JPH0423648A - Packet switching system - Google Patents

Abstract

PURPOSE:To use one logic channel in a terminal equipment effectively for each of plural communication parties by registering plural sets of combinations of connection couples of PVC communication in advance and selecting one set of them. CONSTITUTION:When a switching command of a PVC connection control table 4 is applied by an operator console 3-2, a PVC connection control switching command packet 44 is sent to packet switches 1-1 and 1-2 from a network management equipment 3-1. The packet switch 1-1 receives RF 46, 50 for confirmation from terminal equipments 2-1, 2-2 and the packet switch 1-2 receives RF 48, 52 for confirmation from terminal equipments 2-3, 2-4. When the packet switches 1-1 and 1-2 select a PVC connection control table 4 upon the receipt of them.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a packet switching system that performs fixed peer connection (hereinafter referred to as PvC) control in a packet switching network using virtual circuits.

[Conventional technology]

FIG. 6 is a network configuration diagram showing a conventional packet switching method disclosed in, for example, Japanese Patent Laid-Open No. 61-72449. In the figure, 1-1 and 1-2 are packet switches forming a packet switching network, and these packet switches 1-
The packet switching network formed by 1 and 1-2 uses a virtual circuit to set up a virtual dedicated communication path between a pair of originating terminals and a receiving terminal. Therefore, when communicating with multiple terminals and communicating with only one terminal at a time, the number of logical channels equal to the number of terminals is the same as the number of terminals. Needed. Also, 2-1.2
-2 is a terminal accommodated in the packet switch 1-1;
2-3 and 2-4 are nine terminals accommodated in the packet switch 1-2.

Next, the operation will be explained. Here, FIG. 7 shows terminal 2-
FIG. 3 is an explanatory diagram showing the flow of packets when communicating 3 and 2-4.

When the packet switch 1-1 receives a reset request packet (hereinafter referred to as RQ) 11 from the terminal 2-1, it starts communication with the terminal 2-3 and transmits an RQ 12 to the opposite packet switch 1-2. Packet switch 1-2 is RQ12
Upon receiving this, the terminal 2-3 starts communication between the terminal 2-3 and the terminal 2-1, and issues a reset instruction packet (hereinafter referred to as RI) 13 to the terminal 2-3. The terminal 2-3 that has received R113 sends out a reset confirmation packet (hereinafter referred to as RF) 14t- if it is possible to start work. The packet switch 1-2 sends RF15 to the packet switch 1-1, and the packet switch 1-1 sets the communication state to a start-up completion state and sends RF16 to the terminal 2-1. From then on, data transfer is possible between terminal 2-1 and terminal 2-3.
A data packet (hereinafter referred to as DT) 17 times) is performed.

Next, when the terminal 2-1 ends the communication with the terminal 2-3 and switches to the terminal 2-4, the terminal 2-1 requests the terminal 2-4 to communicate with the terminal 2-4. Issue RQ18 to select. When the packet switch 1-1 receives RQ18, it sets the communication state with the terminal 2-3 to the closed state, so after transmitting RQ19 to the packet switch 1-2, it changes the communication state with the terminal 2-4. R to start the school day
Q21 is transmitted to the packet switch 1-2. The packet switch 1-2 receives RQ19 and sends RI20 to the terminal 2-3 to end communication with the terminal 2-3, and at the same time receives RQ21t- and starts communication with the terminal 2-4. To set the status, R122 is sent to the terminal 2-4. R
Terminal 2-3, which received I20, transmits RF23 to packet switch 1-2, and packet switch 1-2, which received this, sends RF23 to packet switch 1-2.
2 transmits RF24 to the packet switch 1-1. R.I.
RF25.22 from terminal 2-4 which received RF25.22. RF26. from packet switch 1-2. The flow of RF27 from the packet switch 1-1 is the flow of RF14. RF15. from packet switch 1-2. Packet switch 1-1
The same is true for RF16 from . From now on, data transfer is possible between terminal 2-1 and terminal 2-4. 9, DT2
8 Yashi and Tari are held.

[Problem to be solved by the invention]

Since the conventional packet switching system is configured as described above, it is necessary for each terminal 2-1 to 2-4 to register multiple communication partner terminals for each logical channel, and switching control of communication partner terminals is required. Since the terminal performs this, it is necessary to provide the terminal with special functions related to switching selection, such as setting the communication partner's identification code in the RQ packet.
Not only is it necessary to synchronously control PVC switching between the own and the other party's terminals, but also regarding the logical channel on the other party's side of communication, while the switching source terminal is communicating with another terminal, that logical channel There were issues such as the company becoming idle.

This invention was made in order to solve the above-mentioned problems, and it is possible to allocate data all at once by remote control from a network management device without equipping the terminal with a special switching selection function other than the X, 25 protocol specifications. An object of the present invention is to obtain a packet switching system that enables synchronous switching and allows connection of a plurality of communication partners to one logical channel of a terminal.

[Means to solve the problem]

The packet switching system according to the present invention registers in advance a plurality of combinations of connection pairs of logical channels related to PVC communication between terminals, and switches the corresponding PVC according to a switching control instruction from a network management device.
One of the connected pairs of VC logical channels is selected and switched in synchronization.

[Effect]

In the packet switching method according to the present invention, a plurality of connection control tables regarding combinations of connection pairs of PVC logical channels between communicating terminals are stored in advance in a packet switching device in a packet switching network, and communication partner terminals are switched. The network management device sends an instruction to switch the connection control table to each packet switch.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 1-1.1-2 is a packet switch, 2-1
2-4 are terminals, which are the same or equivalent to those of the conventional terminals denoted by the same reference numerals in FIG. 6, and detailed explanations thereof will be omitted. In addition, 1 is a packet switch 1-1.1-
P using the virtual circuit formed in 2.
This is a packet switching network that performs VC control. 3-IFi is a network management device of this packet switching network 1, and 3-2 are operator consoles connected to this network management device 3-1.

FIG. 2 is an explanatory diagram showing a PvC connection control table held within packet switches 1-1 and 1-2. In the figure, 4 is a PvC that manages connection pairs of PVC management channels.
In the connection control table, one packet switch 1-1 (1
-2), four sets from TBLO to TBLt-1 are prepared. In this PvC connection control table 4, 4-1 is information on PvC logical channel connection pairs, and n pairs from IDX0 to IDXn-1 are set. In addition, in the information 4-1 of one set of connection pairs, 4-1-1 is the eye side address, 4-1
-2 is the eye side line number, 4-1-3 is the eye side logical channel group number (LCGN) and logical channel number (LC
N), 4-1-4 is the eye side call memory number, 4-1-5 is the other side address, 4-1-6 is the other side station number, 4-1-7
is the call memory number of the other party. Here, the eye side means the PvC
Packet switch 1-1 (1
-2) means the terminal side accommodated in the terminal, and the other side means the terminal side with which the terminal communicates.

FIG. 3 is an explanatory diagram showing a call memory management table for managing call memory, which is an intra-network resource allocated in correspondence with packet logical channels. In the figure, 5 is a call memory management table fi, and 5-1 is information for one call memory.
Call memory No. in packet switch 1-1 (1-2)
, 0 to m-1, information regarding m call memories is managed. In addition, in the information 5-1 regarding one call memory, 5
-1-1 is the terminal address, 5-1-2 is the line number, 5-
1-3 is LCCN and LCN, and 5-1 to 4 are call memory status information (CALL 5TATUS).

FIG. 4 shows the network management device 3-1 to the packet switch 1-1 (
1-2) is an explanatory diagram showing a switching means when switching the PvC connection control table in FIG. 6 in the figure indicates when a switching instruction command is input from the operator console 3-2;
From the network management device 3-1 to each packet switch 1-1.1-2
γ is a PVC connection control switching instruction packet sent to the packet switch 1-1.1-2, and γ is a PVC connection control switching response packet sent back from each packet switch 1-1.1-2. In addition, in this PVC connection control switching instruction packet 6, 6-1 is a packet identifier (ffYP), and 6-2 is a PVC after switching.
The table number 6-3 of the connection control table (hereinafter referred to as new TBL number) is the table number of the PVC connection control table before switching (hereinafter referred to as old TBL number). Furthermore, in the PVC connection control switching response packet T, 7
-1 is the packet identifier (PTYP), 6-2 is the new TB
The L number, 6-3, is the daily TBL number, and 7-2 is the switching control result response status.

Next, the operation will be explained. Here, FIG. 5 shows terminal 2-
1.2-2 is an explanatory diagram showing the flow of packets when communicating with terminal 2-3.2-4.

First, the operation when the terminal 2-1 and the terminal 2-3 communicate, and the terminal 2-2 and the terminal 2-4 communicate using the PVC logical channel will be explained. In Figure 5, packet switch 1-1
and PvC connection control table 4 in 1-2 is terminal 2-
It is assumed that terminals 1 and 2-3 and terminals 2-2 and 2-4 are selected in advance to perform PVC communication.

Now, when the terminal 2-1 sends the RQae indicating the start of work to the packet switch 1-1, the packet switch 1-1 sends the RQae to the packet switch 1-1.
1 to the packet switch 1-2, and the packet switch 1-2 transmits the RI to notify the terminal 2-3 of the start of work.
Send 32. Terminal 2-3 confirms gRF3 with respect to RI32
3 to packet switch 1-2, packet switch 1
-2 transmits RF34 to the packet switch 1-1, and the packet switch 1-1 transmits RF35 to the terminal 2-1.

Similarly, when RQ36 is sent from terminal 2-2 to packet switch 1-1, RQ37. RI3B.

RF39, RF40. RF41 is transmitted and received on the route between terminals 2-4. From now on, the terminals 2-1 and 2-3 and the terminals 2-2 and 2-3 will be able to communicate with each other.
42 and 43 are performed respectively.

Next, PvC communication between terminals 2-1 and 2-3 and terminals 2-2 and 2-4 ends, and terminals 2-1 and 2-4 and terminal 2
The operation when switching to PVC communication of -2 and 2-3 will be explained. When the operator console 3-2 K PVC connection 1f2 control table 4 switching instruction command is input, a PVC connection control switching instruction packet 44 is sent from the network management device 3-1 to the packet exchangers 1-1 and 1-2. . In the packet switch 1-1, terminals 2-1 and 2-
The packet switch 1-2 sends RIs 45 and 49 indicating that communication is not possible to the terminals 2-3 and 2.
-4, RIs 47 and 51, which are also unable to communicate, are transmitted. After that, the packet switch 1-1
-1 and 2-2'2)- respectively receive confirmation RF46 and 50, and packet switch 1-2 receives confirmation RF46 and 50 from terminal 2-3.
and 2-4, and each packet switch 1-1 and 1-2 switches the PvC connection control table 4 upon receiving them.

When the switching of the PvC connection control table 4 with the PvC connection control table 4 is completed normally, each packet switch 1-1.1-2 sets a normal end response status in the PvC connection control switching response packet 53 and sends it to the network management device 3-1. do. Thereafter, the packet switch 1-1 transmits RIs 54 and 58 indicating the start of work to the terminals 2-1 and 2-2, respectively, and receives RFs 55 and 59 confirming these from the terminals 2-1 and 2-2, respectively. do. Similarly, the packet switch 1-2 is connected to the terminal 2-
Starting RI 56 and 60 for 3 and 2-4
and receives their confirmation RF5γ and 61 from each terminal 2-3 and 2-4, respectively. Thereafter, the DTs 62 and 63 that are communicable between the terminals 2-1 and 2-4 and between the terminals 2-2 and 2-3 are determined.

In the above embodiment, the PvC connection control table switching instruction command is input from the operator console 3-2 directly connected to the network management device 3-1. It is also possible to connect a logical channel from a terminal via the packet switching network 1 (remote console) and input a switching command for the PvC connection control table 4 from the terminal.

Furthermore, in the above embodiment, the case where the PvC connection control switching packet is issued by inputting a switching instruction command from the operator has been explained, but the packet is automatically issued from the network management device 3-1. For example, fixed time switching (daytime/nighttime switching, etc., depending on time zone) can also be performed automatically.

Furthermore, by providing a remote maintenance function for the PVC connection control table 4 from the network management device 3-1, it becomes easy to add or change the connection form within the network.

〔Effect of the invention〕

As described above, according to the present invention, a plurality of combinations of PvC communication connection pairs are registered in advance and one of them is configured to be selectively switched. can be used effectively for each communication partner, making it possible to diversify the connection forms between terminals within the network.Furthermore, switching control can be performed collectively from the network management device, and the network This has advantages such as easy synchronization of PvC switching and no need for terminals to have special functions for PvC switching.

[Brief explanation of the drawing]

FIG. 1 is a network configuration diagram of the Kerat switching system according to an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the format of the PVC connection control table, and FIG. 3 is also a diagram showing the format of the call memory management table. FIG. 4 is an explanatory diagram showing the PvC switching control means from the network management device in this invention. FIG. 5 is an explanatory diagram showing the flow of packets when communicating between terminals in this invention. The figure is a network configuration diagram showing a conventional packet switching method, and FIG. 7 is an explanatory diagram showing the flow of packets when communicating between terminals. 1 is a packet switching network, 1-1.1-2 is a packet Switching equipment, 2-1 to 2-4 are terminals, and 3-1 is a network management device. In the figures, the same reference numerals indicate the same or corresponding parts. Patent applicant Mitsubishi Electric Co., Ltd. agent Patent attorney 1) Hiroshi Sawa Akira (2 others) 1″″″￥- 1: Yo・tJj Graph Graph Figure ［4

Claims (1)

[Claims] In a packet switching network that uses a virtual circuit to set up a virtual dedicated communication path between a pair of originating terminals and a terminating terminal, the communication partner via the communication channel is always fixed. In a packet switching method that performs connection control, a plurality of combinations of connection pairs for fixed connection communication between the calling side terminal and the called side terminal are registered in advance, and one of the plurality of connection pairs is registered in advance. is selected by remote control from a network management device of the packet-switched network, and communication is enabled only with a combination of a calling terminal and a receiving terminal through the selected connection pair. packet switching method.