JP3194737B2 - Communications system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a communication system.

(Prior Art) When a network and an exchange are connected, there is a method in which a multiplex line of an exchange having a periodic frame is connected to the network and fixedly assigned to a time slot existing on the frame of the network.

However, in this method, the switching function is concentrated only on the switching equipment thus fixedly connected to the network.

Of course, by using the fixed allocation method as described above and using the network as a dedicated line transmission line,
There is also a method of connecting a plurality of exchanges.

However, in such a method, the service across exchanges is limited, and for example, it is impossible to perform a group telephone service by a plurality of exchanges. Therefore,
Even if connection between exchanges is performed by a dedicated line, the performance will be greatly reduced.

(Problems to be Solved by the Invention) When an exchange fixedly connected to a network and other exchanges are connected as described above, in a conventional connection method using only multiple lines, the exchange and the time slot of the network are fixed. Can only be associated with For this reason, the exchange function is concentrated only on the fixedly connected exchanges, and it is difficult to realize a large-capacity exchange by a plurality of exchanges even if other exchanges are connected.

An object of the present invention is to provide a communication system in which the switching function is not concentrated on the switching equipment.

[Configuration of the Invention] (Means for Solving the Problems) In the present invention, a plurality of stations including a station connected to an exchange are connected in a loop via a transmission line, and a plurality of time slots are provided between these stations. In a communication system in which a data frame and a predetermined control command are transmitted by circulating a frame composed on the transmission path, a first transmission path for exchanging data with the exchange, and connection command information from the exchange. Switch means for connecting and disconnecting the first transmission path, and a path setting request command based on the connection command information to a specific station among the plurality of stations. Command transmission means for transmitting, and control means for controlling disconnection by the switch means based on a path setting command transmitted from the specific station, The station manages whether or not a path can be set between exchanges. If the path can be set in response to a path setting request command transmitted from these stations, the station sets a path setting command to the station to which the exchange is connected. Is provided.

According to a second aspect of the present invention, a plurality of stations including a station to which an exchange is connected are connected in a loop via a transmission line, and a frame constituted by a plurality of time slots is circulated between the respective stations on the transmission line. In a communication system in which data and a predetermined control command are transmitted, connection is established between the exchange and a first transmission path for transferring data and a second transmission path to which connection command information is passed from the exchange. Switching means for disconnecting the first transmission path, command transmission means for transmitting a path setting request command based on the connection command information to a specific station among the plurality of stations, and Control means for controlling connection / disconnection by the switch means based on a path setting command transmitted from a station, wherein the specific station is in an idle state of the time slot. When there is an empty time slot in response to a path setting request command from the station connected to the exchange on the transmitting side, a path setting command is transmitted to the station connected to the exchange on both the transmitting and receiving sides. It is provided with means for performing.

(Operation) In the present invention, when a connection request from the switching organization occurs, a path setting request command based on the connection command information is transmitted to a specific station.

When a specific station can set a path according to the path setting request command, the path setting command is transmitted to the station connected to the exchange.

As a result, the connection between the stations connecting the exchanges becomes possible.

(Example) Hereinafter, details of an example of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a configuration of a communication system according to one embodiment of the present invention.

The network 1 shown in FIG. 1 has a plurality of stations 2a, 2b,... Connected in a loop via a transmission line 3.

Between the stations 2a, 2b,..., A frame constituted by a plurality of time slots is circulated on the transmission path 3 to transmit periodic data and transmit a predetermined control command.

Further, exchanges 4a, 4 are connected to predetermined stations 2a, 2b of the plurality of stations 2a, 2b, respectively.

The exchange 4a is fixedly connected to the network 1.
That is, the multiplexed line of the switching unit 4a based on the periodic frame is fixedly assigned to a predetermined one of the time slots via the station 2a.

As shown in FIG. 2, the station 2b receives an exchange 4b connected to the station 2b, a first transmission line 5 for performing periodic data transfer and connection command information from the exchange 4b. Are connected by two transmission paths 6. The switch-side input / output unit 7 of the station 2b transmits a switch 8 for disconnecting the first transmission line 5 and a path setting request command based on connection command information from the switch 4b to the specific station 2c. A control device 9 for controlling disconnection by the switch 8 based on a path setting command transmitted from the specific station 2c. Reference numeral 10 denotes a transmission path side input / output unit.

The specific station 2c manages whether or not the connection between the fixed connection exchange 4a and another exchange 4b is possible, and can set a path according to a path setting request command transmitted from the stations 2a and 2b. In this case, a switch general control unit for transmitting a path setting command to the station 2b is provided.

Then, in the communication system of the present embodiment, the following characteristic operation is performed.

In the exchange 4b, when a connection request with the exchange 4a of the fixed connection is generated, the connection command information is sent to the control device 9 of the station 2b via the second transmission line 6.

Then, the control device 9 of the station 2b transmits a path setting request command based on the connection command information to the specific station 2c.

The specific station 2c transmits a path setting command to the station 2b if the path can be set according to the path setting request command.

In the station 2b receiving this path setting command, the control device 9
Puts the switch 8 in the connected state, and the exchange 4b can be connected to the fixedly connected exchange 4a.

Further, when a connection request with the exchange 4b occurs in the fixed connection exchange 4a, the connection command information is transmitted to the specific station 2c.

The specific station 2c transmits a path setting command to the station 2b if the path can be set in response to the request.

In the station 2b receiving this path setting command, the control device 9
Puts the switch 8 in the connected state, and the connection between the fixedly connected exchanges 4a and 4b becomes possible.

 Next, another embodiment will be described.

FIG. 3 is a diagram showing a configuration of a communication system according to this embodiment.

The network 11 shown in FIG. 1 has a plurality of stations 12a, 12b,... Connected in a loop via a transmission line 13.

Between the stations 12a, 12b,..., A frame composed of a plurality of time slots is circulated on the transmission line 13 to transmit periodic data and transmit a predetermined control command.

In addition, predetermined stations 12a, 12b of the plurality of stations 12a, 12b.
The exchanges 14a and 14b are respectively connected.

These stations 12a and 12b are configured as shown in FIG.

The specific station 12c manages the idle / busy state of the time slot, and if there is an idle time slot in response to a path setting request command from the station connected to the transmitting-side exchange, the connection between the transmitting and receiving exchanges A path setting command is transmitted to the specified station.

Then, in the communication system of the present embodiment, the following characteristic operation is performed.

When a request for connection with the exchange 14b occurs in the exchange 14a, the connection command information is sent to the control device 9 of the station 12a via the second transmission path.

Then, the control device 9 of the station 12a transmits a path setting request command based on the connection command information to the specific station 12c.

The specific station 12c transmits a path setting command to the stations 12a and 12b when a path can be set according to the path setting request command.

In the stations 12a and 12b that have received the path setting command, the control device 9 sets the switch 8 to the connected state, and the connection between the exchanges 14a and 14b becomes possible.

[Effects of the Invention] As described above, according to the present invention, the tie slot of the exchange and the time slot of the network can be freely associated, and the exchange function of the connected exchange is not concentrated on the exchange side.

[Brief description of the drawings]

1 is a diagram showing a configuration of a communication system according to one embodiment of the present invention, FIG. 2 is a diagram showing a configuration of a station in this communication system, and FIG. 3 is a diagram showing a configuration of a communication system according to another embodiment. FIG. 1 Network, 2a, 2b, 2c Station, 3 Transmission line, 4a, 4b Switch, 5 ... First transmission line, 6 Second transmission line, 7 Switch side Input / output unit, 8: Switch, 9: Control device, 10: Transmission line side input / output unit.

Continuation of the front page (56) References JP-A-59-105798 (JP, A) JP-A-1-209837 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04M 7 / 00,7 / 16 H04L 12/42 H04Q 11 / 00,11 / 08

Claims (2)

(57) [Claims] 1. A plurality of stations including a station to which an exchange is connected are connected on a loop via a transmission line, and a frame constituted by a plurality of time slots is circulated between the respective stations on the transmission line. And a communication system in which a predetermined control command is transmitted. The communication system is connected by a first transmission line for transferring data to and from the exchange and a second transmission line for receiving connection command information from the exchange. Switch means for disconnecting the first transmission path, command transmission means for transmitting a path setting request command based on the connection command information to a specific station among the plurality of stations, and a command transmission means for transmitting the path setting request command from the specific station Control means for controlling disconnection by the switch means based on a path setting command, wherein the specific station sets a path between stations to which an exchange is connected. In addition to managing whether or not it is possible, if the path can be set according to the path setting request command transmitted from these stations, the path setting command is transmitted to stations other than the station to which the time slot is fixedly assigned. A communication system comprising: 2. A plurality of stations including a station to which an exchange is connected are connected in a loop through a transmission line, and a frame constituted by a plurality of time slots is circulated between the respective stations through the transmission line. And a communication system in which a predetermined control command is transmitted. The communication system is connected by a first transmission line for transferring data to and from the exchange and a second transmission line for receiving connection command information from the exchange. Switch means for disconnecting the first transmission path, command transmission means for transmitting a path setting request command based on the connection command information to a specific station among the plurality of stations, and transmission from the specific station Control means for controlling disconnection by the switch means based on a path setting command, wherein the specific station manages a closed state of the time slot. When there is an empty time slot in response to a path setting request command from the station connected to the exchange on the transmitting side, means for transmitting a path setting command to the station connected to the exchange on both the transmitting and receiving sides is provided. A communication system comprising: