JPS62220046A - Repeating installation - Google Patents

Abstract

PURPOSE:To extend simply repeating ports by constituting the title repeating installation as a repeating node to a host node, applying loopback connection by the 1st changeover means to function the node as a center repeating node. CONSTITUTION:The 1st changeover means S1 applying loopback connection of an incoming line 50 to a host device to a distribution means 14, and connection terminals 15, 16 which one set of lines are connected respectively to a control means 13 and the distribution means 14 are provided and the 2nd changeover means S2, S3 connecting a host port 12 to the connection terminals 15, 16 respectively are provided. The 1st changeover means applies loopback repeating to the line from a subordinate device to the said subordinate device and the 2nd changeover means uses the host port 12 as a subordinate port 11. Thus, one set of subordinate ports are extended to the center relay node.

Description

[Detailed Description of the Invention] [Summary] In a relay device of a star-type line network, a first switching means is provided for loop-back connection of a line inside the relay device that relays to a higher-level device, and this switching means performs loop-back relay. In addition to being used as a central relay device, the device is provided with means for using the upper port, which is no longer needed due to the above switching, as a lower port by means of a second switching means.

[Industrial application field]

The present invention relates to an improvement in a relay device in a star line network.

A star line network, in which lines are configured in a star shape via relay equipment, is a local area network (Local area network).
Cal Ar1a Network; LAN).

As shown in FIG. 3(a), this network connects terminal nodes (Nl-
N8) is used to connect and communicate with each other,
It is composed of a central relay node 3 of Lm that relays back and a plurality of relay nodes la and 2a (hereinafter simply referred to as relay nodes to be distinguished from central relay nodes) that relay to upper nodes.

These relay nodes and central relay nodes are required to easily connect terminal nodes dispersed in each area and to be able to flexibly cope with increases and decreases in the number of terminal nodes. A relay device having the same configuration as a relay node and a central relay node is used as a relay node and a central relay node.

The number of lower ports mentioned above was set to be compatible with various systems and to be inexpensive, but there are cases where it is desirable to have a margin in the number of lower ports due to the network configuration, and it is necessary to easily solve this problem. It is being

[Conventional technology]

The equipment configurations of the relay nodes and central relay nodes in the star network are shown below.

(Configuration of relay node) FIG. 3(b) shows the relay node [FIG. 3(a)-18,1
b, etc.], which has a function of concentrating lines from a lower node and connecting them to an upper node, and a function of distributing lines from the upper node to the lower nodes. In the figure, 6a to 6n are lower ports, which are composed of connectors that connect up and down lines with lower nodes, and 7 are upper ports, which are connectors that connect up and down lines with upper nodes. 5 is a control unit, which has the function of concentrating multiple uplinks from lower nodes 6a to 6d, shaping received signals and transmitting them to upper nodes, and signals from lower nodes. When the collision occurs,
A distribution unit 8 has a function of transmitting a predetermined collision signal to the upper node, and distributes the downlink from the upper node to each of the lower ports 6a to 6n.

(Configuration of central relay node) Central relay node shown in Figure 3 (C) [Figure 3 (13)
-3], the control unit 10 (same configuration as the control unit 5) concentrates the lines from a plurality of lower nodes connected via the lower ports 9a to 9n (same configuration as the control unit 5), and , which has a return function to distribute the output to the lower ports 9a to 9n via the distribution unit 11 (same configuration as the distribution unit 8), and has a function to return the line from the lower node and distribute it to the lower nodes. It is.

(Relay operation) The above relay nodes and central relay node are shown in Figure 3(a).
A star network is constructed by connecting as follows.

Now, when terminal node N1 transmits data to any of terminal nodes N2 to N8, terminal node N1 sends a frame with the address of the destination terminal node to relay node 1a.
Send to.

The relay node 1a formats the signal and sends it to the upper relay node 2a, and the relay node 2a similarly sends the signal to the central relay node 3.
Send to.

The central relay node 3 returns the signal to the relay node 2.
a, 2b, and the relay nodes 2a, 2b further distribute the signal to lower nodes.

As a result, the frame sent by the terminal node N1 is transmitted (broadcast) to all the terminal nodes N1 to N8, and the terminal node at the above address receives it.

Note that when frames collide at a relay node, a collision signal is broadcast, and the transmitting terminal node confirms this and performs communication again.

[Problems to be Solved by the Invention] The configuration of the network described above depends on the number of lower ports as well as the number of areas and terminal nodes.

However, in order to accommodate various network sizes, relay nodes and central relay nodes are equipped with about 3 to 4 lower ports, and increasing the number of lower ports each time requires expensive equipment. There is a problem.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a relay device that can easily add lower ports.

[Means for solving problems]

For the above purpose, the relay device of the present invention, as shown in FIG. 1, a diagram explaining the principle of the present invention, includes a first switching means for connecting the uplink (50) to the upper bag π back to the distribution means. (S1), connection terminals (15, 16) for connecting 1&ll lines to the control means and the distribution means, respectively, and the upper port (12)
second switching means (S2
．． S3), the first switching means relays the line from the lower-order device back to the lower-order device, and the second switching means uses the upper port (12) as a lower-order port.

[Effect]

The relay device is configured as a relay node to an upper node, and is connected back by the first switching means to function as a central relay node.

Further, the unused upper port is used as a relay port of the lower node, that is, a lower port.

Therefore, the control means and the distribution means are each provided with 1) Jl connection terminals, and second switching means are provided to connect these connection terminals and the upper port, respectively.

As a result, a set of lower-order ports is added to the central relay node.

As described above, the relay node and the central relay node can be configured as the same relay device, and when switching to the central relay node, one set of lower ports can be added by simple means.

〔Example〕

An embodiment of the present invention will be described with reference to FIG.

FIG. 2(a) is a block diagram of the relay device of the embodiment, and FIG.
b) shows a diagram showing an example of a network configuration.

FIG. 2(a) includes four sets of lower ports lla to lid, which are composed of connectors of the same structure, each containing one set of receiver RV and one set of transmitter DV, and one set of upper port 12. This figure shows an example of a relay device.

The switch S1 is the first switching means, the switch S2 is the second switching means. Connect S3 as shown in the figure, and when using it as a relay node, connect it to the contact a side,
When used as a central relay node, switch to the contact side.

Since the receiving section RV and the transmitting section DV are built into the respective connection connectors, the above-mentioned distribution section 14 connects the four sets of lower ports 1-11a to DV26 to 29 of the lower ports 1-11a to lid and the upper ports 12(7) and RV25, The control section 13 and the distribution line 52 are each provided with an additional terminal 15, 16.

The control unit 13 is composed of an OR gate 31 that concentrates the outputs of the receiving units RV21 to 24, a collision determination unit 32, a collision signal generation unit 33, a multiplexer MPX34, etc. The signals received by the RV21 to 24 are sent to the OR gate )31r
When the signals are concentrated and input to the collision determination unit 32, and the collision determination unit 32 detects two or more sets of signals at the same time,
If the MPX 34 is switched and the collision signal generator 33 outputs a predetermined collision signal, and no collision is detected,
The received signal is output from the OR gate 31.

With the above configuration, the switches Sl, 32, 33 are switched in a predetermined direction and used as a relay node and a central relay node.

(When used as a relay node) When set on the contact a side as described above, it functions as a relay node. That is, the outputs of RV21 to RV24 are ORed by OR gate 31, connected to DV30 of upper port 12 via S'l-a, and then connected to the upper node.

On the other hand, the signal received by RV25 from the upper node is 53
-a to each of the DVs 26 to 29 and broadcast to lower nodes.

(When used as a central relay node) Figure 2 (al
As shown by dotted lines in , each switch sl, s2 . ．． s
: Switch 3 to contact b (in the direction of the arrow shown).

When the contact of the switch S1 is switched from 5L-a to contact 5t-b, the concentrated uplink line 50 is connected to the distribution line 52 via 51-b, and is connected back and operates as a central relay node.

On the other hand, switch S2. By switching S3, the upper port 12 (7) DV30 connects to the contact 52-b, and the distribution line 5
2, and the RV25 is connected to the contact 53-b.
is connected to the additional terminal 15 of the control section 13.

As a result, the upper port 12 is connected to the lower ports 11a to li.
It can be used as a relay port equivalent to d.

That is, the outputs of the five sets of RVs 21 to 24 and 25 are condensed by the OR gate 31, and distributed to the five sets of folded DVs 26 to 29 and 30 via 51-b, and sent to the lower node.

As described above, the relay device shown in FIG. 2(a) can be switched as a relay node or a central relay node using the switch Sl, and when both are used as the central relay node, the switches S2 and S3 are further switched. hand,
Upper port 12 is used as a lower port. Therefore, S
1, 32, and 33 may be configured to be switched in conjunction with each other.

FIG. 2(b) shows an example of a network configured using the above-mentioned relay devices, in which the relay nodes 37 to 40 have switches 31. S2. In S3, as shown in FIG. 2 (al), the contacts are switched to the a side, and each switch of the central relay node 41 is switched to the b side.

In the above configuration example, in a conventional relay node having four sets of relay ports, the terminal node is 16 of N l −N 16.
However, in the present invention, one set of relay ports is added to the central relay node, so that the terminal node 17 or the relay node can be connected.

The above effect is not limited to the addition of one terminal node; for example, when adding a terminal node under the relay node 40, conventionally it is necessary to provide the relay node 42, which increases the number of three sets of relay ports. However, as the number of layers of relay nodes increases, reliability decreases.

However, if a relay node is connected to the added relay port of the present invention, four sets of relay ports can be added without increasing the number of layers.

As explained above, the first switching means S1 and the second switching means 82.3 are connected and provided as shown in FIG. The device can be used as a central relay node for return relay, and the upper port that is no longer needed can be used as a lower port.

〔Effect of the invention〕

As explained above, the present invention configures a central relay node and a relay node as the same relay device, provides each function with a switching means, and when a central relay node is configured, an upper port is used as a lower port. It is equipped with a switching means to be used, and the effect of easily adding relay ports is extremely large.

[Brief explanation of drawings]

FIG. 1 is a diagram explaining the principle of the present invention, FIG. 2(a) is a block diagram of a relay device according to an embodiment, and FIG.
b) is a diagram showing an example of a network configuration, FIG. 3(a) is a star line network configuration diagram, FIG. 3(b) is a relay node plotter diagram, and FIG. 3(C) is a central relay node plotter diagram. be. In the figure. la, lb, 2a, 2b are relay notebooks, 3 is a central relay node, 5.10 is a control unit with the same configuration, 6a to 6n, 9
a to 9n are lower ports, 7.7a and 7b are upper ports, 8.10 are distribution units with the same configuration, and 11a to lid
is the lower port, 12 is the upper port, 13 is the control unit, 14 is the distribution unit, 15 is the control unit 1
3 is an additional terminal, 16 is an additional terminal of the distribution section 14, 21 to 25 is a receiving section RV, and 26 to 30 is a transmitting section DV. 31 is an OR gate, 32 is a collision determination section, 33 is a collision signal generation section, and 34 is a multiplexer MPX. Sl is a switch, first switching means, S2. S3 is a switch, second switching means, 50 is a concentrated uplink, 51 is a downlink to a lower node, and 52 is a distribution line. Tsukuyari period ■Genri theory home■ Hei 1 Ro

Claims (1)

[Claims] A plurality of lower-order ports (
11) and a set of upper-level ports (12) connected to upstream and downstream lines to the higher-level device, and a control means 8 ( 13) and a distribution means (14) for distributing a set of downlinks (51) to the lower-level device, wherein the uplink (50) to the higher-level device is connected back to the distribution means. a first switching means (S1) to
Connection terminals (15, 16) are provided for connecting one set of lines to the means and the distribution means, respectively, and the upper port (12)
second switching means (S2
, S3), the first switching means relays the line from the lower-order device back to the lower-order device, and the second switching means uses the upper port (12) as a lower-order port. relay device.