JPS61218247A - Packet exchange system - Google Patents

Abstract

PURPOSE:To take synchronization with a communication opposite party by completing the communication among a caller side exchange, an exchange managing device and an incoming side exchange as the communication between the two parties where a request or inquiry and a reply corresponding thereto in pairs. CONSTITUTION:The transmission of various packets among exchange devices 2a, 2b and the exchange managing device 3 is executed by utilizing a relay line 4 entirely. At first, an incoming reply signal 24 from a terminal equipment 1b to the exchange 2b, a connection reply packet 25 from the exchange 2b to the exchange 2a and a connection reply signal 26 from the exchange 2a to the terminal equipment 1a are set in this order and the communication between the terminal equipments 1a and 1b is executed. The communication between the exchange and the exchange managing device is completed as the communication between the two parties to be synchronized easily with the communication opposite party, then a subscriber number independently of the physical position of the terminal equipments is used and the exchange system is controlled easily even at congestion.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a packet processing system that is configured of a plurality of switching devices and a switching management device connected to a trunk line, and a plurality of terminal devices connected to the switching device. It relates to an improved system in an exchange system.

[Conventional technology]

Regarding the improvement of the exchange system as described above, the applicant of the present invention previously made a proposal in Japanese Patent Application No. 173534/1982 (filed on September 20, 1988). FIG. 8 is a block diagram showing an example of a conventional switching system. In the figure, 1a and lb are terminal devices, 2a and lb are terminal devices, respectively.
t2b is a switching device, 3 is a switching management device, and 4 is a ring-shaped trunk line. Further, FIG. 9 is a diagram showing an example of the sequence of signals and packets between the terminal device, the switching device, and the switching management device in the switching system of the eighth cause. In this example, the carrying device 1 connected to the exchange device 2a
3A shows the sequence of signals and packets when a connection request is made to the terminal device 1b connected to the switching device 2b.

In the figure, 27 is a connection request signal, 28, 29 is a connection request/zokerato, 30 is an incoming call signal, 31 is an incoming call response signal,
32 is a connection response/ξ ticket 33 is a connection response signal.

Next, details of the sequence example shown in FIG. 9 will be explained. First, upon receiving the connection request signal 27 from the terminal device 1a, the switching device 2a checks whether the terminal device to which the connection request is made is accommodated within the local station by referring to a table within the local station. As a result, if it is found that the call is not accommodated within its own station, the switching device 2a sends a connection request packet 28 containing the called subscriber number to the switching management device 3.
Send. The exchange management device 3 that receives this connection request lξ ticket 8 refers to the table within the exchange management device 3, converts the called subscriber number to a terminal physical address, and converts the called subscriber number to a terminal physical address. The connection request packet 29 is transferred to the switching device 2b located there. This connection request packet 2
9, the switching device 2b, knowing from the terminal physical address indicated in the packet that the connection request is addressed to the terminal device lb, transmits an incoming call signal 30 to the terminal device 1b. Thereafter, first, the terminal device 1b sends an incoming call response signal 311 to the switching device 2b, and then the switching device 2b sends a connection response packet 32 to the switching device 2a. Finally, each response signal or packet is transmitted from the switching device 2a to the terminal device 1a in the order of the connection response signal 33, and communication between the terminal device 1a and the terminal device 1b becomes possible.

[Problem that the invention seeks to solve]

Conventional 5 as above! ``Since the switching system is configured with one or more units, the packet sequence from one calling side switching device sending a connection request packet to receiving a response packet is as follows.

Communication occurs between three parties: the calling side switching device, the switching management device 9, and the called side switching device. In such three-party communication, it is difficult to synchronize with one communication partner, especially between the two exchange devices, which requires relaying by the exchange management device. Therefore, there is a problem in that it becomes very difficult to control the switching system when it runs.

This invention was made to solve these problems, and it is possible to use a subscriber number that does not depend on the physical location of a terminal device, and to easily control the switching system even in a crowded situation. The purpose is to obtain a packet switching system that can perform

[Means for solving problems]

In the packet switching system according to the present invention, the switching device includes:
The switching management device is equipped with means for inquiring the switching management device about the terminal physical address corresponding to the called subscriber number specified by the terminal device, and the switching management device can check the subscriber numbers of all the terminal devices accommodated in the packet switching system. Converts the incoming subscriber number into a terminal physical address by referring to the all subscriber number table in response to an inquiry from the switching device, and responds to the switching device. It is equipped with a means to do so.

[Effect]

In the packet switching system of this invention.

Furthermore, due to the terminal physical address inquiry and response mechanism between the wedge device and the switching management device, the calling side switching device can know the terminal physical address corresponding to the called subscriber number before sending the connection request packet. Therefore, the connection request packet can be sent directly to the called switching device. Therefore, one calling side father switching device, switching management device.

Communication between called switching equipment consists of two pairs of requests or inquiries and responses.
As a result, it becomes easier to synchronize with each other's communication partners.

〔Example〕

FIG. 1 is a block diagram showing a packet switching system which is an embodiment of the present invention. In the figure, la, l
b and lc are terminal devices, 2a and 2b are switching devices, 3 is a switching management device, and 4 is a ring-shaped trunk line. Each exchange device 21L.

The exchange management device 2b and the exchange management device 3 are configured using a microcomputer, a minicomputer, etc. in addition to a processing device dedicated to exchange. Further, the ring-shaped trunk line 4 is, for example, a coaxial cable, an original fiber, or the like.

FIG. 2 is a block diagram showing a switching device in the packet switching system of FIG. 1. In the figure, 2 is
An exchange device similar to each exchange device 2a, 2b shown in FIG.
5 is a CPU (central processing unit), 6 is a storage device, and 7 is a communication device. The storage device 6 stores various programs and data that are read and processed by the CPU 5, and the communication device 7 has a terminal device 1 and a switching device 2 (not shown).
This is hardware that includes a transmission control device, etc. for transmitting signals between. In the storage device 6, there is an in-office subscriber number table 8. There is an exchange processing unit 9 and the like.

FIG. 3 is a block diagram showing the switching management device in the packet switching system of FIG. 81.

In the figure, 3 is equivalent to the exchange management device shown in FIG. 1, 10 is a CPU, 11 is a storage device, and 12 is a communication device. In the storage device 11, there is a total subscriber number table 13. There is also a conversion management processing unit 14 and the like.

Figure 4 shows the 74-butt exchange system shown in Figure 1.
Transmitted through trunk lines. FIG. 4 is a format diagram showing a 4-bit format. In the figure, 15 is a destination physical address field, 16 is a source physical address field, 17 is a header field, and 18 is an additional data field. The packet header field 17 contains the type of the packet, for example, a connection request, whether it is a J Kerat or 1.
Information such as a code indicating the type of inquiry packet and called subscriber number is entered.

FIG. 5 is a diagram showing the stored contents of the intra-office subscriber number table in the switching device of FIG. 2. In the figure, 81 is the physical address of the switching device, 82 is the number of terminal devices connected to the switching device, 83 is the subscriber number, and 84 is the terminal device accommodation that indicates the housing position of the terminal device 1 in the terminal device. Each location physical address exists in the intra-office subscriber number table 8. In the example shown in FIG. 5, for [1] to (m) of the subscriber numbers 83 of the terminal devices connected to the exchange device 2, [1] to (m) of the corresponding terminal device accommodation location physical addresses 84 are used. ] to (m) are provided.

FIG. 6 is a diagram showing the stored contents of the all subscriber number table in the exchange management device of FIG. 3. In the figure, 13
1 is the physical address of the exchange management device, 132 is the first
The total number of terminal devices in the packet switching system shown in the figure is 13.
3 is the physical address of the switching device to which the terminal device 1 is connected, and 134 is the physical address of the terminal device storage location indicating the storage location of the terminal bag fil in the switching device, and each of them exists in the all subscriber number table 13. do. In the example shown in FIG. 6, for the personal numbers [1] to [n]K, the corresponding terminal physical address is the physical address 13 of the switching device to which the terminal device is connected.
3 [1] to [n], and terminal device accommodation location physical addresses 134 [1] to (n) indicating the accommodation location of the terminal device in the exchange device.

FIG. 7 is a diagram showing an example of a sequence of signals and packets between the terminal device, the switching device, and the switching management device in the packet switching system of FIG. 1.

In this example, the terminal device 1a connected to the exchange device 2a
shows the sequence of signals and packets between the terminal devices 1a and lb, the switching devices 2a and 2b, and the switching management device 3 when a connection is requested to the terminal device 1b connected to the switching device 2b. ing. In the figure, 19 is a connection request signal.

20 is an inquiry packet, 21 is an inquiry response, J
Kerato, 22 is a connection request, Kerato, 23 is an incoming call signal,
24 is an incoming call response signal, 25 is a connection response packet, and 26 is a connection response signal.

Next, the operation of the above-described packet switching system of the present invention will be explained with reference to FIGS. 1 to 7. Now, when the wedge device 2a receives the connection request signal 19 from the terminal device 1a, the wedge device 2a also refers to the local subscriber number table 8 in its own switching device and receives the connection request signal 19 indicated in the connection request signal 19. It is checked whether there is a subscriber number 83 in the in-office subscriber number table 8 that matches the called subscriber number. In this case, when there is no matching subscriber number in the intra-office subscriber number table 8, the switching device 2& transmits a terminal physical address inquiry packet 2G to the switching management device 3. This inquiry bucket) 20
The exchange management device 3 refers to the all-subscriber number table 13 and uses the called subscriber number shown in the inquiry packet 20 as the physical address of the exchange device to which the terminal device is connected. Then, it is converted into a terminal physical address consisting of a physical address indicating the accommodation position of the terminal device in the wedge device, and an inquiry response/ξ packet 21 containing the terminal physical address is returned to the exchange device 21. The switching device 2 & inputs the terminal physical address indicated in the inquiry response packet 21 into the destination physical address field 15.
The connection request packet 22 set to . The exchange device 2b that received this connection request/zokerato 22 knows from the destination physical address field 15 in the connection request packet 22 that the connection request is addressed to the terminal device lb.

An incoming call signal 23 is transmitted to the terminal device 1b.

From now on, first, the terminal device 1b sends an incoming call response signal 241 to the switching device 2bK, and then the switching device 2b sends a call response signal 241 to the switching device 2bK.
connection response packet 25 to a, and finally switching device 2
Each response signal or packet is transmitted from a to the terminal device 1a in the order of connection response signal 26, and thereby
Communication between the terminal device 1a and the terminal device 1b becomes possible. In addition, in the above-mentioned sequence, each exchange device 2a
.

2b and the switching management device 3 are all performed using the trunk line 4 shown in FIG.

Further, when the switching device 2 & which received the connection request signal 19 refers to the in-office subscriber number table 8, the connection request signal 19
If a subscriber number that matches the called subscriber number shown in the subscriber number 83 in the in-office subscriber number table 8 exists, the terminal device that is the target of the connection request is Since it is directly connected to the exchange device 2a,
The switching device 2a directly sends the incoming call signal 2 to the terminal device.
Send 3.

〔Effect of the invention〕

As described above, the present invention provides a packet switching system that includes a plurality of switching devices connected to trunk lines, a switching management device, and a plurality of terminal devices connected to the switching devices. and the exchange management device to query the physical address of the terminal corresponding to the incoming subscriber number,
Since the communication between the exchange device and the exchange management device is partially completed as a communication between two parties that is easy to synchronize with the communication partner,
This has the advantageous effect of providing a packet switching system in which a subscriber number that does not depend on the physical location of a terminal device can be used and the switching system can be easily controlled even during f@ integration.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a socket switching system which is an embodiment of the present invention, FIG. 2 is a block diagram showing a switching device in the packet switching system of FIG. 1, and FIG. FIG. 4 is a block configuration diagram showing the switching management device in the packet switching system shown in FIG. FIG. 2 is a diagram showing the stored contents of the intra-office subscriber number table in the switching equipment, FIG. 6 is a diagram showing the stored contents of the all subscriber number table in the management device of FIG. FIG. 1 is a diagram showing an example of a signal and nozokerato sequence between a terminal device, a switching device, and a switching management device in the packet switching system shown in FIG. 1; FIG. 8 is a block configuration diagram showing an example of a conventional switching system; FIG. 9 9 is a diagram showing an example of a sequence of signals and packets between the terminal device, the wedge device, and the switching management device in the switching system of FIG. 8. FIG. In the figure, 1 e 1 a p 1 b * 1 c
...Terminal device, 2.2L, 2b... Exchange device, 3.
...Return management device, 4... Trunk line, 5, 10...C
PU (central processing unit). 6.11...Storage device, 7.12...Communication device, 8
...Internal subscriber number table, 81,133...Physical address of switching device, 82...Number of terminal devices, 83.
...Subscriber number, 84.134...Physical address of terminal device housing location, 9...Exchange processing unit, 13...All subscriber number table, 131...Physical address of exchange management device, 132. ...Total number of terminal devices, 14... Exchange management processing unit. 15... Destination physical address field, 16... Source physical address field, 17... Packet header field, 18... Additional data field, 19
゜27... Connection request signal, 20... Inquiry packet, 21... Inquiry response packet, 22, 2
8, 29... Connection request packet, 23, 30... Incoming call signal, 24°31... Incoming call response signal, 25.32.
. . . connection response bucket), 26. 33 . . . connection response signal. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] In a packet switching system consisting of a plurality of switching devices and a switching management device connected to a trunk line, and a plurality of terminal devices connected to the switching device, the terminal device is a subscriber that does not depend on its physical location. The terminal physical address, which is assigned a number and indicates the physical location, is the physical address of the switching device to which the terminal device is connected, and the physical address indicating the accommodation position of the terminal device within the switching device. The switching management device includes a total subscriber number table showing the correspondence between the subscriber numbers and the terminal physical addresses for all the terminal devices accommodated in the packet switching system, and a and means for converting the subscriber number into the terminal physical address by referring to the all subscriber number table and responding to the switching device in response to the inquiry, and the switching device For all the terminal devices connected to the device, an intra-office subscriber number indicating the correspondence between the subscriber number assigned to that terminal device and the physical address indicating the accommodation position of the terminal device in the switching device. table and the called subscriber number designated by the terminal device, and refers to the intra-office subscriber number table, and if the called subscriber number exists in the intra-office subscriber number table, the incoming call is means for converting a subscriber number into the physical address of the terminal for exchange connection; and, if the incoming subscriber number does not exist in the in-office subscriber number table, connecting the subscriber number to the exchange management device using the trunk line; An inquiry is made, and the switching management device sends the relay to the switching device to which the terminal device is connected, according to the terminal physical address converted from the called subscriber number using the all-subscriber number table. means for transmitting a connection request packet including the terminal physical address using a line, and means for performing an exchange connection according to the terminal physical address included in the connection request packet received from the trunk line. A packet switching system characterized by: