digital data and modem means (37) that performs mutual conversion between digital data and analog data.
8), and the analog input/output side of the analog data terminal means (39), the encoding/decoding means (35) and the modem means (
a first switching means (40) selectively connecting any two of the analog input/output sides of the digital data terminal means (41) and the packet assembly/disassembly means (38); 37) and said modem means (38)
). A terminal adapter with a built-in modem. 2) Encoding/decoding means that terminates a line channel accommodated in a digital network and performs mutual conversion with analog data, and terminates a packet channel accommodated in a digital network and converts mutually with digital data. a modem means connected to the digital input/output side of the packet assembling/disassembling means and converting between analog data and the analog input/output side of the analog data terminal means; , a terminal adapter with a built-in modem, comprising switching means for selectively connecting each analog input/output side of the encoding/decoding means or the modem means. 3) Encoding/decoding means that terminates a line channel accommodated in a digital network and performs mutual conversion with analog data, and terminates a packet channel accommodated in a digital network and performs mutual conversion with digital data. a modem means connected to the analog input/output side of the encoding/decoding means and converting between data and digital data; and a digital input/output side of the digital data terminal means. A terminal adapter with a built-in modem, characterized in that it has a switching means for selectively connecting the packet assembling/disassembling means or each digital input/output side of the modem means.