CN1033837C

CN1033837C - Terminal adapter in digital network of comprehensive service

Info

Publication number: CN1033837C
Application number: CN90103466A
Authority: CN
Inventors: 吴志美; 胡民远; 倪惜珍
Original assignee: Institute of Software of CAS
Current assignee: Institute of Software of CAS
Priority date: 1990-07-12
Filing date: 1990-07-12
Publication date: 1997-01-15
Anticipated expiration: 2005-07-12
Also published as: CN1058124A

Abstract

The present invention relates to a terminal adapter in a digital network of comprehensive service. One side of the terminal adapter is connected to a user exchange or network termipoint equipment of an ISDN exchanger, and the other side is connected to the traditional terminal equipment, such as computers, facsimile machines and telephones so as to simultaneously carry out voice transmission and data transmission. The terminal adapter adds functions of encryption, decryption, the emulation of a modulator-demodulator and X. 25 protocol control, gets rid of a display control component and a display so as to greatly add the function of the terminal adapter and more conveniently use.

Description

Terminal adapter in the integrated services digital network

The present invention relates to digital communication, more specifically to the terminal adapter in the integrated services digital network.

Integrated services digital network can provide multiple services such as speech, literal, data, figure, image simultaneously.These services were provided respectively by telephone network, telegraph network, data network in the past.Terminal adapter is the equipment of user's one side in the integrated services digital network.By terminal adapter legacy equipment (as computer, facsimile machine, telephone set etc.) is inserted integrated services digital network.The operational environment of terminal adapter is by shown in Figure 1.Terminal adapter provides one road Speech Communication passage and a way word communication port simultaneously for the user.Speech channel provides normal telephone service, and digital channel can be for transmitting literal, data, figure and visual at a slow speed.

Existing terminal adapter as shown in Figure 2, its basic functional principle is memory [a 8] storage signal, processor [7] is handled by the content in the memory [8], processor [7] is handled the information interchange between control terminal controller [15] and the terminal equipment [2] to the signal of signal controller [10] simultaneously.Processor [7] is handled the signal of D channel control section [14], and the information interchange between management D channel control section [14] and the S interface control assembly [17].Processor [7] control replacement part [16] is determined that the B1 passage still is the work of B2 passage, and what mode to be carried out work with.Entire work process is shown by display [20] by display controller [19].See Japan Patent 63-1230.

Above-mentioned terminal adapter contains a display and display control assembly, is realizing that terminal signaling is unnecessary parts in the transfer process between the S interface signal.And this terminal adapter does not have the copying of modulator-demodulator, not to the control procedure of agreement X.25, not to the encrypting and decrypting process of digital signal.

Task of the present invention is to provide a kind of adapter, utilizes B1 and the B2 passage given in the S interface on the integrated services digital network, for the user provides speech and digital information service.Increased the copying of modulator-demodulator simultaneously; the software that makes the user develop on telephone network can be directly used in the integrated services digital network; increased the X.25 control procedure of agreement; the software that makes the user develop on X.25 can be directly used in integrated services digital network; increase the encrypting and decrypting process, made user profile in transmission course, be protected.

Fig. 1 is the operational environment of terminal adapter.

Fig. 2 is the schematic diagram of existing terminal adapter.

Fig. 3 is the schematic diagram of terminal adapter of the present invention.

Main points of the present invention are to have removed the required display of existing terminal adapter and demonstration The device control assembly has increased the encryption decipher, X.25 the controller of agreement and modulation /demodulation The emulator of device, so that terminal adapter is simple in structure, function increases.

Below in conjunction with accompanying drawing in detail the present invention is described in detail.Know that by Fig. 1 the basic function of terminal adapter is to provide one road speech channel and a way word passage simultaneously for the user.Speech channel provides common telephone service, and digital channel can be for transmitting literal, data and figure.Interface between terminal adapter and the integrated digital service network is the S interface, and it is a kind of international standard, follows CCITT I.430, Q.921, and agreement Q.931.The S interface is made up of 4 lines, and two lines are used for receiving, and two lines are used for sending, and data transmission rate on the S interface is the 144kb/s full duplex.The channel of this 144kb/s be divided into the speech of two 64kb/s and digital channel (B1, B2) and the signaling channel of a 16kb/s (D).The channel of this 2B+D is called the basic access pattern of integrated digital service network.Interface between terminal adapter and the phone is the plug receptacle of one four line, as long as the wiring of the receiver of ordinary telephone set and microphone has been inserted the slot of terminal adapter.Interface between terminal adapter and the legacy equipment (computer, facsimile machine etc.) is the R interface.The R interface is a kind of international standard, follows the V.24 agreement of CCITT.Message transmission rate on the R interface can be specified by the user, and flank speed is 192kb/s.The interface of terminal adapter and microcomputer also can be realized with public memory [15`].Traffic rate depends on the load capacity of B passage on the S interface, and flank speed can reach 64kb/s.Can directly use the power supply of microcomputer when terminal adapter and microcomputer coupling.

As shown in Figure 3, terminal adapter is the intelligence system by the hardware and software collaborative work.The user can use this system by a cover order on terminal, system command comprises:

1 foundation is connected with the speech of remote subscriber.

2 foundation are connected with the data of remote subscriber.

3 with remote subscriber carry out Speech Communication.

4 with remote subscriber carry out file transfer.

5 carry out screen text with remote subscriber communicates by letter.

6 suspend current communication, change over to and the communicating by letter of the third party.

7 recover the communication of time-out in the past.

8 modes by Data transmission on the common telephone network communicate.

9 by usually X.25 the mode of online Data transmission communicate.

10 require the data message that transmits is encrypted.

11 dismountings are connected with the speech of remote subscriber.

12 dismountings are connected with the data of remote subscriber.

The order that the order that requirement connects is connected with dismounting is mainly by TCE terminal control element [15], processor [7], memory [8], D channel control section [14] collaborative work, generation meets the information of S interface protocol, and sends into the D channel of S interface by S interface unit [17].Otherwise, after above-mentioned several module cooperative work, on user terminal, produce vision and audible signal on the information via that comes from the D channel of S interface.From the speech information process replacement part [16] that phone [4] comes up, select B1 passage or B2 passage for use, send distant place user to by S interface unit [17].Otherwise,, send the terminal use to by S interface unit [17] and replacement part [16] from distant place user's speech information.Window dialog information (being referred to as data message) on file transmission information from terminal and the screen, mainly, send into the B1 passage or the B2 passage of S interface by S interface unit [17] by TCE terminal control element [15], processor [7], memory [8] and replacement part [16] collaborative work.Otherwise,, after above-mentioned module cooperative work, give the terminal use from the data message that the S interface comes.

The user imports the used AT order of modulator-demodulator on the common telephone network, simulator [11] by modulator-demodulator makes an explanation, convert corresponding integrated services digital network signaling to,, send into the D channel of S interface after S interface control assembly [17] is handled again by D channel control section [14].The communication software developed on telephone network of user like this can not add to revise and is directly used in integrated services digital network.Be familiar with the user of data communication on the telephone network, the mode that can use them to be accustomed to communicates on integrated services digital network.The order that user input is X.25 online is made an explanation by controller [12] X.25, converts corresponding integrated services digital network signaling to, and by D passage control part [14], S interface control assembly [17] is sent into the S interface after handling.Like this, the user is at the online software of developing X.25, can not add to revise to be directly used in integrated services digital network.Be familiar with the X.25 user of online data communication, the mode that can use them to be accustomed to communicates on integrated services digital network.After the terminal use imported encrypted command, encrypting and decrypting device [13] was encrypted earlier institute's information transmitted in the data connection of later foundation, sends into B1 or B2 passage again.

Terminal adapter structure of the present invention is simple relatively, and used unit is few, and its function increases greatly, uses more convenient.

Claims

1. a kind of terminal adapter in the integrated services digital network, it comprises TCE terminal control element [15] or public memory [15`], replacement part [16], S interface control assembly [17], signal controlling part [10], D channel control section [14], processor [7] and memory [8], replacement part [16] links to each other with TCE terminal control element [15] or public memory [15`], also link to each other simultaneously with S interface control assembly [17], signal controlling part [10] links to each other with TCE terminal control element [15] or public memory [15`], also link to each other with memory [8] with processor [7] simultaneously by bus [9], D channel control section [14] links to each other with S interface control assembly [17], also link to each other with memory [8] with processor [7] simultaneously by bus [9], it is characterized in that in the described signal controlling part [10] encrypting and decrypting device [13] being arranged, it can be handled carry out encryption and decryption in the information of B1 or B2 channel after receiving the user encryption decryption command.

2. terminal adapter according to claim 1, in the wherein said signal controlling part [10] X.25 protocol controller [12] is arranged, it can be after the X.25 request of receiving the user, X.25 agreement to user's input makes an explanation, convert thereof into the data format of integrated services digital network requirement, send network to, also the information translation of coming on the integrated services digital network is become the X.25 form of protocol requirement conversely, send the terminal use to.

3. terminal adapter according to claim 1 and 2, in the wherein said signal controlling part [10] the modulator-demodulator simulator is arranged, the AT order that it can use modulator-demodulator on the telephone network, convert signaling corresponding on the integrated services digital network to, send into network, and the integrated services digital network signaling that network comes converted to the AT order that modulator-demodulator uses, give the terminal use.