JPH067654B2 - Method of incorporating nodes into ring network - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for incorporating a node into a ring, and more particularly to a system for incorporating a node into a dual ring transmission line when the power of the node is turned on.

[Background of the Invention]

As a conventional technique, "Integrated optical loop transmission system H-8644
As described on page 49 of "Loop Network Manual",
The master node (LSN) is IPLed, and the node outside the loopback is joined to the loop according to the instruction of the master node. However, a loop system without a master node could not join the node to the loop.

[Object of the Invention]

An object of the present invention is to eliminate the above-mentioned conventional problems, and to provide a node embedding method capable of embedding from any node into a ring network without the instruction of a master node. It is in.

[Outline of Invention]

According to the present invention, when the node power supply is off, the node is in a ringback state, the data transmission / reception circuit is bypassed from the first transmission line, and the node power supply on / off data transmission circuit is inserted into the first transmission line. It is characterized by a node incorporation method in which the node turned on is automatically incorporated into the ring network by releasing the ringback when the timing signal is detected from the second transmission line.

Example of Invention

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

FIG. 1 is a configuration diagram of a node 1 which is an embodiment of the present invention. The active transmission line input side 5 is connected to the bypass control circuit 13. The bypass control circuit 13 includes a bypass relay drive circuit 14, bypass relays 15 and 16, and a bypass transmission line 17 connecting the bypass relays 15 and 16. The data transmission / reception circuit 18 uses the data transmission / reception circuit connection transmission lines 19 and 20 to bypass the bypass relay 15.
And 16 are connected. The data transmission / reception circuit 18 includes a data transmission / reception unit 44, a transmission line timing signal generation unit 45 and a transmission line timing signal supply line 46, and the transmission line timing signal generation unit 45 transmits to the data transmission / reception unit 44 through the transmission line timing signal supply line 46. Connected. The bypass control circuit 13 has a bypass control circuit output transmission line 21.
Through the ringback control circuit 37. The ringback control circuit 37 includes ringback relays 22 and 2
8, ringback relay drive circuits 23 and 26, ringback relay drive circuit control signal lines 35 and 36, ringback transmission lines 24 and 25, and ringback relay control circuit 27. The bypass control circuit output line 21 is connected to the input side of the ringback relay 22, and the two outputs of the ringback relay 22 are connected to the working transmission line output 30 and the ringback transmission line 24, respectively. The ringback transmission line 24 is connected in the middle of the backup transmission line output 29. The input of the ringback relay 28 is connected to the backup system transmission line input 31, and the two outputs are respectively the backup system transmission line output 2
9 and the ringback transmission line 25. The ringback transmission line 25 is connected in the middle of the active transmission line output 30. The ringback relay drive circuits 23 and 26 are circuits for driving the ringback relays 22 and 28, respectively, and are connected to the ringback relay control circuit 27 through the ringback relay drive circuit control signal lines 35 and 36. The transmission line timing signal detection circuit 33 is connected to the standby system transmission line input 31 by the standby system transmission line branch line 32,
It is connected to the ringback relay control circuit 27 through the transmission line timing signal detection report signal line 34.

In the initial state when the node power is off, the bypass relays 15 and 16 are connected to the bypass transmission line 17 and bypass the data transmission / reception circuit 18. The ringback relays 22 and 28 have their outputs connected to the ringback transmission lines 24 and 25, respectively. When the node power is on,
The bypass relay drive circuit 14 drives the bypass relays 15 and 16, and switches the connection from the bypass transmission line 17 to the data transmission / reception circuit insertion transmission lines 19 and 20. When the transmission line timing signal detection circuit 33 detects the presence of the transmission line timing signal from the standby transmission line branch line 32, the transmission line timing signal detection circuit 33 notifies the ringback relay control circuit 27 of the transmission line timing signal detection through the transmission line timing signal detection report signal line 34. To report. When the ringback relay control circuit 27 receives this report, it outputs the outputs of the ringback relays 22 and 28 to the ringback relay drive circuits 23 and 26 from the ringback transmission lines 24 and 25, respectively, and the active transmission line output 30 and the backup. It is instructed to switch to the system transmission line output 29. Ringback relay drive circuits 23 and 2
6 receives this instruction, and ringback relays 22 and 2
8 is switched from the ringback transmission line 24 to the active transmission line output 30 and from the ringback transmission line 25 to the standby transmission line 29.

2 to 4 are operation explanatory diagrams when the upstream node adjacent to the node which is currently powered on is subsequently powered on, and FIG. 5 is a timing chart showing the operation. In FIG. 2, the node 2 is already in the power-on state, and the data transmission / reception circuit 18 is transmitting the transmission path timing signal. The transmission line timing signal detection circuit 33 of the node 3 is in the transmission line timing signal undetectable mode because the power supply of the node 3 is off. In FIG. 3, the node 3 is powered on and the transmission path timing signal detection circuit 33 enters the transmission path timing signal detection possible mode to detect the transmission path timing signal from the data transmission / reception circuit 18. In FIG. 4, the ringback control circuit 37 of the node 3 receives the transmission line timing signal detection report from the transmission line timing signal detection circuit 33 and releases the ringback. FIG. 5 is a timing chart showing the above operation.

FIGS. 6 to 8 are operation explanatory diagrams when a node adjacent to a node which is presently powered on and is adjacent to the downstream node is subsequently powered on, and FIG. 9 is a timing chart showing the operation. In FIG. 6, the node 2 is already in the power-on state, and the transmission line timing signal detection circuit 33 is in a mode in which the transmission line timing signal can be detected from the downstream side. Node 1
Is in a power-off state, and the bypass control circuit 13 bypasses the data transmission / reception circuit 18. In FIG. 7, the node 1 is powered on, the bypass control circuit 13 inserts the data transmission / reception circuit 18 into the transmission line, and the data transmission / reception circuit 18 sends out the transmission line timing signal to the transmission line. The transmission line timing signal detection circuit 33 of the node 2 detects the transmission line timing signal from the data transmission / reception circuit 18 of the node 1. In FIG. 8, the ringback control circuit 37 of the node 2 receives the report from the transmission path timing signal detection circuit 33 that the transmission path timing signal is detected, and releases the ringback. FIG. 9 is a timing sheet showing the above operation.

Example of Invention

According to the present invention, since the present ring network has the above-mentioned configuration, it is possible to obtain a node incorporation method capable of performing ring incorporation from any node without depending on the master node.

[Brief description of drawings]

FIG. 1 is a block diagram of a node which is an embodiment of the present invention, and FIG.
FIG. 4 to FIG. 4 are operation explanatory diagrams when the upstream node adjacent to the node of the present power-on of the ring network which is one embodiment of the present invention is powered on, and FIG. 5 is of FIG. 2 to FIG. An operation timing chart, FIGS. 6 to 8 are operation explanatory views when a node downstream of the current power-on node adjacent to the current power-on node of the ring network is power-on, and FIG. 10 is an operation timing chart of FIGS. 6 to 9. 1, 2, 3 ... Node, 18 ... Data transmission / reception circuit, 1
3 ... Bypass control circuit, 37 ... Ringback control circuit, 33 ... Transmission line timing signal detection circuit

Claims (1)

[Claims] 1. In a ring network in which a plurality of nodes are connected in a loop by two transmission lines that transmit signals in opposite directions, the node is bypassed from the first transmission line when the power is off, and the nodes are bypassed when the power is on. A data transmission / reception circuit that is inserted into the first transmission line and sends a timing signal downstream, and two transmission lines when the timing signal from the second transmission line is monitored and the timing signal is not detected or when the power is off. A method of incorporating a node into a ring network, characterized in that two ringbacks are formed so as to fold back between the two, and a means for controlling both of them to be released when the power is on and a timing signal is detected. .