JP2891956B2 - ATM network system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an ATM network system, and more particularly to an SVC (Switched Ver.).
dual Connection) type exchange device and PV
C (Permanemt Virtual Cone)
The present invention relates to an ATM network system in which switching devices are mixed.

[0002]

2. Description of the Related Art An SVC switching apparatus has a function of automatically selecting an optimum path connection from address information arranged in an ATM cell to be transmitted and performing a path connection.
The PVC type switching apparatus performs path connection by manually setting a path in advance or inputting a connection signal instructing path connection.

Conventionally, in this type of ATM network system, when a communication partner terminal is an unfixed switched line, SVC is automatically routed.
It consists of a system switching device. When the communication partner is fixed to some extent, such as a leased line, it is constituted by a PVC switching device.

[0004]

As described above, conventionally, the SVC system and the PVC system constitute separate networks, respectively. However, with the development of the network, both models are used for reasons such as utilization of resources. Construction of a mixed network may be required. In such a case, the PVC switching apparatus does not have an automatic path setting function and the connection is semi-fixed, so that there is a great restriction on the operation.

[0005] That is, there is a problem that the maintenance person must rewrite the path connection information each time the path connection is changed for the PVC switching apparatus.

[0006]

An ATM network system according to the present invention, when receiving a connection request signal from a terminal, means for automatically performing a path connection from address information contained in the connection request signal and the address information A plurality of SVC-type switching units having means for transferring connection information indicating the name of the path connected to the control line to the control line, and means for automatically making a path connection based on the address information even when address information is received from the control line. Means for transferring address information contained in the connection request signal to a control line when a connection request signal is received from a terminal, and a plurality of PVC switching devices for performing a path connection in accordance with a connection instruction signal from the control line And the address information and the connection information transferred from the control line on the path from the transmitting terminal to the receiving terminal. A network management device having means for sequentially selecting an optimal path connection for each of the PVC switching devices and transmitting the connection instruction signal, and transmitting address information to each of the SVC switching devices; Have.

Further, the network management device may include means for confirming and monitoring a path connection operation with respect to the SVC switching device and the PVC switching device.

Further, the control line may use a PVC path logical line for network maintenance.

[0009]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing an example of path connection in FIG.

In FIG. 1, this ATM network system is an example in which an SVC and a PVC type switching device are mixed, and
A data line 4 for connecting one SVC type switching device 1a to 1c, two PVC type switching devices 2a and 2b, a network monitoring device 3, and each switching device, and a connection between each switching device and the network management device 3. And a control line 4. A terminal is connected to each switching device.

The SVC exchange 1 selects an optimum output side data line 4 in accordance with network information input in advance from address information in a connection request signal input from a terminal, performs path connection, and transmits address information and the like to a control line. 5 to the network management device 3. Further, when address information is received from the network management device 3 via the control line 5, an optimal data line 4 is selected based on the address information and a path connection is made.

The PVC switching device 2 receives a connection signal from the network management device 3 via the control line 5 and performs a path connection according to the instruction. Network management device 3 is P
This provides the VC system switching device 2 with an automatic path connection function equivalent to that of the SVC system switching device 1. That is, SVC
When address information and the like are received from the system switching device 1 and it is determined from this information that the switching device on the next path is a PVC system, an optimal path connection is determined in place of the PVC system switching device, The result is used as a connection signal in control line 5.
Is transmitted to the PVC switching device via the.

The data line 4 is a physical line using an optical cable, a coaxial cable or the like, while the control line 5 uses a maintenance PVC path logical line formed by an ATM network.

Next, the operation will be described with reference to FIG. FIG.
1 shows a path connection example in which the SVC switching device 1a, the PVC switching device 2a, and the SVC switching device 1b are paths in the ATM network in FIG. When the terminal 6 issues a connection request signal 101 having the terminal 7 as the destination address, the path connection unit 11 of the SVC switching apparatus 1a automatically performs a path connection from the address information of the connection request signal 101. The connection control unit 12 transfers the address information 102 including the address information and the connection information indicating the output-side data line connected to the path to the network management device 3.

The network management device 3 recognizes from the address information 102 that the next switching device is the PVC type switching device 2a, and receives the PVC input in advance.
An optimal path connection is selected from network information on the system switching device 2a, and this is selected as a connection signal 103 by PVC.
It is transmitted to the system switching device 2a. PVC system switching device 2a
The connection control unit 22 receives the connection signal 103 and instructs the path connection unit 21 to perform a path connection. The path connection unit 21 performs a path connection according to the instruction.

The network management device 3 waits for the path connection of the PVC switching device 2a and transmits the address information 104 to the next SVC switching device 1b. Since the PVC switching device 2a does not relay the address information, the SVC switching device 1b receives the address information from the network management device 3 at the connection control unit 12, and automatically performs the path connection at the path connection unit 11. In this way, a communication path is established from the terminal 6 to the terminal 7.

Incidentally, the network management device 3 may monitor the operation of each device, generate an alarm when a failure is detected, and add a general management function such as displaying a failure location or changing a routing.

In contrast to this example, when the PVC switching apparatus 2 receives the line connection request signal 101 from the terminal 6, the connection control unit 22 of the PVC switching apparatus 2
Is transferred to the network management device 3 from the network management device 3. Upon receiving the connection request signal 101, the network management device 3 selects the optimum path and returns
A connection signal is transmitted to the VC system switching device 2.

[0019]

As described above, the ATM network system of the present invention is provided with the function of automatically determining and instructing the path connection by the network management device for the mixed PVC system switching device. This is equivalent to the case where the device is constituted by an SVC type switching device having an automatic path setting function, and there is an effect that path connection can be completely automated in response to an arbitrary connection request from a terminal.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram illustrating an example of a path connection in FIG. 1;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 SVC switching device 2 PVC switching device 3 Network management device 4 Data line 5 Control line 6, 7 Terminal device

Claims (3)

(57) [Claims] When a connection request signal is received from a terminal, means for automatically performing a path connection based on address information included in the connection request signal, and the address information and connection information indicating a line name of the path connected. A plurality of SVC switching devices having means for transferring to a control line and means for automatically performing a path connection based on the address information even when address information is received from the control line, and when a connection request signal is received from a terminal. Means for transferring address information contained in the connection request signal to the control line, a plurality of PVC switching devices for performing a path connection in accordance with a connection instruction signal from the control line, and the address information transferred from the control line. From the connection information and the connection information, an optimal path connection is sequentially selected for each of the PVC switching devices on the path from the terminal on the transmitting side to the terminal on the receiving side. An ATM network system having means for selectively transmitting the connection instruction signal and transmitting address information to each of the SVC switching devices. 2. The network management device according to claim 2, wherein
2. The ATM network system according to claim 1, further comprising means for confirming and monitoring a path connection operation with respect to the C system switching device and the PVC system switching device. 3. The control line is a P for network maintenance.
3. The ATM network system according to claim 1, wherein a VC path logical line is used.