JPH02207634A - Repeater - Google Patents

Abstract

PURPOSE:To connect an interval between necessary segments by the data of an initial setting means by providing a reception gate means to open a reception route from the correspondent segment based on a segment select signal and a transmission gate means to open a transmission route to the correspondent segment based on a destination instruction signal and the segment selecting signal. CONSTITUTION:A repeater controller 202 is equipped with a segment selecting means to receive the data, which are given from the initial setting means, and to output the segment selecting signal and a destination instructing means to instruct the destination segment of the data based on the data sent from the segment through a receiver 203. The reception gate means is provided to open the reception route from the correspondent segment based on the segment selecting signal and the transmission gate means is provided to open the transmission route to the correspondent segment based on the segment selecting signal and destination instruction signal. Thus, the relation of the connection is generated between the segments in the data given by the initial setting means and the various connection relation can be realized.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a repeater that divides a transmission path of a local area network (LAN) system into a plurality of segments and relays between these segments. be.

[Conventional technology]

In response to a wide variety of demands, modern LAN systems are not only constructed using transmission lines that are connected in a certain way, but sometimes certain terminals are separated to form a system, and other times two systems of transmission lines are constructed. There is a growing demand for things that can be changed, such as configuring systems as if they exist. In order to configure such a LAN system, it is possible to divide the transmission line into several segments and connect the required segments as appropriate, but a repeater exists as a device that connects these segments. . This conventional NoriPeak simply performs relaying and only has an amplification function.

[Problem to be solved by the invention]

In this way, conventional repeaters simply perform relaying, so even if they are used to connect segments,
When changing the system configuration, it is necessary to change the connection relationships of the actual transmission lines, and LA
This method could not be applied to the N system.

SUMMARY OF THE INVENTION An object of the present invention is to provide a repeater that can be used to divide a transmission line into a plurality of segments and connect the required segments as appropriate to construct LAN systems having various forms.

[Means to solve the problem]

The repeater according to the present invention is a repeater that divides a transmission path of a local area network system into a plurality of segments and relays between these segments, and connects any of the segments from initial setting means provided in the system. segment selection means for receiving data indicating a segment selection signal and outputting a segment selection signal; reception gate means for opening a reception path for data from the corresponding segment based on the segment selection signal; Destination instructing means for outputting a destination instructing signal for instructing the destination segment of the data based on the data; and transmission gate means for opening a data transmission route to the corresponding segment based on the destination instructing signal and the segment selection signal. It is characterized by:

[Effect]

Since the repeater according to the present invention is configured as described above, by giving the required data from the initial setting means, it is possible to receive data from between the required segments.
The data sent from this required segment via the corresponding receiving gate instructs the destination and opens the transmission path to the corresponding segment within the required segment. Connection relationships occur between segments, and various connection relationships can be realized.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS A repeater according to an embodiment of the present invention will be described below with reference to FIGS. 1 and 2 of the accompanying drawings.

FIG. 2 shows a conceptual diagram of the repeater of the present invention.

To simplify the explanation, this repeater is configured to relay two segments, A and B, into which the transmission path is divided. This repeater is OS I (Open S
Of the seven layers established by system interconnection, the physical (PHY) layer and MAC (
It has a Medla Access Control layer and sends data received from one segment to the other segment. The MAC layer consists of a MAC section 201, and the physical layer consists of a repeater controller 202, a receiver 203 . 203 , a transmitter 204 .204 , which is part of the transmission gate A B means. It consists of 204B.

In addition, the system is provided with initial setting means. The initial setting means is provided in the master station of the network and sends the data of the segment to be connected to the MAC section 201 via the transmission path. is established using the following method. The MAC unit 201 performs appropriate transmission depending on the transmission method adopted in this system (for example, C3MA/CD applied to bus-type transmission lines, token passing applied to bus-type and ring-type transmission lines, etc.). The repeater controller 202 is controlled so that transmission can be performed. Note that the MAC unit 201 receives data from the repeater controller 202 and performs control.

The repeater controller 202 includes segment selection means that is configured together with the MAC section 201 and that receives data given from the initial setting means and outputs a segment selection signal, and a segment receiver 203.
A destination instructing means is included for outputting a destination instructing signal indicative of a destination segment of the data based on the data sent via the destination. The repeater controller 202 also includes a part of a reception gate means which opens a receiving path for data from a corresponding segment based on a segment selection signal sent from the segment selection means, a segment selection signal sent from the segment selection means and a destination instruction. A portion of transmission gate means is included for opening a transmission path for data to a corresponding segment based on a destination indication signal sent from the means.

In such a system, when the MAC section 201 implements a token passing transmission method, the segment selection means and the reception gate means connect segment A and segment B using data from the initial setting means. After that, upon receiving the data sent from one of the segments, the destination instructing means controls the sending gate means so that the data is sent to a segment different from the sending source, thereby preventing data collision. do.

FIG. 1 shows a more detailed configuration of the repeater described above, and a repeater that connects three or more segments. In this embodiment, it is assumed that the MAC unit 101 performs control corresponding to a token passing transmission method on a bus-type transmission path. Gates 105 and 106 are connected to the receiver 103 and the transmitter 104, respectively, the gate 105 is opened by a segment selection signal output from the segment selection unit 107, and the gate 106 is
Segment selection signal output from 7 and destination instruction section 10
AND gate 110 with the destination instruction signal output from 8.
It is opened by the logical OR signal. interface 1
09 performs processing related to data transmission and reception (code conversion, etc.) between the MAC unit 101, receiver 103, and transmitter 104, together with gates 105 and 106. In this embodiment, the initial setting means is provided in the segment A master station (not shown). It is also assumed that the gate 105 is opened by the segment selection signal output by the segment selection section 107 under the control of the MAC section 101 from the time the system is started up.

The repeater of FIG. 1 configured in this way operates as follows. When the system is started up, the initial setting means of the master station (network manager) sends data on segments to be connected. This data is sent to receiver 1
03 Reach interface 109 via gate Aゝ105A, and connect to MAC
It is converted into a symbol (a code in the required format) and sent to the MAC unit 10.
1. Based on the provided data, the MAC section 101 provides data indicating which segment to select to the segment selection section 107. Segment selection section 1
07 sends a segment selection signal to the gate 105 and AND gate 110 connected to the required segment in accordance with the applied data. This means that a transmission path through which data is transmitted to the repeater is formed.

Therefore, data is sent from the terminal of a certain segment, and this data is sent to the receiver 103 and the gate 105.
The signal reaches the interface 109 via the MAC symbol, is converted into a MAC symbol, and is sent to the MAC section 101. MAC section 1
01 is determined by the transmission method adopted by the system and the data sent by the initial setting means (
Data indicating which gate 106 should be opened is provided to the destination instruction unit 108 by referring to a data memory table (indicating which segment data sent from a certain segment should be sent to). As a result, the destination designation section 108
provides a destination indication signal to the corresponding AND gate 110 and opens the gate 106 connected thereto. The above data is returned by the interface 109 or the MAC unit 101 and sent to the corresponding segment via the transmitter 104 with the gate 106 opened.

Here, as to which segment the data is sent from, for example, a method such as adding a header when receiving the data by the receiver 103 or transmitting by the transmitter 104 can be adopted. This is because when data sent from a certain terminal first arrives at this repeater, the source terminal and segment match, but when data repeatedly arrives at this repeater more than once to pass through several segments, This is because the sent segment and the source do not match. Since it takes time for the MAC unit 101 to determine from which segment the data is sent and to return the data, a FIFO type buffer is provided in the MAC unit 101 or the interface 109.

Note that since the gates 105 and 106 leading to segments not selected by the initial setting means remain closed, neither transmission to this segment nor data reception from this segment is performed.

The present invention is not limited to the above embodiments, and various modifications are possible.

For example, since the above embodiment assumes bus-type token passing, it is necessary to determine the destination segment based on the condition that data sent from a certain segment should be sent to the next predetermined segment. However, for example, in a LAN system such as the CSMA/CD system that detects collisions and adjusts transmission rights on the transmission path, data is transmitted including the segment from which the data was sent. It is modified to perform transmission control such as

Furthermore, the data included in the initial setting means that indicates which segments should be connected is not limited to one, but is provided in several pieces. Therefore, it is possible to construct a system in which a segment is selected at a certain time and is separated, or in which a plurality of buses are provided. Theoretically, there is no limit to the number of segments, and even if there is only one repeater, initial setting means can be provided remotely and various systems can be constructed by remote sweeping.

〔Effect of the invention〕

As described in detail above, in the present invention, the segments of the transmission line divided into a plurality of segments are specified by data sent from the initial setting means and connected via the reception gate means, and In this connected state, data sent from a predetermined segment is sent to the predetermined segment via the transmission gate means. Therefore, it is possible to appropriately connect required segments using the data of the initial setting means. The present invention is suitable for constructing LAN systems having various forms in which data transmitted between segments is sent from one predetermined segment to another.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a detailed configuration of a repeater according to an embodiment of the present invention, and FIG. 2 is a diagram showing the concept of a repeater according to an embodiment of the present invention. 101.201...MAC section, 103,203...
Receiver, 104, 204... Transmitter, 105°106
... Gate, 107 ... Segment selection section, 108
... Destination instruction section, 109 ... Interface, 20
2... Repeater. Figure 2 Patent applicant Sumitomo Electric Industries, Ltd.

Claims (1)

[Claims] 1. In a repeater that divides the transmission path of a local area network system into a plurality of segments and relays between these segments, which segments are connected from initial setting means provided in the system? segment selection means for receiving data indicating a segment selection signal and outputting a segment selection signal; reception gate means for opening a reception path for data from the corresponding segment based on the segment selection signal; destination instruction means for outputting a destination instruction signal indicating a destination segment of the data based on the received data; and transmission gate means for opening a data transmission route to the corresponding segment based on the destination instruction signal and the segment selection signal. A repeater characterized by being equipped with.