JPH058898B2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention connects various local area network LANs used in office information system OA and factory information system FA to a private branch exchange PBX that handles telephone calls and data. It relates to integrated information and communication networks.

(Conventional technology and problems) Conventionally, distributed control LANs, which had their own switching functions, had a different switching control method from centrally controlled PBXs, so these LANs and PBXs could not be directly connected. , it was only possible to connect via a gateway device. Therefore, users are
Communication within the LAN and communication outside the LAN via a gateway had to be handled differently in terms of partner selection methods, etc. Furthermore, the processing time at the gateway and the price of the gateway were also problems. On the other hand, a LAN, which does not have any exchange function by itself,
It was possible to configure a single network in combination with a PBX, but in this case, between information processing devices and terminal devices (in this specification referred to as information processing devices, hereinafter referred to as DTE) connected to the same LAN, All communication is also done through the PBX, so the PBX
The load was concentrated on the computer, and its processing capacity was often a problem.

The present invention directly connects a distributed control type LAN and PBX, and controls the connection disconnection using the PBX.
By using the LAN function for information communication between DTEs, it provides an integrated information communication network with a unified usage method without placing a large load on the PBX.

(Means for Solving the Problems) According to the present invention, a centrally controlled exchange (hereinafter referred to as an exchange), an information processing device directly connected to a subscriber line of the exchange, and a distributed control type exchange In an information communication network consisting of information processing devices connected via a local area network, a subscriber number managed by the exchange is assigned to each information processing device, and each information processing device is connected to the local area network. The information processing device
means for sending a call request packet and a disconnection request packet specifying a subscriber number of an information processing device of a communication partner to the exchange via a local area network; and a local area network address displayed on the exchange. A means for receiving a call completion notification packet or an incoming call notification packet via a local area network, and a means for receiving the call completion notification packet or the incoming call notification packet after the connection with the other party's information processing device is completed due to the outgoing or incoming call. means for transmitting and receiving information packets using the destination local area network address indicated in the incoming call notification packet; If both incoming call information processing devices belong to the same local area network, they each share the local area network address of the other party's information processing device, and if both belong to different local area networks or if the other party is directly connected to the exchange, An information communication network is obtained which includes means for displaying the local area network address of the exchange in the call completion notification packet or the incoming call notification packet when the call is received.

Further, according to the present invention, the information communication network can make the information packet transmission procedure determined by the exchange completely the same between the transmitting information processing device and the exchange, and between the exchange and the receiving information processing device, so that An information communication network that executes this unified procedure can be obtained without using an exchange between information processing devices, but via an exchange between different local area networks or between information processing devices directly connected to an exchange.

(Function) According to the information communication network of the present invention, connection disconnection is centrally controlled by the PBX, so network users can centralize their selection of partners using the PBX subscriber number. There is no need to know the LAN address of the In addition, information transfer after connection uses the exchange function of the LAN if it is within the same LAN, making it possible to avoid concentrating the load on the PBX. Furthermore, the information packet transmission and reception procedure is
It is the same between the sending DTE and PBX, and between the PBX and receiving DTE, so each DTE has its own
All procedures higher than the link level procedures specified by LAN can be made the same regardless of the destination, and the switching functions provided by PBX enable network construction using not only packet switching but also circuit switching. .

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an example of a network realized by the present invention. Figure 2 is the first
FIG. 3 is a diagram illustrating means for implementing the present invention in a DTE connected to the LAN in the figure, and FIG. 3 shows a means for implementing the present invention in a PBX. Figure 4 is similar to Figure 5 and 6.
This is a diagram for explaining the position of the procedure shown in the figure. Figures 5 and 6 are examples of the procedure, and Figure 7 is a description of the procedure shown in Figures 5 and 6. It is a figure explaining a method.

OSI (OPEN
This section explains the procedure for using this network in correspondence with the SYSTEM INTER CONNECTION) model. The physical level and link level procedures (protocols) are the procedures specified for each LAN in the case of LAN, and the X.21 physical level and HDLC in the case of lines.
Use procedures. In addition, for procedures beyond transport, procedures defined by OSI or procedures based on the network architecture defined by each company can be applied. Since these procedures are not directly related to the present invention, their explanation will be omitted. The steps explained below are
This procedure corresponds to the network level of the OSI model.

Referring to Figure 7, the meaning of the procedure descriptions used in Figures 5 and 6 is that the first term represents the type of packet, and the second term represents the LAN to which the packet is sent.
The third term of the address (link level address) is additional information defined for each packet type. Of course, in the actual procedure, in addition to this information, information such as own LAN address, own subscriber number, and logical channel number to be used is also required, but these are well-known matters that are not directly related to the present invention ( For example, CCITT, X25 procedure, etc.), so it will be omitted to simplify the explanation.

The procedure for communicating between DTE1 and DTE2 in FIG. 1 will be explained using FIG. 5.
When information to be sent to DTE 2 is generated in DTE 1, call disconnection packet sending means 3 is activated by information packet transmitting/receiving means 4 shown in FIG. This is Figure 5, where the outgoing packet is
Sent to LAN address 00, i.e. PBX,
It shows that the connection partner is number 0002.
When this packet is received by the PBX's LAN access means and basic exchange means 6, the DTE-LAN in Figure 3
DTE1 and 0002 by address management means 7.
DTE (DTE2) belongs to the same LAN and has number 0002.
It is determined that the LAN address is 02 and the LAN address of DTE1 is 01. The result is the same
Since the communication is within the LAN, the basic exchange means knows that there is no need to set up an information exchange path on the PBX,
Also, the incoming call packet is assembled by the LAN address display means 9 and sent to the DTE 2 via the LAN access means 8.
sent to. This is Figure 5, where the destination of the incoming call packet is LAN address 02, indicating DTE2,
This shows that the LAN address of the communication partner of DTE2 is 01. When the incoming call notification and call completion notification packet receiving means 2 of the DTE 2 receives the issued call acceptance packet, the LAN address management means 7 of the PBX sends a call completion packet (FIG. 5) to the DTE 1. shows that the LAN address of DTE2 is 02 for DTE1. When the DTE 1 receives this call completion packet, the call completion notification packet receiving means 2 shown in FIG. 2 is activated and notifies the information packet transmitting/receiving means 4 that subsequent information transfer can be performed using LAN address 02. The information packet transmitting/receiving means 4 assembles the information packet into an address.
02 and send it out (Figure 5). On the other hand, in the DTE 2, the same thing is done by the incoming call notification packet receiving means 2, and communication is started using address 01 (5th call notification packet receiving means 2).
figure). In this way, information packets within the same LAN are directly transmitted and received within the LAN without going through a PBX. When terminating communication, a disconnection packet is sent.
The packet is sent to the PBX (Figure 5), and the PBX also sends a disconnect packet to the other party (Figure 5), terminating the communication. If a connection request is received from another DTE during communication, the PBX sends a busy notification to that DTE.

FIG. 6 shows the procedure when DTE1 and DTE4 in FIG. 1 communicate. In this case, the communication is between different LANs, so the basic exchange means 6 in Figure 3 is
Set a path for exchanging information packets from DTE1 to LAN2. Also, incoming call packet (Figure 6)
The destination LAN shown in the call completion packet (Figure 6)
The addresses indicate LAN addresses 02 and 00 of the PBX in each LAN. For this reason, information packets are sent and received via the PBX (Figure 6,
). In the case of exchanging a line with a DTE connected to the LAN, the line access means 5 of the PBX performs the exchange.

Although the details of the information packet transfer procedure are omitted in the above explanation, for example, the well-known CCITT
X25 data procedures can be used. This procedure is exactly the same between the sending DTE and PBX and between the PBX and receiving DTE. Using such a procedure, if all the DTEs in Figure 1 implement the physical level and link level procedures for the LAN or line to which they belong, it is possible to make all procedures at the network level and above the same procedure. be. Furthermore, even if the basic switching function in the PBX is circuit switching, this procedure can be executed between DTEs, so it is possible to make it possible to do it regardless of whether the basic switching function in the PBX is packet switching or circuit switching.

One embodiment of the present invention has been described above, but for example
By adding a logical channel number in addition to the LAN address and managing the LAN address + logical channel number in the same way as the LAN address in the example above,
It is understood that expansions such as allowing DTE to communicate with multiple parties at the same time are possible without changing the LAN functions.

(Effect of the invention) As explained above, according to the present invention, LAN and
The PBX can be directly connected, connection disconnection control can be performed centrally on the PBX, and information can be transferred within the same LAN without going through the PBX, making it possible to utilize the LAN's switching function, making it possible to transfer information to the PBX at low cost (no gateway required). Information communication that avoids load concentration on the network, allows each DTE to communicate only by knowing the other party's subscriber number without knowing the other party's LAN address, and allows all DTEs to perform the same procedures at the network level or above. network becomes possible.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram of a DTE connected to the LAN shown in FIG.
FIG. 3 is a block diagram showing means for implementing the present invention in a PBX. Figure 4 is a diagram for explaining the level of the procedures shown in Figures 5 and 6, and Figure 5 shows an example of the procedure when communicating between DTEs within the same LAN. Figure and Figure 6 are different.
FIG. 3 is a diagram illustrating an example of a procedure when communicating between DTEs belonging to a LAN. FIG. 7 is a diagram illustrating a method of describing the elements of the procedure used in FIGS. 5 and 6. In the diagram, PBX is a centrally controlled exchange, DTE
indicates information processing equipment or terminal equipment, LAN indicates distributed control local area network, the number above DTE indicates the address in LAN, and the number below DTE indicates the subscriber number in PBX. . 1 and 8 are LAN access means,
2 is an incoming call notification and call completion notification packet receiving means;
3 is a call disconnection packet sending means, 4 is an information packet transmitting/receiving means, 5 is a line access means, 6 is a basic exchange means, 7 is a DTE-LAN address management means,
9 is a LAN address display means.

Claims (1)

[Claims] 1. A centrally controlled switch (hereinafter referred to as the switch);
In an information communication network consisting of an information processing device directly connected to a subscriber line of the exchange and an information processing device connected to the exchange via a distributed control local area network, the management of the exchange A subscriber number is assigned to each information processing device, and the information processing device connected to the local area network transmits a call request packet and a disconnection request packet specifying the subscriber number of the information processing device of the communication partner to the local area network. means for transmitting the call to the exchange via the area network; and means for receiving the call completion notification packet and the incoming call notification packet having the local area network address displayed on the exchange via the local area network; After the connection with the other party's information processing device is completed by making or receiving a call, means for transmitting and receiving information packets using the other party's local area network address indicated in the call completion notification packet or the incoming call notification packet; The exchange has a means for managing the local area network address of each information processing device, and a means for managing the local area network address of each information processing device, and a means for managing the local area network address of each information processing device, and a means for managing the local area network address of each information processing device when both the calling and called information processing devices belong to the same local area network. If both parties belong to different local area networks, or if the other party is directly connected to the exchange, the local area network address of the exchange is sent to the call completion notification packet or the incoming call. an information communication network having means for displaying on a notification packet. 2. In the information communication network, the information packet transmission procedure determined by the exchange is exactly the same between the transmitting information processing device and the exchange, and between the exchange and the receiving information processing device, and the information packet transmission procedure specified by the exchange is 2. The information communication network according to claim 1, wherein the unified procedure is executed between different local area networks or between information processing devices directly connected to an exchange via an exchange, without using an exchange.