JPS62248339A - Packet switching system - Google Patents

Abstract

PURPOSE:To enable respective exchange device to perform a connection with an incoming call terminal equipment without being conscious of whether the connection should be performed through a communication processor or not, by providing an inquiry and a responding mechanisms between an switching managing device, and the switching device or the communication processor. CONSTITUTION:When a switching device 2a receives a connection request signal from a terminal equipment 1a, the device 2a refers a station subscriber table 8, and when a corresponding subscriber number is not present, it transmits an inquiry packet in which the subscriber number of an outgoing call terminal equipment is set at an additional data field, to a switching managing device 3. The device 3 receiving the inquiry packet (I)22 refers all subscirber table 13, and returns an inquiry responding packet including a corresponding communication processing address in the additional data field, to the device 2a. Consequently, a centralized processing can be performed at the switching managing device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a packet processing system consisting of a plurality of switching devices and a switching management device connected to a trunk line, and a plurality of terminals connected to the switching IT. It relates to an improved system in an exchange system.

[Conventional technology]

Regarding the improvement of the packet switching system as mentioned above,
The applicant for the invention of this application previously filed a patent application filed in 1986-59.
The proposal was made as No. 238. FIG. 9 is a block diagram showing an example of a conventional switching system. In the figure,
la, lb, 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.

In addition, FIG. 10 shows the signals and ξ
FIG. 3 is a diagram showing an example of a kerato sequence.

This example shows a sequence of signals and packets when the terminal device 1a connected to the switching device 1lt2a requests connection to the terminal device 1b connected to the switching device 1i2b. Figure J (1-21 is a connection request signal, 31 is an inquiry packet, 32 is an inquiry response packet, 24 is a connection request packet, 27 is an incoming call signal, 28 is an incoming call response signal, 29 is a connection response packet) ,3o
is the connection response signal.

Next, the sequence example shown in FIG. 10 above will be explained. First, the switching device It2a, which has received the connection response signal 21 from the terminal device 1a, 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, when it is determined that the subscriber is accommodated within its own station, the switching device 2a transmits an inquiry packet 31 containing the called subscriber number to the switching management device 3. The exchange management device 3 that receives this inquiry packet 31 converts the called subscriber number into a terminal physical address by referring to the table in the exchange management device 3, and responds with an inquiry response 2ξ in which the terminal physical address is set. 32 to exchange device i 2 a. Exchange-i! that received this inquiry response packet 32! 2a sends a connection request packet 24 with the terminal physical address as the destination.
Send. The switching device 2b that received this connection request packet 24 knows from the terminal physical address shown in the packet that the connection request is addressed to the terminal device 1b, and sends an incoming call signal 27 to the terminal device [1b]. do. From then on, first, an incoming call response signal 28 is sent from the terminal device 1b to the switching device 2b, then a connection response packet 29 is sent from the switching device 2b to the switching device 2a, and finally, a call response signal 28 is sent from the terminal device 1b to the switching device 2a. Each response signal or packet is transmitted to 1a in the order of connection response signal 30, and communication between terminal device 1a and terminal device 1b becomes possible.

[Problem that the invention seeks to solve]

The conventional packet switching system described above is configured as described above, so the physical address of the called terminal is set in the inquiry response packet to the inquiry packet from the calling side switching equipment. . However, when connecting a calling terminal device via a communication processing device t8 that realizes a communication service by processing received data packets and transmitting the packets to a set destination, Information on the physical address of the communication processing device selected from the attribute information of the call terminal device is required.

When attempting to obtain this physical address from the calling side exchange equipment, there is a problem that each exchange GE must have attribute information of all terminals FE. This invention solves this problem. This was done to solve the problem of exchange management without requiring each exchange device to have attribute information of all terminal devices. The purpose of this paper is to describe a packet switching system managed by A11t, in which this switching management device instructs each switching device which communication processing device it should go through.

[Means for solving problems]

In the packet switching system according to the present invention, the switching device includes:
When the terminal device receives a connection request signal, the communication processing device includes a means for inquiring the physical address of the transfer destination of the connection request packet to the exchange management device, and the communication processing device receives the destination specified in the received connection request packet. The switching management-1At is equipped with a means for inquiring the physical address of the terminal corresponding to the call subscriber number to the switching management device, and the switching management-1At inquires of all the terminals accommodated in the packet switching system in response to the inquiry from the switching device. , it maintains a table of all subscribers showing the correspondence between subscriber numbers, terminal physical addresses, and terminal attribute identifiers indicating their attributes, and also maintains a table of all subscribers showing the correspondence between subscriber numbers, terminal physical addresses, and terminal attribute identifiers indicating their attributes, and between terminal devices having two types of terminal attribute identifiers and respective terminal attribute identifiers. It maintains a communication processing table that shows the correspondence with respect to the communication physical address that indicates the physical location of the communication processing device that needs to go through when connecting, and responds to inquiries from switching devices by all subscribers. Refer to the communication processing table and the communication processing table to determine whether or not it is necessary to go through a communication processing device. If necessary, obtain the physical address of the communication processing device, and if not necessary, receive the call. It is equipped with a means for determining the corresponding terminal physical address from the subscriber number and responding to the switching equipment with one of the physical addresses, and furthermore, in response to inquiries from the communication processing IT, it refers to the all subscriber table and It is provided with means for determining the corresponding terminal physical address from the call subscriber number and responding to the communication processes f and d.

[Effect]

In the packet switching system of the present invention, an inquiry and response mechanism is provided between the switching management device and the switching device or the communication processing device as follows. Communication processing f! Therefore, it is possible to centrally perform processing in the switching management device, such as determining whether or not the call should go through the communication processing device based on the attributes of the calling/receiving terminal device, and deriving the communication processing address. can.

〔Example〕

FIG. 1 is a block diagram showing a packet switching system which is an embodiment of the present invention. In the figure, la,
lb and lc are terminal devices, 2a and 2b are switching devices, 3 is a switching management device, 20 is a communication processing device, and 4
is a ring-shaped trunk line. Each exchange device t2 a,
2b and the exchange management device 3 are configured using a processing device dedicated to exchange, as well as a microcomputer, a minicomputer, etc. Further, the ring-shaped trunk line 4 is, for example, a coaxial cable, an optical 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 @1 figure,
5 is a CPU (central processing unit), 6 is a storage device, and 7 is a communication device. Programs and data in the storage device 6 are stored, and the communication device 7 is hardware including a transmission-side #device for transmitting signals between the terminal device 1 and the exchange device 2 (not shown). In the storage device 6, there is an in-office subscriber table 8. There is an exchange processing unit 92 communication processing table 19, etc.

FIG. 3 is a block diagram showing the exchange management device in the Nomiget exchange system of FIG. 1.

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. All subscribers table 1 is stored in the storage device 11.
3. There is an exchange management processing unit 141, a communication processing table 19, etc.

FIG. 4 is a format diagram showing the format of a packet transmitted over a trunk line in the packet switching system of FIG. 1. In the figure, 15 is a destination physical address field, 16 is a source physical address field, 17 is a packet header field, and 18 is an additional data field. Paketsu Ken Hetsu 17 Soul 1. 17Ft size - Contains information such as a code indicating the type of packet, for example, whether it is a connection request packet or an inquiry packet.

FIG. 5 is a diagram showing the stored contents of the intra-office subscriber table in the switching device of FIG. 2. In the figure, 81 is the physical address of the exchange device, 82 is the number of terminal devices connected to the exchange g7cwt, 83 is the subscriber number, and 84 is the terminal device indicating the accommodation position of the terminal device 1 in the exchange geUt. The accommodating location physical address 85 is a terminal attribute identifier indicating the attribute of the terminal device 1, and each exists in the in-office subscriber table 8. In the example shown in FIG. 5, for the subscriber numbers 83 [1] to (m) of the terminal fCffi connected to the switching device t2, the corresponding terminal device accommodation location physical address 84 is (1). ) ~ [
m] and the terminal attribute identifier 85 (P(1)) ~(P(n
i) is provided.

FIG. 6 is a diagram showing the stored contents of the all-subscriber table in the exchange management device of FIG. 3. In the figure, 131 is the physical address of the switching management g7c1t, and 132 is the physical address of all terminals gclJI in the packet switching system shown in FIG.
The number L, 133 is the physical address of the switching device to which the terminal device 1 is connected, and 134 is the terminal device 1 in the switching device.
Terminal device accommodation location physical address indicating the accommodation location of 13
5 is a terminal attribute identifier indicating the attribute of the terminal device l, each of which exists in the all subscriber table 13. 6th
In the example shown in the figure, for subscriber numbers [1] to (n), the corresponding terminal physical address is 1, which is the physical address 1 of the switching device to which the terminal device is connected.
33 [1] to [n], (1) to (n) of the terminal device accommodation location physical address 134 indicating the accommodation location of the terminal device in the exchange equipment, and the CP ( 1) ) ~(P(nl)) are provided.

FIG. 7 is a diagram showing the stored contents of the communication processing table in FIGS. 2 and 3. FIG. In the figure, 191 is the terminal attribute identifier of the calling terminal Vi:a, 192 is the terminal attribute identifier of the called terminal device, and 194 is the physical location of the communication processing device required when connecting the above terminal devices. The communication processing address 193 indicates the communication processing f! These are processing flags that identify whether or not it is necessary to go through the communication processing table 19. In the example shown in FIG. 7, for the terminal attribute identifiers [1] to (r) of the calling/receiving terminal bag d, the corresponding processing flags 193 are (Ftl) to (F(r)). and communication processing addresses 194 [1] to (r) are provided.

FIG. 8 is a diagram showing an example of the sequence of signals and packets among the terminal device, the exchange back, the exchange/User management device, and the communication processing device in the packet switching system of FIG. 1.

In this example, the terminal tj t connected to the switching device 2a
1 a is the terminal device 1 connected to the exchange device 2 b
When a connection is requested to terminal device b, each terminal device la and lb, exchange IL [t2a and 2b, exchange management device 3. The sequence of signals and packets between communication processing devices 20 is shown. In FIG. 1, 21 is a connection request signal, 22 is an inquiry packet (Il), 23 is an inquiry response packet (1), 24 is a connection request packet, 25 is an inquiry packet (IN), and 26 is an inquiry response. Packet (IIl,
27 is an incoming call signal, 28 is an incoming call response signal, 29 is a connection response packet, and 30 is a connection response signal.

Next, the operation of the packet switching system of the present invention described above will be explained with reference to FIGS. 111 to 88. Now, the replacement device d2m receives the connection request signal 2 from the terminal device 1a.
1, the switching device 2a refers to the internal subscriber table 8 in its own switching device and sends the ff1ii connection request signal 21.
It is checked whether there is a subscriber number 83 in the intra-office subscriber table 8 that matches the called subscriber number shown therein. In this case, when there is no matching subscriber number in the in-office subscriber table 8, exchange! 112a
sends an inquiry packet I1) 22 in which the subscriber number of the calling terminal device is set in the additional data field 18 to the switching management device f13. The exchange management device 3 that received this inquiry/zokerato (1) 22 refers to the user table 13% and uses the called subscriber number shown in the inquiry packet (1) 22 and the originating subscriber number. Compare the corresponding terminal attribute identifiers with the calling subscriber numbers, and if they do not match, refer to the communication processing table 19 using the respective terminal attribute identifiers corresponding to the calling and receiving subscriber numbers as keys, and perform the corresponding processing. Get the flag and communication processing address. If the processing flag is ON, an inquiry response packet (1) 23 containing the corresponding communication processing address in the additional data field 18 is returned to the exchange fc-J 12a. In addition, if the terminal attribute identifiers corresponding to the called subscriber number and the calling subscriber number match, or if the above processing flag is OFF, the all subscriber table 13 is referred to and the called subscriber number is An inquiry response packet f1) 23 is returned to the switching device TiLza, in which the terminal physical address consisting of the physical address of the switching device corresponding to the user number and the physical address of the terminal device housing location is set in the additional data field 18. The switching device 21L inputs the physical address shown in the inquiry response packet (1) 23 into the destination physical address field 1.
+M vc'11 request packet 24 set to 5 is transmitted. The communication processing device 20 that has received this connection request packet 24 transmits an inquiry packet (ID125) with the called subscriber number set in the additional data field 18 to the switching management device i13.
) 25, the exchange management device 3 updates the all subscriber table 13.
With reference to the inquiry packet (ID 25), the called subscriber number shown in The inquiry response packet (ID26) containing the physical address of the terminal is converted to the terminal physical address consisting of the physical address indicating the terminal physical address, and is returned to the communication processing unit [20.
(I1) Send a connection request packet 24 with the terminal physical address shown in 26 set in the destination physical address field 15. The switching device 2b that received this connection request packet 24 knows from the destination physical address field 15 in the connection request packet 24 that the connection request is addressed to the terminal device lb, and sends an incoming call signal 27 to the terminal device 1b.
Send. From now on, first, the terminal device 1b sends an incoming call response signal 28 to the switching device 2b, then the switching device 2b sends a connection response packet 29 to the communication processing device 20, and then the communication processing device 20 sends a call response signal 28 to the switching device. [12a, the connection response packet 29 is transmitted, and finally, the switching device 2a transmits each response signal or /zokerat to the terminal device 1a in the order of the connection response signal 30.
Communication between the terminal device 1b and the terminal device 1b becomes possible. In the above-described sequence, the transmission of various packets between the switching devices 2m and 2b, the switching management device [3, and the communication processing device 20] is all performed using the trunk line 4 in FIG. 1.

Further, the switching equipment 2a that received the connection request signal 21 refers to the in-office subscriber table 8, and at 9 o'clock, the subscriber number matching the called subscriber number indicated in the connection request signal 21 is found.
If the subscriber number 83 in the in-station subscriber table B is hidden, the terminal attribute identifiers corresponding to the incoming subscriber number and the calling subscriber number are compared, and if they do not match. refers to the communication processing table 19 using each terminal attribute identifier corresponding to the calling/receiving subscriber number as a key, and obtains the corresponding processing flag and communication processing address.If the processing flag is ON, the corresponding A connection request packet 248 with the communication processing address set in the destination physical address field 15 is transmitted.Furthermore, if the terminal attribute identifiers corresponding to the called subscriber number and the calling subscriber number match, or the above processing flag When is OFF, the terminal device that is the target of the connection request is directly connected to the switching device, and therefore the switching device 2& directly transmits the incoming signal to the terminal device.

In the above embodiment, in order to obtain the terminal attribute identifier of the calling terminal device, the switching management device 3 sends an inquiry packet.
(1) The all subscriber table 13 is referred to using the calling subscriber number set in 22 as a key, but the inquiry packet t1) contains the calling terminal device number instead of the calling subscriber number in 22. A terminal attribute identifier may also be set.

〔Effect of the invention〕

As explained above, the present invention provides a packet switching system comprising a plurality of switching devices connected to a trunk line, a communication processing device, a switching management device, and a plurality of terminal devices connected to the switching device. An inquiry and response mechanism is provided between the exchange management device and the exchange device or communication processing device, and the exchange management device specifies the forwarding destination of the connection request packet to the exchange device and communication processing device. The switching device has the excellent effect of being able to connect with a called terminal device without being conscious of whether or not to perform fc contact via a communication processing device.

[Brief explanation of drawings]

FIG. 1 is a block configuration diagram showing a packet switching system which is an embodiment of the present invention, FIG. 2 is a block configuration diagram showing a switching device in the packet switching system of FIG. 1,
3 is a block configuration diagram showing a switching management device in the packet switching system of FIG. 1; FIG. 4 is a format diagram showing the format of a packet transmitted to a trunk line in the packet switching system of FIG. 1; 5 is a diagram showing the stored contents of the internal subscriber table in the switching device of FIG. 2, FIG. 6 is a diagram showing the stored contents of the all subscriber table in the switching management device of FIG. 3, and FIG. is a diagram showing the contents of the communication processing table in the second recitation and in FIG. 3,
FIG. 8 shows a terminal device and a switching device in the packet switching system of FIG. 1. A diagram showing an example of a sequence of signals and packets between the exchange management Vc1it and a communication processing device, FIG. 9 is a block configuration diagram showing an example of a conventional exchange system, and FIG. 10 is a terminal in the exchange system of FIG. signals between the device, the switching device and the switching management device 1; FIG. 3 is a diagram showing an example of a kerato sequence. In the figure, 1. la, lb, lc...terminal device, 2
．． 2a, 2b...exchange device, 3...exchange processing device,
4... Trunk line, 5, 10... CPU (Central Processing Unit) %6.11... Storage device, 7, 12... Communication device, 8... In-office subscriber table, 81.133 ...Physical address of the exchange device, 82...Terminal! ! Number, 83・
...ha resident number 84,134...terminal device accommodation location physical address, 85,135...terminal attribute identifier,
9... Exchange 'processing unit, 13... All subscriber 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...
Communication processing table, 191... Terminal attribute identifier of calling side terminal device, 192... Terminal attribute identifier of called side terminal device, 193... Processing flag, 194... Communication processing address, 20...・Communication processing 4&place, 21... Connection request signal, 22... Inquiry packet X1), 23...
- Inquiry response, (Kerat III, 24... Connection request, e-Kerat, 25... Inquiry packet 4, 26-...
- Inquiry response fusogen l' (ID, 27... Incoming call signal, 28... Incoming call response signal, 29... Connection response packet, 30... Connection response signal, 31... Inquiry packet , 32... Inquiry response packet. In each figure, the same reference numerals indicate the same or complementary parts.

Claims (1)

[Scope of Claims] A packet switching system comprising a plurality of switching devices connected to a trunk line, a communication processing device, a switching management device, and a plurality of terminal devices connected to the switching device, comprising: It is assumed that the terminal device is assigned a subscriber number independent of its physical location, and the communication processing device is configured to:
The received packet shall be subjected to specific processing and sent to a designated destination, and the switching management device shall store the subscriber number and information for all the terminal devices accommodated in the packet switching system. The terminal attribute identifier of the calling terminal device that maintains a table of all subscribers indicating the correspondence between the terminal physical address indicating the physical location and the terminal attribute identifier indicating the attribute of the terminal device, and transmitting the connection request signal. , the terminal attribute identifier of the called terminal device corresponding to the called subscriber number specified in the connection request signal, and the terminal attribute identifier of the called terminal device that is used when connecting the calling terminal device and the called terminal device A communication processing table showing the correspondence with a communication processing address indicating the physical location of the communication processing device is maintained, and the switching device that receives the connection request signal from the terminal device sends an inquiry packet (1). to inquire of the communication processing address to the exchange management device using , and in response, the exchange management device refers to the all subscriber table and the communication processing table to derive the corresponding communication processing address, a first response means that uses the inquiry response packet (1) and responds with the communication processing address;
a first transmitting means for causing the switching device to transmit a connection request packet to the communication processing address as a destination in response to the first response means; Inquiring the physical address of the called terminal device to the switching management device using an inquiry packet (III);
Accordingly, the switching management device refers to the all subscriber table, derives the physical address of the corresponding called terminal device, and uses an inquiry response packet (II) to specify the physical address of the first device to respond to. and second transmitting means for causing the communication processing device to transmit the connection request packet to the physical address of the called terminal device in response to the second response means. A packet switching system characterized by: