JPS6359138A - Communication equipment - Google Patents

Abstract

PURPOSE:To attain a communication even without the address of a private line network by providing a means inputting the 1st address of a terminal equipment of the private line network from a public line network, a means inputting the 2nd address of the terminal equipment in the private line network and a means storing the 1st and 2nd addresses correspondingly. CONSTITUTION:When an incoming packet is received from a packet exchange network 1 and no extension address is included therein, whether or not a registration table having an incoming coll DTE address exists in a memory 23 is checked. When the DTE address and its extension address are registered in the table of the memory 23, the extension address corresponding to the DTE address is added to the incoming coll packet and issues it to a LAN 7. A terminal adaptor 5 in the LAN 7 checks the extension address of the incoming call packet and fetches the packet equal to the extension address of the connected terminal equipment 6 and sends the result to the equipment 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a communication device that connects a public line network and a private line network to transmit and receive data.

[Prior Art] Conventionally, in a communication system that connects a public network and a private network, data terminal equipment (DTE) within the private network is controlled using an extension address within the private network. There was a drawback that when communicating from the public network, the terminal on the public network could not communicate unless it supported the extension address of the DTE on the private network.

[Problems to be Solved by the Invention] The present invention has been made in view of the above-mentioned conventional example, and it is possible to communicate from a public network to a terminal device of a private network without giving an address in the private network. The purpose is to provide communication equipment.

[Means for Solving the Problems] In order to solve the above problems, the communication device of the present invention has the following configuration.

In other words, the communication system is interposed between the public line network and the private line network.
A communication device that performs J control, comprising means for inputting a first address of a terminal device of the private line network as seen from the public line network, and a means for inputting a second address of the terminal device of the private line network. and storage means for storing the first and second addresses in association with each other.

[Operation] The above configuration operates so that communication can be performed by referring to the address in the storage means without giving an address in the private network to the terminal device in the private network from the public network.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[Description of Communication System (Fig. 1) Fig. 1 is a block diagram of a communication system according to an embodiment of the present invention.

In the figure, 1 is a public line packet switching network that supports, for example, the X.25 protocol. 2 is packet switching network 1
This is a terminal device that is connected to a local area network (LAN) and does not have a function that supports extension addresses of private networks such as local area networks (LANs). A communication server 3 controls the connection between the packet switching network 1 and the LAN 7, and is equipped with a keyboard 3-1 for inputting information. 4 is LAN
7 is a transmission path, and 5 is a terminal adapter that connects and controls the transmission path 4 and the terminal device 6. 6 is a terminal device connected to the LAN 7, which inputs and outputs information to the LAN 7;

[Configuration diagram of communication server (FIG. 2)] FIG. 2 is a configuration diagram of the communication server 3 of this embodiment, and the same parts as in FIG. 1 are indicated by the same symbols.

In the figure, 20 is a transmission/reception control unit that controls data transmission and reception to the transmission path 4 of the LAN 7, and 21 is an interface control unit that controls the interface between the packet switching network 1 and the communication server 3. Reference numeral 22 denotes a CPU comprising, for example, a microprocessor, which controls the communication server 3, and operates according to a control program stored in a ROM. A memory 23 serves as a work area for the CPU 22 and has tables, etc., which will be described later, and temporarily stores various data. Keyboard 3-
1 is a keyboard for inputting information to the communication server 3, as will be described later. Reference numeral 24 designates a table registration instruction key, which will be described later, to instruct address registration processing in the memory 23. A registration end key 25 instructs to end the registration process in the memory 23.

[Terminal adapter configuration diagram (Figure 3)]] The third is LA
This is a configuration diagram of the terminal adapter 5 connected to the terminal adapter N, and the same parts as in FIG. 1 are indicated by the same symbols.

In the figure, 30 is a transmission/reception control unit that performs transmission and reception with the transmission path 4 within the LANT, and 31 is an interface j1. I.J.
It is a part. 32 controls the terminal adapter 5 and connects it to the LAN
The CPU controls the data in 7 and operates according to a control program stored in the ROM. 33 is CPU3
2, the memory serves as a work area for temporary storage of data, etc.

[Description of Address Registration Table (FIGS. 4 and 5)] FIG. 4 is a diagram showing an address registration table in the memory 23 of the communication server 3. As shown in FIG.

40 is the LA seen from the terminal device 2 of the packet switching network 1
N7 is the DTE address registration area of the terminal device, and 41 is the extension address registration area of the DTE in LAN7. By inputting these DTE addresses and extension addresses from the keyboard 3-1 and storing them in the memory 23, it is possible to send and receive information from the terminal device 2 that does not include an extension address.

FIG. 5 is a flowchart showing the table registration process from the keyboard 3-1.
It is stored in M.

This program is started when a key is input from the keyboard 3-1. First, in step S1, it is checked whether the table registration instruction key 24 has been pressed. If not, step S
Proceed to step 2 to execute other processing corresponding to the input key. When the table registration instruction key 24 is input, the process advances to step S3 and waits for the DTE address to be input. DT
When the E address is input, the process advances to step S4, and the DTE address is registered in the DTE address registration area 40 of the memory 23. It waits for the extension address to be input in step S5, and when the extension address is input, it is registered in the extension address area corresponding to the DTE address registered in step S4 (step S6).

In step S7, it is checked whether the registration end key 25 is pressed. If the button is not pressed, the process returns to step S3 and the above-mentioned circumferential movement is repeated. By pressing this registration end key 25, the address registration process in the memory 23 is ended.

[Description of operation for receiving incoming call packets (FIG. 6)] FIG. 6 is a flowchart showing the operation for receiving incoming call packets stored in the ROM of the CPU 22 of the communication server 3.

When an "incoming call" packet is received from the packet switching network 1, the process advances to step S10, where the "incoming call" packet is sent to the LAN 7.
Check whether the extension address is included. If an extension address is added, the process advances to step S15 and the data is sent to the LAN 7, but if no extension address is included, the process proceeds to step S15.
Proceed to tt and check if there is a registration table in memory 23 with the called DTE address. If there is no registration in step 512, the process proceeds to step S13, where error processing such as sending a communication failure message to the terminal device 2 is performed. memory 2
If the DTE address and its extension address are registered in the table No. 3, the process advances to step S14, and the extension address corresponding to the DTE address is added to the "incoming call" packet. Then, it is issued to the LAN 7 in step S15.

In the LAN 7, the terminal adapter 5 checks the extension address of the "incoming call" packet, captures the packet equal to the extension address of the connected terminal device 6, and sends it to the terminal device 6.
Send to. Due to this, you cannot enter the extension address.
Alternatively, communication between the terminal device 2 of the packet switching network 1 and the terminal device 6 of the LAN 7, which do not know the extension address, becomes possible.

As described above, according to this embodiment, a public network terminal that makes a call from a public network to a private network can make a call without being aware of the address on the private network.

[Effects of the Invention] As described above, according to the present invention, even if the address of the private network terminal within the private network is unknown from the viewpoint of the public network terminal, transmission and reception between the public network terminal and the private network terminal is possible. It has the effect of allowing you to do this.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a communication system according to an embodiment of the present invention, Fig. 2 is a block diagram of a communication server of this embodiment, Fig. 3 is a block diagram of a terminal adapter, and Fig. 4 (21 is a memory of the communication server). FIG. 5 is a flowchart of the extension address registration process using the keyboard, and FIG. 6 is a flowchart of the incoming call packet reception process of the communication server of this embodiment. In the figure, 1...Packet switching network, 2...Terminal equipment, 3
...Communication server, 3-1...Keyboard, 4...
Transmission path, 5... Terminal adapter, 6... Terminal equipment, 7
... LAN, 20... Transmission/reception control unit, 21... Interface control unit, 22... CPU, 23... Memory, 24... Registration instruction key, 25... Registration end key, 30 . . . transmission/reception control unit, 31 . . . interface control unit, 32 . . . CPU, 33 . . . memory. Patent applicant: Canon Co., Ltd. No. 1 Reason: Figure 2 Figure 5 Figure 6

Claims (1)

[Claims] A communication device that performs communication control between a public line network and a private line network, the apparatus comprising: means for inputting a first address of a terminal device of the private line network as seen from the public line network; A communication device comprising: means for inputting the second address of the terminal device; and storage means for storing the first and second addresses in association with each other.