JPH0479443A - Exchanging device - Google Patents

Abstract

PURPOSE:To switch the connection of lines without paying attention to the connection condition between a data terminal and an exchanging device by providing plural input/output ports connected to data terminals, a table means, and a means which detects input/output ports. CONSTITUTION:A table T1 has storage areas R1 to Rn where discrimination information of data terminals are held for respective input/output ports P1 to Pn. When receiving discrimination information from data terminals 12 to 17, an exchanging device 11 stores received discrimination information in data storage areas R1 to Rn corresponding to input/output ports. The input/output port which discrimination information of the destination data terminal designated by the transmission-side data terminal is stored in the storage area corresponding to is detected to determine the input/output port to which the destination data terminal is connected. Thus, each of data terminals 12 to 17 transfers data without paying attention to physical numbers of input/output ports of the exchanging device 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a switching device, and more particularly to a switching device that switches and controls connection lines between a plurality of data terminals.

(Prior Art) Generally, communication between data terminals is realized by a switching device that switches and controls connection lines between the data terminals.

As a method of line switching by a switching device, a method is often used in which the line number of the destination data terminal is given from the switching device to the source data terminal. this is,
The source data terminal or the destination pig terminal is specified by the line number indicating which input/output port of the switching equipment the destination data terminal is connected to.In this method, each data terminal is connected to the other data terminal. It is necessary to recognize the line number of the data terminal, that is, the physical human output port number of the switching equipment to which other data terminals are connected.

Therefore, if the input/output port number connected to the switching equipment changes due to data terminal relocation, etc., the line number will also change accordingly, and the data terminal will always be connected to the switching equipment's physical There was a problem where you had to be aware of the input/output port numbers.

Therefore, recently, a switching device has been developed in which a symmetrical table of input/output port numbers and data terminals is provided in the switching device and line switching is performed using this table. In this exchange system, each data terminal can specify the other party by the data terminal name without being aware of the physical input/output port number of the exchange device.

However, in conventional switching equipment, the contents of the table are manually registered in advance according to the connection status of the data terminal and the switching equipment, so whenever a data terminal is relocated or a port is changed due to a failure, the contents of the table are registered in advance. It was necessary to manually change the contents of the table.

(Problems to be Solved by the Invention) Conventionally, the contents of a table had to be changed manually when a data terminal was relocated, and an administrator had to constantly manage the connection status between the data terminal and the switching device. There were drawbacks.

This invention was made in view of these points, and it enables the contents of the table to be automatically updated when a data terminal is relocated, and allows line connection switching without being aware of the connection status between the data terminal and the switching equipment. The purpose is to provide a switching device that can perform the following.

[Structure of the Invention] (Means and Effects for Solving the Problems) A switching device according to the present invention is for switching and controlling connection lines between a plurality of data terminals, and is for switching and controlling connection lines between a plurality of data terminals. an input/output port, a table means provided for each input/output port with a storage area for holding terminal identification information assigned to each data terminal, and a table means for inputting terminal identification information from the data terminal. registration and updating means for registering the received terminal identification information in the storage area corresponding to the person output port and updating the table means when received through the output port, and referring to the table means; It is characterized by comprising means for detecting an input/output port to which a data terminal of a transfer destination is connected.

In this exchange device, the contents of the table means are automatically updated every time terminal identification information is transmitted from a data terminal. Therefore, even if a data terminal is relocated, it is possible to switch and control the connection line between the data terminals using only the terminal identification information, regardless of the relocation.

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

FIG. 1 shows a switching device according to an embodiment of the present invention. This switching device 11 switches and controls connection lines between data terminals in order to realize communication between a plurality of pig terminals, and has a plurality of input/output ports P1.
~Pn is provided.

Data terminals (DTE) such as information processing devices and various communication devices are connected to these input/output ports (PI to Pn), and in FIG. 1, for example, the data terminal 12 is connected to the first The data terminal 13 is connected to the second input/output port P2, the data terminal 14 is connected to the third input/output port P3, and the data terminal 15 is connected to the fourth input/output port P4. The data terminal 16 is connected to the m-th input/output port Pm, and the data terminal 17 is connected to the n-th input/output port Pn.

Data terminals 12-17 are each assigned unique identification information that is distinguished by device number, device name, or function name. Further, the switching device 11 is also assigned unique identification information indicating the device itself. Here, for the sake of simplicity, the identification information indicating the switching device 11 will be used as “S”.
"W", the identification information indicating the data terminal 12 is "A", the identification information indicating the data terminal 13 is "B", the identification information indicating the data terminal 14 is "C", the identification information indicating the data terminal 15 is "D" It is assumed that the identification information indicating the data terminal 16 is "Y" and the identification information indicating the data terminal 17 is "Z".

The switching device 11 connects desired data terminals by changing the connection between the outgoing capo, hPI, and Pn, and realizes communication between them. Ideku Capo-1-P ] ~
Connection switching between Pn's is executed using a table T1 provided in the switching device 11.

This table T1 includes a plurality of data storage areas R1 that hold identification information of data terminals connected to input/output ports P1 to Pn for each output port PL to Pn.
~Rn, indicating which data terminal is connected to which input/output port.

The contents of table TI are determined according to the own station number (identification information) included in the frame transmitted from each data terminal 12-]7. In other words, when the replacement bag (511) receives identification information from each data terminal 12 to 17 via the input/output port (≦), the received identification information is stored in the data storage areas R1 to Rn corresponding to the input/output port. The contents of table T1 are referenced to connect the originating data terminal to the destination data terminal when a data transmission request is made from the data terminals 12 to 17. It is detected which storage area corresponds to which human output port the identification information of the destination data terminal is stored, and thereby the input/output port to which the first data terminal is connected is determined.

In FIG. 2, between each data terminal 12 to 17 and the switching device 11,
Also, the configuration of frames exchanged between the data terminals 12 to 17 via the exchange device II is shown.

This frame includes a header field (H) 21, a transfer destination address field (DA) 22, a transfer source address field (SA) 28, and a control data field (C) 24.
, a transfer data field (1) 25, a frame check sequence field (FCS) 2 (il), and an end field (27).

Header field (H) 21 indicates the starting position of the frame for frame and bit synchronization. The transfer destination address field (DA) 22 indicates the device name of the communication partner, and identification information “A”, “B”, “Z” or “SW” is stored in the field (DA) 22. Ru. The transfer source address field (SA) 23 indicates the source device name, and the field (SA) 23 indicates the source device name.
A) Identification information “A”, “B”1, . . ., “Z” is included in 23.
” or “SW” is stored.

The control data field (C) 24 contains data between the switching device 11 and each data terminal 12 to 17, or between the data terminals 12 to 1.
Various control data for data transfer between the devices 7 and 7 are stored, for example, an identification information registration request command, a connection request command with a partner device, a disconnection request command, and the like. Transfer data field (1) 25 stores data transferred between switching device 11 and each data terminal 12-17 or between data terminals 12-17. Frame check sequence field (FCS) 2 (i is used for frame error detection. Also, end field (2
7) indicates the end position of the frame for frame and bit synchronization.

FIG. 3 shows a specific configuration of table T1. In addition to the identification information of the data terminals 12 to 17, this table T1 also includes information (status) indicating the line usage status by the data terminals 12 to 17 for each input port P1 to P1.
It is configured to be registered every n.

Next, the operation of the exchange device 11 will be explained.

First, an example of the operation of registering identification information in the table T1 will be described with reference to FIG. 4(A).

Here, the data terminal 12 to which identification information "A" has been assigned is connected to the human output port PI of the switching device 11, and the data terminal 13 to which identification information "B" has been assigned is connected to the human output port P2 of the switching device 11. Consider the case where it is connected to

As shown in FIG. 4(A), the data terminal 12 stores the identification information in the forwarding address field (DA) 22.
SW", identification information "A" is set in the transfer source address field (SA) 23, and registration command "Reg" is set in the control data field (C) 24.
The data is sent to input/output port P1 of. When the switching device 11 receives this frame, it registers identification information "A" indicating the data terminal 12 in the table TI as identification information corresponding to the human output port PL. When registration is complete, exchange device 1
1, 2 separate information “A” is set in the transfer destination address field (DA) 22, identification information “SW” is set in the transfer source address field (SA) 23, and response command “ACK” is set in the control data field (C) 24. The received frame is transmitted to the data terminal 12.

Similarly, the data terminal 13 also has identification information "SW" in the transfer destination address field (DA) 22 and transfer source address field (SA) 2, as shown in FIG. 4(A).
3, identification information “B”, control data field (C) 24
The frame in which the registration command “Reg” is set is sent to the input/output port P2 of the exchange device 11. When the exchange device 11 receives this frame, it indicates the data terminal 13 as the identification information corresponding to the input/output port P2. Identification information “B”
" is registered in the table T1. When the registration is completed, the switching device 11 stores identification information "B" in the transfer destination address field (DA) 22 and transfer source address field (SA) 2.
Identification information “SW” in 3, control data field (C) 2
A frame in which a response command "ACK" is set at 4 is transmitted to the data terminal 13.

In this way, registration of identification information in table TI is executed for each data terminal. Note that no identification information is registered in the storage area corresponding to the input/output port to which no data terminal is connected, and that portion is left blank.

Next, with reference to FIG. 4(B), the calling/receiving operation corresponding to data transfer from the data terminal 12 to the data terminal 13 will be explained.

As shown in FIG. 4(B), the data terminal 12 stores the identification information in the forwarding address field (DA) 22.
SW”, identification information “A” in the transfer source address field (SA) 23, connection request command “Con” and its connection destination “B” in the control data field (C) 24 are set in the exchange device 2 (11). It is sent to input/output port PL of. When the switching device 11 receives this frame, it sets the status corresponding to the human output port PL of the table TI to in use, and also determines which input/output port P2 the destination data terminal 13 with the identification information "B" is connected to. It is recognized by referring to table T1. Then, the exchange device 11
The status corresponding to the input/output port P2 is referred to, and if it indicates an empty state, identification information "B" is entered in the transfer destination address field (DA) 22 and identification information "SW" is entered in the transfer source address field (SA) 23. ”, a frame in which the connection request command “Con” and its connection partner “A” are set in the control data field (C) 24 is transmitted from the input/output port P2 to the data terminal 13, and the status corresponding to the input/output port P2 is transmitted. Set while in use.

Here, as shown in FIG. 4(B), the data terminal 14
Identification information “S” is placed in the forwarding address field (DA) 22.
W”, identification information “C” in the transfer source address field (SA) 23, connection request command “Con” and its connection destination “B” in the control data field (C) 24 are input/output from the switching device 11. Let's consider the case where the data is sent to P3 (capo).

At this time, the switching device 11 refers to the table T1 and recognizes that the data terminal 13 with the identification information "B" is connected to the input/output port P2 and that the input/output port P2 is in use. . For this reason, the exchange device 11
Identification information “C” is entered in the forwarding address field (DA) 22.
”, the transfer source address field (SA) 23 contains the identification information “SW”, the control data field (C) 24 contains the command “Busy” indicating that it is in use, and the identification information “B” indicating the data terminal in use. The set frame is transmitted to the data terminal 14 from the input/output port P3, and the data terminal 14 is notified that the data terminal 13 is in communication.

A response signal to the connection request, that is, a transfer destination address field (DA
) 22 shows the identification information "SW", the transfer source address field (SA) 23 shows the identification information "B", and the control data field (C) 24 shows the command "ACK" indicating a response to the connection request and the request source. Identification information “
A frame in which "A" is set is transmitted.Similarly, a response signal to the connection request, that is, a transfer destination address field (DA) 2 is sent from the switching device 11 to the data terminal 12.
2 contains identification information “A” and transfer source address field (SA
) 23 contains identification information “SW” and control data field (C
) 24, a frame is transmitted in which a command "ACK" indicating a response to the connection request and identification information "B" indicating the source of the response are set.

In this way, the lines between data terminal 12 and data terminal 13, that is, input/output ports P1 and P2, are connected.

Next, actual data transfer between the data terminal 2 and the data terminal 13 will be explained with reference to FIG. 4(C).

When input/output ports P1 and P2 are connected,
A frame transmitted from the data terminal 12, that is, identification information “B” in the transfer destination address field (DA) 22 and identification information “A” in the transfer source address field (SA) 23
, a frame in which predetermined transfer data is set in the transfer data field (1) 24 is transferred as is to the data terminal 13 via the switching device 11. In addition, the frame sent from the data terminal 13, that is, the destination address field (DA) 22 has identification information "A", the source address field (SA) 23 has identification information "B", and the transfer data field (1). The frames in which predetermined transfer data is set in 24 are also transferred as they are to the data terminal 12 via the switching device 1.

Next, the line disconnection operation will be explained with reference to FIG. 4(D).

When the data transfer is completed, the data terminal 12 transfers the data as shown in FIG.
As shown in D), the destination address field (DA) 2
2 contains identification information “SW” and transfer source address field (S
A) Identification information “A” in 23, control data field (C
) 24 with a disconnection request command “Dis” set thereto is sent to the switching device ]1. Similarly, data terminal 1
3, as shown in FIG. 4(D), the transfer destination address field (DA) 22 contains identification information "s w", the transfer source address field 1' (SA) 23 contains identification information "B", and the control data field. (C) At 24, disconnection request command “D
is” is set to the switching device 1].

Upon receiving these frames, the switching device 11 disconnects the connection between the input/output ports P1 and P2 and changes the status corresponding to each of the input/output ports P1 and P2 in the table T1 from in use to free. At the same time, identification information “A” is placed in the transfer destination address field (DA) 22, and identification information “sw” is placed in the transfer source address field (SA) 23.
", command ACK indicating a response to the disconnection request" is set in the control data field (C) 24, and identification information "B" is set in the transfer destination address field (DA) 22. The data terminal 1 receives a 7-frame frame in which identification information “sw” is set in the original address field (SA) 23 and a command “ACK” indicating a response to a disconnection request is set in the control data field (C) 24.
Send to 3.

As explained above, in the switching device 11 of this embodiment, when an identification information registration command is transmitted from the data terminals 12 to 17, the identification information is automatically registered in the table T. Therefore, when the data terminal is relocated to another person's output port, the contents of table T1 are automatically updated in accordance with the relocation.

Therefore, each of the data terminals 12 to 17 can transfer data without being aware of the physical input/output port numbers of the switching device 11.

[Effects of the Invention] As described above, according to the present invention, the contents of the table can be automatically updated when a data terminal is relocated, and the line can be updated without being aware of the connection status between the data terminal and the switching equipment. It becomes rσ capability to perform connection switching.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a switching device according to an embodiment of the present invention, FIG. 2 is a diagram showing the data structure of a frame transferred by the switching device shown in FIG. 1, and FIG.
FIG. 4 is a diagram showing an example of the configuration of a table provided in the switching device shown in the figure, and is a diagram for explaining the operation of the switching device shown in FIG. 1. 11... Exchange device, 12-17... Data terminal, P
1~Pn...Person output port, T1...Table.

Claims (1)

[Scope of Claims] A switching device that switches and controls connection lines between a plurality of data terminals, which retains a plurality of input/output ports to which the data terminals are connected, and terminal identification information assigned to each of the data terminals. table means having a storage area provided for each of the input/output ports; when receiving terminal identification information from the data terminal via the input/output port, the received terminal identification information is stored in the input/output port; A registration update means for registering in the corresponding storage area and updating the table means; and a means for referring to the table means to detect an input/output port to which a data terminal of a transfer destination is connected. An exchange device characterized by: