JPS61198945A - Network control system - Google Patents

Abstract

PURPOSE:To attain reset of quick and sure logical bus by recognizing the switching state of a network based on information of a command packet sent from at least one station in the network so as to select an incoming station address. CONSTITUTION:Data packets 301, 401, 501 are sent respectively to substantial incoming station addresses according to logical buses 31, 41, 51 registered in advance by slave stations 3, 4, 5. A command packet (not shown) representing outgoing/incoming control and relay control using other incoming address is sent from a backup station 2 to the slave stations 3, 4, 5 on emergency. In receiving a command packet, the slave stations 3, 4, 5 send a data packet to other incoming station address according to logical buses 32, 42, 52. Thus, since each station switches automatically the logical bus, the resetting of the logical bus is attained surely and quickly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a logical path switching control system for a packet switching network that transmits control data.

[Conventional technology]

Conventionally, FI56 is used to set logical paths in packet-switched networks.
-4-10 Published by Nihon Den Corporation, Technical Reference Material DCNA Transport Level Protocol P9 to P15 i As shown, there is a fixed connection (PVC) that connects the originating terminal 9 and the terminating terminal in a fixed manner, and a There is a partner selection connection (VC) in which a partner is selected and connected.

In packet-switched networks where control data such as measurement quantities and binary signals are packetized and transmitted, the communication partner is usually fixed, so the former fixed circumscribed reading method does not require a call setup procedure. is often used.

In this method, a table for registering logical paths is provided on the terminating side of one transmitting station 9, and periodically packetized control data is transmitted to the terminating side while referring to this table.

[The invention solves the problem [7] In the conventional system, the logical path is set fixedly, so a specific station, for example, the master station for centralized monitoring, can be used for disasters such as banditry. If you are affected by a disaster and are unable to process incoming calls, and you want to change the destination of packets so that another backup station that has been set up separately within the network can handle the centralized monitoring, all stations within the network must If you don't change the settings of the table that registered the multi-attack logical paths, the system will be down for a long time (which could have been a drawback at any time).

It is an object of the present invention to provide a network control method for quickly changing logical path settings in such cases and constructing a highly reliable If system with fewer system outages.

[Means for solving the invention]

The control method of the present invention is applied to a packet-switched network that packetizes and transmits control data such as measured quantities and binary state signals. Then, the slave station relays the packet to one of the above-mentioned receiving sides, and the receiving side determines whether or not to receive the packet by referring to the above-mentioned called-side address according to the switching state of the network. Each station recognizes the switching status of the network based on the information in the command packet sent from the station, and changes the logical path of the entire network by selecting one of the destination addresses listed above. .

[Operation] In this invention, two destination addresses are sent from the slave station in advance: the original destination (local station) and the backup destination (backup station). The second monitoring station (master station) performs relay and final call operations by referring to the original address of the called party. When a switching command is received from the backup station in an emergency, the slave station or backup station refers to the destination address at the time of backup and performs communication and communication operations with the backup station. This system allows the called party to be changed without changing the registration table.

[Embodiments of the invention]

An embodiment of the present invention will be described and explained below based on the IEI diagram and @2 diagram. Figure 1 is from a book showing the relationship between the logical paths between each station belonging to a packet switching network and the packets transferred within the network.

The master station fil shown in the figure (2) is a backup station, and each slave station f31 +41 +51 has a logical path (31/32"l) in advance.

According to the tables that (41/42) and (51152) failed to register, h data packets (301) and (
401), sends (5ox).

(3ox), (401), (501) are the original called side address (hereinafter referred to as the 1st called side address) (11 station address, the called side address at the time of backup (hereinafter referred to as the 2nd nursing station address). (2) The address of the station is assigned as (2), and normally each station performs call origination/reception control and relay control based on the first destination address.

In the case of Fig. 1, each slave station f31 +51 has (3
01).

The packet (501) is transmitted to the transmission line connected to the master station (1). Slave station (41 data packets (4o1)
) to the slave station (61), and the slave station (6) sends a message to the master station i.
Relay to l+. Therefore, in this state, the logical path (3
1)(41)(51) are used.

Figure 2 is for switching control to the backup station when the master station is running as shown in Figure 1 above.
) sends command packets (203) (2) 4) (205) to each slave station [31+41 +51] to perform call control and relay control using the $2 call address. Slave station (3) (4116 + big data packet (30
1) Transmit (501) to the backup station (2nd station) to the connected transmission line.Slave station (4) sends the data packet (4
01) to the slave station (6), and the slave station (5) relays it to the backup station (2). Therefore, in this state, logical paths (32), (42), and (52) are used.

〔Effect of the invention〕

As described above, according to this invention, it is possible to broadcast stations within the network! @9 When a problem occurs, each station automatically switches the logical path in response to a command from one station, so the logical path can be quickly and reliably reset, and the outage time is short. It is possible to construct a highly reliable system.

[Brief explanation of drawings]

FIG. 1 shows the normal operation of an embodiment of the present invention, and FIG. 2 is an explanatory diagram of the backup operation when the wholesaler station is damaged. fil...Main station, (21...Backup station, f3
+ +41 f5+...Slave station, 161~αB・inter-station transmission line, 31) c(2Gll) h51ω...(6
)~αυ logical bus, (301)(
401) (501)...de~tapakenoto, (203)
(204) and (205) are switching command packets. In the drawings, the reference numeral 8 indicates the same or equivalent part.

Claims (1)

[Claims] In a packet-switched network that packetizes and transmits control data such as measured quantities and binary status signals, the receiving side sends out packets waiting for multiple destination addresses, and the receiving side sends out packets waiting for multiple destination addresses, and depending on the switching state of the network, one of the above-mentioned incoming calls It consists of a slave station that relays packets to the receiving side, and a receiving side that also refers to the receiving side address and decides whether or not to receive the packet depending on the switching state of the network. A network control method characterized in that each station recognizes the switching state of the network based on the information in the command packet sent and changes the logical path of the entire network by determining one of the above-mentioned destination addresses. .